Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Kernel-based Virtual Machine driver for Linux |
| 3 | * |
| 4 | * This module enables machines with Intel VT-x extensions to run virtual |
| 5 | * machines without emulation or binary translation. |
| 6 | * |
| 7 | * Copyright (C) 2006 Qumranet, Inc. |
Nicolas Kaiser | 9611c18 | 2010-10-06 14:23:22 +0200 | [diff] [blame] | 8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 9 | * |
| 10 | * Authors: |
| 11 | * Avi Kivity <avi@qumranet.com> |
| 12 | * Yaniv Kamay <yaniv@qumranet.com> |
| 13 | * |
| 14 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 15 | * the COPYING file in the top-level directory. |
| 16 | * |
| 17 | */ |
| 18 | |
Andre Przywara | af669ac | 2015-03-26 14:39:29 +0000 | [diff] [blame] | 19 | #include <kvm/iodev.h> |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 20 | |
Avi Kivity | edf8841 | 2007-12-16 11:02:48 +0200 | [diff] [blame] | 21 | #include <linux/kvm_host.h> |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 22 | #include <linux/kvm.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/errno.h> |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 25 | #include <linux/percpu.h> |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 26 | #include <linux/mm.h> |
| 27 | #include <linux/miscdevice.h> |
| 28 | #include <linux/vmalloc.h> |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 29 | #include <linux/reboot.h> |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 30 | #include <linux/debugfs.h> |
| 31 | #include <linux/highmem.h> |
| 32 | #include <linux/file.h> |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 33 | #include <linux/syscore_ops.h> |
Avi Kivity | 774c47f | 2007-02-12 00:54:47 -0800 | [diff] [blame] | 34 | #include <linux/cpu.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 35 | #include <linux/sched.h> |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 36 | #include <linux/cpumask.h> |
| 37 | #include <linux/smp.h> |
Avi Kivity | d6d2816 | 2007-06-28 08:38:16 -0400 | [diff] [blame] | 38 | #include <linux/anon_inodes.h> |
Avi Kivity | 04d2cc7 | 2007-09-10 18:10:54 +0300 | [diff] [blame] | 39 | #include <linux/profile.h> |
Anthony Liguori | 7aa81cc | 2007-09-17 14:57:50 -0500 | [diff] [blame] | 40 | #include <linux/kvm_para.h> |
Izik Eidus | 6fc138d | 2007-10-09 19:20:39 +0200 | [diff] [blame] | 41 | #include <linux/pagemap.h> |
Anthony Liguori | 8d4e128 | 2007-10-18 09:59:34 -0500 | [diff] [blame] | 42 | #include <linux/mman.h> |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 43 | #include <linux/swap.h> |
Sheng Yang | e56d532 | 2009-03-12 21:45:39 +0800 | [diff] [blame] | 44 | #include <linux/bitops.h> |
Marcelo Tosatti | 547de29 | 2009-05-07 17:55:13 -0300 | [diff] [blame] | 45 | #include <linux/spinlock.h> |
Arnd Bergmann | 6ff5894 | 2009-10-22 14:19:27 +0200 | [diff] [blame] | 46 | #include <linux/compat.h> |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 47 | #include <linux/srcu.h> |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 48 | #include <linux/hugetlb.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 49 | #include <linux/slab.h> |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 50 | #include <linux/sort.h> |
| 51 | #include <linux/bsearch.h> |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 52 | |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 53 | #include <asm/processor.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 54 | #include <asm/io.h> |
David Matlack | 2ea75be | 2014-09-19 16:03:25 -0700 | [diff] [blame] | 55 | #include <asm/ioctl.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 56 | #include <asm/uaccess.h> |
Izik Eidus | 3e021bf | 2007-11-19 11:16:57 +0200 | [diff] [blame] | 57 | #include <asm/pgtable.h> |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 58 | |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 59 | #include "coalesced_mmio.h" |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 60 | #include "async_pf.h" |
Paolo Bonzini | 3c3c29f | 2014-09-24 13:02:46 +0200 | [diff] [blame] | 61 | #include "vfio.h" |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 62 | |
Marcelo Tosatti | 229456f | 2009-06-17 09:22:14 -0300 | [diff] [blame] | 63 | #define CREATE_TRACE_POINTS |
| 64 | #include <trace/events/kvm.h> |
| 65 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 66 | /* Worst case buffer size needed for holding an integer. */ |
| 67 | #define ITOA_MAX_LEN 12 |
| 68 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 69 | MODULE_AUTHOR("Qumranet"); |
| 70 | MODULE_LICENSE("GPL"); |
| 71 | |
David Hildenbrand | 920552b | 2015-09-18 12:34:53 +0200 | [diff] [blame] | 72 | /* Architectures should define their poll value according to the halt latency */ |
| 73 | static unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 74 | module_param(halt_poll_ns, uint, S_IRUGO | S_IWUSR); |
| 75 | |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 76 | /* Default doubles per-vcpu halt_poll_ns. */ |
| 77 | static unsigned int halt_poll_ns_grow = 2; |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 78 | module_param(halt_poll_ns_grow, uint, S_IRUGO | S_IWUSR); |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 79 | |
| 80 | /* Default resets per-vcpu halt_poll_ns . */ |
| 81 | static unsigned int halt_poll_ns_shrink; |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 82 | module_param(halt_poll_ns_shrink, uint, S_IRUGO | S_IWUSR); |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 83 | |
Marcelo Tosatti | fa40a82 | 2009-06-04 15:08:24 -0300 | [diff] [blame] | 84 | /* |
| 85 | * Ordering of locks: |
| 86 | * |
Xiubo Li | b7d409d | 2015-02-26 14:58:24 +0800 | [diff] [blame] | 87 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
Marcelo Tosatti | fa40a82 | 2009-06-04 15:08:24 -0300 | [diff] [blame] | 88 | */ |
| 89 | |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 90 | DEFINE_SPINLOCK(kvm_lock); |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 91 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 92 | LIST_HEAD(vm_list); |
Avi Kivity | 133de90 | 2007-02-12 00:54:44 -0800 | [diff] [blame] | 93 | |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 94 | static cpumask_var_t cpus_hardware_enabled; |
Xiubo Li | f4fee93 | 2015-02-26 14:58:21 +0800 | [diff] [blame] | 95 | static int kvm_usage_count; |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 96 | static atomic_t hardware_enable_failed; |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 97 | |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 98 | struct kmem_cache *kvm_vcpu_cache; |
| 99 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 100 | |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 101 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
| 102 | |
Hollis Blanchard | 76f7c87 | 2008-04-15 16:05:42 -0500 | [diff] [blame] | 103 | struct dentry *kvm_debugfs_dir; |
Paul Mackerras | e23a808 | 2015-03-28 14:21:01 +1100 | [diff] [blame] | 104 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 105 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 106 | static int kvm_debugfs_num_entries; |
| 107 | static const struct file_operations *stat_fops_per_vm[]; |
| 108 | |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 109 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
| 110 | unsigned long arg); |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 111 | #ifdef CONFIG_KVM_COMPAT |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 112 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, |
| 113 | unsigned long arg); |
| 114 | #endif |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 115 | static int hardware_enable_all(void); |
| 116 | static void hardware_disable_all(void); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 117 | |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 118 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 119 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 120 | static void kvm_release_pfn_dirty(kvm_pfn_t pfn); |
Paolo Bonzini | bc009e4 | 2015-05-26 12:43:41 +0200 | [diff] [blame] | 121 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn); |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 122 | |
Andi Kleen | 5248013 | 2014-02-08 08:51:57 +0100 | [diff] [blame] | 123 | __visible bool kvm_rebooting; |
Avi Kivity | b7c4145 | 2010-12-02 17:52:50 +0200 | [diff] [blame] | 124 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
Avi Kivity | 4ecac3f | 2008-05-13 13:23:38 +0300 | [diff] [blame] | 125 | |
Marcelo Tosatti | 54dee99 | 2009-06-11 12:07:44 -0300 | [diff] [blame] | 126 | static bool largepages_enabled = true; |
| 127 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 128 | bool kvm_is_reserved_pfn(kvm_pfn_t pfn) |
Ben-Ami Yassour | cbff90a | 2008-07-28 19:26:24 +0300 | [diff] [blame] | 129 | { |
Andrea Arcangeli | 11feeb4 | 2013-07-25 03:04:38 +0200 | [diff] [blame] | 130 | if (pfn_valid(pfn)) |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 131 | return PageReserved(pfn_to_page(pfn)); |
Ben-Ami Yassour | cbff90a | 2008-07-28 19:26:24 +0300 | [diff] [blame] | 132 | |
| 133 | return true; |
| 134 | } |
| 135 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 136 | /* |
| 137 | * Switches to specified vcpu, until a matching vcpu_put() |
| 138 | */ |
Michael S. Tsirkin | 9fc7744 | 2012-09-16 11:50:30 +0300 | [diff] [blame] | 139 | int vcpu_load(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 140 | { |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 141 | int cpu; |
| 142 | |
Michael S. Tsirkin | 9fc7744 | 2012-09-16 11:50:30 +0300 | [diff] [blame] | 143 | if (mutex_lock_killable(&vcpu->mutex)) |
| 144 | return -EINTR; |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 145 | cpu = get_cpu(); |
| 146 | preempt_notifier_register(&vcpu->preempt_notifier); |
Carsten Otte | 313a3dc | 2007-10-11 19:16:52 +0200 | [diff] [blame] | 147 | kvm_arch_vcpu_load(vcpu, cpu); |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 148 | put_cpu(); |
Michael S. Tsirkin | 9fc7744 | 2012-09-16 11:50:30 +0300 | [diff] [blame] | 149 | return 0; |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 150 | } |
Jim Mattson | 2f1fe81 | 2016-07-08 15:36:06 -0700 | [diff] [blame] | 151 | EXPORT_SYMBOL_GPL(vcpu_load); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 152 | |
Carsten Otte | 313a3dc | 2007-10-11 19:16:52 +0200 | [diff] [blame] | 153 | void vcpu_put(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 154 | { |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 155 | preempt_disable(); |
Carsten Otte | 313a3dc | 2007-10-11 19:16:52 +0200 | [diff] [blame] | 156 | kvm_arch_vcpu_put(vcpu); |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 157 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
| 158 | preempt_enable(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 159 | mutex_unlock(&vcpu->mutex); |
| 160 | } |
Jim Mattson | 2f1fe81 | 2016-07-08 15:36:06 -0700 | [diff] [blame] | 161 | EXPORT_SYMBOL_GPL(vcpu_put); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 162 | |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 163 | static void ack_flush(void *_completed) |
| 164 | { |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 165 | } |
| 166 | |
Tang Chen | 445b823 | 2014-09-24 15:57:55 +0800 | [diff] [blame] | 167 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 168 | { |
Avi Kivity | 597a5f5 | 2008-07-20 14:24:22 +0300 | [diff] [blame] | 169 | int i, cpu, me; |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 170 | cpumask_var_t cpus; |
| 171 | bool called = true; |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 172 | struct kvm_vcpu *vcpu; |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 173 | |
Li Zefan | 79f5599 | 2009-06-15 14:58:26 +0800 | [diff] [blame] | 174 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 175 | |
Xiao Guangrong | 3cba413 | 2011-01-12 15:41:22 +0800 | [diff] [blame] | 176 | me = get_cpu(); |
Gleb Natapov | 988a2ca | 2009-06-09 15:56:29 +0300 | [diff] [blame] | 177 | kvm_for_each_vcpu(i, vcpu, kvm) { |
Xiao Guangrong | 3cba413 | 2011-01-12 15:41:22 +0800 | [diff] [blame] | 178 | kvm_make_request(req, vcpu); |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 179 | cpu = vcpu->cpu; |
Xiao Guangrong | 6b7e2d0 | 2011-01-12 15:40:31 +0800 | [diff] [blame] | 180 | |
Lan Tianyu | a30a050 | 2016-03-13 11:10:26 +0800 | [diff] [blame] | 181 | /* Set ->requests bit before we read ->mode. */ |
| 182 | smp_mb__after_atomic(); |
Xiao Guangrong | 6b7e2d0 | 2011-01-12 15:40:31 +0800 | [diff] [blame] | 183 | |
| 184 | if (cpus != NULL && cpu != -1 && cpu != me && |
| 185 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 186 | cpumask_set_cpu(cpu, cpus); |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 187 | } |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 188 | if (unlikely(cpus == NULL)) |
| 189 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); |
| 190 | else if (!cpumask_empty(cpus)) |
| 191 | smp_call_function_many(cpus, ack_flush, NULL, 1); |
| 192 | else |
| 193 | called = false; |
Xiao Guangrong | 3cba413 | 2011-01-12 15:41:22 +0800 | [diff] [blame] | 194 | put_cpu(); |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 195 | free_cpumask_var(cpus); |
Rusty Russell | 4984689 | 2008-12-08 20:26:24 +1030 | [diff] [blame] | 196 | return called; |
| 197 | } |
| 198 | |
Mario Smarduch | a6d5101 | 2015-01-15 15:58:52 -0800 | [diff] [blame] | 199 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL |
Rusty Russell | 4984689 | 2008-12-08 20:26:24 +1030 | [diff] [blame] | 200 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
| 201 | { |
Lan Tianyu | 4ae3cb3 | 2016-03-13 11:10:28 +0800 | [diff] [blame] | 202 | /* |
| 203 | * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in |
| 204 | * kvm_make_all_cpus_request. |
| 205 | */ |
| 206 | long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); |
Xiao Guangrong | a086f6a | 2014-04-17 17:06:12 +0800 | [diff] [blame] | 207 | |
Lan Tianyu | 4ae3cb3 | 2016-03-13 11:10:28 +0800 | [diff] [blame] | 208 | /* |
| 209 | * We want to publish modifications to the page tables before reading |
| 210 | * mode. Pairs with a memory barrier in arch-specific code. |
| 211 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest |
| 212 | * and smp_mb in walk_shadow_page_lockless_begin/end. |
| 213 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. |
| 214 | * |
| 215 | * There is already an smp_mb__after_atomic() before |
| 216 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that |
| 217 | * barrier here. |
| 218 | */ |
Tang Chen | 445b823 | 2014-09-24 15:57:55 +0800 | [diff] [blame] | 219 | if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
Rusty Russell | 4984689 | 2008-12-08 20:26:24 +1030 | [diff] [blame] | 220 | ++kvm->stat.remote_tlb_flush; |
Xiao Guangrong | a086f6a | 2014-04-17 17:06:12 +0800 | [diff] [blame] | 221 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 222 | } |
Aneesh Kumar K.V | 2ba9f0d | 2013-10-07 22:17:59 +0530 | [diff] [blame] | 223 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
Mario Smarduch | a6d5101 | 2015-01-15 15:58:52 -0800 | [diff] [blame] | 224 | #endif |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 225 | |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 226 | void kvm_reload_remote_mmus(struct kvm *kvm) |
| 227 | { |
Tang Chen | 445b823 | 2014-09-24 15:57:55 +0800 | [diff] [blame] | 228 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 229 | } |
| 230 | |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 231 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
| 232 | { |
| 233 | struct page *page; |
| 234 | int r; |
| 235 | |
| 236 | mutex_init(&vcpu->mutex); |
| 237 | vcpu->cpu = -1; |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 238 | vcpu->kvm = kvm; |
| 239 | vcpu->vcpu_id = id; |
Rik van Riel | 34bb10b | 2011-02-01 09:52:41 -0500 | [diff] [blame] | 240 | vcpu->pid = NULL; |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 241 | init_swait_queue_head(&vcpu->wq); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 242 | kvm_async_pf_vcpu_init(vcpu); |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 243 | |
Feng Wu | bf9f6ac | 2015-09-18 22:29:55 +0800 | [diff] [blame] | 244 | vcpu->pre_pcpu = -1; |
| 245 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); |
| 246 | |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 247 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
| 248 | if (!page) { |
| 249 | r = -ENOMEM; |
| 250 | goto fail; |
| 251 | } |
| 252 | vcpu->run = page_address(page); |
| 253 | |
Raghavendra K T | 4c08849 | 2012-07-18 19:07:46 +0530 | [diff] [blame] | 254 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
| 255 | kvm_vcpu_set_dy_eligible(vcpu, false); |
Raghavendra K T | 3a08a8f | 2013-03-04 23:32:07 +0530 | [diff] [blame] | 256 | vcpu->preempted = false; |
Raghavendra K T | 4c08849 | 2012-07-18 19:07:46 +0530 | [diff] [blame] | 257 | |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 258 | r = kvm_arch_vcpu_init(vcpu); |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 259 | if (r < 0) |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 260 | goto fail_free_run; |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 261 | return 0; |
| 262 | |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 263 | fail_free_run: |
| 264 | free_page((unsigned long)vcpu->run); |
| 265 | fail: |
Rusty Russell | 76fafa5 | 2007-10-08 10:50:48 +1000 | [diff] [blame] | 266 | return r; |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 267 | } |
| 268 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); |
| 269 | |
| 270 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) |
| 271 | { |
Rik van Riel | 34bb10b | 2011-02-01 09:52:41 -0500 | [diff] [blame] | 272 | put_pid(vcpu->pid); |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 273 | kvm_arch_vcpu_uninit(vcpu); |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 274 | free_page((unsigned long)vcpu->run); |
| 275 | } |
| 276 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); |
| 277 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 278 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
| 279 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) |
| 280 | { |
| 281 | return container_of(mn, struct kvm, mmu_notifier); |
| 282 | } |
| 283 | |
| 284 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, |
| 285 | struct mm_struct *mm, |
| 286 | unsigned long address) |
| 287 | { |
| 288 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 289 | int need_tlb_flush, idx; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 290 | |
| 291 | /* |
| 292 | * When ->invalidate_page runs, the linux pte has been zapped |
| 293 | * already but the page is still allocated until |
| 294 | * ->invalidate_page returns. So if we increase the sequence |
| 295 | * here the kvm page fault will notice if the spte can't be |
| 296 | * established because the page is going to be freed. If |
| 297 | * instead the kvm page fault establishes the spte before |
| 298 | * ->invalidate_page runs, kvm_unmap_hva will release it |
| 299 | * before returning. |
| 300 | * |
| 301 | * The sequence increase only need to be seen at spin_unlock |
| 302 | * time, and not at spin_lock time. |
| 303 | * |
| 304 | * Increasing the sequence after the spin_unlock would be |
| 305 | * unsafe because the kvm page fault could then establish the |
| 306 | * pte after kvm_unmap_hva returned, without noticing the page |
| 307 | * is going to be freed. |
| 308 | */ |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 309 | idx = srcu_read_lock(&kvm->srcu); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 310 | spin_lock(&kvm->mmu_lock); |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 311 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 312 | kvm->mmu_notifier_seq++; |
Xiao Guangrong | a4ee1ca | 2010-11-23 11:13:00 +0800 | [diff] [blame] | 313 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 314 | /* we've to flush the tlb before the pages can be freed */ |
| 315 | if (need_tlb_flush) |
| 316 | kvm_flush_remote_tlbs(kvm); |
| 317 | |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 318 | spin_unlock(&kvm->mmu_lock); |
Tang Chen | fe71557 | 2014-09-24 15:57:57 +0800 | [diff] [blame] | 319 | |
| 320 | kvm_arch_mmu_notifier_invalidate_page(kvm, address); |
| 321 | |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 322 | srcu_read_unlock(&kvm->srcu, idx); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 323 | } |
| 324 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 325 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
| 326 | struct mm_struct *mm, |
| 327 | unsigned long address, |
| 328 | pte_t pte) |
| 329 | { |
| 330 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 331 | int idx; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 332 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 333 | idx = srcu_read_lock(&kvm->srcu); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 334 | spin_lock(&kvm->mmu_lock); |
| 335 | kvm->mmu_notifier_seq++; |
| 336 | kvm_set_spte_hva(kvm, address, pte); |
| 337 | spin_unlock(&kvm->mmu_lock); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 338 | srcu_read_unlock(&kvm->srcu, idx); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 339 | } |
| 340 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 341 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
| 342 | struct mm_struct *mm, |
| 343 | unsigned long start, |
| 344 | unsigned long end) |
| 345 | { |
| 346 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 347 | int need_tlb_flush = 0, idx; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 348 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 349 | idx = srcu_read_lock(&kvm->srcu); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 350 | spin_lock(&kvm->mmu_lock); |
| 351 | /* |
| 352 | * The count increase must become visible at unlock time as no |
| 353 | * spte can be established without taking the mmu_lock and |
| 354 | * count is also read inside the mmu_lock critical section. |
| 355 | */ |
| 356 | kvm->mmu_notifier_count++; |
Takuya Yoshikawa | b3ae209 | 2012-07-02 17:56:33 +0900 | [diff] [blame] | 357 | need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); |
Xiao Guangrong | a4ee1ca | 2010-11-23 11:13:00 +0800 | [diff] [blame] | 358 | need_tlb_flush |= kvm->tlbs_dirty; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 359 | /* we've to flush the tlb before the pages can be freed */ |
| 360 | if (need_tlb_flush) |
| 361 | kvm_flush_remote_tlbs(kvm); |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 362 | |
| 363 | spin_unlock(&kvm->mmu_lock); |
| 364 | srcu_read_unlock(&kvm->srcu, idx); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, |
| 368 | struct mm_struct *mm, |
| 369 | unsigned long start, |
| 370 | unsigned long end) |
| 371 | { |
| 372 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 373 | |
| 374 | spin_lock(&kvm->mmu_lock); |
| 375 | /* |
| 376 | * This sequence increase will notify the kvm page fault that |
| 377 | * the page that is going to be mapped in the spte could have |
| 378 | * been freed. |
| 379 | */ |
| 380 | kvm->mmu_notifier_seq++; |
Paul Mackerras | a355aa5 | 2011-12-12 12:37:21 +0000 | [diff] [blame] | 381 | smp_wmb(); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 382 | /* |
| 383 | * The above sequence increase must be visible before the |
Paul Mackerras | a355aa5 | 2011-12-12 12:37:21 +0000 | [diff] [blame] | 384 | * below count decrease, which is ensured by the smp_wmb above |
| 385 | * in conjunction with the smp_rmb in mmu_notifier_retry(). |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 386 | */ |
| 387 | kvm->mmu_notifier_count--; |
| 388 | spin_unlock(&kvm->mmu_lock); |
| 389 | |
| 390 | BUG_ON(kvm->mmu_notifier_count < 0); |
| 391 | } |
| 392 | |
| 393 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, |
| 394 | struct mm_struct *mm, |
Andres Lagar-Cavilla | 5712846 | 2014-09-22 14:54:42 -0700 | [diff] [blame] | 395 | unsigned long start, |
| 396 | unsigned long end) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 397 | { |
| 398 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 399 | int young, idx; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 400 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 401 | idx = srcu_read_lock(&kvm->srcu); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 402 | spin_lock(&kvm->mmu_lock); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 403 | |
Andres Lagar-Cavilla | 5712846 | 2014-09-22 14:54:42 -0700 | [diff] [blame] | 404 | young = kvm_age_hva(kvm, start, end); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 405 | if (young) |
| 406 | kvm_flush_remote_tlbs(kvm); |
| 407 | |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 408 | spin_unlock(&kvm->mmu_lock); |
| 409 | srcu_read_unlock(&kvm->srcu, idx); |
| 410 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 411 | return young; |
| 412 | } |
| 413 | |
Vladimir Davydov | 1d7715c | 2015-09-09 15:35:41 -0700 | [diff] [blame] | 414 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, |
| 415 | struct mm_struct *mm, |
| 416 | unsigned long start, |
| 417 | unsigned long end) |
| 418 | { |
| 419 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 420 | int young, idx; |
| 421 | |
| 422 | idx = srcu_read_lock(&kvm->srcu); |
| 423 | spin_lock(&kvm->mmu_lock); |
| 424 | /* |
| 425 | * Even though we do not flush TLB, this will still adversely |
| 426 | * affect performance on pre-Haswell Intel EPT, where there is |
| 427 | * no EPT Access Bit to clear so that we have to tear down EPT |
| 428 | * tables instead. If we find this unacceptable, we can always |
| 429 | * add a parameter to kvm_age_hva so that it effectively doesn't |
| 430 | * do anything on clear_young. |
| 431 | * |
| 432 | * Also note that currently we never issue secondary TLB flushes |
| 433 | * from clear_young, leaving this job up to the regular system |
| 434 | * cadence. If we find this inaccurate, we might come up with a |
| 435 | * more sophisticated heuristic later. |
| 436 | */ |
| 437 | young = kvm_age_hva(kvm, start, end); |
| 438 | spin_unlock(&kvm->mmu_lock); |
| 439 | srcu_read_unlock(&kvm->srcu, idx); |
| 440 | |
| 441 | return young; |
| 442 | } |
| 443 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 444 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
| 445 | struct mm_struct *mm, |
| 446 | unsigned long address) |
| 447 | { |
| 448 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 449 | int young, idx; |
| 450 | |
| 451 | idx = srcu_read_lock(&kvm->srcu); |
| 452 | spin_lock(&kvm->mmu_lock); |
| 453 | young = kvm_test_age_hva(kvm, address); |
| 454 | spin_unlock(&kvm->mmu_lock); |
| 455 | srcu_read_unlock(&kvm->srcu, idx); |
| 456 | |
| 457 | return young; |
| 458 | } |
| 459 | |
Marcelo Tosatti | 85db06e | 2008-12-10 21:23:26 +0100 | [diff] [blame] | 460 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
| 461 | struct mm_struct *mm) |
| 462 | { |
| 463 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Lai Jiangshan | eda2bed | 2010-04-20 14:29:29 +0800 | [diff] [blame] | 464 | int idx; |
| 465 | |
| 466 | idx = srcu_read_lock(&kvm->srcu); |
Marcelo Tosatti | 2df72e9 | 2012-08-24 15:54:57 -0300 | [diff] [blame] | 467 | kvm_arch_flush_shadow_all(kvm); |
Lai Jiangshan | eda2bed | 2010-04-20 14:29:29 +0800 | [diff] [blame] | 468 | srcu_read_unlock(&kvm->srcu, idx); |
Marcelo Tosatti | 85db06e | 2008-12-10 21:23:26 +0100 | [diff] [blame] | 469 | } |
| 470 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 471 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
| 472 | .invalidate_page = kvm_mmu_notifier_invalidate_page, |
| 473 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
| 474 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, |
| 475 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, |
Vladimir Davydov | 1d7715c | 2015-09-09 15:35:41 -0700 | [diff] [blame] | 476 | .clear_young = kvm_mmu_notifier_clear_young, |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 477 | .test_young = kvm_mmu_notifier_test_young, |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 478 | .change_pte = kvm_mmu_notifier_change_pte, |
Marcelo Tosatti | 85db06e | 2008-12-10 21:23:26 +0100 | [diff] [blame] | 479 | .release = kvm_mmu_notifier_release, |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 480 | }; |
Avi Kivity | 4c07b0a | 2009-12-20 14:54:04 +0200 | [diff] [blame] | 481 | |
| 482 | static int kvm_init_mmu_notifier(struct kvm *kvm) |
| 483 | { |
| 484 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; |
| 485 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); |
| 486 | } |
| 487 | |
| 488 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ |
| 489 | |
| 490 | static int kvm_init_mmu_notifier(struct kvm *kvm) |
| 491 | { |
| 492 | return 0; |
| 493 | } |
| 494 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 495 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
| 496 | |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 497 | static struct kvm_memslots *kvm_alloc_memslots(void) |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 498 | { |
| 499 | int i; |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 500 | struct kvm_memslots *slots; |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 501 | |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 502 | slots = kvm_kvzalloc(sizeof(struct kvm_memslots)); |
| 503 | if (!slots) |
| 504 | return NULL; |
| 505 | |
| 506 | /* |
| 507 | * Init kvm generation close to the maximum to easily test the |
| 508 | * code of handling generation number wrap-around. |
| 509 | */ |
| 510 | slots->generation = -150; |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 511 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
Xiao Guangrong | f85e2cb | 2011-11-24 17:41:54 +0800 | [diff] [blame] | 512 | slots->id_to_index[i] = slots->memslots[i].id = i; |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 513 | |
| 514 | return slots; |
| 515 | } |
| 516 | |
| 517 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
| 518 | { |
| 519 | if (!memslot->dirty_bitmap) |
| 520 | return; |
| 521 | |
| 522 | kvfree(memslot->dirty_bitmap); |
| 523 | memslot->dirty_bitmap = NULL; |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * Free any memory in @free but not in @dont. |
| 528 | */ |
| 529 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, |
| 530 | struct kvm_memory_slot *dont) |
| 531 | { |
| 532 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) |
| 533 | kvm_destroy_dirty_bitmap(free); |
| 534 | |
| 535 | kvm_arch_free_memslot(kvm, free, dont); |
| 536 | |
| 537 | free->npages = 0; |
| 538 | } |
| 539 | |
| 540 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) |
| 541 | { |
| 542 | struct kvm_memory_slot *memslot; |
| 543 | |
| 544 | if (!slots) |
| 545 | return; |
| 546 | |
| 547 | kvm_for_each_memslot(memslot, slots) |
| 548 | kvm_free_memslot(kvm, memslot, NULL); |
| 549 | |
| 550 | kvfree(slots); |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 551 | } |
| 552 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 553 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) |
| 554 | { |
| 555 | int i; |
| 556 | |
| 557 | if (!kvm->debugfs_dentry) |
| 558 | return; |
| 559 | |
| 560 | debugfs_remove_recursive(kvm->debugfs_dentry); |
| 561 | |
| 562 | for (i = 0; i < kvm_debugfs_num_entries; i++) |
| 563 | kfree(kvm->debugfs_stat_data[i]); |
| 564 | kfree(kvm->debugfs_stat_data); |
| 565 | } |
| 566 | |
| 567 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) |
| 568 | { |
| 569 | char dir_name[ITOA_MAX_LEN * 2]; |
| 570 | struct kvm_stat_data *stat_data; |
| 571 | struct kvm_stats_debugfs_item *p; |
| 572 | |
| 573 | if (!debugfs_initialized()) |
| 574 | return 0; |
| 575 | |
| 576 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); |
| 577 | kvm->debugfs_dentry = debugfs_create_dir(dir_name, |
| 578 | kvm_debugfs_dir); |
| 579 | if (!kvm->debugfs_dentry) |
| 580 | return -ENOMEM; |
| 581 | |
| 582 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, |
| 583 | sizeof(*kvm->debugfs_stat_data), |
| 584 | GFP_KERNEL); |
| 585 | if (!kvm->debugfs_stat_data) |
| 586 | return -ENOMEM; |
| 587 | |
| 588 | for (p = debugfs_entries; p->name; p++) { |
| 589 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL); |
| 590 | if (!stat_data) |
| 591 | return -ENOMEM; |
| 592 | |
| 593 | stat_data->kvm = kvm; |
| 594 | stat_data->offset = p->offset; |
| 595 | kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; |
| 596 | if (!debugfs_create_file(p->name, 0444, |
| 597 | kvm->debugfs_dentry, |
| 598 | stat_data, |
| 599 | stat_fops_per_vm[p->kind])) |
| 600 | return -ENOMEM; |
| 601 | } |
| 602 | return 0; |
| 603 | } |
| 604 | |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 605 | static struct kvm *kvm_create_vm(unsigned long type) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 606 | { |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 607 | int r, i; |
| 608 | struct kvm *kvm = kvm_arch_alloc_vm(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 609 | |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 610 | if (!kvm) |
| 611 | return ERR_PTR(-ENOMEM); |
| 612 | |
Paolo Bonzini | e9ad4ec | 2016-03-21 10:15:25 +0100 | [diff] [blame] | 613 | spin_lock_init(&kvm->mmu_lock); |
| 614 | atomic_inc(¤t->mm->mm_count); |
| 615 | kvm->mm = current->mm; |
| 616 | kvm_eventfd_init(kvm); |
| 617 | mutex_init(&kvm->lock); |
| 618 | mutex_init(&kvm->irq_lock); |
| 619 | mutex_init(&kvm->slots_lock); |
| 620 | atomic_set(&kvm->users_count, 1); |
| 621 | INIT_LIST_HEAD(&kvm->devices); |
| 622 | |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 623 | r = kvm_arch_init_vm(kvm, type); |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 624 | if (r) |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 625 | goto out_err_no_disable; |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 626 | |
| 627 | r = hardware_enable_all(); |
| 628 | if (r) |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 629 | goto out_err_no_disable; |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 630 | |
Paolo Bonzini | c77dcac | 2014-08-06 14:24:45 +0200 | [diff] [blame] | 631 | #ifdef CONFIG_HAVE_KVM_IRQFD |
Gleb Natapov | 136bdfe | 2009-08-24 11:54:23 +0300 | [diff] [blame] | 632 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
Avi Kivity | 75858a8 | 2009-01-04 17:10:50 +0200 | [diff] [blame] | 633 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 634 | |
Alex Williamson | 1e702d9 | 2012-12-10 10:33:32 -0700 | [diff] [blame] | 635 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
| 636 | |
Marcelo Tosatti | 46a26bf | 2009-12-23 14:35:16 -0200 | [diff] [blame] | 637 | r = -ENOMEM; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 638 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
| 639 | kvm->memslots[i] = kvm_alloc_memslots(); |
| 640 | if (!kvm->memslots[i]) |
| 641 | goto out_err_no_srcu; |
| 642 | } |
Paolo Bonzini | 00f034a | 2014-08-20 14:29:21 +0200 | [diff] [blame] | 643 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 644 | if (init_srcu_struct(&kvm->srcu)) |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 645 | goto out_err_no_srcu; |
| 646 | if (init_srcu_struct(&kvm->irq_srcu)) |
| 647 | goto out_err_no_irq_srcu; |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 648 | for (i = 0; i < KVM_NR_BUSES; i++) { |
| 649 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), |
| 650 | GFP_KERNEL); |
Jan Kiszka | 57e7fbe | 2010-11-09 12:42:12 +0100 | [diff] [blame] | 651 | if (!kvm->buses[i]) |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 652 | goto out_err; |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 653 | } |
Mike Waychison | 74b5c5b | 2011-06-03 13:04:53 -0700 | [diff] [blame] | 654 | |
Mike Waychison | 74b5c5b | 2011-06-03 13:04:53 -0700 | [diff] [blame] | 655 | r = kvm_init_mmu_notifier(kvm); |
| 656 | if (r) |
| 657 | goto out_err; |
| 658 | |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 659 | spin_lock(&kvm_lock); |
Rusty Russell | 5e58cfe | 2007-07-23 17:08:21 +1000 | [diff] [blame] | 660 | list_add(&kvm->vm_list, &vm_list); |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 661 | spin_unlock(&kvm_lock); |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 662 | |
Peter Zijlstra | 2ecd9d2 | 2015-07-03 18:53:58 +0200 | [diff] [blame] | 663 | preempt_notifier_inc(); |
| 664 | |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 665 | return kvm; |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 666 | |
| 667 | out_err: |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 668 | cleanup_srcu_struct(&kvm->irq_srcu); |
| 669 | out_err_no_irq_srcu: |
Jan Kiszka | 57e7fbe | 2010-11-09 12:42:12 +0100 | [diff] [blame] | 670 | cleanup_srcu_struct(&kvm->srcu); |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 671 | out_err_no_srcu: |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 672 | hardware_disable_all(); |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 673 | out_err_no_disable: |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 674 | for (i = 0; i < KVM_NR_BUSES; i++) |
| 675 | kfree(kvm->buses[i]); |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 676 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
| 677 | kvm_free_memslots(kvm, kvm->memslots[i]); |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 678 | kvm_arch_free_vm(kvm); |
Paolo Bonzini | e9ad4ec | 2016-03-21 10:15:25 +0100 | [diff] [blame] | 679 | mmdrop(current->mm); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 680 | return ERR_PTR(r); |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 681 | } |
| 682 | |
Takuya Yoshikawa | 92eca8f | 2012-05-20 13:13:28 +0900 | [diff] [blame] | 683 | /* |
| 684 | * Avoid using vmalloc for a small buffer. |
| 685 | * Should not be used when the size is statically known. |
| 686 | */ |
Takuya Yoshikawa | c1a7b32 | 2012-05-20 13:15:07 +0900 | [diff] [blame] | 687 | void *kvm_kvzalloc(unsigned long size) |
Takuya Yoshikawa | 92eca8f | 2012-05-20 13:13:28 +0900 | [diff] [blame] | 688 | { |
| 689 | if (size > PAGE_SIZE) |
| 690 | return vzalloc(size); |
| 691 | else |
| 692 | return kzalloc(size, GFP_KERNEL); |
| 693 | } |
| 694 | |
Scott Wood | 07f0a7b | 2013-04-25 14:11:23 +0000 | [diff] [blame] | 695 | static void kvm_destroy_devices(struct kvm *kvm) |
| 696 | { |
Geliang Tang | e6e3b5a | 2016-01-01 19:47:12 +0800 | [diff] [blame] | 697 | struct kvm_device *dev, *tmp; |
Scott Wood | 07f0a7b | 2013-04-25 14:11:23 +0000 | [diff] [blame] | 698 | |
Christoffer Dall | a28ebea | 2016-08-09 19:13:01 +0200 | [diff] [blame] | 699 | /* |
| 700 | * We do not need to take the kvm->lock here, because nobody else |
| 701 | * has a reference to the struct kvm at this point and therefore |
| 702 | * cannot access the devices list anyhow. |
| 703 | */ |
Geliang Tang | e6e3b5a | 2016-01-01 19:47:12 +0800 | [diff] [blame] | 704 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { |
| 705 | list_del(&dev->vm_node); |
Scott Wood | 07f0a7b | 2013-04-25 14:11:23 +0000 | [diff] [blame] | 706 | dev->ops->destroy(dev); |
| 707 | } |
| 708 | } |
| 709 | |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 710 | static void kvm_destroy_vm(struct kvm *kvm) |
| 711 | { |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 712 | int i; |
Avi Kivity | 6d4e4c4 | 2007-11-21 16:41:05 +0200 | [diff] [blame] | 713 | struct mm_struct *mm = kvm->mm; |
| 714 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 715 | kvm_destroy_vm_debugfs(kvm); |
Sheng Yang | ad8ba2c | 2009-01-06 10:03:02 +0800 | [diff] [blame] | 716 | kvm_arch_sync_events(kvm); |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 717 | spin_lock(&kvm_lock); |
Avi Kivity | 133de90 | 2007-02-12 00:54:44 -0800 | [diff] [blame] | 718 | list_del(&kvm->vm_list); |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 719 | spin_unlock(&kvm_lock); |
Avi Kivity | 399ec80 | 2008-11-19 13:58:46 +0200 | [diff] [blame] | 720 | kvm_free_irq_routing(kvm); |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 721 | for (i = 0; i < KVM_NR_BUSES; i++) |
| 722 | kvm_io_bus_destroy(kvm->buses[i]); |
Avi Kivity | 980da6c | 2009-12-20 15:13:43 +0200 | [diff] [blame] | 723 | kvm_coalesced_mmio_free(kvm); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 724 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
| 725 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); |
Gleb Natapov | f00be0c | 2009-03-19 12:20:36 +0200 | [diff] [blame] | 726 | #else |
Marcelo Tosatti | 2df72e9 | 2012-08-24 15:54:57 -0300 | [diff] [blame] | 727 | kvm_arch_flush_shadow_all(kvm); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 728 | #endif |
Zhang Xiantao | d19a9cd | 2007-11-18 18:43:45 +0800 | [diff] [blame] | 729 | kvm_arch_destroy_vm(kvm); |
Scott Wood | 07f0a7b | 2013-04-25 14:11:23 +0000 | [diff] [blame] | 730 | kvm_destroy_devices(kvm); |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 731 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
| 732 | kvm_free_memslots(kvm, kvm->memslots[i]); |
Paolo Bonzini | 820b3fc | 2014-06-03 13:44:17 +0200 | [diff] [blame] | 733 | cleanup_srcu_struct(&kvm->irq_srcu); |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 734 | cleanup_srcu_struct(&kvm->srcu); |
| 735 | kvm_arch_free_vm(kvm); |
Peter Zijlstra | 2ecd9d2 | 2015-07-03 18:53:58 +0200 | [diff] [blame] | 736 | preempt_notifier_dec(); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 737 | hardware_disable_all(); |
Avi Kivity | 6d4e4c4 | 2007-11-21 16:41:05 +0200 | [diff] [blame] | 738 | mmdrop(mm); |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 739 | } |
| 740 | |
Izik Eidus | d39f13b | 2008-03-30 16:01:25 +0300 | [diff] [blame] | 741 | void kvm_get_kvm(struct kvm *kvm) |
| 742 | { |
| 743 | atomic_inc(&kvm->users_count); |
| 744 | } |
| 745 | EXPORT_SYMBOL_GPL(kvm_get_kvm); |
| 746 | |
| 747 | void kvm_put_kvm(struct kvm *kvm) |
| 748 | { |
| 749 | if (atomic_dec_and_test(&kvm->users_count)) |
| 750 | kvm_destroy_vm(kvm); |
| 751 | } |
| 752 | EXPORT_SYMBOL_GPL(kvm_put_kvm); |
| 753 | |
| 754 | |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 755 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
| 756 | { |
| 757 | struct kvm *kvm = filp->private_data; |
| 758 | |
Gregory Haskins | 721eecb | 2009-05-20 10:30:49 -0400 | [diff] [blame] | 759 | kvm_irqfd_release(kvm); |
| 760 | |
Izik Eidus | d39f13b | 2008-03-30 16:01:25 +0300 | [diff] [blame] | 761 | kvm_put_kvm(kvm); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 762 | return 0; |
| 763 | } |
| 764 | |
Takuya Yoshikawa | 515a012 | 2010-10-27 18:23:54 +0900 | [diff] [blame] | 765 | /* |
| 766 | * Allocation size is twice as large as the actual dirty bitmap size. |
Takuya Yoshikawa | 93474b2 | 2012-03-01 19:34:45 +0900 | [diff] [blame] | 767 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
Takuya Yoshikawa | 515a012 | 2010-10-27 18:23:54 +0900 | [diff] [blame] | 768 | */ |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 769 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
| 770 | { |
Takuya Yoshikawa | 515a012 | 2010-10-27 18:23:54 +0900 | [diff] [blame] | 771 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 772 | |
Takuya Yoshikawa | 92eca8f | 2012-05-20 13:13:28 +0900 | [diff] [blame] | 773 | memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes); |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 774 | if (!memslot->dirty_bitmap) |
| 775 | return -ENOMEM; |
| 776 | |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 777 | return 0; |
| 778 | } |
| 779 | |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 780 | /* |
Igor Mammedov | 0e60b07 | 2014-12-01 17:29:26 +0000 | [diff] [blame] | 781 | * Insert memslot and re-sort memslots based on their GFN, |
| 782 | * so binary search could be used to lookup GFN. |
| 783 | * Sorting algorithm takes advantage of having initially |
| 784 | * sorted array and known changed memslot position. |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 785 | */ |
Paolo Bonzini | 5cc1502 | 2014-11-14 10:55:31 +0100 | [diff] [blame] | 786 | static void update_memslots(struct kvm_memslots *slots, |
| 787 | struct kvm_memory_slot *new) |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 788 | { |
Paolo Bonzini | 8593176c | 2014-11-14 10:22:07 +0100 | [diff] [blame] | 789 | int id = new->id; |
| 790 | int i = slots->id_to_index[id]; |
Igor Mammedov | 063584d | 2014-11-13 23:00:13 +0000 | [diff] [blame] | 791 | struct kvm_memory_slot *mslots = slots->memslots; |
Xiao Guangrong | f85e2cb | 2011-11-24 17:41:54 +0800 | [diff] [blame] | 792 | |
Paolo Bonzini | 8593176c | 2014-11-14 10:22:07 +0100 | [diff] [blame] | 793 | WARN_ON(mslots[i].id != id); |
Igor Mammedov | 9c1a5d38 | 2014-12-01 17:29:27 +0000 | [diff] [blame] | 794 | if (!new->npages) { |
Paolo Bonzini | dbaff30 | 2014-12-27 21:08:16 +0100 | [diff] [blame] | 795 | WARN_ON(!mslots[i].npages); |
Igor Mammedov | 9c1a5d38 | 2014-12-01 17:29:27 +0000 | [diff] [blame] | 796 | if (mslots[i].npages) |
| 797 | slots->used_slots--; |
| 798 | } else { |
| 799 | if (!mslots[i].npages) |
| 800 | slots->used_slots++; |
| 801 | } |
Igor Mammedov | 0e60b07 | 2014-12-01 17:29:26 +0000 | [diff] [blame] | 802 | |
Igor Mammedov | 7f379cf | 2014-12-01 17:29:24 +0000 | [diff] [blame] | 803 | while (i < KVM_MEM_SLOTS_NUM - 1 && |
Igor Mammedov | 0e60b07 | 2014-12-01 17:29:26 +0000 | [diff] [blame] | 804 | new->base_gfn <= mslots[i + 1].base_gfn) { |
| 805 | if (!mslots[i + 1].npages) |
| 806 | break; |
Igor Mammedov | 7f379cf | 2014-12-01 17:29:24 +0000 | [diff] [blame] | 807 | mslots[i] = mslots[i + 1]; |
| 808 | slots->id_to_index[mslots[i].id] = i; |
| 809 | i++; |
| 810 | } |
Paolo Bonzini | efbeec7 | 2014-12-27 18:01:00 +0100 | [diff] [blame] | 811 | |
| 812 | /* |
| 813 | * The ">=" is needed when creating a slot with base_gfn == 0, |
| 814 | * so that it moves before all those with base_gfn == npages == 0. |
| 815 | * |
| 816 | * On the other hand, if new->npages is zero, the above loop has |
| 817 | * already left i pointing to the beginning of the empty part of |
| 818 | * mslots, and the ">=" would move the hole backwards in this |
| 819 | * case---which is wrong. So skip the loop when deleting a slot. |
| 820 | */ |
| 821 | if (new->npages) { |
| 822 | while (i > 0 && |
| 823 | new->base_gfn >= mslots[i - 1].base_gfn) { |
| 824 | mslots[i] = mslots[i - 1]; |
| 825 | slots->id_to_index[mslots[i].id] = i; |
| 826 | i--; |
| 827 | } |
Paolo Bonzini | dbaff30 | 2014-12-27 21:08:16 +0100 | [diff] [blame] | 828 | } else |
| 829 | WARN_ON_ONCE(i != slots->used_slots); |
Xiao Guangrong | f85e2cb | 2011-11-24 17:41:54 +0800 | [diff] [blame] | 830 | |
Paolo Bonzini | 8593176c | 2014-11-14 10:22:07 +0100 | [diff] [blame] | 831 | mslots[i] = *new; |
| 832 | slots->id_to_index[mslots[i].id] = i; |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 833 | } |
| 834 | |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 835 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) |
Xiao Guangrong | a50d64d | 2012-08-21 10:58:13 +0800 | [diff] [blame] | 836 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 837 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
| 838 | |
Christoffer Dall | 0f8a4de | 2014-08-26 14:00:37 +0200 | [diff] [blame] | 839 | #ifdef __KVM_HAVE_READONLY_MEM |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 840 | valid_flags |= KVM_MEM_READONLY; |
| 841 | #endif |
| 842 | |
| 843 | if (mem->flags & ~valid_flags) |
Xiao Guangrong | a50d64d | 2012-08-21 10:58:13 +0800 | [diff] [blame] | 844 | return -EINVAL; |
| 845 | |
| 846 | return 0; |
| 847 | } |
| 848 | |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 849 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 850 | int as_id, struct kvm_memslots *slots) |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 851 | { |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 852 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 853 | |
David Matlack | ee3d157 | 2014-08-18 15:46:06 -0700 | [diff] [blame] | 854 | /* |
| 855 | * Set the low bit in the generation, which disables SPTE caching |
| 856 | * until the end of synchronize_srcu_expedited. |
| 857 | */ |
| 858 | WARN_ON(old_memslots->generation & 1); |
| 859 | slots->generation = old_memslots->generation + 1; |
| 860 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 861 | rcu_assign_pointer(kvm->memslots[as_id], slots); |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 862 | synchronize_srcu_expedited(&kvm->srcu); |
Takuya Yoshikawa | e59dbe0 | 2013-07-04 13:40:29 +0900 | [diff] [blame] | 863 | |
David Matlack | ee3d157 | 2014-08-18 15:46:06 -0700 | [diff] [blame] | 864 | /* |
| 865 | * Increment the new memslot generation a second time. This prevents |
| 866 | * vm exits that race with memslot updates from caching a memslot |
| 867 | * generation that will (potentially) be valid forever. |
| 868 | */ |
| 869 | slots->generation++; |
| 870 | |
Paolo Bonzini | 15f4601 | 2015-05-17 21:26:08 +0200 | [diff] [blame] | 871 | kvm_arch_memslots_updated(kvm, slots); |
Takuya Yoshikawa | e59dbe0 | 2013-07-04 13:40:29 +0900 | [diff] [blame] | 872 | |
| 873 | return old_memslots; |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 874 | } |
| 875 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 876 | /* |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 877 | * Allocate some memory and give it an address in the guest physical address |
| 878 | * space. |
| 879 | * |
| 880 | * Discontiguous memory is allowed, mostly for framebuffers. |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 881 | * |
Dominik Dingel | 02d5d55 | 2014-10-27 16:22:56 +0100 | [diff] [blame] | 882 | * Must be called holding kvm->slots_lock for write. |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 883 | */ |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 884 | int __kvm_set_memory_region(struct kvm *kvm, |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 885 | const struct kvm_userspace_memory_region *mem) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 886 | { |
Avi Kivity | 8234b22 | 2010-12-27 12:08:45 +0200 | [diff] [blame] | 887 | int r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 888 | gfn_t base_gfn; |
Heiko Carstens | 28bcb11 | 2009-09-03 17:35:35 +0200 | [diff] [blame] | 889 | unsigned long npages; |
Takuya Yoshikawa | a843fac | 2013-01-11 18:27:43 +0900 | [diff] [blame] | 890 | struct kvm_memory_slot *slot; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 891 | struct kvm_memory_slot old, new; |
Alex Williamson | b7f69c5 | 2012-12-10 10:33:03 -0700 | [diff] [blame] | 892 | struct kvm_memslots *slots = NULL, *old_memslots; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 893 | int as_id, id; |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 894 | enum kvm_mr_change change; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 895 | |
Xiao Guangrong | a50d64d | 2012-08-21 10:58:13 +0800 | [diff] [blame] | 896 | r = check_memory_region_flags(mem); |
| 897 | if (r) |
| 898 | goto out; |
| 899 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 900 | r = -EINVAL; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 901 | as_id = mem->slot >> 16; |
| 902 | id = (u16)mem->slot; |
| 903 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 904 | /* General sanity checks */ |
| 905 | if (mem->memory_size & (PAGE_SIZE - 1)) |
| 906 | goto out; |
| 907 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) |
| 908 | goto out; |
Takuya Yoshikawa | fa3d315 | 2011-05-07 16:35:38 +0900 | [diff] [blame] | 909 | /* We can read the guest memory with __xxx_user() later on. */ |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 910 | if ((id < KVM_USER_MEM_SLOTS) && |
Takuya Yoshikawa | fa3d315 | 2011-05-07 16:35:38 +0900 | [diff] [blame] | 911 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
Heiko Carstens | 9e3bb6b | 2011-05-24 07:51:27 +0200 | [diff] [blame] | 912 | !access_ok(VERIFY_WRITE, |
| 913 | (void __user *)(unsigned long)mem->userspace_addr, |
| 914 | mem->memory_size))) |
Hollis Blanchard | 7874980 | 2008-11-07 13:32:12 -0600 | [diff] [blame] | 915 | goto out; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 916 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 917 | goto out; |
| 918 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) |
| 919 | goto out; |
| 920 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 921 | slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 922 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
| 923 | npages = mem->memory_size >> PAGE_SHIFT; |
| 924 | |
Takuya Yoshikawa | 660c22c | 2010-04-13 22:47:24 +0900 | [diff] [blame] | 925 | if (npages > KVM_MEM_MAX_NR_PAGES) |
| 926 | goto out; |
| 927 | |
Takuya Yoshikawa | a843fac | 2013-01-11 18:27:43 +0900 | [diff] [blame] | 928 | new = old = *slot; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 929 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 930 | new.id = id; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 931 | new.base_gfn = base_gfn; |
| 932 | new.npages = npages; |
| 933 | new.flags = mem->flags; |
| 934 | |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 935 | if (npages) { |
| 936 | if (!old.npages) |
| 937 | change = KVM_MR_CREATE; |
| 938 | else { /* Modify an existing slot. */ |
| 939 | if ((mem->userspace_addr != old.userspace_addr) || |
Takuya Yoshikawa | 75d61fb | 2013-01-30 19:40:41 +0900 | [diff] [blame] | 940 | (npages != old.npages) || |
| 941 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 942 | goto out; |
| 943 | |
| 944 | if (base_gfn != old.base_gfn) |
| 945 | change = KVM_MR_MOVE; |
| 946 | else if (new.flags != old.flags) |
| 947 | change = KVM_MR_FLAGS_ONLY; |
| 948 | else { /* Nothing to change. */ |
| 949 | r = 0; |
| 950 | goto out; |
| 951 | } |
| 952 | } |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 953 | } else { |
| 954 | if (!old.npages) |
| 955 | goto out; |
| 956 | |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 957 | change = KVM_MR_DELETE; |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 958 | new.base_gfn = 0; |
| 959 | new.flags = 0; |
| 960 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 961 | |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 962 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
Takuya Yoshikawa | 0a706be | 2013-01-11 18:26:55 +0900 | [diff] [blame] | 963 | /* Check for overlaps */ |
| 964 | r = -EEXIST; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 965 | kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { |
Takuya Yoshikawa | a843fac | 2013-01-11 18:27:43 +0900 | [diff] [blame] | 966 | if ((slot->id >= KVM_USER_MEM_SLOTS) || |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 967 | (slot->id == id)) |
Takuya Yoshikawa | 0a706be | 2013-01-11 18:26:55 +0900 | [diff] [blame] | 968 | continue; |
| 969 | if (!((base_gfn + npages <= slot->base_gfn) || |
| 970 | (base_gfn >= slot->base_gfn + slot->npages))) |
| 971 | goto out; |
| 972 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 973 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 974 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 975 | /* Free page dirty bitmap if unneeded */ |
| 976 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) |
Al Viro | 8b6d44c | 2007-02-09 16:38:40 +0000 | [diff] [blame] | 977 | new.dirty_bitmap = NULL; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 978 | |
| 979 | r = -ENOMEM; |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 980 | if (change == KVM_MR_CREATE) { |
Takuya Yoshikawa | 189a2f7 | 2012-02-08 13:01:09 +0900 | [diff] [blame] | 981 | new.userspace_addr = mem->userspace_addr; |
Takuya Yoshikawa | d89cc61 | 2012-08-01 18:03:28 +0900 | [diff] [blame] | 982 | |
Aneesh Kumar K.V | 5587027 | 2013-10-07 22:18:00 +0530 | [diff] [blame] | 983 | if (kvm_arch_create_memslot(kvm, &new, npages)) |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 984 | goto out_free; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 985 | } |
Joerg Roedel | ec04b26 | 2009-06-19 15:16:23 +0200 | [diff] [blame] | 986 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 987 | /* Allocate page dirty bitmap if needed */ |
| 988 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 989 | if (kvm_create_dirty_bitmap(&new) < 0) |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 990 | goto out_free; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 991 | } |
| 992 | |
Igor Mammedov | 7449613 | 2015-03-20 12:21:37 +0000 | [diff] [blame] | 993 | slots = kvm_kvzalloc(sizeof(struct kvm_memslots)); |
Paolo Bonzini | f2a8103 | 2014-11-14 10:46:45 +0100 | [diff] [blame] | 994 | if (!slots) |
| 995 | goto out_free; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 996 | memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); |
Paolo Bonzini | f2a8103 | 2014-11-14 10:46:45 +0100 | [diff] [blame] | 997 | |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 998 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 999 | slot = id_to_memslot(slots, id); |
Xiao Guangrong | 28a3754 | 2011-11-24 19:04:35 +0800 | [diff] [blame] | 1000 | slot->flags |= KVM_MEMSLOT_INVALID; |
| 1001 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1002 | old_memslots = install_new_memslots(kvm, as_id, slots); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1003 | |
Alex Williamson | e40f193 | 2012-12-10 10:32:57 -0700 | [diff] [blame] | 1004 | /* slot was deleted or moved, clear iommu mapping */ |
| 1005 | kvm_iommu_unmap_pages(kvm, &old); |
Marcelo Tosatti | 12d6e75 | 2012-08-24 15:54:58 -0300 | [diff] [blame] | 1006 | /* From this point no new shadow pages pointing to a deleted, |
| 1007 | * or moved, memslot will be created. |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1008 | * |
| 1009 | * validation of sp->gfn happens in: |
Xiubo Li | b7d409d | 2015-02-26 14:58:24 +0800 | [diff] [blame] | 1010 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) |
| 1011 | * - kvm_is_visible_gfn (mmu_check_roots) |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1012 | */ |
Marcelo Tosatti | 2df72e9 | 2012-08-24 15:54:57 -0300 | [diff] [blame] | 1013 | kvm_arch_flush_shadow_memslot(kvm, slot); |
Paolo Bonzini | f2a8103 | 2014-11-14 10:46:45 +0100 | [diff] [blame] | 1014 | |
| 1015 | /* |
| 1016 | * We can re-use the old_memslots from above, the only difference |
| 1017 | * from the currently installed memslots is the invalid flag. This |
| 1018 | * will get overwritten by update_memslots anyway. |
| 1019 | */ |
Alex Williamson | b7f69c5 | 2012-12-10 10:33:03 -0700 | [diff] [blame] | 1020 | slots = old_memslots; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1021 | } |
Marcelo Tosatti | 34d4cb8 | 2008-07-10 20:49:31 -0300 | [diff] [blame] | 1022 | |
Takuya Yoshikawa | 7b6195a | 2013-02-27 19:44:34 +0900 | [diff] [blame] | 1023 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); |
Marcelo Tosatti | f7784b8 | 2009-12-23 14:35:18 -0200 | [diff] [blame] | 1024 | if (r) |
Alex Williamson | b7f69c5 | 2012-12-10 10:33:03 -0700 | [diff] [blame] | 1025 | goto out_slots; |
Marcelo Tosatti | f7784b8 | 2009-12-23 14:35:18 -0200 | [diff] [blame] | 1026 | |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 1027 | /* actual memory is freed via old in kvm_free_memslot below */ |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 1028 | if (change == KVM_MR_DELETE) { |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1029 | new.dirty_bitmap = NULL; |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 1030 | memset(&new.arch, 0, sizeof(new.arch)); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1031 | } |
| 1032 | |
Paolo Bonzini | 5cc1502 | 2014-11-14 10:55:31 +0100 | [diff] [blame] | 1033 | update_memslots(slots, &new); |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1034 | old_memslots = install_new_memslots(kvm, as_id, slots); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1035 | |
Paolo Bonzini | f36f3f2 | 2015-05-18 13:20:23 +0200 | [diff] [blame] | 1036 | kvm_arch_commit_memory_region(kvm, mem, &old, &new, change); |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 1037 | |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 1038 | kvm_free_memslot(kvm, &old, &new); |
Igor Mammedov | 7449613 | 2015-03-20 12:21:37 +0000 | [diff] [blame] | 1039 | kvfree(old_memslots); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1040 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1041 | /* |
| 1042 | * IOMMU mapping: New slots need to be mapped. Old slots need to be |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1043 | * un-mapped and re-mapped if their base changes. Since base change |
| 1044 | * unmapping is handled above with slot deletion, mapping alone is |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1045 | * needed here. Anything else the iommu might care about for existing |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1046 | * slots (size changes, userspace addr changes and read-only flag |
| 1047 | * changes) is disallowed above, so any other attribute changes getting |
| 1048 | * here can be skipped. |
Izik Eidus | 210c7c4 | 2007-10-24 23:52:57 +0200 | [diff] [blame] | 1049 | */ |
| 1050 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1051 | r = kvm_iommu_map_pages(kvm, &new); |
Yang Zhang | e0230e1 | 2013-10-24 09:56:39 +0800 | [diff] [blame] | 1052 | return r; |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1053 | } |
| 1054 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1055 | return 0; |
| 1056 | |
| 1057 | out_slots: |
Igor Mammedov | 7449613 | 2015-03-20 12:21:37 +0000 | [diff] [blame] | 1058 | kvfree(slots); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1059 | out_free: |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 1060 | kvm_free_memslot(kvm, &new, &old); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1061 | out: |
| 1062 | return r; |
Izik Eidus | 210c7c4 | 2007-10-24 23:52:57 +0200 | [diff] [blame] | 1063 | } |
| 1064 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1065 | |
| 1066 | int kvm_set_memory_region(struct kvm *kvm, |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 1067 | const struct kvm_userspace_memory_region *mem) |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1068 | { |
| 1069 | int r; |
| 1070 | |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 1071 | mutex_lock(&kvm->slots_lock); |
Takuya Yoshikawa | 47ae31e | 2013-02-27 19:43:00 +0900 | [diff] [blame] | 1072 | r = __kvm_set_memory_region(kvm, mem); |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 1073 | mutex_unlock(&kvm->slots_lock); |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1074 | return r; |
| 1075 | } |
Izik Eidus | 210c7c4 | 2007-10-24 23:52:57 +0200 | [diff] [blame] | 1076 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
| 1077 | |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 1078 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
| 1079 | struct kvm_userspace_memory_region *mem) |
Izik Eidus | 210c7c4 | 2007-10-24 23:52:57 +0200 | [diff] [blame] | 1080 | { |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1081 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1082 | return -EINVAL; |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 1083 | |
Takuya Yoshikawa | 47ae31e | 2013-02-27 19:43:00 +0900 | [diff] [blame] | 1084 | return kvm_set_memory_region(kvm, mem); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1085 | } |
| 1086 | |
Zhang Xiantao | 5bb064d | 2007-11-18 20:29:43 +0800 | [diff] [blame] | 1087 | int kvm_get_dirty_log(struct kvm *kvm, |
| 1088 | struct kvm_dirty_log *log, int *is_dirty) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1089 | { |
Paolo Bonzini | 9f6b802 | 2015-05-17 16:20:07 +0200 | [diff] [blame] | 1090 | struct kvm_memslots *slots; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1091 | struct kvm_memory_slot *memslot; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1092 | int r, i, as_id, id; |
Takuya Yoshikawa | 87bf6e7 | 2010-04-12 19:35:35 +0900 | [diff] [blame] | 1093 | unsigned long n; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1094 | unsigned long any = 0; |
| 1095 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1096 | r = -EINVAL; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1097 | as_id = log->slot >> 16; |
| 1098 | id = (u16)log->slot; |
| 1099 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1100 | goto out; |
| 1101 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1102 | slots = __kvm_memslots(kvm, as_id); |
| 1103 | memslot = id_to_memslot(slots, id); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1104 | r = -ENOENT; |
| 1105 | if (!memslot->dirty_bitmap) |
| 1106 | goto out; |
| 1107 | |
Takuya Yoshikawa | 87bf6e7 | 2010-04-12 19:35:35 +0900 | [diff] [blame] | 1108 | n = kvm_dirty_bitmap_bytes(memslot); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1109 | |
Uri Lublin | cd1a4a9 | 2007-02-22 16:43:09 +0200 | [diff] [blame] | 1110 | for (i = 0; !any && i < n/sizeof(long); ++i) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1111 | any = memslot->dirty_bitmap[i]; |
| 1112 | |
| 1113 | r = -EFAULT; |
| 1114 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) |
| 1115 | goto out; |
| 1116 | |
Zhang Xiantao | 5bb064d | 2007-11-18 20:29:43 +0800 | [diff] [blame] | 1117 | if (any) |
| 1118 | *is_dirty = 1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1119 | |
| 1120 | r = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1121 | out: |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1122 | return r; |
| 1123 | } |
Aneesh Kumar K.V | 2ba9f0d | 2013-10-07 22:17:59 +0530 | [diff] [blame] | 1124 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1125 | |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1126 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
| 1127 | /** |
| 1128 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages |
| 1129 | * are dirty write protect them for next write. |
| 1130 | * @kvm: pointer to kvm instance |
| 1131 | * @log: slot id and address to which we copy the log |
| 1132 | * @is_dirty: flag set if any page is dirty |
| 1133 | * |
| 1134 | * We need to keep it in mind that VCPU threads can write to the bitmap |
| 1135 | * concurrently. So, to avoid losing track of dirty pages we keep the |
| 1136 | * following order: |
| 1137 | * |
| 1138 | * 1. Take a snapshot of the bit and clear it if needed. |
| 1139 | * 2. Write protect the corresponding page. |
| 1140 | * 3. Copy the snapshot to the userspace. |
| 1141 | * 4. Upon return caller flushes TLB's if needed. |
| 1142 | * |
| 1143 | * Between 2 and 4, the guest may write to the page using the remaining TLB |
| 1144 | * entry. This is not a problem because the page is reported dirty using |
| 1145 | * the snapshot taken before and step 4 ensures that writes done after |
| 1146 | * exiting to userspace will be logged for the next call. |
| 1147 | * |
| 1148 | */ |
| 1149 | int kvm_get_dirty_log_protect(struct kvm *kvm, |
| 1150 | struct kvm_dirty_log *log, bool *is_dirty) |
| 1151 | { |
Paolo Bonzini | 9f6b802 | 2015-05-17 16:20:07 +0200 | [diff] [blame] | 1152 | struct kvm_memslots *slots; |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1153 | struct kvm_memory_slot *memslot; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1154 | int r, i, as_id, id; |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1155 | unsigned long n; |
| 1156 | unsigned long *dirty_bitmap; |
| 1157 | unsigned long *dirty_bitmap_buffer; |
| 1158 | |
| 1159 | r = -EINVAL; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1160 | as_id = log->slot >> 16; |
| 1161 | id = (u16)log->slot; |
| 1162 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1163 | goto out; |
| 1164 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1165 | slots = __kvm_memslots(kvm, as_id); |
| 1166 | memslot = id_to_memslot(slots, id); |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1167 | |
| 1168 | dirty_bitmap = memslot->dirty_bitmap; |
| 1169 | r = -ENOENT; |
| 1170 | if (!dirty_bitmap) |
| 1171 | goto out; |
| 1172 | |
| 1173 | n = kvm_dirty_bitmap_bytes(memslot); |
| 1174 | |
| 1175 | dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long); |
| 1176 | memset(dirty_bitmap_buffer, 0, n); |
| 1177 | |
| 1178 | spin_lock(&kvm->mmu_lock); |
| 1179 | *is_dirty = false; |
| 1180 | for (i = 0; i < n / sizeof(long); i++) { |
| 1181 | unsigned long mask; |
| 1182 | gfn_t offset; |
| 1183 | |
| 1184 | if (!dirty_bitmap[i]) |
| 1185 | continue; |
| 1186 | |
| 1187 | *is_dirty = true; |
| 1188 | |
| 1189 | mask = xchg(&dirty_bitmap[i], 0); |
| 1190 | dirty_bitmap_buffer[i] = mask; |
| 1191 | |
Takuya Yoshikawa | 58d2930 | 2015-03-17 16:19:58 +0900 | [diff] [blame] | 1192 | if (mask) { |
| 1193 | offset = i * BITS_PER_LONG; |
| 1194 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, |
| 1195 | offset, mask); |
| 1196 | } |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1197 | } |
| 1198 | |
| 1199 | spin_unlock(&kvm->mmu_lock); |
| 1200 | |
| 1201 | r = -EFAULT; |
| 1202 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) |
| 1203 | goto out; |
| 1204 | |
| 1205 | r = 0; |
| 1206 | out: |
| 1207 | return r; |
| 1208 | } |
| 1209 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect); |
| 1210 | #endif |
| 1211 | |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 1212 | bool kvm_largepages_enabled(void) |
| 1213 | { |
| 1214 | return largepages_enabled; |
| 1215 | } |
| 1216 | |
Marcelo Tosatti | 54dee99 | 2009-06-11 12:07:44 -0300 | [diff] [blame] | 1217 | void kvm_disable_largepages(void) |
| 1218 | { |
| 1219 | largepages_enabled = false; |
| 1220 | } |
| 1221 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); |
| 1222 | |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1223 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
| 1224 | { |
| 1225 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); |
| 1226 | } |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 1227 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1228 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1229 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1230 | { |
| 1231 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); |
| 1232 | } |
| 1233 | |
Yaowei Bai | 33e9415 | 2015-11-14 11:21:06 +0800 | [diff] [blame] | 1234 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1235 | { |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 1236 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1237 | |
Alex Williamson | bbacc0c | 2012-12-10 10:33:09 -0700 | [diff] [blame] | 1238 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 1239 | memslot->flags & KVM_MEMSLOT_INVALID) |
Yaowei Bai | 33e9415 | 2015-11-14 11:21:06 +0800 | [diff] [blame] | 1240 | return false; |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1241 | |
Yaowei Bai | 33e9415 | 2015-11-14 11:21:06 +0800 | [diff] [blame] | 1242 | return true; |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1243 | } |
| 1244 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); |
| 1245 | |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 1246 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
| 1247 | { |
| 1248 | struct vm_area_struct *vma; |
| 1249 | unsigned long addr, size; |
| 1250 | |
| 1251 | size = PAGE_SIZE; |
| 1252 | |
| 1253 | addr = gfn_to_hva(kvm, gfn); |
| 1254 | if (kvm_is_error_hva(addr)) |
| 1255 | return PAGE_SIZE; |
| 1256 | |
| 1257 | down_read(¤t->mm->mmap_sem); |
| 1258 | vma = find_vma(current->mm, addr); |
| 1259 | if (!vma) |
| 1260 | goto out; |
| 1261 | |
| 1262 | size = vma_kernel_pagesize(vma); |
| 1263 | |
| 1264 | out: |
| 1265 | up_read(¤t->mm->mmap_sem); |
| 1266 | |
| 1267 | return size; |
| 1268 | } |
| 1269 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1270 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
| 1271 | { |
| 1272 | return slot->flags & KVM_MEM_READONLY; |
| 1273 | } |
| 1274 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1275 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1276 | gfn_t *nr_pages, bool write) |
Izik Eidus | 539cb66 | 2007-11-11 22:05:04 +0200 | [diff] [blame] | 1277 | { |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1278 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
Xiao Guangrong | ca3a490 | 2012-08-21 11:01:50 +0800 | [diff] [blame] | 1279 | return KVM_HVA_ERR_BAD; |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1280 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1281 | if (memslot_is_readonly(slot) && write) |
| 1282 | return KVM_HVA_ERR_RO_BAD; |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1283 | |
| 1284 | if (nr_pages) |
| 1285 | *nr_pages = slot->npages - (gfn - slot->base_gfn); |
| 1286 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1287 | return __gfn_to_hva_memslot(slot, gfn); |
Izik Eidus | 539cb66 | 2007-11-11 22:05:04 +0200 | [diff] [blame] | 1288 | } |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1289 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1290 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1291 | gfn_t *nr_pages) |
| 1292 | { |
| 1293 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); |
| 1294 | } |
| 1295 | |
| 1296 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 1297 | gfn_t gfn) |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1298 | { |
| 1299 | return gfn_to_hva_many(slot, gfn, NULL); |
| 1300 | } |
| 1301 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); |
| 1302 | |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1303 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
| 1304 | { |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1305 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1306 | } |
Sheng Yang | 0d15029 | 2008-04-25 21:44:50 +0800 | [diff] [blame] | 1307 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
Izik Eidus | 539cb66 | 2007-11-11 22:05:04 +0200 | [diff] [blame] | 1308 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1309 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1310 | { |
| 1311 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); |
| 1312 | } |
| 1313 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); |
| 1314 | |
Xiao Guangrong | 86ab8cf | 2012-08-21 10:59:53 +0800 | [diff] [blame] | 1315 | /* |
Paolo Bonzini | ba6a354 | 2013-09-09 13:52:33 +0200 | [diff] [blame] | 1316 | * If writable is set to false, the hva returned by this function is only |
| 1317 | * allowed to be read. |
Xiao Guangrong | 86ab8cf | 2012-08-21 10:59:53 +0800 | [diff] [blame] | 1318 | */ |
Christoffer Dall | 64d8312 | 2014-08-19 12:15:00 +0200 | [diff] [blame] | 1319 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
| 1320 | gfn_t gfn, bool *writable) |
Gleb Natapov | 8030089 | 2010-10-19 18:13:41 +0200 | [diff] [blame] | 1321 | { |
Gleb Natapov | a2ac07f | 2013-10-01 19:58:36 +0300 | [diff] [blame] | 1322 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
| 1323 | |
| 1324 | if (!kvm_is_error_hva(hva) && writable) |
Paolo Bonzini | ba6a354 | 2013-09-09 13:52:33 +0200 | [diff] [blame] | 1325 | *writable = !memslot_is_readonly(slot); |
| 1326 | |
Gleb Natapov | a2ac07f | 2013-10-01 19:58:36 +0300 | [diff] [blame] | 1327 | return hva; |
Xiao Guangrong | 86ab8cf | 2012-08-21 10:59:53 +0800 | [diff] [blame] | 1328 | } |
| 1329 | |
Christoffer Dall | 64d8312 | 2014-08-19 12:15:00 +0200 | [diff] [blame] | 1330 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
| 1331 | { |
| 1332 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); |
| 1333 | |
| 1334 | return gfn_to_hva_memslot_prot(slot, gfn, writable); |
| 1335 | } |
| 1336 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1337 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) |
| 1338 | { |
| 1339 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 1340 | |
| 1341 | return gfn_to_hva_memslot_prot(slot, gfn, writable); |
| 1342 | } |
| 1343 | |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 1344 | static int get_user_page_nowait(unsigned long start, int write, |
| 1345 | struct page **page) |
Gleb Natapov | 0857b9e | 2011-02-01 13:21:47 +0200 | [diff] [blame] | 1346 | { |
| 1347 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; |
| 1348 | |
| 1349 | if (write) |
| 1350 | flags |= FOLL_WRITE; |
| 1351 | |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 1352 | return __get_user_pages(current, current->mm, start, 1, flags, page, |
| 1353 | NULL, NULL); |
Gleb Natapov | 0857b9e | 2011-02-01 13:21:47 +0200 | [diff] [blame] | 1354 | } |
| 1355 | |
Huang Ying | fafc3db | 2011-01-30 11:15:49 +0800 | [diff] [blame] | 1356 | static inline int check_user_page_hwpoison(unsigned long addr) |
| 1357 | { |
| 1358 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; |
| 1359 | |
| 1360 | rc = __get_user_pages(current, current->mm, addr, 1, |
| 1361 | flags, NULL, NULL, NULL); |
| 1362 | return rc == -EHWPOISON; |
| 1363 | } |
| 1364 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1365 | /* |
| 1366 | * The atomic path to get the writable pfn which will be stored in @pfn, |
| 1367 | * true indicates success, otherwise false is returned. |
| 1368 | */ |
| 1369 | static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async, |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1370 | bool write_fault, bool *writable, kvm_pfn_t *pfn) |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1371 | { |
| 1372 | struct page *page[1]; |
| 1373 | int npages; |
| 1374 | |
| 1375 | if (!(async || atomic)) |
| 1376 | return false; |
| 1377 | |
Xiao Guangrong | 12ce13f | 2012-08-21 11:00:49 +0800 | [diff] [blame] | 1378 | /* |
| 1379 | * Fast pin a writable pfn only if it is a write fault request |
| 1380 | * or the caller allows to map a writable pfn for a read fault |
| 1381 | * request. |
| 1382 | */ |
| 1383 | if (!(write_fault || writable)) |
| 1384 | return false; |
| 1385 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1386 | npages = __get_user_pages_fast(addr, 1, 1, page); |
| 1387 | if (npages == 1) { |
| 1388 | *pfn = page_to_pfn(page[0]); |
| 1389 | |
| 1390 | if (writable) |
| 1391 | *writable = true; |
| 1392 | return true; |
| 1393 | } |
| 1394 | |
| 1395 | return false; |
| 1396 | } |
| 1397 | |
| 1398 | /* |
| 1399 | * The slow path to get the pfn of the specified host virtual address, |
| 1400 | * 1 indicates success, -errno is returned if error is detected. |
| 1401 | */ |
| 1402 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1403 | bool *writable, kvm_pfn_t *pfn) |
Avi Kivity | 954bbbc | 2007-03-30 14:02:32 +0300 | [diff] [blame] | 1404 | { |
Anthony Liguori | 8d4e128 | 2007-10-18 09:59:34 -0500 | [diff] [blame] | 1405 | struct page *page[1]; |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 1406 | int npages = 0; |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1407 | |
| 1408 | might_sleep(); |
| 1409 | |
| 1410 | if (writable) |
| 1411 | *writable = write_fault; |
| 1412 | |
| 1413 | if (async) { |
| 1414 | down_read(¤t->mm->mmap_sem); |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 1415 | npages = get_user_page_nowait(addr, write_fault, page); |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1416 | up_read(¤t->mm->mmap_sem); |
Andrea Arcangeli | 0664e57 | 2015-02-11 15:27:28 -0800 | [diff] [blame] | 1417 | } else |
| 1418 | npages = __get_user_pages_unlocked(current, current->mm, addr, 1, |
| 1419 | write_fault, 0, page, |
| 1420 | FOLL_TOUCH|FOLL_HWPOISON); |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1421 | if (npages != 1) |
| 1422 | return npages; |
| 1423 | |
| 1424 | /* map read fault as writable if possible */ |
Xiao Guangrong | 12ce13f | 2012-08-21 11:00:49 +0800 | [diff] [blame] | 1425 | if (unlikely(!write_fault) && writable) { |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1426 | struct page *wpage[1]; |
| 1427 | |
| 1428 | npages = __get_user_pages_fast(addr, 1, 1, wpage); |
| 1429 | if (npages == 1) { |
| 1430 | *writable = true; |
| 1431 | put_page(page[0]); |
| 1432 | page[0] = wpage[0]; |
| 1433 | } |
| 1434 | |
| 1435 | npages = 1; |
| 1436 | } |
| 1437 | *pfn = page_to_pfn(page[0]); |
| 1438 | return npages; |
| 1439 | } |
| 1440 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1441 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
| 1442 | { |
| 1443 | if (unlikely(!(vma->vm_flags & VM_READ))) |
| 1444 | return false; |
| 1445 | |
| 1446 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
| 1447 | return false; |
| 1448 | |
| 1449 | return true; |
| 1450 | } |
| 1451 | |
Paolo Bonzini | 92176a8 | 2016-06-07 16:22:47 +0200 | [diff] [blame] | 1452 | static int hva_to_pfn_remapped(struct vm_area_struct *vma, |
| 1453 | unsigned long addr, bool *async, |
| 1454 | bool write_fault, kvm_pfn_t *p_pfn) |
| 1455 | { |
Paolo Bonzini | add6a0c | 2016-06-07 17:51:18 +0200 | [diff] [blame] | 1456 | unsigned long pfn; |
| 1457 | int r; |
| 1458 | |
| 1459 | r = follow_pfn(vma, addr, &pfn); |
| 1460 | if (r) { |
| 1461 | /* |
| 1462 | * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does |
| 1463 | * not call the fault handler, so do it here. |
| 1464 | */ |
| 1465 | bool unlocked = false; |
| 1466 | r = fixup_user_fault(current, current->mm, addr, |
| 1467 | (write_fault ? FAULT_FLAG_WRITE : 0), |
| 1468 | &unlocked); |
| 1469 | if (unlocked) |
| 1470 | return -EAGAIN; |
| 1471 | if (r) |
| 1472 | return r; |
| 1473 | |
| 1474 | r = follow_pfn(vma, addr, &pfn); |
| 1475 | if (r) |
| 1476 | return r; |
| 1477 | |
| 1478 | } |
| 1479 | |
| 1480 | |
| 1481 | /* |
| 1482 | * Get a reference here because callers of *hva_to_pfn* and |
| 1483 | * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the |
| 1484 | * returned pfn. This is only needed if the VMA has VM_MIXEDMAP |
| 1485 | * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will |
| 1486 | * simply do nothing for reserved pfns. |
| 1487 | * |
| 1488 | * Whoever called remap_pfn_range is also going to call e.g. |
| 1489 | * unmap_mapping_range before the underlying pages are freed, |
| 1490 | * causing a call to our MMU notifier. |
| 1491 | */ |
| 1492 | kvm_get_pfn(pfn); |
| 1493 | |
| 1494 | *p_pfn = pfn; |
Paolo Bonzini | 92176a8 | 2016-06-07 16:22:47 +0200 | [diff] [blame] | 1495 | return 0; |
| 1496 | } |
| 1497 | |
Xiao Guangrong | 12ce13f | 2012-08-21 11:00:49 +0800 | [diff] [blame] | 1498 | /* |
| 1499 | * Pin guest page in memory and return its pfn. |
| 1500 | * @addr: host virtual address which maps memory to the guest |
| 1501 | * @atomic: whether this function can sleep |
| 1502 | * @async: whether this function need to wait IO complete if the |
| 1503 | * host page is not in the memory |
| 1504 | * @write_fault: whether we should get a writable host page |
| 1505 | * @writable: whether it allows to map a writable host page for !@write_fault |
| 1506 | * |
| 1507 | * The function will map a writable host page for these two cases: |
| 1508 | * 1): @write_fault = true |
| 1509 | * 2): @write_fault = false && @writable, @writable will tell the caller |
| 1510 | * whether the mapping is writable. |
| 1511 | */ |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1512 | static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1513 | bool write_fault, bool *writable) |
| 1514 | { |
| 1515 | struct vm_area_struct *vma; |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1516 | kvm_pfn_t pfn = 0; |
Paolo Bonzini | 92176a8 | 2016-06-07 16:22:47 +0200 | [diff] [blame] | 1517 | int npages, r; |
Avi Kivity | 954bbbc | 2007-03-30 14:02:32 +0300 | [diff] [blame] | 1518 | |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 1519 | /* we can do it either atomically or asynchronously, not both */ |
| 1520 | BUG_ON(atomic && async); |
| 1521 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1522 | if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) |
| 1523 | return pfn; |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 1524 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1525 | if (atomic) |
| 1526 | return KVM_PFN_ERR_FAULT; |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 1527 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1528 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); |
| 1529 | if (npages == 1) |
| 1530 | return pfn; |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 1531 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1532 | down_read(¤t->mm->mmap_sem); |
| 1533 | if (npages == -EHWPOISON || |
| 1534 | (!async && check_user_page_hwpoison(addr))) { |
| 1535 | pfn = KVM_PFN_ERR_HWPOISON; |
| 1536 | goto exit; |
Xiao Guangrong | 887c08a | 2010-08-22 19:10:28 +0800 | [diff] [blame] | 1537 | } |
Izik Eidus | 539cb66 | 2007-11-11 22:05:04 +0200 | [diff] [blame] | 1538 | |
Paolo Bonzini | add6a0c | 2016-06-07 17:51:18 +0200 | [diff] [blame] | 1539 | retry: |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1540 | vma = find_vma_intersection(current->mm, addr, addr + 1); |
Anthony Liguori | 8d4e128 | 2007-10-18 09:59:34 -0500 | [diff] [blame] | 1541 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1542 | if (vma == NULL) |
| 1543 | pfn = KVM_PFN_ERR_FAULT; |
Paolo Bonzini | 92176a8 | 2016-06-07 16:22:47 +0200 | [diff] [blame] | 1544 | else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { |
| 1545 | r = hva_to_pfn_remapped(vma, addr, async, write_fault, &pfn); |
Paolo Bonzini | add6a0c | 2016-06-07 17:51:18 +0200 | [diff] [blame] | 1546 | if (r == -EAGAIN) |
| 1547 | goto retry; |
Paolo Bonzini | 92176a8 | 2016-06-07 16:22:47 +0200 | [diff] [blame] | 1548 | if (r < 0) |
| 1549 | pfn = KVM_PFN_ERR_FAULT; |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1550 | } else { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1551 | if (async && vma_is_valid(vma, write_fault)) |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1552 | *async = true; |
| 1553 | pfn = KVM_PFN_ERR_FAULT; |
| 1554 | } |
| 1555 | exit: |
| 1556 | up_read(¤t->mm->mmap_sem); |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1557 | return pfn; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1558 | } |
| 1559 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1560 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1561 | bool atomic, bool *async, bool write_fault, |
| 1562 | bool *writable) |
Xiao Guangrong | 887c08a | 2010-08-22 19:10:28 +0800 | [diff] [blame] | 1563 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1564 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
| 1565 | |
Paolo Bonzini | b2740d3 | 2016-02-23 15:36:01 +0100 | [diff] [blame] | 1566 | if (addr == KVM_HVA_ERR_RO_BAD) { |
| 1567 | if (writable) |
| 1568 | *writable = false; |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1569 | return KVM_PFN_ERR_RO_FAULT; |
Paolo Bonzini | b2740d3 | 2016-02-23 15:36:01 +0100 | [diff] [blame] | 1570 | } |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1571 | |
Paolo Bonzini | b2740d3 | 2016-02-23 15:36:01 +0100 | [diff] [blame] | 1572 | if (kvm_is_error_hva(addr)) { |
| 1573 | if (writable) |
| 1574 | *writable = false; |
Xiao Guangrong | 81c52c5 | 2012-10-16 20:10:59 +0800 | [diff] [blame] | 1575 | return KVM_PFN_NOSLOT; |
Paolo Bonzini | b2740d3 | 2016-02-23 15:36:01 +0100 | [diff] [blame] | 1576 | } |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1577 | |
| 1578 | /* Do not map writable pfn in the readonly memslot. */ |
| 1579 | if (writable && memslot_is_readonly(slot)) { |
| 1580 | *writable = false; |
| 1581 | writable = NULL; |
| 1582 | } |
| 1583 | |
| 1584 | return hva_to_pfn(addr, atomic, async, write_fault, |
| 1585 | writable); |
Xiao Guangrong | 887c08a | 2010-08-22 19:10:28 +0800 | [diff] [blame] | 1586 | } |
Paolo Bonzini | 3520469 | 2015-04-02 11:20:48 +0200 | [diff] [blame] | 1587 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); |
Xiao Guangrong | 887c08a | 2010-08-22 19:10:28 +0800 | [diff] [blame] | 1588 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1589 | kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 1590 | bool *writable) |
| 1591 | { |
Paolo Bonzini | e37afc6 | 2015-05-19 16:09:04 +0200 | [diff] [blame] | 1592 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, |
| 1593 | write_fault, writable); |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 1594 | } |
| 1595 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); |
| 1596 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1597 | kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
Marcelo Tosatti | 506f0d6 | 2009-12-23 14:35:19 -0200 | [diff] [blame] | 1598 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1599 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
Marcelo Tosatti | 506f0d6 | 2009-12-23 14:35:19 -0200 | [diff] [blame] | 1600 | } |
Paolo Bonzini | e37afc6 | 2015-05-19 16:09:04 +0200 | [diff] [blame] | 1601 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); |
Marcelo Tosatti | 506f0d6 | 2009-12-23 14:35:19 -0200 | [diff] [blame] | 1602 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1603 | kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
Xiao Guangrong | 037d92d | 2012-08-21 10:59:12 +0800 | [diff] [blame] | 1604 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1605 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
Xiao Guangrong | 037d92d | 2012-08-21 10:59:12 +0800 | [diff] [blame] | 1606 | } |
| 1607 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
| 1608 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1609 | kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) |
Paolo Bonzini | e37afc6 | 2015-05-19 16:09:04 +0200 | [diff] [blame] | 1610 | { |
| 1611 | return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn); |
| 1612 | } |
| 1613 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); |
| 1614 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1615 | kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1616 | { |
| 1617 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); |
| 1618 | } |
| 1619 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); |
| 1620 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1621 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
Paolo Bonzini | e37afc6 | 2015-05-19 16:09:04 +0200 | [diff] [blame] | 1622 | { |
| 1623 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); |
| 1624 | } |
| 1625 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
| 1626 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1627 | kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1628 | { |
| 1629 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); |
| 1630 | } |
| 1631 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); |
| 1632 | |
Paolo Bonzini | d9ef13c | 2015-05-19 16:01:50 +0200 | [diff] [blame] | 1633 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1634 | struct page **pages, int nr_pages) |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1635 | { |
| 1636 | unsigned long addr; |
| 1637 | gfn_t entry; |
| 1638 | |
Paolo Bonzini | d9ef13c | 2015-05-19 16:01:50 +0200 | [diff] [blame] | 1639 | addr = gfn_to_hva_many(slot, gfn, &entry); |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1640 | if (kvm_is_error_hva(addr)) |
| 1641 | return -1; |
| 1642 | |
| 1643 | if (entry < nr_pages) |
| 1644 | return 0; |
| 1645 | |
| 1646 | return __get_user_pages_fast(addr, nr_pages, 1, pages); |
| 1647 | } |
| 1648 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); |
| 1649 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1650 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1651 | { |
Xiao Guangrong | 81c52c5 | 2012-10-16 20:10:59 +0800 | [diff] [blame] | 1652 | if (is_error_noslot_pfn(pfn)) |
Xiao Guangrong | 6cede2e | 2012-08-03 15:41:22 +0800 | [diff] [blame] | 1653 | return KVM_ERR_PTR_BAD_PAGE; |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1654 | |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1655 | if (kvm_is_reserved_pfn(pfn)) { |
Xiao Guangrong | cb9aaa3 | 2012-08-03 15:42:10 +0800 | [diff] [blame] | 1656 | WARN_ON(1); |
| 1657 | return KVM_ERR_PTR_BAD_PAGE; |
| 1658 | } |
| 1659 | |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1660 | return pfn_to_page(pfn); |
| 1661 | } |
| 1662 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1663 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
| 1664 | { |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1665 | kvm_pfn_t pfn; |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1666 | |
| 1667 | pfn = gfn_to_pfn(kvm, gfn); |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1668 | |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1669 | return kvm_pfn_to_page(pfn); |
Avi Kivity | 954bbbc | 2007-03-30 14:02:32 +0300 | [diff] [blame] | 1670 | } |
| 1671 | EXPORT_SYMBOL_GPL(gfn_to_page); |
| 1672 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1673 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1674 | { |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1675 | kvm_pfn_t pfn; |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1676 | |
| 1677 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); |
| 1678 | |
| 1679 | return kvm_pfn_to_page(pfn); |
| 1680 | } |
| 1681 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); |
| 1682 | |
Izik Eidus | b4231d6 | 2007-11-20 11:49:33 +0200 | [diff] [blame] | 1683 | void kvm_release_page_clean(struct page *page) |
| 1684 | { |
Xiao Guangrong | 32cad84 | 2012-08-03 15:42:52 +0800 | [diff] [blame] | 1685 | WARN_ON(is_error_page(page)); |
| 1686 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1687 | kvm_release_pfn_clean(page_to_pfn(page)); |
Izik Eidus | b4231d6 | 2007-11-20 11:49:33 +0200 | [diff] [blame] | 1688 | } |
| 1689 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); |
| 1690 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1691 | void kvm_release_pfn_clean(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1692 | { |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1693 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1694 | put_page(pfn_to_page(pfn)); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1695 | } |
| 1696 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); |
| 1697 | |
Izik Eidus | b4231d6 | 2007-11-20 11:49:33 +0200 | [diff] [blame] | 1698 | void kvm_release_page_dirty(struct page *page) |
Izik Eidus | 8a7ae05 | 2007-10-18 11:09:33 +0200 | [diff] [blame] | 1699 | { |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1700 | WARN_ON(is_error_page(page)); |
| 1701 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1702 | kvm_release_pfn_dirty(page_to_pfn(page)); |
Izik Eidus | 8a7ae05 | 2007-10-18 11:09:33 +0200 | [diff] [blame] | 1703 | } |
Izik Eidus | b4231d6 | 2007-11-20 11:49:33 +0200 | [diff] [blame] | 1704 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); |
Izik Eidus | 8a7ae05 | 2007-10-18 11:09:33 +0200 | [diff] [blame] | 1705 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1706 | static void kvm_release_pfn_dirty(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1707 | { |
| 1708 | kvm_set_pfn_dirty(pfn); |
| 1709 | kvm_release_pfn_clean(pfn); |
| 1710 | } |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1711 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1712 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1713 | { |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1714 | if (!kvm_is_reserved_pfn(pfn)) { |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1715 | struct page *page = pfn_to_page(pfn); |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 1716 | |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1717 | if (!PageReserved(page)) |
| 1718 | SetPageDirty(page); |
| 1719 | } |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1720 | } |
| 1721 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
| 1722 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1723 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1724 | { |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1725 | if (!kvm_is_reserved_pfn(pfn)) |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1726 | mark_page_accessed(pfn_to_page(pfn)); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1727 | } |
| 1728 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); |
| 1729 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1730 | void kvm_get_pfn(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1731 | { |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1732 | if (!kvm_is_reserved_pfn(pfn)) |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1733 | get_page(pfn_to_page(pfn)); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1734 | } |
| 1735 | EXPORT_SYMBOL_GPL(kvm_get_pfn); |
| 1736 | |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1737 | static int next_segment(unsigned long len, int offset) |
| 1738 | { |
| 1739 | if (len > PAGE_SIZE - offset) |
| 1740 | return PAGE_SIZE - offset; |
| 1741 | else |
| 1742 | return len; |
| 1743 | } |
| 1744 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1745 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1746 | void *data, int offset, int len) |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1747 | { |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1748 | int r; |
| 1749 | unsigned long addr; |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1750 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1751 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1752 | if (kvm_is_error_hva(addr)) |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1753 | return -EFAULT; |
Paolo Bonzini | 3180a7f | 2015-04-02 14:08:20 +0200 | [diff] [blame] | 1754 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1755 | if (r) |
| 1756 | return -EFAULT; |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1757 | return 0; |
| 1758 | } |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1759 | |
| 1760 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, |
| 1761 | int len) |
| 1762 | { |
| 1763 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); |
| 1764 | |
| 1765 | return __kvm_read_guest_page(slot, gfn, data, offset, len); |
| 1766 | } |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1767 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
| 1768 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1769 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, |
| 1770 | int offset, int len) |
| 1771 | { |
| 1772 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 1773 | |
| 1774 | return __kvm_read_guest_page(slot, gfn, data, offset, len); |
| 1775 | } |
| 1776 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); |
| 1777 | |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1778 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
| 1779 | { |
| 1780 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1781 | int seg; |
| 1782 | int offset = offset_in_page(gpa); |
| 1783 | int ret; |
| 1784 | |
| 1785 | while ((seg = next_segment(len, offset)) != 0) { |
| 1786 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); |
| 1787 | if (ret < 0) |
| 1788 | return ret; |
| 1789 | offset = 0; |
| 1790 | len -= seg; |
| 1791 | data += seg; |
| 1792 | ++gfn; |
| 1793 | } |
| 1794 | return 0; |
| 1795 | } |
| 1796 | EXPORT_SYMBOL_GPL(kvm_read_guest); |
| 1797 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1798 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) |
| 1799 | { |
| 1800 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1801 | int seg; |
| 1802 | int offset = offset_in_page(gpa); |
| 1803 | int ret; |
| 1804 | |
| 1805 | while ((seg = next_segment(len, offset)) != 0) { |
| 1806 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); |
| 1807 | if (ret < 0) |
| 1808 | return ret; |
| 1809 | offset = 0; |
| 1810 | len -= seg; |
| 1811 | data += seg; |
| 1812 | ++gfn; |
| 1813 | } |
| 1814 | return 0; |
| 1815 | } |
| 1816 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); |
| 1817 | |
| 1818 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1819 | void *data, int offset, unsigned long len) |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1820 | { |
| 1821 | int r; |
| 1822 | unsigned long addr; |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1823 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1824 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1825 | if (kvm_is_error_hva(addr)) |
| 1826 | return -EFAULT; |
Andrea Arcangeli | 0aac03f | 2008-01-30 19:57:35 +0100 | [diff] [blame] | 1827 | pagefault_disable(); |
Paolo Bonzini | 3180a7f | 2015-04-02 14:08:20 +0200 | [diff] [blame] | 1828 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
Andrea Arcangeli | 0aac03f | 2008-01-30 19:57:35 +0100 | [diff] [blame] | 1829 | pagefault_enable(); |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1830 | if (r) |
| 1831 | return -EFAULT; |
| 1832 | return 0; |
| 1833 | } |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1834 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1835 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
| 1836 | unsigned long len) |
| 1837 | { |
| 1838 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1839 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); |
| 1840 | int offset = offset_in_page(gpa); |
| 1841 | |
| 1842 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); |
| 1843 | } |
| 1844 | EXPORT_SYMBOL_GPL(kvm_read_guest_atomic); |
| 1845 | |
| 1846 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, |
| 1847 | void *data, unsigned long len) |
| 1848 | { |
| 1849 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1850 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 1851 | int offset = offset_in_page(gpa); |
| 1852 | |
| 1853 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); |
| 1854 | } |
| 1855 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); |
| 1856 | |
| 1857 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, |
| 1858 | const void *data, int offset, int len) |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1859 | { |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1860 | int r; |
| 1861 | unsigned long addr; |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1862 | |
Radim Krčmář | 251eb84 | 2015-04-10 21:47:27 +0200 | [diff] [blame] | 1863 | addr = gfn_to_hva_memslot(memslot, gfn); |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1864 | if (kvm_is_error_hva(addr)) |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1865 | return -EFAULT; |
Xiao Guangrong | 8b0cedf | 2011-05-15 23:22:04 +0800 | [diff] [blame] | 1866 | r = __copy_to_user((void __user *)addr + offset, data, len); |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1867 | if (r) |
| 1868 | return -EFAULT; |
Paolo Bonzini | bc009e4 | 2015-05-26 12:43:41 +0200 | [diff] [blame] | 1869 | mark_page_dirty_in_slot(memslot, gfn); |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1870 | return 0; |
| 1871 | } |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1872 | |
| 1873 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, |
| 1874 | const void *data, int offset, int len) |
| 1875 | { |
| 1876 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); |
| 1877 | |
| 1878 | return __kvm_write_guest_page(slot, gfn, data, offset, len); |
| 1879 | } |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1880 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
| 1881 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1882 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 1883 | const void *data, int offset, int len) |
| 1884 | { |
| 1885 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 1886 | |
| 1887 | return __kvm_write_guest_page(slot, gfn, data, offset, len); |
| 1888 | } |
| 1889 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); |
| 1890 | |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1891 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
| 1892 | unsigned long len) |
| 1893 | { |
| 1894 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1895 | int seg; |
| 1896 | int offset = offset_in_page(gpa); |
| 1897 | int ret; |
| 1898 | |
| 1899 | while ((seg = next_segment(len, offset)) != 0) { |
| 1900 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); |
| 1901 | if (ret < 0) |
| 1902 | return ret; |
| 1903 | offset = 0; |
| 1904 | len -= seg; |
| 1905 | data += seg; |
| 1906 | ++gfn; |
| 1907 | } |
| 1908 | return 0; |
| 1909 | } |
Wincy Van | ff651cb | 2014-12-11 08:52:58 +0300 | [diff] [blame] | 1910 | EXPORT_SYMBOL_GPL(kvm_write_guest); |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1911 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1912 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, |
| 1913 | unsigned long len) |
| 1914 | { |
| 1915 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1916 | int seg; |
| 1917 | int offset = offset_in_page(gpa); |
| 1918 | int ret; |
| 1919 | |
| 1920 | while ((seg = next_segment(len, offset)) != 0) { |
| 1921 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); |
| 1922 | if (ret < 0) |
| 1923 | return ret; |
| 1924 | offset = 0; |
| 1925 | len -= seg; |
| 1926 | data += seg; |
| 1927 | ++gfn; |
| 1928 | } |
| 1929 | return 0; |
| 1930 | } |
| 1931 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); |
| 1932 | |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1933 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1934 | gpa_t gpa, unsigned long len) |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1935 | { |
| 1936 | struct kvm_memslots *slots = kvm_memslots(kvm); |
| 1937 | int offset = offset_in_page(gpa); |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1938 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
| 1939 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; |
| 1940 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; |
| 1941 | gfn_t nr_pages_avail; |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1942 | |
| 1943 | ghc->gpa = gpa; |
| 1944 | ghc->generation = slots->generation; |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1945 | ghc->len = len; |
| 1946 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); |
Radim Krčmář | ca3f087 | 2015-04-08 14:16:48 +0200 | [diff] [blame] | 1947 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL); |
| 1948 | if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) { |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1949 | ghc->hva += offset; |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1950 | } else { |
| 1951 | /* |
| 1952 | * If the requested region crosses two memslots, we still |
| 1953 | * verify that the entire region is valid here. |
| 1954 | */ |
| 1955 | while (start_gfn <= end_gfn) { |
| 1956 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); |
| 1957 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, |
| 1958 | &nr_pages_avail); |
| 1959 | if (kvm_is_error_hva(ghc->hva)) |
| 1960 | return -EFAULT; |
| 1961 | start_gfn += nr_pages_avail; |
| 1962 | } |
| 1963 | /* Use the slow path for cross page reads and writes. */ |
| 1964 | ghc->memslot = NULL; |
| 1965 | } |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1966 | return 0; |
| 1967 | } |
| 1968 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); |
| 1969 | |
| 1970 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
| 1971 | void *data, unsigned long len) |
| 1972 | { |
| 1973 | struct kvm_memslots *slots = kvm_memslots(kvm); |
| 1974 | int r; |
| 1975 | |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1976 | BUG_ON(len > ghc->len); |
| 1977 | |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1978 | if (slots->generation != ghc->generation) |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1979 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
| 1980 | |
| 1981 | if (unlikely(!ghc->memslot)) |
| 1982 | return kvm_write_guest(kvm, ghc->gpa, data, len); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1983 | |
| 1984 | if (kvm_is_error_hva(ghc->hva)) |
| 1985 | return -EFAULT; |
| 1986 | |
Xiao Guangrong | 8b0cedf | 2011-05-15 23:22:04 +0800 | [diff] [blame] | 1987 | r = __copy_to_user((void __user *)ghc->hva, data, len); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1988 | if (r) |
| 1989 | return -EFAULT; |
Paolo Bonzini | bc009e4 | 2015-05-26 12:43:41 +0200 | [diff] [blame] | 1990 | mark_page_dirty_in_slot(ghc->memslot, ghc->gpa >> PAGE_SHIFT); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1991 | |
| 1992 | return 0; |
| 1993 | } |
| 1994 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); |
| 1995 | |
Gleb Natapov | e03b644 | 2011-07-11 15:28:11 -0400 | [diff] [blame] | 1996 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
| 1997 | void *data, unsigned long len) |
| 1998 | { |
| 1999 | struct kvm_memslots *slots = kvm_memslots(kvm); |
| 2000 | int r; |
| 2001 | |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 2002 | BUG_ON(len > ghc->len); |
| 2003 | |
Gleb Natapov | e03b644 | 2011-07-11 15:28:11 -0400 | [diff] [blame] | 2004 | if (slots->generation != ghc->generation) |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 2005 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
| 2006 | |
| 2007 | if (unlikely(!ghc->memslot)) |
| 2008 | return kvm_read_guest(kvm, ghc->gpa, data, len); |
Gleb Natapov | e03b644 | 2011-07-11 15:28:11 -0400 | [diff] [blame] | 2009 | |
| 2010 | if (kvm_is_error_hva(ghc->hva)) |
| 2011 | return -EFAULT; |
| 2012 | |
| 2013 | r = __copy_from_user(data, (void __user *)ghc->hva, len); |
| 2014 | if (r) |
| 2015 | return -EFAULT; |
| 2016 | |
| 2017 | return 0; |
| 2018 | } |
| 2019 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); |
| 2020 | |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 2021 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
| 2022 | { |
Heiko Carstens | 8a3caa6 | 2013-11-18 10:35:55 +0100 | [diff] [blame] | 2023 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
| 2024 | |
| 2025 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 2026 | } |
| 2027 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); |
| 2028 | |
| 2029 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) |
| 2030 | { |
| 2031 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 2032 | int seg; |
| 2033 | int offset = offset_in_page(gpa); |
| 2034 | int ret; |
| 2035 | |
Kevin Mulvey | bfda0e8 | 2015-02-20 08:21:36 -0500 | [diff] [blame] | 2036 | while ((seg = next_segment(len, offset)) != 0) { |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 2037 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
| 2038 | if (ret < 0) |
| 2039 | return ret; |
| 2040 | offset = 0; |
| 2041 | len -= seg; |
| 2042 | ++gfn; |
| 2043 | } |
| 2044 | return 0; |
| 2045 | } |
| 2046 | EXPORT_SYMBOL_GPL(kvm_clear_guest); |
| 2047 | |
Paolo Bonzini | bc009e4 | 2015-05-26 12:43:41 +0200 | [diff] [blame] | 2048 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 2049 | gfn_t gfn) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2050 | { |
Rusty Russell | 7e9d619 | 2007-07-31 20:41:14 +1000 | [diff] [blame] | 2051 | if (memslot && memslot->dirty_bitmap) { |
| 2052 | unsigned long rel_gfn = gfn - memslot->base_gfn; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2053 | |
Takuya Yoshikawa | b74ca3b | 2012-10-04 17:13:12 -0700 | [diff] [blame] | 2054 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2055 | } |
| 2056 | } |
| 2057 | |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 2058 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
| 2059 | { |
| 2060 | struct kvm_memory_slot *memslot; |
| 2061 | |
| 2062 | memslot = gfn_to_memslot(kvm, gfn); |
Paolo Bonzini | bc009e4 | 2015-05-26 12:43:41 +0200 | [diff] [blame] | 2063 | mark_page_dirty_in_slot(memslot, gfn); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 2064 | } |
Aneesh Kumar K.V | 2ba9f0d | 2013-10-07 22:17:59 +0530 | [diff] [blame] | 2065 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 2066 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 2067 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 2068 | { |
| 2069 | struct kvm_memory_slot *memslot; |
| 2070 | |
| 2071 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 2072 | mark_page_dirty_in_slot(memslot, gfn); |
| 2073 | } |
| 2074 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); |
| 2075 | |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2076 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) |
| 2077 | { |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2078 | unsigned int old, val, grow; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2079 | |
Wanpeng Li | 2cbd782 | 2015-09-03 22:07:39 +0800 | [diff] [blame] | 2080 | old = val = vcpu->halt_poll_ns; |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2081 | grow = READ_ONCE(halt_poll_ns_grow); |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2082 | /* 10us base */ |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2083 | if (val == 0 && grow) |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2084 | val = 10000; |
| 2085 | else |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2086 | val *= grow; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2087 | |
David Matlack | 313f636 | 2016-03-08 16:19:44 -0800 | [diff] [blame] | 2088 | if (val > halt_poll_ns) |
| 2089 | val = halt_poll_ns; |
| 2090 | |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2091 | vcpu->halt_poll_ns = val; |
Wanpeng Li | 2cbd782 | 2015-09-03 22:07:39 +0800 | [diff] [blame] | 2092 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2093 | } |
| 2094 | |
| 2095 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) |
| 2096 | { |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2097 | unsigned int old, val, shrink; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2098 | |
Wanpeng Li | 2cbd782 | 2015-09-03 22:07:39 +0800 | [diff] [blame] | 2099 | old = val = vcpu->halt_poll_ns; |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2100 | shrink = READ_ONCE(halt_poll_ns_shrink); |
| 2101 | if (shrink == 0) |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2102 | val = 0; |
| 2103 | else |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2104 | val /= shrink; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2105 | |
| 2106 | vcpu->halt_poll_ns = val; |
Wanpeng Li | 2cbd782 | 2015-09-03 22:07:39 +0800 | [diff] [blame] | 2107 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2108 | } |
| 2109 | |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2110 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) |
| 2111 | { |
| 2112 | if (kvm_arch_vcpu_runnable(vcpu)) { |
| 2113 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
| 2114 | return -EINTR; |
| 2115 | } |
| 2116 | if (kvm_cpu_has_pending_timer(vcpu)) |
| 2117 | return -EINTR; |
| 2118 | if (signal_pending(current)) |
| 2119 | return -EINTR; |
| 2120 | |
| 2121 | return 0; |
| 2122 | } |
| 2123 | |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2124 | /* |
| 2125 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. |
| 2126 | */ |
Hollis Blanchard | 8776e51 | 2007-10-31 17:24:24 -0500 | [diff] [blame] | 2127 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2128 | { |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2129 | ktime_t start, cur; |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2130 | DECLARE_SWAITQUEUE(wait); |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2131 | bool waited = false; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2132 | u64 block_ns; |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2133 | |
| 2134 | start = cur = ktime_get(); |
Wanpeng Li | 19020f8 | 2015-09-03 22:07:37 +0800 | [diff] [blame] | 2135 | if (vcpu->halt_poll_ns) { |
| 2136 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 2137 | |
Paolo Bonzini | 62bea5b | 2015-09-15 18:27:57 +0200 | [diff] [blame] | 2138 | ++vcpu->stat.halt_attempted_poll; |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2139 | do { |
| 2140 | /* |
| 2141 | * This sets KVM_REQ_UNHALT if an interrupt |
| 2142 | * arrives. |
| 2143 | */ |
| 2144 | if (kvm_vcpu_check_block(vcpu) < 0) { |
| 2145 | ++vcpu->stat.halt_successful_poll; |
Christian Borntraeger | 3491caf | 2016-05-13 12:16:35 +0200 | [diff] [blame] | 2146 | if (!vcpu_valid_wakeup(vcpu)) |
| 2147 | ++vcpu->stat.halt_poll_invalid; |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2148 | goto out; |
| 2149 | } |
| 2150 | cur = ktime_get(); |
| 2151 | } while (single_task_running() && ktime_before(cur, stop)); |
| 2152 | } |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2153 | |
Christoffer Dall | 3217f7c | 2015-08-27 16:41:15 +0200 | [diff] [blame] | 2154 | kvm_arch_vcpu_blocking(vcpu); |
| 2155 | |
Marcelo Tosatti | e5c239c | 2008-05-08 19:47:01 -0300 | [diff] [blame] | 2156 | for (;;) { |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2157 | prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2158 | |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2159 | if (kvm_vcpu_check_block(vcpu) < 0) |
Marcelo Tosatti | e5c239c | 2008-05-08 19:47:01 -0300 | [diff] [blame] | 2160 | break; |
| 2161 | |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2162 | waited = true; |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2163 | schedule(); |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2164 | } |
| 2165 | |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2166 | finish_swait(&vcpu->wq, &wait); |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2167 | cur = ktime_get(); |
| 2168 | |
Christoffer Dall | 3217f7c | 2015-08-27 16:41:15 +0200 | [diff] [blame] | 2169 | kvm_arch_vcpu_unblocking(vcpu); |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2170 | out: |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2171 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); |
| 2172 | |
Christian Borntraeger | 2086d32 | 2016-05-17 10:49:22 +0200 | [diff] [blame] | 2173 | if (!vcpu_valid_wakeup(vcpu)) |
| 2174 | shrink_halt_poll_ns(vcpu); |
| 2175 | else if (halt_poll_ns) { |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2176 | if (block_ns <= vcpu->halt_poll_ns) |
| 2177 | ; |
| 2178 | /* we had a long block, shrink polling */ |
Christian Borntraeger | 2086d32 | 2016-05-17 10:49:22 +0200 | [diff] [blame] | 2179 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2180 | shrink_halt_poll_ns(vcpu); |
| 2181 | /* we had a short halt and our poll time is too small */ |
| 2182 | else if (vcpu->halt_poll_ns < halt_poll_ns && |
| 2183 | block_ns < halt_poll_ns) |
| 2184 | grow_halt_poll_ns(vcpu); |
Wanpeng Li | edb9272 | 2015-09-14 17:38:51 +0800 | [diff] [blame] | 2185 | } else |
| 2186 | vcpu->halt_poll_ns = 0; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2187 | |
Christian Borntraeger | 3491caf | 2016-05-13 12:16:35 +0200 | [diff] [blame] | 2188 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); |
| 2189 | kvm_arch_vcpu_block_finish(vcpu); |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2190 | } |
Aneesh Kumar K.V | 2ba9f0d | 2013-10-07 22:17:59 +0530 | [diff] [blame] | 2191 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2192 | |
Marcelo Tosatti | 8c84780 | 2012-03-14 17:58:48 -0300 | [diff] [blame] | 2193 | #ifndef CONFIG_S390 |
Radim Krčmář | dd1a4cc | 2016-05-04 14:09:44 -0500 | [diff] [blame] | 2194 | void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2195 | { |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2196 | struct swait_queue_head *wqp; |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2197 | |
| 2198 | wqp = kvm_arch_vcpu_wq(vcpu); |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2199 | if (swait_active(wqp)) { |
| 2200 | swake_up(wqp); |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2201 | ++vcpu->stat.halt_wakeup; |
| 2202 | } |
| 2203 | |
Radim Krčmář | dd1a4cc | 2016-05-04 14:09:44 -0500 | [diff] [blame] | 2204 | } |
| 2205 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); |
| 2206 | |
| 2207 | /* |
| 2208 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. |
| 2209 | */ |
| 2210 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) |
| 2211 | { |
| 2212 | int me; |
| 2213 | int cpu = vcpu->cpu; |
| 2214 | |
| 2215 | kvm_vcpu_wake_up(vcpu); |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2216 | me = get_cpu(); |
| 2217 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) |
| 2218 | if (kvm_arch_vcpu_should_kick(vcpu)) |
| 2219 | smp_send_reschedule(cpu); |
| 2220 | put_cpu(); |
| 2221 | } |
Yang Zhang | a20ed54 | 2013-04-11 19:25:15 +0800 | [diff] [blame] | 2222 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
Marcelo Tosatti | 8c84780 | 2012-03-14 17:58:48 -0300 | [diff] [blame] | 2223 | #endif /* !CONFIG_S390 */ |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2224 | |
Dan Carpenter | fa93384 | 2014-05-23 13:20:42 +0300 | [diff] [blame] | 2225 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2226 | { |
| 2227 | struct pid *pid; |
| 2228 | struct task_struct *task = NULL; |
Dan Carpenter | fa93384 | 2014-05-23 13:20:42 +0300 | [diff] [blame] | 2229 | int ret = 0; |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2230 | |
| 2231 | rcu_read_lock(); |
| 2232 | pid = rcu_dereference(target->pid); |
| 2233 | if (pid) |
Sam Bobroff | 27fbe64b | 2014-09-19 09:40:41 +1000 | [diff] [blame] | 2234 | task = get_pid_task(pid, PIDTYPE_PID); |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2235 | rcu_read_unlock(); |
| 2236 | if (!task) |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2237 | return ret; |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2238 | ret = yield_to(task, 1); |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2239 | put_task_struct(task); |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2240 | |
| 2241 | return ret; |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2242 | } |
| 2243 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); |
| 2244 | |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2245 | /* |
| 2246 | * Helper that checks whether a VCPU is eligible for directed yield. |
| 2247 | * Most eligible candidate to yield is decided by following heuristics: |
| 2248 | * |
| 2249 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently |
| 2250 | * (preempted lock holder), indicated by @in_spin_loop. |
| 2251 | * Set at the beiginning and cleared at the end of interception/PLE handler. |
| 2252 | * |
| 2253 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get |
| 2254 | * chance last time (mostly it has become eligible now since we have probably |
| 2255 | * yielded to lockholder in last iteration. This is done by toggling |
| 2256 | * @dy_eligible each time a VCPU checked for eligibility.) |
| 2257 | * |
| 2258 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding |
| 2259 | * to preempted lock-holder could result in wrong VCPU selection and CPU |
| 2260 | * burning. Giving priority for a potential lock-holder increases lock |
| 2261 | * progress. |
| 2262 | * |
| 2263 | * Since algorithm is based on heuristics, accessing another VCPU data without |
| 2264 | * locking does not harm. It may result in trying to yield to same VCPU, fail |
| 2265 | * and continue with next VCPU and so on. |
| 2266 | */ |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 2267 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2268 | { |
Scott Wood | 4a55dd7 | 2014-01-09 18:43:16 -0600 | [diff] [blame] | 2269 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2270 | bool eligible; |
| 2271 | |
| 2272 | eligible = !vcpu->spin_loop.in_spin_loop || |
Christian Borntraeger | 3465611 | 2014-09-04 21:13:31 +0200 | [diff] [blame] | 2273 | vcpu->spin_loop.dy_eligible; |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2274 | |
| 2275 | if (vcpu->spin_loop.in_spin_loop) |
| 2276 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); |
| 2277 | |
| 2278 | return eligible; |
Scott Wood | 4a55dd7 | 2014-01-09 18:43:16 -0600 | [diff] [blame] | 2279 | #else |
| 2280 | return true; |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2281 | #endif |
Scott Wood | 4a55dd7 | 2014-01-09 18:43:16 -0600 | [diff] [blame] | 2282 | } |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2283 | |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2284 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
Zhai, Edwin | d255f4f | 2009-10-09 18:03:20 +0800 | [diff] [blame] | 2285 | { |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2286 | struct kvm *kvm = me->kvm; |
| 2287 | struct kvm_vcpu *vcpu; |
| 2288 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; |
| 2289 | int yielded = 0; |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2290 | int try = 3; |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2291 | int pass; |
| 2292 | int i; |
Zhai, Edwin | d255f4f | 2009-10-09 18:03:20 +0800 | [diff] [blame] | 2293 | |
Raghavendra K T | 4c08849 | 2012-07-18 19:07:46 +0530 | [diff] [blame] | 2294 | kvm_vcpu_set_in_spin_loop(me, true); |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2295 | /* |
| 2296 | * We boost the priority of a VCPU that is runnable but not |
| 2297 | * currently running, because it got preempted by something |
| 2298 | * else and called schedule in __vcpu_run. Hopefully that |
| 2299 | * VCPU is holding the lock that we need and will release it. |
| 2300 | * We approximate round-robin by starting at the last boosted VCPU. |
| 2301 | */ |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2302 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2303 | kvm_for_each_vcpu(i, vcpu, kvm) { |
Rik van Riel | 5cfc2aa | 2012-06-19 16:51:04 -0400 | [diff] [blame] | 2304 | if (!pass && i <= last_boosted_vcpu) { |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2305 | i = last_boosted_vcpu; |
| 2306 | continue; |
| 2307 | } else if (pass && i > last_boosted_vcpu) |
| 2308 | break; |
Raghavendra K T | 7bc7ae2 | 2013-03-04 23:32:27 +0530 | [diff] [blame] | 2309 | if (!ACCESS_ONCE(vcpu->preempted)) |
| 2310 | continue; |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2311 | if (vcpu == me) |
| 2312 | continue; |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2313 | if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu)) |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2314 | continue; |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2315 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
| 2316 | continue; |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2317 | |
| 2318 | yielded = kvm_vcpu_yield_to(vcpu); |
| 2319 | if (yielded > 0) { |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2320 | kvm->last_boosted_vcpu = i; |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2321 | break; |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2322 | } else if (yielded < 0) { |
| 2323 | try--; |
| 2324 | if (!try) |
| 2325 | break; |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2326 | } |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2327 | } |
| 2328 | } |
Raghavendra K T | 4c08849 | 2012-07-18 19:07:46 +0530 | [diff] [blame] | 2329 | kvm_vcpu_set_in_spin_loop(me, false); |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2330 | |
| 2331 | /* Ensure vcpu is not eligible during next spinloop */ |
| 2332 | kvm_vcpu_set_dy_eligible(me, false); |
Zhai, Edwin | d255f4f | 2009-10-09 18:03:20 +0800 | [diff] [blame] | 2333 | } |
| 2334 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); |
| 2335 | |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2336 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2337 | { |
| 2338 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2339 | struct page *page; |
| 2340 | |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2341 | if (vmf->pgoff == 0) |
Avi Kivity | 039576c | 2007-03-20 12:46:50 +0200 | [diff] [blame] | 2342 | page = virt_to_page(vcpu->run); |
Avi Kivity | 0956676 | 2008-01-23 18:14:23 +0200 | [diff] [blame] | 2343 | #ifdef CONFIG_X86 |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2344 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2345 | page = virt_to_page(vcpu->arch.pio_data); |
Avi Kivity | 0956676 | 2008-01-23 18:14:23 +0200 | [diff] [blame] | 2346 | #endif |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2347 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 2348 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
| 2349 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); |
| 2350 | #endif |
Avi Kivity | 039576c | 2007-03-20 12:46:50 +0200 | [diff] [blame] | 2351 | else |
Carsten Otte | 5b1c149 | 2012-01-04 10:25:23 +0100 | [diff] [blame] | 2352 | return kvm_arch_vcpu_fault(vcpu, vmf); |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2353 | get_page(page); |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2354 | vmf->page = page; |
| 2355 | return 0; |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2356 | } |
| 2357 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 2358 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2359 | .fault = kvm_vcpu_fault, |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2360 | }; |
| 2361 | |
| 2362 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) |
| 2363 | { |
| 2364 | vma->vm_ops = &kvm_vcpu_vm_ops; |
| 2365 | return 0; |
| 2366 | } |
| 2367 | |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2368 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
| 2369 | { |
| 2370 | struct kvm_vcpu *vcpu = filp->private_data; |
| 2371 | |
Al Viro | 66c0b39 | 2008-04-19 20:33:56 +0100 | [diff] [blame] | 2372 | kvm_put_kvm(vcpu->kvm); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2373 | return 0; |
| 2374 | } |
| 2375 | |
Christian Borntraeger | 3d3aab1 | 2008-12-02 11:17:32 +0100 | [diff] [blame] | 2376 | static struct file_operations kvm_vcpu_fops = { |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2377 | .release = kvm_vcpu_release, |
| 2378 | .unlocked_ioctl = kvm_vcpu_ioctl, |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 2379 | #ifdef CONFIG_KVM_COMPAT |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2380 | .compat_ioctl = kvm_vcpu_compat_ioctl, |
| 2381 | #endif |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2382 | .mmap = kvm_vcpu_mmap, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2383 | .llseek = noop_llseek, |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2384 | }; |
| 2385 | |
| 2386 | /* |
| 2387 | * Allocates an inode for the vcpu. |
| 2388 | */ |
| 2389 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) |
| 2390 | { |
Yann Droneaud | 24009b0 | 2013-08-24 22:14:07 +0200 | [diff] [blame] | 2391 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2392 | } |
| 2393 | |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2394 | /* |
| 2395 | * Creates some virtual cpus. Good luck creating more than one. |
| 2396 | */ |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2397 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2398 | { |
| 2399 | int r; |
David Hildenbrand | e09fefd | 2015-11-05 09:03:50 +0100 | [diff] [blame] | 2400 | struct kvm_vcpu *vcpu; |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2401 | |
Greg Kurz | 0b1b1df | 2016-05-09 18:13:37 +0200 | [diff] [blame] | 2402 | if (id >= KVM_MAX_VCPU_ID) |
Andy Honig | 338c7db | 2013-11-18 16:09:22 -0800 | [diff] [blame] | 2403 | return -EINVAL; |
| 2404 | |
Paolo Bonzini | 6c7caeb | 2016-06-13 14:48:25 +0200 | [diff] [blame] | 2405 | mutex_lock(&kvm->lock); |
| 2406 | if (kvm->created_vcpus == KVM_MAX_VCPUS) { |
| 2407 | mutex_unlock(&kvm->lock); |
| 2408 | return -EINVAL; |
| 2409 | } |
| 2410 | |
| 2411 | kvm->created_vcpus++; |
| 2412 | mutex_unlock(&kvm->lock); |
| 2413 | |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2414 | vcpu = kvm_arch_vcpu_create(kvm, id); |
Paolo Bonzini | 6c7caeb | 2016-06-13 14:48:25 +0200 | [diff] [blame] | 2415 | if (IS_ERR(vcpu)) { |
| 2416 | r = PTR_ERR(vcpu); |
| 2417 | goto vcpu_decrement; |
| 2418 | } |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2419 | |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 2420 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
| 2421 | |
Avi Kivity | 26e5215 | 2007-11-20 15:30:24 +0200 | [diff] [blame] | 2422 | r = kvm_arch_vcpu_setup(vcpu); |
| 2423 | if (r) |
Jan Kiszka | d780592 | 2011-05-23 10:33:05 +0200 | [diff] [blame] | 2424 | goto vcpu_destroy; |
Avi Kivity | 26e5215 | 2007-11-20 15:30:24 +0200 | [diff] [blame] | 2425 | |
Shaohua Li | 11ec280 | 2007-07-23 14:51:37 +0800 | [diff] [blame] | 2426 | mutex_lock(&kvm->lock); |
David Hildenbrand | e09fefd | 2015-11-05 09:03:50 +0100 | [diff] [blame] | 2427 | if (kvm_get_vcpu_by_id(kvm, id)) { |
| 2428 | r = -EEXIST; |
| 2429 | goto unlock_vcpu_destroy; |
| 2430 | } |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2431 | |
| 2432 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 2433 | |
| 2434 | /* Now it's all set up, let userspace reach it */ |
Al Viro | 66c0b39 | 2008-04-19 20:33:56 +0100 | [diff] [blame] | 2435 | kvm_get_kvm(kvm); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2436 | r = create_vcpu_fd(vcpu); |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2437 | if (r < 0) { |
| 2438 | kvm_put_kvm(kvm); |
Jan Kiszka | d780592 | 2011-05-23 10:33:05 +0200 | [diff] [blame] | 2439 | goto unlock_vcpu_destroy; |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2440 | } |
| 2441 | |
| 2442 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; |
Paolo Bonzini | dd48924 | 2015-07-29 11:32:20 +0200 | [diff] [blame] | 2443 | |
| 2444 | /* |
| 2445 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus |
| 2446 | * before kvm->online_vcpu's incremented value. |
| 2447 | */ |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2448 | smp_wmb(); |
| 2449 | atomic_inc(&kvm->online_vcpus); |
| 2450 | |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2451 | mutex_unlock(&kvm->lock); |
Marcelo Tosatti | 42897d8 | 2012-11-27 23:29:02 -0200 | [diff] [blame] | 2452 | kvm_arch_vcpu_postcreate(vcpu); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2453 | return r; |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2454 | |
Jan Kiszka | d780592 | 2011-05-23 10:33:05 +0200 | [diff] [blame] | 2455 | unlock_vcpu_destroy: |
Glauber Costa | 7d8fece | 2008-09-17 23:16:59 -0300 | [diff] [blame] | 2456 | mutex_unlock(&kvm->lock); |
Jan Kiszka | d780592 | 2011-05-23 10:33:05 +0200 | [diff] [blame] | 2457 | vcpu_destroy: |
Hollis Blanchard | d40ccc6 | 2007-11-19 14:04:43 -0600 | [diff] [blame] | 2458 | kvm_arch_vcpu_destroy(vcpu); |
Paolo Bonzini | 6c7caeb | 2016-06-13 14:48:25 +0200 | [diff] [blame] | 2459 | vcpu_decrement: |
| 2460 | mutex_lock(&kvm->lock); |
| 2461 | kvm->created_vcpus--; |
| 2462 | mutex_unlock(&kvm->lock); |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2463 | return r; |
| 2464 | } |
| 2465 | |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2466 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
| 2467 | { |
| 2468 | if (sigset) { |
| 2469 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
| 2470 | vcpu->sigset_active = 1; |
| 2471 | vcpu->sigset = *sigset; |
| 2472 | } else |
| 2473 | vcpu->sigset_active = 0; |
| 2474 | return 0; |
| 2475 | } |
| 2476 | |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2477 | static long kvm_vcpu_ioctl(struct file *filp, |
| 2478 | unsigned int ioctl, unsigned long arg) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2479 | { |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2480 | struct kvm_vcpu *vcpu = filp->private_data; |
Al Viro | 2f366987 | 2007-02-09 16:38:35 +0000 | [diff] [blame] | 2481 | void __user *argp = (void __user *)arg; |
Carsten Otte | 313a3dc | 2007-10-11 19:16:52 +0200 | [diff] [blame] | 2482 | int r; |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2483 | struct kvm_fpu *fpu = NULL; |
| 2484 | struct kvm_sregs *kvm_sregs = NULL; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2485 | |
Avi Kivity | 6d4e4c4 | 2007-11-21 16:41:05 +0200 | [diff] [blame] | 2486 | if (vcpu->kvm->mm != current->mm) |
| 2487 | return -EIO; |
Avi Kivity | 2122ff5 | 2010-05-13 11:25:04 +0300 | [diff] [blame] | 2488 | |
David Matlack | 2ea75be | 2014-09-19 16:03:25 -0700 | [diff] [blame] | 2489 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
| 2490 | return -EINVAL; |
| 2491 | |
Sanjay Lal | 2f4d9b5 | 2012-11-21 18:34:15 -0800 | [diff] [blame] | 2492 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS) |
Avi Kivity | 2122ff5 | 2010-05-13 11:25:04 +0300 | [diff] [blame] | 2493 | /* |
| 2494 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, |
| 2495 | * so vcpu_load() would break it. |
| 2496 | */ |
Jens Freimann | 47b43c5 | 2014-11-11 20:57:06 +0100 | [diff] [blame] | 2497 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT) |
Avi Kivity | 2122ff5 | 2010-05-13 11:25:04 +0300 | [diff] [blame] | 2498 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
| 2499 | #endif |
| 2500 | |
| 2501 | |
Michael S. Tsirkin | 9fc7744 | 2012-09-16 11:50:30 +0300 | [diff] [blame] | 2502 | r = vcpu_load(vcpu); |
| 2503 | if (r) |
| 2504 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2505 | switch (ioctl) { |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2506 | case KVM_RUN: |
Avi Kivity | f0fe510 | 2007-03-07 13:11:17 +0200 | [diff] [blame] | 2507 | r = -EINVAL; |
| 2508 | if (arg) |
| 2509 | goto out; |
Christian Borntraeger | 7a72f7a | 2014-08-05 16:44:14 +0200 | [diff] [blame] | 2510 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
| 2511 | /* The thread running this VCPU changed. */ |
| 2512 | struct pid *oldpid = vcpu->pid; |
| 2513 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 2514 | |
Christian Borntraeger | 7a72f7a | 2014-08-05 16:44:14 +0200 | [diff] [blame] | 2515 | rcu_assign_pointer(vcpu->pid, newpid); |
| 2516 | if (oldpid) |
| 2517 | synchronize_rcu(); |
| 2518 | put_pid(oldpid); |
| 2519 | } |
Hollis Blanchard | b6c7a5d | 2007-11-01 14:16:10 -0500 | [diff] [blame] | 2520 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
Gleb Natapov | 64be500 | 2010-10-24 16:49:08 +0200 | [diff] [blame] | 2521 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2522 | break; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2523 | case KVM_GET_REGS: { |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2524 | struct kvm_regs *kvm_regs; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2525 | |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2526 | r = -ENOMEM; |
| 2527 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); |
| 2528 | if (!kvm_regs) |
| 2529 | goto out; |
| 2530 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2531 | if (r) |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2532 | goto out_free1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2533 | r = -EFAULT; |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2534 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
| 2535 | goto out_free1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2536 | r = 0; |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2537 | out_free1: |
| 2538 | kfree(kvm_regs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2539 | break; |
| 2540 | } |
| 2541 | case KVM_SET_REGS: { |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2542 | struct kvm_regs *kvm_regs; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2543 | |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2544 | r = -ENOMEM; |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2545 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
| 2546 | if (IS_ERR(kvm_regs)) { |
| 2547 | r = PTR_ERR(kvm_regs); |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2548 | goto out; |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2549 | } |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2550 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2551 | kfree(kvm_regs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2552 | break; |
| 2553 | } |
| 2554 | case KVM_GET_SREGS: { |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2555 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
| 2556 | r = -ENOMEM; |
| 2557 | if (!kvm_sregs) |
| 2558 | goto out; |
| 2559 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2560 | if (r) |
| 2561 | goto out; |
| 2562 | r = -EFAULT; |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2563 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2564 | goto out; |
| 2565 | r = 0; |
| 2566 | break; |
| 2567 | } |
| 2568 | case KVM_SET_SREGS: { |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2569 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
| 2570 | if (IS_ERR(kvm_sregs)) { |
| 2571 | r = PTR_ERR(kvm_sregs); |
Guo Chao | 1859541 | 2012-11-02 18:33:21 +0800 | [diff] [blame] | 2572 | kvm_sregs = NULL; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2573 | goto out; |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2574 | } |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2575 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2576 | break; |
| 2577 | } |
Marcelo Tosatti | 62d9f0d | 2008-04-11 13:24:45 -0300 | [diff] [blame] | 2578 | case KVM_GET_MP_STATE: { |
| 2579 | struct kvm_mp_state mp_state; |
| 2580 | |
| 2581 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); |
| 2582 | if (r) |
| 2583 | goto out; |
| 2584 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2585 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) |
Marcelo Tosatti | 62d9f0d | 2008-04-11 13:24:45 -0300 | [diff] [blame] | 2586 | goto out; |
| 2587 | r = 0; |
| 2588 | break; |
| 2589 | } |
| 2590 | case KVM_SET_MP_STATE: { |
| 2591 | struct kvm_mp_state mp_state; |
| 2592 | |
| 2593 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2594 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) |
Marcelo Tosatti | 62d9f0d | 2008-04-11 13:24:45 -0300 | [diff] [blame] | 2595 | goto out; |
| 2596 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); |
Marcelo Tosatti | 62d9f0d | 2008-04-11 13:24:45 -0300 | [diff] [blame] | 2597 | break; |
| 2598 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2599 | case KVM_TRANSLATE: { |
| 2600 | struct kvm_translation tr; |
| 2601 | |
| 2602 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2603 | if (copy_from_user(&tr, argp, sizeof(tr))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2604 | goto out; |
Zhang Xiantao | 8b00679 | 2007-11-16 13:05:55 +0800 | [diff] [blame] | 2605 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2606 | if (r) |
| 2607 | goto out; |
| 2608 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2609 | if (copy_to_user(argp, &tr, sizeof(tr))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2610 | goto out; |
| 2611 | r = 0; |
| 2612 | break; |
| 2613 | } |
Jan Kiszka | d0bfb94 | 2008-12-15 13:52:10 +0100 | [diff] [blame] | 2614 | case KVM_SET_GUEST_DEBUG: { |
| 2615 | struct kvm_guest_debug dbg; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2616 | |
| 2617 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2618 | if (copy_from_user(&dbg, argp, sizeof(dbg))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2619 | goto out; |
Jan Kiszka | d0bfb94 | 2008-12-15 13:52:10 +0100 | [diff] [blame] | 2620 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2621 | break; |
| 2622 | } |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2623 | case KVM_SET_SIGNAL_MASK: { |
| 2624 | struct kvm_signal_mask __user *sigmask_arg = argp; |
| 2625 | struct kvm_signal_mask kvm_sigmask; |
| 2626 | sigset_t sigset, *p; |
| 2627 | |
| 2628 | p = NULL; |
| 2629 | if (argp) { |
| 2630 | r = -EFAULT; |
| 2631 | if (copy_from_user(&kvm_sigmask, argp, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2632 | sizeof(kvm_sigmask))) |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2633 | goto out; |
| 2634 | r = -EINVAL; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2635 | if (kvm_sigmask.len != sizeof(sigset)) |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2636 | goto out; |
| 2637 | r = -EFAULT; |
| 2638 | if (copy_from_user(&sigset, sigmask_arg->sigset, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2639 | sizeof(sigset))) |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2640 | goto out; |
| 2641 | p = &sigset; |
| 2642 | } |
Andi Kleen | 376d41f | 2010-06-10 13:10:47 +0200 | [diff] [blame] | 2643 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2644 | break; |
| 2645 | } |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2646 | case KVM_GET_FPU: { |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2647 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
| 2648 | r = -ENOMEM; |
| 2649 | if (!fpu) |
| 2650 | goto out; |
| 2651 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2652 | if (r) |
| 2653 | goto out; |
| 2654 | r = -EFAULT; |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2655 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2656 | goto out; |
| 2657 | r = 0; |
| 2658 | break; |
| 2659 | } |
| 2660 | case KVM_SET_FPU: { |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2661 | fpu = memdup_user(argp, sizeof(*fpu)); |
| 2662 | if (IS_ERR(fpu)) { |
| 2663 | r = PTR_ERR(fpu); |
Guo Chao | 1859541 | 2012-11-02 18:33:21 +0800 | [diff] [blame] | 2664 | fpu = NULL; |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2665 | goto out; |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2666 | } |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2667 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2668 | break; |
| 2669 | } |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2670 | default: |
Carsten Otte | 313a3dc | 2007-10-11 19:16:52 +0200 | [diff] [blame] | 2671 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2672 | } |
| 2673 | out: |
Avi Kivity | 2122ff5 | 2010-05-13 11:25:04 +0300 | [diff] [blame] | 2674 | vcpu_put(vcpu); |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2675 | kfree(fpu); |
| 2676 | kfree(kvm_sregs); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2677 | return r; |
| 2678 | } |
| 2679 | |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 2680 | #ifdef CONFIG_KVM_COMPAT |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2681 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
| 2682 | unsigned int ioctl, unsigned long arg) |
| 2683 | { |
| 2684 | struct kvm_vcpu *vcpu = filp->private_data; |
| 2685 | void __user *argp = compat_ptr(arg); |
| 2686 | int r; |
| 2687 | |
| 2688 | if (vcpu->kvm->mm != current->mm) |
| 2689 | return -EIO; |
| 2690 | |
| 2691 | switch (ioctl) { |
| 2692 | case KVM_SET_SIGNAL_MASK: { |
| 2693 | struct kvm_signal_mask __user *sigmask_arg = argp; |
| 2694 | struct kvm_signal_mask kvm_sigmask; |
| 2695 | compat_sigset_t csigset; |
| 2696 | sigset_t sigset; |
| 2697 | |
| 2698 | if (argp) { |
| 2699 | r = -EFAULT; |
| 2700 | if (copy_from_user(&kvm_sigmask, argp, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2701 | sizeof(kvm_sigmask))) |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2702 | goto out; |
| 2703 | r = -EINVAL; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2704 | if (kvm_sigmask.len != sizeof(csigset)) |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2705 | goto out; |
| 2706 | r = -EFAULT; |
| 2707 | if (copy_from_user(&csigset, sigmask_arg->sigset, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2708 | sizeof(csigset))) |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2709 | goto out; |
Alan Cox | 760a9a3 | 2012-08-22 14:34:11 +0100 | [diff] [blame] | 2710 | sigset_from_compat(&sigset, &csigset); |
| 2711 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
| 2712 | } else |
| 2713 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2714 | break; |
| 2715 | } |
| 2716 | default: |
| 2717 | r = kvm_vcpu_ioctl(filp, ioctl, arg); |
| 2718 | } |
| 2719 | |
| 2720 | out: |
| 2721 | return r; |
| 2722 | } |
| 2723 | #endif |
| 2724 | |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2725 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
| 2726 | int (*accessor)(struct kvm_device *dev, |
| 2727 | struct kvm_device_attr *attr), |
| 2728 | unsigned long arg) |
| 2729 | { |
| 2730 | struct kvm_device_attr attr; |
| 2731 | |
| 2732 | if (!accessor) |
| 2733 | return -EPERM; |
| 2734 | |
| 2735 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) |
| 2736 | return -EFAULT; |
| 2737 | |
| 2738 | return accessor(dev, &attr); |
| 2739 | } |
| 2740 | |
| 2741 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, |
| 2742 | unsigned long arg) |
| 2743 | { |
| 2744 | struct kvm_device *dev = filp->private_data; |
| 2745 | |
| 2746 | switch (ioctl) { |
| 2747 | case KVM_SET_DEVICE_ATTR: |
| 2748 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); |
| 2749 | case KVM_GET_DEVICE_ATTR: |
| 2750 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); |
| 2751 | case KVM_HAS_DEVICE_ATTR: |
| 2752 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); |
| 2753 | default: |
| 2754 | if (dev->ops->ioctl) |
| 2755 | return dev->ops->ioctl(dev, ioctl, arg); |
| 2756 | |
| 2757 | return -ENOTTY; |
| 2758 | } |
| 2759 | } |
| 2760 | |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2761 | static int kvm_device_release(struct inode *inode, struct file *filp) |
| 2762 | { |
| 2763 | struct kvm_device *dev = filp->private_data; |
| 2764 | struct kvm *kvm = dev->kvm; |
| 2765 | |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2766 | kvm_put_kvm(kvm); |
| 2767 | return 0; |
| 2768 | } |
| 2769 | |
| 2770 | static const struct file_operations kvm_device_fops = { |
| 2771 | .unlocked_ioctl = kvm_device_ioctl, |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 2772 | #ifdef CONFIG_KVM_COMPAT |
Scott Wood | db6ae61 | 2013-04-30 20:00:45 -0500 | [diff] [blame] | 2773 | .compat_ioctl = kvm_device_ioctl, |
| 2774 | #endif |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2775 | .release = kvm_device_release, |
| 2776 | }; |
| 2777 | |
| 2778 | struct kvm_device *kvm_device_from_filp(struct file *filp) |
| 2779 | { |
| 2780 | if (filp->f_op != &kvm_device_fops) |
| 2781 | return NULL; |
| 2782 | |
| 2783 | return filp->private_data; |
| 2784 | } |
| 2785 | |
Will Deacon | d60eacb | 2014-09-02 10:27:33 +0100 | [diff] [blame] | 2786 | static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
| 2787 | #ifdef CONFIG_KVM_MPIC |
| 2788 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
| 2789 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, |
| 2790 | #endif |
| 2791 | |
| 2792 | #ifdef CONFIG_KVM_XICS |
| 2793 | [KVM_DEV_TYPE_XICS] = &kvm_xics_ops, |
| 2794 | #endif |
Will Deacon | d60eacb | 2014-09-02 10:27:33 +0100 | [diff] [blame] | 2795 | }; |
| 2796 | |
| 2797 | int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type) |
| 2798 | { |
| 2799 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) |
| 2800 | return -ENOSPC; |
| 2801 | |
| 2802 | if (kvm_device_ops_table[type] != NULL) |
| 2803 | return -EEXIST; |
| 2804 | |
| 2805 | kvm_device_ops_table[type] = ops; |
| 2806 | return 0; |
| 2807 | } |
| 2808 | |
Wanpeng Li | 571ee1b | 2014-10-09 18:30:08 +0800 | [diff] [blame] | 2809 | void kvm_unregister_device_ops(u32 type) |
| 2810 | { |
| 2811 | if (kvm_device_ops_table[type] != NULL) |
| 2812 | kvm_device_ops_table[type] = NULL; |
| 2813 | } |
| 2814 | |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2815 | static int kvm_ioctl_create_device(struct kvm *kvm, |
| 2816 | struct kvm_create_device *cd) |
| 2817 | { |
| 2818 | struct kvm_device_ops *ops = NULL; |
| 2819 | struct kvm_device *dev; |
| 2820 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; |
| 2821 | int ret; |
| 2822 | |
Will Deacon | d60eacb | 2014-09-02 10:27:33 +0100 | [diff] [blame] | 2823 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2824 | return -ENODEV; |
Will Deacon | d60eacb | 2014-09-02 10:27:33 +0100 | [diff] [blame] | 2825 | |
| 2826 | ops = kvm_device_ops_table[cd->type]; |
| 2827 | if (ops == NULL) |
| 2828 | return -ENODEV; |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2829 | |
| 2830 | if (test) |
| 2831 | return 0; |
| 2832 | |
| 2833 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 2834 | if (!dev) |
| 2835 | return -ENOMEM; |
| 2836 | |
| 2837 | dev->ops = ops; |
| 2838 | dev->kvm = kvm; |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2839 | |
Christoffer Dall | a28ebea | 2016-08-09 19:13:01 +0200 | [diff] [blame] | 2840 | mutex_lock(&kvm->lock); |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2841 | ret = ops->create(dev, cd->type); |
| 2842 | if (ret < 0) { |
Christoffer Dall | a28ebea | 2016-08-09 19:13:01 +0200 | [diff] [blame] | 2843 | mutex_unlock(&kvm->lock); |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2844 | kfree(dev); |
| 2845 | return ret; |
| 2846 | } |
Christoffer Dall | a28ebea | 2016-08-09 19:13:01 +0200 | [diff] [blame] | 2847 | list_add(&dev->vm_node, &kvm->devices); |
| 2848 | mutex_unlock(&kvm->lock); |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2849 | |
Christoffer Dall | 023e9fd | 2016-08-09 19:13:00 +0200 | [diff] [blame] | 2850 | if (ops->init) |
| 2851 | ops->init(dev); |
| 2852 | |
Yann Droneaud | 24009b0 | 2013-08-24 22:14:07 +0200 | [diff] [blame] | 2853 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2854 | if (ret < 0) { |
| 2855 | ops->destroy(dev); |
Christoffer Dall | a28ebea | 2016-08-09 19:13:01 +0200 | [diff] [blame] | 2856 | mutex_lock(&kvm->lock); |
| 2857 | list_del(&dev->vm_node); |
| 2858 | mutex_unlock(&kvm->lock); |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2859 | return ret; |
| 2860 | } |
| 2861 | |
| 2862 | kvm_get_kvm(kvm); |
| 2863 | cd->fd = ret; |
| 2864 | return 0; |
| 2865 | } |
| 2866 | |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2867 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
| 2868 | { |
| 2869 | switch (arg) { |
| 2870 | case KVM_CAP_USER_MEMORY: |
| 2871 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
| 2872 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2873 | case KVM_CAP_INTERNAL_ERROR_DATA: |
| 2874 | #ifdef CONFIG_HAVE_KVM_MSI |
| 2875 | case KVM_CAP_SIGNAL_MSI: |
| 2876 | #endif |
Paul Mackerras | 297e210 | 2014-06-30 20:51:13 +1000 | [diff] [blame] | 2877 | #ifdef CONFIG_HAVE_KVM_IRQFD |
Paolo Bonzini | dc9be0f | 2015-03-05 11:54:46 +0100 | [diff] [blame] | 2878 | case KVM_CAP_IRQFD: |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2879 | case KVM_CAP_IRQFD_RESAMPLE: |
| 2880 | #endif |
Jason Wang | e9ea506 | 2015-09-15 14:41:59 +0800 | [diff] [blame] | 2881 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2882 | case KVM_CAP_CHECK_EXTENSION_VM: |
| 2883 | return 1; |
| 2884 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
| 2885 | case KVM_CAP_IRQ_ROUTING: |
| 2886 | return KVM_MAX_IRQ_ROUTES; |
| 2887 | #endif |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 2888 | #if KVM_ADDRESS_SPACE_NUM > 1 |
| 2889 | case KVM_CAP_MULTI_ADDRESS_SPACE: |
| 2890 | return KVM_ADDRESS_SPACE_NUM; |
| 2891 | #endif |
Greg Kurz | 0b1b1df | 2016-05-09 18:13:37 +0200 | [diff] [blame] | 2892 | case KVM_CAP_MAX_VCPU_ID: |
| 2893 | return KVM_MAX_VCPU_ID; |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2894 | default: |
| 2895 | break; |
| 2896 | } |
| 2897 | return kvm_vm_ioctl_check_extension(kvm, arg); |
| 2898 | } |
| 2899 | |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2900 | static long kvm_vm_ioctl(struct file *filp, |
| 2901 | unsigned int ioctl, unsigned long arg) |
| 2902 | { |
| 2903 | struct kvm *kvm = filp->private_data; |
| 2904 | void __user *argp = (void __user *)arg; |
Carsten Otte | 1fe779f | 2007-10-29 16:08:35 +0100 | [diff] [blame] | 2905 | int r; |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2906 | |
Avi Kivity | 6d4e4c4 | 2007-11-21 16:41:05 +0200 | [diff] [blame] | 2907 | if (kvm->mm != current->mm) |
| 2908 | return -EIO; |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2909 | switch (ioctl) { |
| 2910 | case KVM_CREATE_VCPU: |
| 2911 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2912 | break; |
Izik Eidus | 6fc138d | 2007-10-09 19:20:39 +0200 | [diff] [blame] | 2913 | case KVM_SET_USER_MEMORY_REGION: { |
| 2914 | struct kvm_userspace_memory_region kvm_userspace_mem; |
| 2915 | |
| 2916 | r = -EFAULT; |
| 2917 | if (copy_from_user(&kvm_userspace_mem, argp, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2918 | sizeof(kvm_userspace_mem))) |
Izik Eidus | 6fc138d | 2007-10-09 19:20:39 +0200 | [diff] [blame] | 2919 | goto out; |
| 2920 | |
Takuya Yoshikawa | 47ae31e | 2013-02-27 19:43:00 +0900 | [diff] [blame] | 2921 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2922 | break; |
| 2923 | } |
| 2924 | case KVM_GET_DIRTY_LOG: { |
| 2925 | struct kvm_dirty_log log; |
| 2926 | |
| 2927 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2928 | if (copy_from_user(&log, argp, sizeof(log))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2929 | goto out; |
Avi Kivity | 2c6f5df | 2007-02-20 18:27:58 +0200 | [diff] [blame] | 2930 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2931 | break; |
| 2932 | } |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2933 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 2934 | case KVM_REGISTER_COALESCED_MMIO: { |
| 2935 | struct kvm_coalesced_mmio_zone zone; |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 2936 | |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2937 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2938 | if (copy_from_user(&zone, argp, sizeof(zone))) |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2939 | goto out; |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2940 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2941 | break; |
| 2942 | } |
| 2943 | case KVM_UNREGISTER_COALESCED_MMIO: { |
| 2944 | struct kvm_coalesced_mmio_zone zone; |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 2945 | |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2946 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2947 | if (copy_from_user(&zone, argp, sizeof(zone))) |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2948 | goto out; |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2949 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2950 | break; |
| 2951 | } |
| 2952 | #endif |
Gregory Haskins | 721eecb | 2009-05-20 10:30:49 -0400 | [diff] [blame] | 2953 | case KVM_IRQFD: { |
| 2954 | struct kvm_irqfd data; |
| 2955 | |
| 2956 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2957 | if (copy_from_user(&data, argp, sizeof(data))) |
Gregory Haskins | 721eecb | 2009-05-20 10:30:49 -0400 | [diff] [blame] | 2958 | goto out; |
Alex Williamson | d4db293 | 2012-06-29 09:56:08 -0600 | [diff] [blame] | 2959 | r = kvm_irqfd(kvm, &data); |
Gregory Haskins | 721eecb | 2009-05-20 10:30:49 -0400 | [diff] [blame] | 2960 | break; |
| 2961 | } |
Gregory Haskins | d34e6b1 | 2009-07-07 17:08:49 -0400 | [diff] [blame] | 2962 | case KVM_IOEVENTFD: { |
| 2963 | struct kvm_ioeventfd data; |
| 2964 | |
| 2965 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2966 | if (copy_from_user(&data, argp, sizeof(data))) |
Gregory Haskins | d34e6b1 | 2009-07-07 17:08:49 -0400 | [diff] [blame] | 2967 | goto out; |
| 2968 | r = kvm_ioeventfd(kvm, &data); |
| 2969 | break; |
| 2970 | } |
Jan Kiszka | 07975ad | 2012-03-29 21:14:12 +0200 | [diff] [blame] | 2971 | #ifdef CONFIG_HAVE_KVM_MSI |
| 2972 | case KVM_SIGNAL_MSI: { |
| 2973 | struct kvm_msi msi; |
| 2974 | |
| 2975 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2976 | if (copy_from_user(&msi, argp, sizeof(msi))) |
Jan Kiszka | 07975ad | 2012-03-29 21:14:12 +0200 | [diff] [blame] | 2977 | goto out; |
| 2978 | r = kvm_send_userspace_msi(kvm, &msi); |
| 2979 | break; |
| 2980 | } |
| 2981 | #endif |
Christoffer Dall | 23d43cf | 2012-07-24 08:51:20 -0400 | [diff] [blame] | 2982 | #ifdef __KVM_HAVE_IRQ_LINE |
| 2983 | case KVM_IRQ_LINE_STATUS: |
| 2984 | case KVM_IRQ_LINE: { |
| 2985 | struct kvm_irq_level irq_event; |
| 2986 | |
| 2987 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2988 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) |
Christoffer Dall | 23d43cf | 2012-07-24 08:51:20 -0400 | [diff] [blame] | 2989 | goto out; |
| 2990 | |
Yang Zhang | aa2fbe6 | 2013-04-11 19:21:40 +0800 | [diff] [blame] | 2991 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
| 2992 | ioctl == KVM_IRQ_LINE_STATUS); |
Christoffer Dall | 23d43cf | 2012-07-24 08:51:20 -0400 | [diff] [blame] | 2993 | if (r) |
| 2994 | goto out; |
| 2995 | |
| 2996 | r = -EFAULT; |
| 2997 | if (ioctl == KVM_IRQ_LINE_STATUS) { |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2998 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) |
Christoffer Dall | 23d43cf | 2012-07-24 08:51:20 -0400 | [diff] [blame] | 2999 | goto out; |
| 3000 | } |
| 3001 | |
| 3002 | r = 0; |
| 3003 | break; |
| 3004 | } |
| 3005 | #endif |
Alexander Graf | aa8d594 | 2013-04-15 21:12:53 +0200 | [diff] [blame] | 3006 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
| 3007 | case KVM_SET_GSI_ROUTING: { |
| 3008 | struct kvm_irq_routing routing; |
| 3009 | struct kvm_irq_routing __user *urouting; |
Paolo Bonzini | f8c1b85 | 2016-06-01 14:09:22 +0200 | [diff] [blame] | 3010 | struct kvm_irq_routing_entry *entries = NULL; |
Alexander Graf | aa8d594 | 2013-04-15 21:12:53 +0200 | [diff] [blame] | 3011 | |
| 3012 | r = -EFAULT; |
| 3013 | if (copy_from_user(&routing, argp, sizeof(routing))) |
| 3014 | goto out; |
| 3015 | r = -EINVAL; |
Xiubo Li | caf1ff2 | 2016-06-15 18:00:33 +0800 | [diff] [blame] | 3016 | if (routing.nr > KVM_MAX_IRQ_ROUTES) |
Alexander Graf | aa8d594 | 2013-04-15 21:12:53 +0200 | [diff] [blame] | 3017 | goto out; |
| 3018 | if (routing.flags) |
| 3019 | goto out; |
Paolo Bonzini | f8c1b85 | 2016-06-01 14:09:22 +0200 | [diff] [blame] | 3020 | if (routing.nr) { |
| 3021 | r = -ENOMEM; |
| 3022 | entries = vmalloc(routing.nr * sizeof(*entries)); |
| 3023 | if (!entries) |
| 3024 | goto out; |
| 3025 | r = -EFAULT; |
| 3026 | urouting = argp; |
| 3027 | if (copy_from_user(entries, urouting->entries, |
| 3028 | routing.nr * sizeof(*entries))) |
| 3029 | goto out_free_irq_routing; |
| 3030 | } |
Alexander Graf | aa8d594 | 2013-04-15 21:12:53 +0200 | [diff] [blame] | 3031 | r = kvm_set_irq_routing(kvm, entries, routing.nr, |
| 3032 | routing.flags); |
Xiubo Li | a642a17 | 2015-02-26 14:58:20 +0800 | [diff] [blame] | 3033 | out_free_irq_routing: |
Alexander Graf | aa8d594 | 2013-04-15 21:12:53 +0200 | [diff] [blame] | 3034 | vfree(entries); |
| 3035 | break; |
| 3036 | } |
| 3037 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 3038 | case KVM_CREATE_DEVICE: { |
| 3039 | struct kvm_create_device cd; |
| 3040 | |
| 3041 | r = -EFAULT; |
| 3042 | if (copy_from_user(&cd, argp, sizeof(cd))) |
| 3043 | goto out; |
| 3044 | |
| 3045 | r = kvm_ioctl_create_device(kvm, &cd); |
| 3046 | if (r) |
| 3047 | goto out; |
| 3048 | |
| 3049 | r = -EFAULT; |
| 3050 | if (copy_to_user(argp, &cd, sizeof(cd))) |
| 3051 | goto out; |
| 3052 | |
| 3053 | r = 0; |
| 3054 | break; |
| 3055 | } |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 3056 | case KVM_CHECK_EXTENSION: |
| 3057 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); |
| 3058 | break; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3059 | default: |
Carsten Otte | 1fe779f | 2007-10-29 16:08:35 +0100 | [diff] [blame] | 3060 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3061 | } |
| 3062 | out: |
| 3063 | return r; |
| 3064 | } |
| 3065 | |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 3066 | #ifdef CONFIG_KVM_COMPAT |
Arnd Bergmann | 6ff5894 | 2009-10-22 14:19:27 +0200 | [diff] [blame] | 3067 | struct compat_kvm_dirty_log { |
| 3068 | __u32 slot; |
| 3069 | __u32 padding1; |
| 3070 | union { |
| 3071 | compat_uptr_t dirty_bitmap; /* one bit per page */ |
| 3072 | __u64 padding2; |
| 3073 | }; |
| 3074 | }; |
| 3075 | |
| 3076 | static long kvm_vm_compat_ioctl(struct file *filp, |
| 3077 | unsigned int ioctl, unsigned long arg) |
| 3078 | { |
| 3079 | struct kvm *kvm = filp->private_data; |
| 3080 | int r; |
| 3081 | |
| 3082 | if (kvm->mm != current->mm) |
| 3083 | return -EIO; |
| 3084 | switch (ioctl) { |
| 3085 | case KVM_GET_DIRTY_LOG: { |
| 3086 | struct compat_kvm_dirty_log compat_log; |
| 3087 | struct kvm_dirty_log log; |
| 3088 | |
| 3089 | r = -EFAULT; |
| 3090 | if (copy_from_user(&compat_log, (void __user *)arg, |
| 3091 | sizeof(compat_log))) |
| 3092 | goto out; |
| 3093 | log.slot = compat_log.slot; |
| 3094 | log.padding1 = compat_log.padding1; |
| 3095 | log.padding2 = compat_log.padding2; |
| 3096 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); |
| 3097 | |
| 3098 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
Arnd Bergmann | 6ff5894 | 2009-10-22 14:19:27 +0200 | [diff] [blame] | 3099 | break; |
| 3100 | } |
| 3101 | default: |
| 3102 | r = kvm_vm_ioctl(filp, ioctl, arg); |
| 3103 | } |
| 3104 | |
| 3105 | out: |
| 3106 | return r; |
| 3107 | } |
| 3108 | #endif |
| 3109 | |
Christian Borntraeger | 3d3aab1 | 2008-12-02 11:17:32 +0100 | [diff] [blame] | 3110 | static struct file_operations kvm_vm_fops = { |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3111 | .release = kvm_vm_release, |
| 3112 | .unlocked_ioctl = kvm_vm_ioctl, |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 3113 | #ifdef CONFIG_KVM_COMPAT |
Arnd Bergmann | 6ff5894 | 2009-10-22 14:19:27 +0200 | [diff] [blame] | 3114 | .compat_ioctl = kvm_vm_compat_ioctl, |
| 3115 | #endif |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3116 | .llseek = noop_llseek, |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3117 | }; |
| 3118 | |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 3119 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3120 | { |
Heiko Carstens | aac8763 | 2010-10-27 17:22:10 +0200 | [diff] [blame] | 3121 | int r; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3122 | struct kvm *kvm; |
Al Viro | 506cfba | 2016-07-14 18:54:17 +0200 | [diff] [blame] | 3123 | struct file *file; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3124 | |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 3125 | kvm = kvm_create_vm(type); |
Avi Kivity | d6d2816 | 2007-06-28 08:38:16 -0400 | [diff] [blame] | 3126 | if (IS_ERR(kvm)) |
| 3127 | return PTR_ERR(kvm); |
Takuya Yoshikawa | 6ce5a09 | 2010-03-15 22:13:30 +0900 | [diff] [blame] | 3128 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 3129 | r = kvm_coalesced_mmio_init(kvm); |
| 3130 | if (r < 0) { |
| 3131 | kvm_put_kvm(kvm); |
| 3132 | return r; |
| 3133 | } |
| 3134 | #endif |
Al Viro | 506cfba | 2016-07-14 18:54:17 +0200 | [diff] [blame] | 3135 | r = get_unused_fd_flags(O_CLOEXEC); |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3136 | if (r < 0) { |
Al Viro | 66c0b39 | 2008-04-19 20:33:56 +0100 | [diff] [blame] | 3137 | kvm_put_kvm(kvm); |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3138 | return r; |
| 3139 | } |
Al Viro | 506cfba | 2016-07-14 18:54:17 +0200 | [diff] [blame] | 3140 | file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
| 3141 | if (IS_ERR(file)) { |
| 3142 | put_unused_fd(r); |
| 3143 | kvm_put_kvm(kvm); |
| 3144 | return PTR_ERR(file); |
| 3145 | } |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3146 | |
| 3147 | if (kvm_create_vm_debugfs(kvm, r) < 0) { |
Al Viro | 506cfba | 2016-07-14 18:54:17 +0200 | [diff] [blame] | 3148 | put_unused_fd(r); |
| 3149 | fput(file); |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3150 | return -ENOMEM; |
| 3151 | } |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3152 | |
Al Viro | 506cfba | 2016-07-14 18:54:17 +0200 | [diff] [blame] | 3153 | fd_install(r, file); |
Heiko Carstens | aac8763 | 2010-10-27 17:22:10 +0200 | [diff] [blame] | 3154 | return r; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3155 | } |
| 3156 | |
| 3157 | static long kvm_dev_ioctl(struct file *filp, |
| 3158 | unsigned int ioctl, unsigned long arg) |
| 3159 | { |
Avi Kivity | 07c45a3 | 2007-03-07 13:05:38 +0200 | [diff] [blame] | 3160 | long r = -EINVAL; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3161 | |
| 3162 | switch (ioctl) { |
| 3163 | case KVM_GET_API_VERSION: |
Avi Kivity | f0fe510 | 2007-03-07 13:11:17 +0200 | [diff] [blame] | 3164 | if (arg) |
| 3165 | goto out; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3166 | r = KVM_API_VERSION; |
| 3167 | break; |
| 3168 | case KVM_CREATE_VM: |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 3169 | r = kvm_dev_ioctl_create_vm(arg); |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3170 | break; |
Zhang Xiantao | 018d00d | 2007-11-15 23:07:47 +0800 | [diff] [blame] | 3171 | case KVM_CHECK_EXTENSION: |
Alexander Graf | 784aa3d | 2014-07-14 18:27:35 +0200 | [diff] [blame] | 3172 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
Avi Kivity | 5d308f4 | 2007-03-01 17:56:20 +0200 | [diff] [blame] | 3173 | break; |
Avi Kivity | 07c45a3 | 2007-03-07 13:05:38 +0200 | [diff] [blame] | 3174 | case KVM_GET_VCPU_MMAP_SIZE: |
Avi Kivity | 07c45a3 | 2007-03-07 13:05:38 +0200 | [diff] [blame] | 3175 | if (arg) |
| 3176 | goto out; |
Avi Kivity | adb1ff4 | 2008-01-24 15:13:08 +0200 | [diff] [blame] | 3177 | r = PAGE_SIZE; /* struct kvm_run */ |
| 3178 | #ifdef CONFIG_X86 |
| 3179 | r += PAGE_SIZE; /* pio data page */ |
| 3180 | #endif |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 3181 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 3182 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
| 3183 | #endif |
Avi Kivity | 07c45a3 | 2007-03-07 13:05:38 +0200 | [diff] [blame] | 3184 | break; |
Feng(Eric) Liu | d4c9ff2 | 2008-04-10 08:47:53 -0400 | [diff] [blame] | 3185 | case KVM_TRACE_ENABLE: |
| 3186 | case KVM_TRACE_PAUSE: |
| 3187 | case KVM_TRACE_DISABLE: |
Marcelo Tosatti | 2023a29 | 2009-06-18 11:47:28 -0300 | [diff] [blame] | 3188 | r = -EOPNOTSUPP; |
Feng(Eric) Liu | d4c9ff2 | 2008-04-10 08:47:53 -0400 | [diff] [blame] | 3189 | break; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3190 | default: |
Carsten Otte | 043405e | 2007-10-10 17:16:19 +0200 | [diff] [blame] | 3191 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3192 | } |
| 3193 | out: |
| 3194 | return r; |
| 3195 | } |
| 3196 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3197 | static struct file_operations kvm_chardev_ops = { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3198 | .unlocked_ioctl = kvm_dev_ioctl, |
| 3199 | .compat_ioctl = kvm_dev_ioctl, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3200 | .llseek = noop_llseek, |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3201 | }; |
| 3202 | |
| 3203 | static struct miscdevice kvm_dev = { |
Avi Kivity | bbe4432 | 2007-03-04 13:27:36 +0200 | [diff] [blame] | 3204 | KVM_MINOR, |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3205 | "kvm", |
| 3206 | &kvm_chardev_ops, |
| 3207 | }; |
| 3208 | |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3209 | static void hardware_enable_nolock(void *junk) |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3210 | { |
| 3211 | int cpu = raw_smp_processor_id(); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3212 | int r; |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3213 | |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3214 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3215 | return; |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3216 | |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3217 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3218 | |
Radim Krčmář | 13a34e0 | 2014-08-28 15:13:03 +0200 | [diff] [blame] | 3219 | r = kvm_arch_hardware_enable(); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3220 | |
| 3221 | if (r) { |
| 3222 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
| 3223 | atomic_inc(&hardware_enable_failed); |
Xiubo Li | 1170adc | 2015-02-26 14:58:26 +0800 | [diff] [blame] | 3224 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3225 | } |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3226 | } |
| 3227 | |
Thomas Gleixner | 8c18b2d | 2016-07-13 17:16:37 +0000 | [diff] [blame] | 3228 | static int kvm_starting_cpu(unsigned int cpu) |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3229 | { |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3230 | raw_spin_lock(&kvm_count_lock); |
Paolo Bonzini | 4fa92fb | 2013-09-10 12:57:17 +0200 | [diff] [blame] | 3231 | if (kvm_usage_count) |
| 3232 | hardware_enable_nolock(NULL); |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3233 | raw_spin_unlock(&kvm_count_lock); |
Thomas Gleixner | 8c18b2d | 2016-07-13 17:16:37 +0000 | [diff] [blame] | 3234 | return 0; |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3235 | } |
| 3236 | |
| 3237 | static void hardware_disable_nolock(void *junk) |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3238 | { |
| 3239 | int cpu = raw_smp_processor_id(); |
| 3240 | |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3241 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3242 | return; |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3243 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
Radim Krčmář | 13a34e0 | 2014-08-28 15:13:03 +0200 | [diff] [blame] | 3244 | kvm_arch_hardware_disable(); |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3245 | } |
| 3246 | |
Thomas Gleixner | 8c18b2d | 2016-07-13 17:16:37 +0000 | [diff] [blame] | 3247 | static int kvm_dying_cpu(unsigned int cpu) |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3248 | { |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3249 | raw_spin_lock(&kvm_count_lock); |
Paolo Bonzini | 4fa92fb | 2013-09-10 12:57:17 +0200 | [diff] [blame] | 3250 | if (kvm_usage_count) |
| 3251 | hardware_disable_nolock(NULL); |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3252 | raw_spin_unlock(&kvm_count_lock); |
Thomas Gleixner | 8c18b2d | 2016-07-13 17:16:37 +0000 | [diff] [blame] | 3253 | return 0; |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3254 | } |
| 3255 | |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3256 | static void hardware_disable_all_nolock(void) |
| 3257 | { |
| 3258 | BUG_ON(!kvm_usage_count); |
| 3259 | |
| 3260 | kvm_usage_count--; |
| 3261 | if (!kvm_usage_count) |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3262 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3263 | } |
| 3264 | |
| 3265 | static void hardware_disable_all(void) |
| 3266 | { |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3267 | raw_spin_lock(&kvm_count_lock); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3268 | hardware_disable_all_nolock(); |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3269 | raw_spin_unlock(&kvm_count_lock); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3270 | } |
| 3271 | |
| 3272 | static int hardware_enable_all(void) |
| 3273 | { |
| 3274 | int r = 0; |
| 3275 | |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3276 | raw_spin_lock(&kvm_count_lock); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3277 | |
| 3278 | kvm_usage_count++; |
| 3279 | if (kvm_usage_count == 1) { |
| 3280 | atomic_set(&hardware_enable_failed, 0); |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3281 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3282 | |
| 3283 | if (atomic_read(&hardware_enable_failed)) { |
| 3284 | hardware_disable_all_nolock(); |
| 3285 | r = -EBUSY; |
| 3286 | } |
| 3287 | } |
| 3288 | |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3289 | raw_spin_unlock(&kvm_count_lock); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3290 | |
| 3291 | return r; |
| 3292 | } |
| 3293 | |
Rusty Russell | 9a2b85c | 2007-07-17 23:17:55 +1000 | [diff] [blame] | 3294 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
Mike Day | d77c26f | 2007-10-08 09:02:08 -0400 | [diff] [blame] | 3295 | void *v) |
Rusty Russell | 9a2b85c | 2007-07-17 23:17:55 +1000 | [diff] [blame] | 3296 | { |
Sheng Yang | 8e1c181 | 2009-04-29 11:09:04 +0800 | [diff] [blame] | 3297 | /* |
| 3298 | * Some (well, at least mine) BIOSes hang on reboot if |
| 3299 | * in vmx root mode. |
| 3300 | * |
| 3301 | * And Intel TXT required VMX off for all cpu when system shutdown. |
| 3302 | */ |
Xiubo Li | 1170adc | 2015-02-26 14:58:26 +0800 | [diff] [blame] | 3303 | pr_info("kvm: exiting hardware virtualization\n"); |
Sheng Yang | 8e1c181 | 2009-04-29 11:09:04 +0800 | [diff] [blame] | 3304 | kvm_rebooting = true; |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3305 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
Rusty Russell | 9a2b85c | 2007-07-17 23:17:55 +1000 | [diff] [blame] | 3306 | return NOTIFY_OK; |
| 3307 | } |
| 3308 | |
| 3309 | static struct notifier_block kvm_reboot_notifier = { |
| 3310 | .notifier_call = kvm_reboot, |
| 3311 | .priority = 0, |
| 3312 | }; |
| 3313 | |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3314 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3315 | { |
| 3316 | int i; |
| 3317 | |
| 3318 | for (i = 0; i < bus->dev_count; i++) { |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3319 | struct kvm_io_device *pos = bus->range[i].dev; |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3320 | |
| 3321 | kvm_iodevice_destructor(pos); |
| 3322 | } |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3323 | kfree(bus); |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3324 | } |
| 3325 | |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3326 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, |
Xiubo Li | 20e87b7 | 2015-02-26 14:58:25 +0800 | [diff] [blame] | 3327 | const struct kvm_io_range *r2) |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3328 | { |
Jason Wang | 8f4216c7 | 2015-09-15 14:41:57 +0800 | [diff] [blame] | 3329 | gpa_t addr1 = r1->addr; |
| 3330 | gpa_t addr2 = r2->addr; |
| 3331 | |
| 3332 | if (addr1 < addr2) |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3333 | return -1; |
Jason Wang | 8f4216c7 | 2015-09-15 14:41:57 +0800 | [diff] [blame] | 3334 | |
| 3335 | /* If r2->len == 0, match the exact address. If r2->len != 0, |
| 3336 | * accept any overlapping write. Any order is acceptable for |
| 3337 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures |
| 3338 | * we process all of them. |
| 3339 | */ |
| 3340 | if (r2->len) { |
| 3341 | addr1 += r1->len; |
| 3342 | addr2 += r2->len; |
| 3343 | } |
| 3344 | |
| 3345 | if (addr1 > addr2) |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3346 | return 1; |
Jason Wang | 8f4216c7 | 2015-09-15 14:41:57 +0800 | [diff] [blame] | 3347 | |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3348 | return 0; |
| 3349 | } |
| 3350 | |
Paolo Bonzini | a343c9b | 2013-07-16 13:03:29 +0200 | [diff] [blame] | 3351 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
| 3352 | { |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3353 | return kvm_io_bus_cmp(p1, p2); |
Paolo Bonzini | a343c9b | 2013-07-16 13:03:29 +0200 | [diff] [blame] | 3354 | } |
| 3355 | |
Geoff Levand | 39369f7 | 2013-04-05 19:20:30 +0000 | [diff] [blame] | 3356 | static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3357 | gpa_t addr, int len) |
| 3358 | { |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3359 | bus->range[bus->dev_count++] = (struct kvm_io_range) { |
| 3360 | .addr = addr, |
| 3361 | .len = len, |
| 3362 | .dev = dev, |
| 3363 | }; |
| 3364 | |
| 3365 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), |
| 3366 | kvm_io_bus_sort_cmp, NULL); |
| 3367 | |
| 3368 | return 0; |
| 3369 | } |
| 3370 | |
Geoff Levand | 39369f7 | 2013-04-05 19:20:30 +0000 | [diff] [blame] | 3371 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3372 | gpa_t addr, int len) |
| 3373 | { |
| 3374 | struct kvm_io_range *range, key; |
| 3375 | int off; |
| 3376 | |
| 3377 | key = (struct kvm_io_range) { |
| 3378 | .addr = addr, |
| 3379 | .len = len, |
| 3380 | }; |
| 3381 | |
| 3382 | range = bsearch(&key, bus->range, bus->dev_count, |
| 3383 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); |
| 3384 | if (range == NULL) |
| 3385 | return -ENOENT; |
| 3386 | |
| 3387 | off = range - bus->range; |
| 3388 | |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3389 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3390 | off--; |
| 3391 | |
| 3392 | return off; |
| 3393 | } |
| 3394 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3395 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3396 | struct kvm_io_range *range, const void *val) |
| 3397 | { |
| 3398 | int idx; |
| 3399 | |
| 3400 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); |
| 3401 | if (idx < 0) |
| 3402 | return -EOPNOTSUPP; |
| 3403 | |
| 3404 | while (idx < bus->dev_count && |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3405 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3406 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3407 | range->len, val)) |
| 3408 | return idx; |
| 3409 | idx++; |
| 3410 | } |
| 3411 | |
| 3412 | return -EOPNOTSUPP; |
| 3413 | } |
| 3414 | |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 3415 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3416 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 3417 | int len, const void *val) |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3418 | { |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3419 | struct kvm_io_bus *bus; |
| 3420 | struct kvm_io_range range; |
| 3421 | int r; |
| 3422 | |
| 3423 | range = (struct kvm_io_range) { |
| 3424 | .addr = addr, |
| 3425 | .len = len, |
| 3426 | }; |
| 3427 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3428 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
| 3429 | r = __kvm_io_bus_write(vcpu, bus, &range, val); |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3430 | return r < 0 ? r : 0; |
| 3431 | } |
| 3432 | |
| 3433 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3434 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, |
| 3435 | gpa_t addr, int len, const void *val, long cookie) |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3436 | { |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 3437 | struct kvm_io_bus *bus; |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3438 | struct kvm_io_range range; |
| 3439 | |
| 3440 | range = (struct kvm_io_range) { |
| 3441 | .addr = addr, |
| 3442 | .len = len, |
| 3443 | }; |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 3444 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3445 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3446 | |
| 3447 | /* First try the device referenced by cookie. */ |
| 3448 | if ((cookie >= 0) && (cookie < bus->dev_count) && |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3449 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3450 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3451 | val)) |
| 3452 | return cookie; |
| 3453 | |
| 3454 | /* |
| 3455 | * cookie contained garbage; fall back to search and return the |
| 3456 | * correct cookie value. |
| 3457 | */ |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3458 | return __kvm_io_bus_write(vcpu, bus, &range, val); |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3459 | } |
| 3460 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3461 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
| 3462 | struct kvm_io_range *range, void *val) |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3463 | { |
| 3464 | int idx; |
| 3465 | |
| 3466 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3467 | if (idx < 0) |
| 3468 | return -EOPNOTSUPP; |
| 3469 | |
| 3470 | while (idx < bus->dev_count && |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3471 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3472 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3473 | range->len, val)) |
| 3474 | return idx; |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3475 | idx++; |
| 3476 | } |
| 3477 | |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 3478 | return -EOPNOTSUPP; |
| 3479 | } |
Michael S. Tsirkin | 68c3b4d | 2014-03-31 21:50:44 +0300 | [diff] [blame] | 3480 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3481 | |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 3482 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3483 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3484 | int len, void *val) |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 3485 | { |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3486 | struct kvm_io_bus *bus; |
| 3487 | struct kvm_io_range range; |
| 3488 | int r; |
| 3489 | |
| 3490 | range = (struct kvm_io_range) { |
| 3491 | .addr = addr, |
| 3492 | .len = len, |
| 3493 | }; |
| 3494 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3495 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
| 3496 | r = __kvm_io_bus_read(vcpu, bus, &range, val); |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3497 | return r < 0 ? r : 0; |
| 3498 | } |
| 3499 | |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3500 | |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 3501 | /* Caller must hold slots_lock. */ |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3502 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
| 3503 | int len, struct kvm_io_device *dev) |
Michael S. Tsirkin | 6c47469 | 2009-06-29 22:24:26 +0300 | [diff] [blame] | 3504 | { |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3505 | struct kvm_io_bus *new_bus, *bus; |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3506 | |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3507 | bus = kvm->buses[bus_idx]; |
Amos Kong | 6ea34c9 | 2013-05-25 06:44:15 +0800 | [diff] [blame] | 3508 | /* exclude ioeventfd which is limited by maximum fd */ |
| 3509 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3510 | return -ENOSPC; |
| 3511 | |
Jason Wang | d3febdd | 2015-08-25 17:05:46 +0800 | [diff] [blame] | 3512 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) * |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3513 | sizeof(struct kvm_io_range)), GFP_KERNEL); |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3514 | if (!new_bus) |
| 3515 | return -ENOMEM; |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3516 | memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * |
| 3517 | sizeof(struct kvm_io_range))); |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3518 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3519 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
| 3520 | synchronize_srcu_expedited(&kvm->srcu); |
| 3521 | kfree(bus); |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3522 | |
| 3523 | return 0; |
| 3524 | } |
| 3525 | |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 3526 | /* Caller must hold slots_lock. */ |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3527 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
| 3528 | struct kvm_io_device *dev) |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3529 | { |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3530 | int i, r; |
| 3531 | struct kvm_io_bus *new_bus, *bus; |
Michael S. Tsirkin | 6c47469 | 2009-06-29 22:24:26 +0300 | [diff] [blame] | 3532 | |
Sasha Levin | cdfca7b | 2011-12-04 19:36:28 +0200 | [diff] [blame] | 3533 | bus = kvm->buses[bus_idx]; |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3534 | r = -ENOENT; |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3535 | for (i = 0; i < bus->dev_count; i++) |
| 3536 | if (bus->range[i].dev == dev) { |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3537 | r = 0; |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3538 | break; |
| 3539 | } |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3540 | |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3541 | if (r) |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3542 | return r; |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3543 | |
Jason Wang | d3febdd | 2015-08-25 17:05:46 +0800 | [diff] [blame] | 3544 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) * |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3545 | sizeof(struct kvm_io_range)), GFP_KERNEL); |
| 3546 | if (!new_bus) |
| 3547 | return -ENOMEM; |
| 3548 | |
| 3549 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); |
| 3550 | new_bus->dev_count--; |
| 3551 | memcpy(new_bus->range + i, bus->range + i + 1, |
| 3552 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3553 | |
| 3554 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
| 3555 | synchronize_srcu_expedited(&kvm->srcu); |
| 3556 | kfree(bus); |
| 3557 | return r; |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3558 | } |
| 3559 | |
Andre Przywara | 8a39d00 | 2016-07-15 12:43:26 +0100 | [diff] [blame] | 3560 | struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
| 3561 | gpa_t addr) |
| 3562 | { |
| 3563 | struct kvm_io_bus *bus; |
| 3564 | int dev_idx, srcu_idx; |
| 3565 | struct kvm_io_device *iodev = NULL; |
| 3566 | |
| 3567 | srcu_idx = srcu_read_lock(&kvm->srcu); |
| 3568 | |
| 3569 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
| 3570 | |
| 3571 | dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); |
| 3572 | if (dev_idx < 0) |
| 3573 | goto out_unlock; |
| 3574 | |
| 3575 | iodev = bus->range[dev_idx].dev; |
| 3576 | |
| 3577 | out_unlock: |
| 3578 | srcu_read_unlock(&kvm->srcu, srcu_idx); |
| 3579 | |
| 3580 | return iodev; |
| 3581 | } |
| 3582 | EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); |
| 3583 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3584 | static int kvm_debugfs_open(struct inode *inode, struct file *file, |
| 3585 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
| 3586 | const char *fmt) |
| 3587 | { |
| 3588 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) |
| 3589 | inode->i_private; |
| 3590 | |
| 3591 | /* The debugfs files are a reference to the kvm struct which |
| 3592 | * is still valid when kvm_destroy_vm is called. |
| 3593 | * To avoid the race between open and the removal of the debugfs |
| 3594 | * directory we test against the users count. |
| 3595 | */ |
| 3596 | if (!atomic_add_unless(&stat_data->kvm->users_count, 1, 0)) |
| 3597 | return -ENOENT; |
| 3598 | |
| 3599 | if (simple_attr_open(inode, file, get, set, fmt)) { |
| 3600 | kvm_put_kvm(stat_data->kvm); |
| 3601 | return -ENOMEM; |
| 3602 | } |
| 3603 | |
| 3604 | return 0; |
| 3605 | } |
| 3606 | |
| 3607 | static int kvm_debugfs_release(struct inode *inode, struct file *file) |
| 3608 | { |
| 3609 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) |
| 3610 | inode->i_private; |
| 3611 | |
| 3612 | simple_attr_release(inode, file); |
| 3613 | kvm_put_kvm(stat_data->kvm); |
| 3614 | |
| 3615 | return 0; |
| 3616 | } |
| 3617 | |
| 3618 | static int vm_stat_get_per_vm(void *data, u64 *val) |
| 3619 | { |
| 3620 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
| 3621 | |
| 3622 | *val = *(u32 *)((void *)stat_data->kvm + stat_data->offset); |
| 3623 | |
| 3624 | return 0; |
| 3625 | } |
| 3626 | |
| 3627 | static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file) |
| 3628 | { |
| 3629 | __simple_attr_check_format("%llu\n", 0ull); |
| 3630 | return kvm_debugfs_open(inode, file, vm_stat_get_per_vm, |
| 3631 | NULL, "%llu\n"); |
| 3632 | } |
| 3633 | |
| 3634 | static const struct file_operations vm_stat_get_per_vm_fops = { |
| 3635 | .owner = THIS_MODULE, |
| 3636 | .open = vm_stat_get_per_vm_open, |
| 3637 | .release = kvm_debugfs_release, |
| 3638 | .read = simple_attr_read, |
| 3639 | .write = simple_attr_write, |
| 3640 | .llseek = generic_file_llseek, |
| 3641 | }; |
| 3642 | |
| 3643 | static int vcpu_stat_get_per_vm(void *data, u64 *val) |
| 3644 | { |
| 3645 | int i; |
| 3646 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
| 3647 | struct kvm_vcpu *vcpu; |
| 3648 | |
| 3649 | *val = 0; |
| 3650 | |
| 3651 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) |
| 3652 | *val += *(u32 *)((void *)vcpu + stat_data->offset); |
| 3653 | |
| 3654 | return 0; |
| 3655 | } |
| 3656 | |
| 3657 | static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file) |
| 3658 | { |
| 3659 | __simple_attr_check_format("%llu\n", 0ull); |
| 3660 | return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm, |
| 3661 | NULL, "%llu\n"); |
| 3662 | } |
| 3663 | |
| 3664 | static const struct file_operations vcpu_stat_get_per_vm_fops = { |
| 3665 | .owner = THIS_MODULE, |
| 3666 | .open = vcpu_stat_get_per_vm_open, |
| 3667 | .release = kvm_debugfs_release, |
| 3668 | .read = simple_attr_read, |
| 3669 | .write = simple_attr_write, |
| 3670 | .llseek = generic_file_llseek, |
| 3671 | }; |
| 3672 | |
| 3673 | static const struct file_operations *stat_fops_per_vm[] = { |
| 3674 | [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops, |
| 3675 | [KVM_STAT_VM] = &vm_stat_get_per_vm_fops, |
| 3676 | }; |
| 3677 | |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3678 | static int vm_stat_get(void *_offset, u64 *val) |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3679 | { |
| 3680 | unsigned offset = (long)_offset; |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3681 | struct kvm *kvm; |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3682 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
| 3683 | u64 tmp_val; |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3684 | |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3685 | *val = 0; |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 3686 | spin_lock(&kvm_lock); |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3687 | list_for_each_entry(kvm, &vm_list, vm_list) { |
| 3688 | stat_tmp.kvm = kvm; |
| 3689 | vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val); |
| 3690 | *val += tmp_val; |
| 3691 | } |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 3692 | spin_unlock(&kvm_lock); |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3693 | return 0; |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3694 | } |
| 3695 | |
| 3696 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); |
| 3697 | |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3698 | static int vcpu_stat_get(void *_offset, u64 *val) |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3699 | { |
| 3700 | unsigned offset = (long)_offset; |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3701 | struct kvm *kvm; |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3702 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
| 3703 | u64 tmp_val; |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3704 | |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3705 | *val = 0; |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 3706 | spin_lock(&kvm_lock); |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3707 | list_for_each_entry(kvm, &vm_list, vm_list) { |
| 3708 | stat_tmp.kvm = kvm; |
| 3709 | vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val); |
| 3710 | *val += tmp_val; |
| 3711 | } |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 3712 | spin_unlock(&kvm_lock); |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3713 | return 0; |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3714 | } |
| 3715 | |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3716 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
| 3717 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 3718 | static const struct file_operations *stat_fops[] = { |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3719 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
| 3720 | [KVM_STAT_VM] = &vm_stat_fops, |
| 3721 | }; |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3722 | |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3723 | static int kvm_init_debug(void) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3724 | { |
Paolo Bonzini | 0c8eb04 | 2013-10-30 12:12:13 +0100 | [diff] [blame] | 3725 | int r = -EEXIST; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3726 | struct kvm_stats_debugfs_item *p; |
| 3727 | |
Hollis Blanchard | 76f7c87 | 2008-04-15 16:05:42 -0500 | [diff] [blame] | 3728 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3729 | if (kvm_debugfs_dir == NULL) |
| 3730 | goto out; |
| 3731 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3732 | kvm_debugfs_num_entries = 0; |
| 3733 | for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { |
Janosch Frank | 4bd33b5 | 2015-10-14 12:37:35 +0200 | [diff] [blame] | 3734 | if (!debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
| 3735 | (void *)(long)p->offset, |
| 3736 | stat_fops[p->kind])) |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3737 | goto out_dir; |
| 3738 | } |
| 3739 | |
| 3740 | return 0; |
| 3741 | |
| 3742 | out_dir: |
| 3743 | debugfs_remove_recursive(kvm_debugfs_dir); |
| 3744 | out: |
| 3745 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3746 | } |
| 3747 | |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3748 | static int kvm_suspend(void) |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3749 | { |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3750 | if (kvm_usage_count) |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3751 | hardware_disable_nolock(NULL); |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3752 | return 0; |
| 3753 | } |
| 3754 | |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3755 | static void kvm_resume(void) |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3756 | { |
Zachary Amsden | ca84d1a | 2010-08-19 22:07:28 -1000 | [diff] [blame] | 3757 | if (kvm_usage_count) { |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3758 | WARN_ON(raw_spin_is_locked(&kvm_count_lock)); |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3759 | hardware_enable_nolock(NULL); |
Zachary Amsden | ca84d1a | 2010-08-19 22:07:28 -1000 | [diff] [blame] | 3760 | } |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3761 | } |
| 3762 | |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3763 | static struct syscore_ops kvm_syscore_ops = { |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3764 | .suspend = kvm_suspend, |
| 3765 | .resume = kvm_resume, |
| 3766 | }; |
| 3767 | |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3768 | static inline |
| 3769 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) |
| 3770 | { |
| 3771 | return container_of(pn, struct kvm_vcpu, preempt_notifier); |
| 3772 | } |
| 3773 | |
| 3774 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) |
| 3775 | { |
| 3776 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 3777 | |
Raghavendra K T | 3a08a8f | 2013-03-04 23:32:07 +0530 | [diff] [blame] | 3778 | if (vcpu->preempted) |
| 3779 | vcpu->preempted = false; |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3780 | |
Radim Krčmář | e790d9e | 2014-08-21 18:08:05 +0200 | [diff] [blame] | 3781 | kvm_arch_sched_in(vcpu, cpu); |
| 3782 | |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3783 | kvm_arch_vcpu_load(vcpu, cpu); |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3784 | } |
| 3785 | |
| 3786 | static void kvm_sched_out(struct preempt_notifier *pn, |
| 3787 | struct task_struct *next) |
| 3788 | { |
| 3789 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); |
| 3790 | |
Raghavendra K T | 3a08a8f | 2013-03-04 23:32:07 +0530 | [diff] [blame] | 3791 | if (current->state == TASK_RUNNING) |
| 3792 | vcpu->preempted = true; |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3793 | kvm_arch_vcpu_put(vcpu); |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3794 | } |
| 3795 | |
Avi Kivity | 0ee75be | 2010-04-28 15:39:01 +0300 | [diff] [blame] | 3796 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3797 | struct module *module) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3798 | { |
| 3799 | int r; |
Yang, Sheng | 002c7f7 | 2007-07-31 14:23:01 +0300 | [diff] [blame] | 3800 | int cpu; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3801 | |
Zhang Xiantao | f8c16bb | 2007-11-14 20:40:21 +0800 | [diff] [blame] | 3802 | r = kvm_arch_init(opaque); |
| 3803 | if (r) |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3804 | goto out_fail; |
Zhang Xiantao | cb498ea | 2007-11-14 20:39:31 +0800 | [diff] [blame] | 3805 | |
Asias He | 7dac16c | 2013-05-08 10:57:29 +0800 | [diff] [blame] | 3806 | /* |
| 3807 | * kvm_arch_init makes sure there's at most one caller |
| 3808 | * for architectures that support multiple implementations, |
| 3809 | * like intel and amd on x86. |
| 3810 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating |
| 3811 | * conflicts in case kvm is already setup for another implementation. |
| 3812 | */ |
| 3813 | r = kvm_irqfd_init(); |
| 3814 | if (r) |
| 3815 | goto out_irqfd; |
| 3816 | |
Avi Kivity | 8437a61 | 2009-06-06 14:52:35 -0700 | [diff] [blame] | 3817 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3818 | r = -ENOMEM; |
| 3819 | goto out_free_0; |
| 3820 | } |
| 3821 | |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3822 | r = kvm_arch_hardware_setup(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3823 | if (r < 0) |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3824 | goto out_free_0a; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3825 | |
Yang, Sheng | 002c7f7 | 2007-07-31 14:23:01 +0300 | [diff] [blame] | 3826 | for_each_online_cpu(cpu) { |
| 3827 | smp_call_function_single(cpu, |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3828 | kvm_arch_check_processor_compat, |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 3829 | &r, 1); |
Yang, Sheng | 002c7f7 | 2007-07-31 14:23:01 +0300 | [diff] [blame] | 3830 | if (r < 0) |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3831 | goto out_free_1; |
Yang, Sheng | 002c7f7 | 2007-07-31 14:23:01 +0300 | [diff] [blame] | 3832 | } |
| 3833 | |
Thomas Gleixner | 8c18b2d | 2016-07-13 17:16:37 +0000 | [diff] [blame] | 3834 | r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "AP_KVM_STARTING", |
| 3835 | kvm_starting_cpu, kvm_dying_cpu); |
Avi Kivity | 774c47f | 2007-02-12 00:54:47 -0800 | [diff] [blame] | 3836 | if (r) |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3837 | goto out_free_2; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3838 | register_reboot_notifier(&kvm_reboot_notifier); |
| 3839 | |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3840 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
Avi Kivity | 0ee75be | 2010-04-28 15:39:01 +0300 | [diff] [blame] | 3841 | if (!vcpu_align) |
| 3842 | vcpu_align = __alignof__(struct kvm_vcpu); |
| 3843 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, |
Joe Perches | 56919c5 | 2007-11-12 20:06:51 -0800 | [diff] [blame] | 3844 | 0, NULL); |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3845 | if (!kvm_vcpu_cache) { |
| 3846 | r = -ENOMEM; |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3847 | goto out_free_3; |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3848 | } |
| 3849 | |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3850 | r = kvm_async_pf_init(); |
| 3851 | if (r) |
| 3852 | goto out_free; |
| 3853 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3854 | kvm_chardev_ops.owner = module; |
Christian Borntraeger | 3d3aab1 | 2008-12-02 11:17:32 +0100 | [diff] [blame] | 3855 | kvm_vm_fops.owner = module; |
| 3856 | kvm_vcpu_fops.owner = module; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3857 | |
| 3858 | r = misc_register(&kvm_dev); |
| 3859 | if (r) { |
Xiubo Li | 1170adc | 2015-02-26 14:58:26 +0800 | [diff] [blame] | 3860 | pr_err("kvm: misc device register failed\n"); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3861 | goto out_unreg; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3862 | } |
| 3863 | |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3864 | register_syscore_ops(&kvm_syscore_ops); |
| 3865 | |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3866 | kvm_preempt_ops.sched_in = kvm_sched_in; |
| 3867 | kvm_preempt_ops.sched_out = kvm_sched_out; |
| 3868 | |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3869 | r = kvm_init_debug(); |
| 3870 | if (r) { |
Xiubo Li | 1170adc | 2015-02-26 14:58:26 +0800 | [diff] [blame] | 3871 | pr_err("kvm: create debugfs files failed\n"); |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3872 | goto out_undebugfs; |
| 3873 | } |
Darrick J. Wong | 0ea4ed8 | 2009-10-14 16:21:00 -0700 | [diff] [blame] | 3874 | |
Paolo Bonzini | 3c3c29f | 2014-09-24 13:02:46 +0200 | [diff] [blame] | 3875 | r = kvm_vfio_ops_init(); |
| 3876 | WARN_ON(r); |
| 3877 | |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 3878 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3879 | |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3880 | out_undebugfs: |
| 3881 | unregister_syscore_ops(&kvm_syscore_ops); |
Wei Yongjun | afc2f79 | 2013-05-05 20:03:40 +0800 | [diff] [blame] | 3882 | misc_deregister(&kvm_dev); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3883 | out_unreg: |
| 3884 | kvm_async_pf_deinit(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3885 | out_free: |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3886 | kmem_cache_destroy(kvm_vcpu_cache); |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3887 | out_free_3: |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3888 | unregister_reboot_notifier(&kvm_reboot_notifier); |
Thomas Gleixner | 8c18b2d | 2016-07-13 17:16:37 +0000 | [diff] [blame] | 3889 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3890 | out_free_2: |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3891 | out_free_1: |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3892 | kvm_arch_hardware_unsetup(); |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3893 | out_free_0a: |
| 3894 | free_cpumask_var(cpus_hardware_enabled); |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3895 | out_free_0: |
Cornelia Huck | a0f155e | 2013-02-28 12:33:18 +0100 | [diff] [blame] | 3896 | kvm_irqfd_exit(); |
| 3897 | out_irqfd: |
Asias He | 7dac16c | 2013-05-08 10:57:29 +0800 | [diff] [blame] | 3898 | kvm_arch_exit(); |
| 3899 | out_fail: |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3900 | return r; |
| 3901 | } |
Zhang Xiantao | cb498ea | 2007-11-14 20:39:31 +0800 | [diff] [blame] | 3902 | EXPORT_SYMBOL_GPL(kvm_init); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3903 | |
Zhang Xiantao | cb498ea | 2007-11-14 20:39:31 +0800 | [diff] [blame] | 3904 | void kvm_exit(void) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3905 | { |
Janosch Frank | 4bd33b5 | 2015-10-14 12:37:35 +0200 | [diff] [blame] | 3906 | debugfs_remove_recursive(kvm_debugfs_dir); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3907 | misc_deregister(&kvm_dev); |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3908 | kmem_cache_destroy(kvm_vcpu_cache); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3909 | kvm_async_pf_deinit(); |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3910 | unregister_syscore_ops(&kvm_syscore_ops); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3911 | unregister_reboot_notifier(&kvm_reboot_notifier); |
Thomas Gleixner | 8c18b2d | 2016-07-13 17:16:37 +0000 | [diff] [blame] | 3912 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3913 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3914 | kvm_arch_hardware_unsetup(); |
Zhang Xiantao | f8c16bb | 2007-11-14 20:40:21 +0800 | [diff] [blame] | 3915 | kvm_arch_exit(); |
Cornelia Huck | a0f155e | 2013-02-28 12:33:18 +0100 | [diff] [blame] | 3916 | kvm_irqfd_exit(); |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3917 | free_cpumask_var(cpus_hardware_enabled); |
Wanpeng Li | 571ee1b | 2014-10-09 18:30:08 +0800 | [diff] [blame] | 3918 | kvm_vfio_ops_exit(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3919 | } |
Zhang Xiantao | cb498ea | 2007-11-14 20:39:31 +0800 | [diff] [blame] | 3920 | EXPORT_SYMBOL_GPL(kvm_exit); |