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 | } |
| 151 | |
Carsten Otte | 313a3dc | 2007-10-11 19:16:52 +0200 | [diff] [blame] | 152 | void vcpu_put(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 153 | { |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 154 | preempt_disable(); |
Carsten Otte | 313a3dc | 2007-10-11 19:16:52 +0200 | [diff] [blame] | 155 | kvm_arch_vcpu_put(vcpu); |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 156 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
| 157 | preempt_enable(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 158 | mutex_unlock(&vcpu->mutex); |
| 159 | } |
| 160 | |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 161 | static void ack_flush(void *_completed) |
| 162 | { |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 163 | } |
| 164 | |
Tang Chen | 445b823 | 2014-09-24 15:57:55 +0800 | [diff] [blame] | 165 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 166 | { |
Avi Kivity | 597a5f5 | 2008-07-20 14:24:22 +0300 | [diff] [blame] | 167 | int i, cpu, me; |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 168 | cpumask_var_t cpus; |
| 169 | bool called = true; |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 170 | struct kvm_vcpu *vcpu; |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 171 | |
Li Zefan | 79f5599 | 2009-06-15 14:58:26 +0800 | [diff] [blame] | 172 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 173 | |
Xiao Guangrong | 3cba413 | 2011-01-12 15:41:22 +0800 | [diff] [blame] | 174 | me = get_cpu(); |
Gleb Natapov | 988a2ca | 2009-06-09 15:56:29 +0300 | [diff] [blame] | 175 | kvm_for_each_vcpu(i, vcpu, kvm) { |
Xiao Guangrong | 3cba413 | 2011-01-12 15:41:22 +0800 | [diff] [blame] | 176 | kvm_make_request(req, vcpu); |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 177 | cpu = vcpu->cpu; |
Xiao Guangrong | 6b7e2d0 | 2011-01-12 15:40:31 +0800 | [diff] [blame] | 178 | |
Lan Tianyu | a30a050 | 2016-03-13 11:10:26 +0800 | [diff] [blame] | 179 | /* Set ->requests bit before we read ->mode. */ |
| 180 | smp_mb__after_atomic(); |
Xiao Guangrong | 6b7e2d0 | 2011-01-12 15:40:31 +0800 | [diff] [blame] | 181 | |
| 182 | if (cpus != NULL && cpu != -1 && cpu != me && |
| 183 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 184 | cpumask_set_cpu(cpu, cpus); |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 185 | } |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 186 | if (unlikely(cpus == NULL)) |
| 187 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); |
| 188 | else if (!cpumask_empty(cpus)) |
| 189 | smp_call_function_many(cpus, ack_flush, NULL, 1); |
| 190 | else |
| 191 | called = false; |
Xiao Guangrong | 3cba413 | 2011-01-12 15:41:22 +0800 | [diff] [blame] | 192 | put_cpu(); |
Rusty Russell | 6ef7a1b | 2008-12-08 20:28:04 +1030 | [diff] [blame] | 193 | free_cpumask_var(cpus); |
Rusty Russell | 4984689 | 2008-12-08 20:26:24 +1030 | [diff] [blame] | 194 | return called; |
| 195 | } |
| 196 | |
Mario Smarduch | a6d5101 | 2015-01-15 15:58:52 -0800 | [diff] [blame] | 197 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL |
Rusty Russell | 4984689 | 2008-12-08 20:26:24 +1030 | [diff] [blame] | 198 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
| 199 | { |
Lan Tianyu | 4ae3cb3 | 2016-03-13 11:10:28 +0800 | [diff] [blame] | 200 | /* |
| 201 | * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in |
| 202 | * kvm_make_all_cpus_request. |
| 203 | */ |
| 204 | long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); |
Xiao Guangrong | a086f6a | 2014-04-17 17:06:12 +0800 | [diff] [blame] | 205 | |
Lan Tianyu | 4ae3cb3 | 2016-03-13 11:10:28 +0800 | [diff] [blame] | 206 | /* |
| 207 | * We want to publish modifications to the page tables before reading |
| 208 | * mode. Pairs with a memory barrier in arch-specific code. |
| 209 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest |
| 210 | * and smp_mb in walk_shadow_page_lockless_begin/end. |
| 211 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. |
| 212 | * |
| 213 | * There is already an smp_mb__after_atomic() before |
| 214 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that |
| 215 | * barrier here. |
| 216 | */ |
Tang Chen | 445b823 | 2014-09-24 15:57:55 +0800 | [diff] [blame] | 217 | if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
Rusty Russell | 4984689 | 2008-12-08 20:26:24 +1030 | [diff] [blame] | 218 | ++kvm->stat.remote_tlb_flush; |
Xiao Guangrong | a086f6a | 2014-04-17 17:06:12 +0800 | [diff] [blame] | 219 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 220 | } |
Aneesh Kumar K.V | 2ba9f0d | 2013-10-07 22:17:59 +0530 | [diff] [blame] | 221 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
Mario Smarduch | a6d5101 | 2015-01-15 15:58:52 -0800 | [diff] [blame] | 222 | #endif |
Avi Kivity | d9e368d | 2007-06-07 19:18:30 +0300 | [diff] [blame] | 223 | |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 224 | void kvm_reload_remote_mmus(struct kvm *kvm) |
| 225 | { |
Tang Chen | 445b823 | 2014-09-24 15:57:55 +0800 | [diff] [blame] | 226 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 227 | } |
| 228 | |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 229 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
| 230 | { |
| 231 | struct page *page; |
| 232 | int r; |
| 233 | |
| 234 | mutex_init(&vcpu->mutex); |
| 235 | vcpu->cpu = -1; |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 236 | vcpu->kvm = kvm; |
| 237 | vcpu->vcpu_id = id; |
Rik van Riel | 34bb10b | 2011-02-01 09:52:41 -0500 | [diff] [blame] | 238 | vcpu->pid = NULL; |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 239 | init_swait_queue_head(&vcpu->wq); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 240 | kvm_async_pf_vcpu_init(vcpu); |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 241 | |
Feng Wu | bf9f6ac | 2015-09-18 22:29:55 +0800 | [diff] [blame] | 242 | vcpu->pre_pcpu = -1; |
| 243 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); |
| 244 | |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 245 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
| 246 | if (!page) { |
| 247 | r = -ENOMEM; |
| 248 | goto fail; |
| 249 | } |
| 250 | vcpu->run = page_address(page); |
| 251 | |
Raghavendra K T | 4c08849 | 2012-07-18 19:07:46 +0530 | [diff] [blame] | 252 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
| 253 | kvm_vcpu_set_dy_eligible(vcpu, false); |
Raghavendra K T | 3a08a8f | 2013-03-04 23:32:07 +0530 | [diff] [blame] | 254 | vcpu->preempted = false; |
Raghavendra K T | 4c08849 | 2012-07-18 19:07:46 +0530 | [diff] [blame] | 255 | |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 256 | r = kvm_arch_vcpu_init(vcpu); |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 257 | if (r < 0) |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 258 | goto fail_free_run; |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 259 | return 0; |
| 260 | |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 261 | fail_free_run: |
| 262 | free_page((unsigned long)vcpu->run); |
| 263 | fail: |
Rusty Russell | 76fafa5 | 2007-10-08 10:50:48 +1000 | [diff] [blame] | 264 | return r; |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 265 | } |
| 266 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); |
| 267 | |
| 268 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) |
| 269 | { |
Rik van Riel | 34bb10b | 2011-02-01 09:52:41 -0500 | [diff] [blame] | 270 | put_pid(vcpu->pid); |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 271 | kvm_arch_vcpu_uninit(vcpu); |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 272 | free_page((unsigned long)vcpu->run); |
| 273 | } |
| 274 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); |
| 275 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 276 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
| 277 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) |
| 278 | { |
| 279 | return container_of(mn, struct kvm, mmu_notifier); |
| 280 | } |
| 281 | |
| 282 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, |
| 283 | struct mm_struct *mm, |
| 284 | unsigned long address) |
| 285 | { |
| 286 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 287 | int need_tlb_flush, idx; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 288 | |
| 289 | /* |
| 290 | * When ->invalidate_page runs, the linux pte has been zapped |
| 291 | * already but the page is still allocated until |
| 292 | * ->invalidate_page returns. So if we increase the sequence |
| 293 | * here the kvm page fault will notice if the spte can't be |
| 294 | * established because the page is going to be freed. If |
| 295 | * instead the kvm page fault establishes the spte before |
| 296 | * ->invalidate_page runs, kvm_unmap_hva will release it |
| 297 | * before returning. |
| 298 | * |
| 299 | * The sequence increase only need to be seen at spin_unlock |
| 300 | * time, and not at spin_lock time. |
| 301 | * |
| 302 | * Increasing the sequence after the spin_unlock would be |
| 303 | * unsafe because the kvm page fault could then establish the |
| 304 | * pte after kvm_unmap_hva returned, without noticing the page |
| 305 | * is going to be freed. |
| 306 | */ |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 307 | idx = srcu_read_lock(&kvm->srcu); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 308 | spin_lock(&kvm->mmu_lock); |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 309 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 310 | kvm->mmu_notifier_seq++; |
Xiao Guangrong | a4ee1ca | 2010-11-23 11:13:00 +0800 | [diff] [blame] | 311 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 312 | /* we've to flush the tlb before the pages can be freed */ |
| 313 | if (need_tlb_flush) |
| 314 | kvm_flush_remote_tlbs(kvm); |
| 315 | |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 316 | spin_unlock(&kvm->mmu_lock); |
Tang Chen | fe71557 | 2014-09-24 15:57:57 +0800 | [diff] [blame] | 317 | |
| 318 | kvm_arch_mmu_notifier_invalidate_page(kvm, address); |
| 319 | |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 320 | srcu_read_unlock(&kvm->srcu, idx); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 321 | } |
| 322 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 323 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
| 324 | struct mm_struct *mm, |
| 325 | unsigned long address, |
| 326 | pte_t pte) |
| 327 | { |
| 328 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 329 | int idx; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 330 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 331 | idx = srcu_read_lock(&kvm->srcu); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 332 | spin_lock(&kvm->mmu_lock); |
| 333 | kvm->mmu_notifier_seq++; |
| 334 | kvm_set_spte_hva(kvm, address, pte); |
| 335 | spin_unlock(&kvm->mmu_lock); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 336 | srcu_read_unlock(&kvm->srcu, idx); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 337 | } |
| 338 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 339 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
| 340 | struct mm_struct *mm, |
| 341 | unsigned long start, |
| 342 | unsigned long end) |
| 343 | { |
| 344 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 345 | int need_tlb_flush = 0, idx; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 346 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 347 | idx = srcu_read_lock(&kvm->srcu); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 348 | spin_lock(&kvm->mmu_lock); |
| 349 | /* |
| 350 | * The count increase must become visible at unlock time as no |
| 351 | * spte can be established without taking the mmu_lock and |
| 352 | * count is also read inside the mmu_lock critical section. |
| 353 | */ |
| 354 | kvm->mmu_notifier_count++; |
Takuya Yoshikawa | b3ae209 | 2012-07-02 17:56:33 +0900 | [diff] [blame] | 355 | need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); |
Xiao Guangrong | a4ee1ca | 2010-11-23 11:13:00 +0800 | [diff] [blame] | 356 | need_tlb_flush |= kvm->tlbs_dirty; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 357 | /* we've to flush the tlb before the pages can be freed */ |
| 358 | if (need_tlb_flush) |
| 359 | kvm_flush_remote_tlbs(kvm); |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 360 | |
| 361 | spin_unlock(&kvm->mmu_lock); |
| 362 | srcu_read_unlock(&kvm->srcu, idx); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, |
| 366 | struct mm_struct *mm, |
| 367 | unsigned long start, |
| 368 | unsigned long end) |
| 369 | { |
| 370 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 371 | |
| 372 | spin_lock(&kvm->mmu_lock); |
| 373 | /* |
| 374 | * This sequence increase will notify the kvm page fault that |
| 375 | * the page that is going to be mapped in the spte could have |
| 376 | * been freed. |
| 377 | */ |
| 378 | kvm->mmu_notifier_seq++; |
Paul Mackerras | a355aa5 | 2011-12-12 12:37:21 +0000 | [diff] [blame] | 379 | smp_wmb(); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 380 | /* |
| 381 | * The above sequence increase must be visible before the |
Paul Mackerras | a355aa5 | 2011-12-12 12:37:21 +0000 | [diff] [blame] | 382 | * below count decrease, which is ensured by the smp_wmb above |
| 383 | * in conjunction with the smp_rmb in mmu_notifier_retry(). |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 384 | */ |
| 385 | kvm->mmu_notifier_count--; |
| 386 | spin_unlock(&kvm->mmu_lock); |
| 387 | |
| 388 | BUG_ON(kvm->mmu_notifier_count < 0); |
| 389 | } |
| 390 | |
| 391 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, |
| 392 | struct mm_struct *mm, |
Andres Lagar-Cavilla | 5712846 | 2014-09-22 14:54:42 -0700 | [diff] [blame] | 393 | unsigned long start, |
| 394 | unsigned long end) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 395 | { |
| 396 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 397 | int young, idx; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 398 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 399 | idx = srcu_read_lock(&kvm->srcu); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 400 | spin_lock(&kvm->mmu_lock); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 401 | |
Andres Lagar-Cavilla | 5712846 | 2014-09-22 14:54:42 -0700 | [diff] [blame] | 402 | young = kvm_age_hva(kvm, start, end); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 403 | if (young) |
| 404 | kvm_flush_remote_tlbs(kvm); |
| 405 | |
Takuya Yoshikawa | 565f3be | 2012-02-10 15:28:31 +0900 | [diff] [blame] | 406 | spin_unlock(&kvm->mmu_lock); |
| 407 | srcu_read_unlock(&kvm->srcu, idx); |
| 408 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 409 | return young; |
| 410 | } |
| 411 | |
Vladimir Davydov | 1d7715c | 2015-09-09 15:35:41 -0700 | [diff] [blame] | 412 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, |
| 413 | struct mm_struct *mm, |
| 414 | unsigned long start, |
| 415 | unsigned long end) |
| 416 | { |
| 417 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 418 | int young, idx; |
| 419 | |
| 420 | idx = srcu_read_lock(&kvm->srcu); |
| 421 | spin_lock(&kvm->mmu_lock); |
| 422 | /* |
| 423 | * Even though we do not flush TLB, this will still adversely |
| 424 | * affect performance on pre-Haswell Intel EPT, where there is |
| 425 | * no EPT Access Bit to clear so that we have to tear down EPT |
| 426 | * tables instead. If we find this unacceptable, we can always |
| 427 | * add a parameter to kvm_age_hva so that it effectively doesn't |
| 428 | * do anything on clear_young. |
| 429 | * |
| 430 | * Also note that currently we never issue secondary TLB flushes |
| 431 | * from clear_young, leaving this job up to the regular system |
| 432 | * cadence. If we find this inaccurate, we might come up with a |
| 433 | * more sophisticated heuristic later. |
| 434 | */ |
| 435 | young = kvm_age_hva(kvm, start, end); |
| 436 | spin_unlock(&kvm->mmu_lock); |
| 437 | srcu_read_unlock(&kvm->srcu, idx); |
| 438 | |
| 439 | return young; |
| 440 | } |
| 441 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 442 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
| 443 | struct mm_struct *mm, |
| 444 | unsigned long address) |
| 445 | { |
| 446 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 447 | int young, idx; |
| 448 | |
| 449 | idx = srcu_read_lock(&kvm->srcu); |
| 450 | spin_lock(&kvm->mmu_lock); |
| 451 | young = kvm_test_age_hva(kvm, address); |
| 452 | spin_unlock(&kvm->mmu_lock); |
| 453 | srcu_read_unlock(&kvm->srcu, idx); |
| 454 | |
| 455 | return young; |
| 456 | } |
| 457 | |
Marcelo Tosatti | 85db06e | 2008-12-10 21:23:26 +0100 | [diff] [blame] | 458 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
| 459 | struct mm_struct *mm) |
| 460 | { |
| 461 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
Lai Jiangshan | eda2bed | 2010-04-20 14:29:29 +0800 | [diff] [blame] | 462 | int idx; |
| 463 | |
| 464 | idx = srcu_read_lock(&kvm->srcu); |
Marcelo Tosatti | 2df72e9 | 2012-08-24 15:54:57 -0300 | [diff] [blame] | 465 | kvm_arch_flush_shadow_all(kvm); |
Lai Jiangshan | eda2bed | 2010-04-20 14:29:29 +0800 | [diff] [blame] | 466 | srcu_read_unlock(&kvm->srcu, idx); |
Marcelo Tosatti | 85db06e | 2008-12-10 21:23:26 +0100 | [diff] [blame] | 467 | } |
| 468 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 469 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
| 470 | .invalidate_page = kvm_mmu_notifier_invalidate_page, |
| 471 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
| 472 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, |
| 473 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, |
Vladimir Davydov | 1d7715c | 2015-09-09 15:35:41 -0700 | [diff] [blame] | 474 | .clear_young = kvm_mmu_notifier_clear_young, |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 475 | .test_young = kvm_mmu_notifier_test_young, |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 476 | .change_pte = kvm_mmu_notifier_change_pte, |
Marcelo Tosatti | 85db06e | 2008-12-10 21:23:26 +0100 | [diff] [blame] | 477 | .release = kvm_mmu_notifier_release, |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 478 | }; |
Avi Kivity | 4c07b0a | 2009-12-20 14:54:04 +0200 | [diff] [blame] | 479 | |
| 480 | static int kvm_init_mmu_notifier(struct kvm *kvm) |
| 481 | { |
| 482 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; |
| 483 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); |
| 484 | } |
| 485 | |
| 486 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ |
| 487 | |
| 488 | static int kvm_init_mmu_notifier(struct kvm *kvm) |
| 489 | { |
| 490 | return 0; |
| 491 | } |
| 492 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 493 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
| 494 | |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 495 | static struct kvm_memslots *kvm_alloc_memslots(void) |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 496 | { |
| 497 | int i; |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 498 | struct kvm_memslots *slots; |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 499 | |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 500 | slots = kvm_kvzalloc(sizeof(struct kvm_memslots)); |
| 501 | if (!slots) |
| 502 | return NULL; |
| 503 | |
| 504 | /* |
| 505 | * Init kvm generation close to the maximum to easily test the |
| 506 | * code of handling generation number wrap-around. |
| 507 | */ |
| 508 | slots->generation = -150; |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 509 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
Xiao Guangrong | f85e2cb | 2011-11-24 17:41:54 +0800 | [diff] [blame] | 510 | slots->id_to_index[i] = slots->memslots[i].id = i; |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 511 | |
| 512 | return slots; |
| 513 | } |
| 514 | |
| 515 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
| 516 | { |
| 517 | if (!memslot->dirty_bitmap) |
| 518 | return; |
| 519 | |
| 520 | kvfree(memslot->dirty_bitmap); |
| 521 | memslot->dirty_bitmap = NULL; |
| 522 | } |
| 523 | |
| 524 | /* |
| 525 | * Free any memory in @free but not in @dont. |
| 526 | */ |
| 527 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, |
| 528 | struct kvm_memory_slot *dont) |
| 529 | { |
| 530 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) |
| 531 | kvm_destroy_dirty_bitmap(free); |
| 532 | |
| 533 | kvm_arch_free_memslot(kvm, free, dont); |
| 534 | |
| 535 | free->npages = 0; |
| 536 | } |
| 537 | |
| 538 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) |
| 539 | { |
| 540 | struct kvm_memory_slot *memslot; |
| 541 | |
| 542 | if (!slots) |
| 543 | return; |
| 544 | |
| 545 | kvm_for_each_memslot(memslot, slots) |
| 546 | kvm_free_memslot(kvm, memslot, NULL); |
| 547 | |
| 548 | kvfree(slots); |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 549 | } |
| 550 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 551 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) |
| 552 | { |
| 553 | int i; |
| 554 | |
| 555 | if (!kvm->debugfs_dentry) |
| 556 | return; |
| 557 | |
| 558 | debugfs_remove_recursive(kvm->debugfs_dentry); |
| 559 | |
| 560 | for (i = 0; i < kvm_debugfs_num_entries; i++) |
| 561 | kfree(kvm->debugfs_stat_data[i]); |
| 562 | kfree(kvm->debugfs_stat_data); |
| 563 | } |
| 564 | |
| 565 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) |
| 566 | { |
| 567 | char dir_name[ITOA_MAX_LEN * 2]; |
| 568 | struct kvm_stat_data *stat_data; |
| 569 | struct kvm_stats_debugfs_item *p; |
| 570 | |
| 571 | if (!debugfs_initialized()) |
| 572 | return 0; |
| 573 | |
| 574 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); |
| 575 | kvm->debugfs_dentry = debugfs_create_dir(dir_name, |
| 576 | kvm_debugfs_dir); |
| 577 | if (!kvm->debugfs_dentry) |
| 578 | return -ENOMEM; |
| 579 | |
| 580 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, |
| 581 | sizeof(*kvm->debugfs_stat_data), |
| 582 | GFP_KERNEL); |
| 583 | if (!kvm->debugfs_stat_data) |
| 584 | return -ENOMEM; |
| 585 | |
| 586 | for (p = debugfs_entries; p->name; p++) { |
| 587 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL); |
| 588 | if (!stat_data) |
| 589 | return -ENOMEM; |
| 590 | |
| 591 | stat_data->kvm = kvm; |
| 592 | stat_data->offset = p->offset; |
| 593 | kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; |
| 594 | if (!debugfs_create_file(p->name, 0444, |
| 595 | kvm->debugfs_dentry, |
| 596 | stat_data, |
| 597 | stat_fops_per_vm[p->kind])) |
| 598 | return -ENOMEM; |
| 599 | } |
| 600 | return 0; |
| 601 | } |
| 602 | |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 603 | static struct kvm *kvm_create_vm(unsigned long type) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 604 | { |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 605 | int r, i; |
| 606 | struct kvm *kvm = kvm_arch_alloc_vm(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 607 | |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 608 | if (!kvm) |
| 609 | return ERR_PTR(-ENOMEM); |
| 610 | |
Paolo Bonzini | e9ad4ec | 2016-03-21 10:15:25 +0100 | [diff] [blame] | 611 | spin_lock_init(&kvm->mmu_lock); |
| 612 | atomic_inc(¤t->mm->mm_count); |
| 613 | kvm->mm = current->mm; |
| 614 | kvm_eventfd_init(kvm); |
| 615 | mutex_init(&kvm->lock); |
| 616 | mutex_init(&kvm->irq_lock); |
| 617 | mutex_init(&kvm->slots_lock); |
| 618 | atomic_set(&kvm->users_count, 1); |
| 619 | INIT_LIST_HEAD(&kvm->devices); |
| 620 | |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 621 | r = kvm_arch_init_vm(kvm, type); |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 622 | if (r) |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 623 | goto out_err_no_disable; |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 624 | |
| 625 | r = hardware_enable_all(); |
| 626 | if (r) |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 627 | goto out_err_no_disable; |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 628 | |
Paolo Bonzini | c77dcac | 2014-08-06 14:24:45 +0200 | [diff] [blame] | 629 | #ifdef CONFIG_HAVE_KVM_IRQFD |
Gleb Natapov | 136bdfe | 2009-08-24 11:54:23 +0300 | [diff] [blame] | 630 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
Avi Kivity | 75858a8 | 2009-01-04 17:10:50 +0200 | [diff] [blame] | 631 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 632 | |
Alex Williamson | 1e702d9 | 2012-12-10 10:33:32 -0700 | [diff] [blame] | 633 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
| 634 | |
Marcelo Tosatti | 46a26bf | 2009-12-23 14:35:16 -0200 | [diff] [blame] | 635 | r = -ENOMEM; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 636 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
| 637 | kvm->memslots[i] = kvm_alloc_memslots(); |
| 638 | if (!kvm->memslots[i]) |
| 639 | goto out_err_no_srcu; |
| 640 | } |
Paolo Bonzini | 00f034a | 2014-08-20 14:29:21 +0200 | [diff] [blame] | 641 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 642 | if (init_srcu_struct(&kvm->srcu)) |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 643 | goto out_err_no_srcu; |
| 644 | if (init_srcu_struct(&kvm->irq_srcu)) |
| 645 | goto out_err_no_irq_srcu; |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 646 | for (i = 0; i < KVM_NR_BUSES; i++) { |
| 647 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), |
| 648 | GFP_KERNEL); |
Jan Kiszka | 57e7fbe | 2010-11-09 12:42:12 +0100 | [diff] [blame] | 649 | if (!kvm->buses[i]) |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 650 | goto out_err; |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 651 | } |
Mike Waychison | 74b5c5b | 2011-06-03 13:04:53 -0700 | [diff] [blame] | 652 | |
Mike Waychison | 74b5c5b | 2011-06-03 13:04:53 -0700 | [diff] [blame] | 653 | r = kvm_init_mmu_notifier(kvm); |
| 654 | if (r) |
| 655 | goto out_err; |
| 656 | |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 657 | spin_lock(&kvm_lock); |
Rusty Russell | 5e58cfe | 2007-07-23 17:08:21 +1000 | [diff] [blame] | 658 | list_add(&kvm->vm_list, &vm_list); |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 659 | spin_unlock(&kvm_lock); |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 660 | |
Peter Zijlstra | 2ecd9d2 | 2015-07-03 18:53:58 +0200 | [diff] [blame] | 661 | preempt_notifier_inc(); |
| 662 | |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 663 | return kvm; |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 664 | |
| 665 | out_err: |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 666 | cleanup_srcu_struct(&kvm->irq_srcu); |
| 667 | out_err_no_irq_srcu: |
Jan Kiszka | 57e7fbe | 2010-11-09 12:42:12 +0100 | [diff] [blame] | 668 | cleanup_srcu_struct(&kvm->srcu); |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 669 | out_err_no_srcu: |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 670 | hardware_disable_all(); |
Christian Borntraeger | 719d93c | 2014-01-16 13:44:20 +0100 | [diff] [blame] | 671 | out_err_no_disable: |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 672 | for (i = 0; i < KVM_NR_BUSES; i++) |
| 673 | kfree(kvm->buses[i]); |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 674 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
| 675 | kvm_free_memslots(kvm, kvm->memslots[i]); |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 676 | kvm_arch_free_vm(kvm); |
Paolo Bonzini | e9ad4ec | 2016-03-21 10:15:25 +0100 | [diff] [blame] | 677 | mmdrop(current->mm); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 678 | return ERR_PTR(r); |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 679 | } |
| 680 | |
Takuya Yoshikawa | 92eca8f | 2012-05-20 13:13:28 +0900 | [diff] [blame] | 681 | /* |
| 682 | * Avoid using vmalloc for a small buffer. |
| 683 | * Should not be used when the size is statically known. |
| 684 | */ |
Takuya Yoshikawa | c1a7b32 | 2012-05-20 13:15:07 +0900 | [diff] [blame] | 685 | void *kvm_kvzalloc(unsigned long size) |
Takuya Yoshikawa | 92eca8f | 2012-05-20 13:13:28 +0900 | [diff] [blame] | 686 | { |
| 687 | if (size > PAGE_SIZE) |
| 688 | return vzalloc(size); |
| 689 | else |
| 690 | return kzalloc(size, GFP_KERNEL); |
| 691 | } |
| 692 | |
Scott Wood | 07f0a7b | 2013-04-25 14:11:23 +0000 | [diff] [blame] | 693 | static void kvm_destroy_devices(struct kvm *kvm) |
| 694 | { |
Geliang Tang | e6e3b5a | 2016-01-01 19:47:12 +0800 | [diff] [blame] | 695 | struct kvm_device *dev, *tmp; |
Scott Wood | 07f0a7b | 2013-04-25 14:11:23 +0000 | [diff] [blame] | 696 | |
Geliang Tang | e6e3b5a | 2016-01-01 19:47:12 +0800 | [diff] [blame] | 697 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { |
| 698 | list_del(&dev->vm_node); |
Scott Wood | 07f0a7b | 2013-04-25 14:11:23 +0000 | [diff] [blame] | 699 | dev->ops->destroy(dev); |
| 700 | } |
| 701 | } |
| 702 | |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 703 | static void kvm_destroy_vm(struct kvm *kvm) |
| 704 | { |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 705 | int i; |
Avi Kivity | 6d4e4c4 | 2007-11-21 16:41:05 +0200 | [diff] [blame] | 706 | struct mm_struct *mm = kvm->mm; |
| 707 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 708 | kvm_destroy_vm_debugfs(kvm); |
Sheng Yang | ad8ba2c | 2009-01-06 10:03:02 +0800 | [diff] [blame] | 709 | kvm_arch_sync_events(kvm); |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 710 | spin_lock(&kvm_lock); |
Avi Kivity | 133de90 | 2007-02-12 00:54:44 -0800 | [diff] [blame] | 711 | list_del(&kvm->vm_list); |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 712 | spin_unlock(&kvm_lock); |
Avi Kivity | 399ec80 | 2008-11-19 13:58:46 +0200 | [diff] [blame] | 713 | kvm_free_irq_routing(kvm); |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 714 | for (i = 0; i < KVM_NR_BUSES; i++) |
| 715 | kvm_io_bus_destroy(kvm->buses[i]); |
Avi Kivity | 980da6c | 2009-12-20 15:13:43 +0200 | [diff] [blame] | 716 | kvm_coalesced_mmio_free(kvm); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 717 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
| 718 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); |
Gleb Natapov | f00be0c | 2009-03-19 12:20:36 +0200 | [diff] [blame] | 719 | #else |
Marcelo Tosatti | 2df72e9 | 2012-08-24 15:54:57 -0300 | [diff] [blame] | 720 | kvm_arch_flush_shadow_all(kvm); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 721 | #endif |
Zhang Xiantao | d19a9cd | 2007-11-18 18:43:45 +0800 | [diff] [blame] | 722 | kvm_arch_destroy_vm(kvm); |
Scott Wood | 07f0a7b | 2013-04-25 14:11:23 +0000 | [diff] [blame] | 723 | kvm_destroy_devices(kvm); |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 724 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
| 725 | kvm_free_memslots(kvm, kvm->memslots[i]); |
Paolo Bonzini | 820b3fc | 2014-06-03 13:44:17 +0200 | [diff] [blame] | 726 | cleanup_srcu_struct(&kvm->irq_srcu); |
Jan Kiszka | d89f5ef | 2010-11-09 17:02:49 +0100 | [diff] [blame] | 727 | cleanup_srcu_struct(&kvm->srcu); |
| 728 | kvm_arch_free_vm(kvm); |
Peter Zijlstra | 2ecd9d2 | 2015-07-03 18:53:58 +0200 | [diff] [blame] | 729 | preempt_notifier_dec(); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 730 | hardware_disable_all(); |
Avi Kivity | 6d4e4c4 | 2007-11-21 16:41:05 +0200 | [diff] [blame] | 731 | mmdrop(mm); |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 732 | } |
| 733 | |
Izik Eidus | d39f13b | 2008-03-30 16:01:25 +0300 | [diff] [blame] | 734 | void kvm_get_kvm(struct kvm *kvm) |
| 735 | { |
| 736 | atomic_inc(&kvm->users_count); |
| 737 | } |
| 738 | EXPORT_SYMBOL_GPL(kvm_get_kvm); |
| 739 | |
| 740 | void kvm_put_kvm(struct kvm *kvm) |
| 741 | { |
| 742 | if (atomic_dec_and_test(&kvm->users_count)) |
| 743 | kvm_destroy_vm(kvm); |
| 744 | } |
| 745 | EXPORT_SYMBOL_GPL(kvm_put_kvm); |
| 746 | |
| 747 | |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 748 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
| 749 | { |
| 750 | struct kvm *kvm = filp->private_data; |
| 751 | |
Gregory Haskins | 721eecb | 2009-05-20 10:30:49 -0400 | [diff] [blame] | 752 | kvm_irqfd_release(kvm); |
| 753 | |
Izik Eidus | d39f13b | 2008-03-30 16:01:25 +0300 | [diff] [blame] | 754 | kvm_put_kvm(kvm); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 755 | return 0; |
| 756 | } |
| 757 | |
Takuya Yoshikawa | 515a012 | 2010-10-27 18:23:54 +0900 | [diff] [blame] | 758 | /* |
| 759 | * Allocation size is twice as large as the actual dirty bitmap size. |
Takuya Yoshikawa | 93474b2 | 2012-03-01 19:34:45 +0900 | [diff] [blame] | 760 | * 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] | 761 | */ |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 762 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
| 763 | { |
Takuya Yoshikawa | 515a012 | 2010-10-27 18:23:54 +0900 | [diff] [blame] | 764 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 765 | |
Takuya Yoshikawa | 92eca8f | 2012-05-20 13:13:28 +0900 | [diff] [blame] | 766 | memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes); |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 767 | if (!memslot->dirty_bitmap) |
| 768 | return -ENOMEM; |
| 769 | |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 770 | return 0; |
| 771 | } |
| 772 | |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 773 | /* |
Igor Mammedov | 0e60b07 | 2014-12-01 17:29:26 +0000 | [diff] [blame] | 774 | * Insert memslot and re-sort memslots based on their GFN, |
| 775 | * so binary search could be used to lookup GFN. |
| 776 | * Sorting algorithm takes advantage of having initially |
| 777 | * sorted array and known changed memslot position. |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 778 | */ |
Paolo Bonzini | 5cc1502 | 2014-11-14 10:55:31 +0100 | [diff] [blame] | 779 | static void update_memslots(struct kvm_memslots *slots, |
| 780 | struct kvm_memory_slot *new) |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 781 | { |
Paolo Bonzini | 8593176c | 2014-11-14 10:22:07 +0100 | [diff] [blame] | 782 | int id = new->id; |
| 783 | int i = slots->id_to_index[id]; |
Igor Mammedov | 063584d | 2014-11-13 23:00:13 +0000 | [diff] [blame] | 784 | struct kvm_memory_slot *mslots = slots->memslots; |
Xiao Guangrong | f85e2cb | 2011-11-24 17:41:54 +0800 | [diff] [blame] | 785 | |
Paolo Bonzini | 8593176c | 2014-11-14 10:22:07 +0100 | [diff] [blame] | 786 | WARN_ON(mslots[i].id != id); |
Igor Mammedov | 9c1a5d38 | 2014-12-01 17:29:27 +0000 | [diff] [blame] | 787 | if (!new->npages) { |
Paolo Bonzini | dbaff30 | 2014-12-27 21:08:16 +0100 | [diff] [blame] | 788 | WARN_ON(!mslots[i].npages); |
Igor Mammedov | 9c1a5d38 | 2014-12-01 17:29:27 +0000 | [diff] [blame] | 789 | if (mslots[i].npages) |
| 790 | slots->used_slots--; |
| 791 | } else { |
| 792 | if (!mslots[i].npages) |
| 793 | slots->used_slots++; |
| 794 | } |
Igor Mammedov | 0e60b07 | 2014-12-01 17:29:26 +0000 | [diff] [blame] | 795 | |
Igor Mammedov | 7f379cf | 2014-12-01 17:29:24 +0000 | [diff] [blame] | 796 | while (i < KVM_MEM_SLOTS_NUM - 1 && |
Igor Mammedov | 0e60b07 | 2014-12-01 17:29:26 +0000 | [diff] [blame] | 797 | new->base_gfn <= mslots[i + 1].base_gfn) { |
| 798 | if (!mslots[i + 1].npages) |
| 799 | break; |
Igor Mammedov | 7f379cf | 2014-12-01 17:29:24 +0000 | [diff] [blame] | 800 | mslots[i] = mslots[i + 1]; |
| 801 | slots->id_to_index[mslots[i].id] = i; |
| 802 | i++; |
| 803 | } |
Paolo Bonzini | efbeec7 | 2014-12-27 18:01:00 +0100 | [diff] [blame] | 804 | |
| 805 | /* |
| 806 | * The ">=" is needed when creating a slot with base_gfn == 0, |
| 807 | * so that it moves before all those with base_gfn == npages == 0. |
| 808 | * |
| 809 | * On the other hand, if new->npages is zero, the above loop has |
| 810 | * already left i pointing to the beginning of the empty part of |
| 811 | * mslots, and the ">=" would move the hole backwards in this |
| 812 | * case---which is wrong. So skip the loop when deleting a slot. |
| 813 | */ |
| 814 | if (new->npages) { |
| 815 | while (i > 0 && |
| 816 | new->base_gfn >= mslots[i - 1].base_gfn) { |
| 817 | mslots[i] = mslots[i - 1]; |
| 818 | slots->id_to_index[mslots[i].id] = i; |
| 819 | i--; |
| 820 | } |
Paolo Bonzini | dbaff30 | 2014-12-27 21:08:16 +0100 | [diff] [blame] | 821 | } else |
| 822 | WARN_ON_ONCE(i != slots->used_slots); |
Xiao Guangrong | f85e2cb | 2011-11-24 17:41:54 +0800 | [diff] [blame] | 823 | |
Paolo Bonzini | 8593176c | 2014-11-14 10:22:07 +0100 | [diff] [blame] | 824 | mslots[i] = *new; |
| 825 | slots->id_to_index[mslots[i].id] = i; |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 826 | } |
| 827 | |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 828 | 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] | 829 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 830 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
| 831 | |
Christoffer Dall | 0f8a4de | 2014-08-26 14:00:37 +0200 | [diff] [blame] | 832 | #ifdef __KVM_HAVE_READONLY_MEM |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 833 | valid_flags |= KVM_MEM_READONLY; |
| 834 | #endif |
| 835 | |
| 836 | if (mem->flags & ~valid_flags) |
Xiao Guangrong | a50d64d | 2012-08-21 10:58:13 +0800 | [diff] [blame] | 837 | return -EINVAL; |
| 838 | |
| 839 | return 0; |
| 840 | } |
| 841 | |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 842 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 843 | int as_id, struct kvm_memslots *slots) |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 844 | { |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 845 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 846 | |
David Matlack | ee3d157 | 2014-08-18 15:46:06 -0700 | [diff] [blame] | 847 | /* |
| 848 | * Set the low bit in the generation, which disables SPTE caching |
| 849 | * until the end of synchronize_srcu_expedited. |
| 850 | */ |
| 851 | WARN_ON(old_memslots->generation & 1); |
| 852 | slots->generation = old_memslots->generation + 1; |
| 853 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 854 | rcu_assign_pointer(kvm->memslots[as_id], slots); |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 855 | synchronize_srcu_expedited(&kvm->srcu); |
Takuya Yoshikawa | e59dbe0 | 2013-07-04 13:40:29 +0900 | [diff] [blame] | 856 | |
David Matlack | ee3d157 | 2014-08-18 15:46:06 -0700 | [diff] [blame] | 857 | /* |
| 858 | * Increment the new memslot generation a second time. This prevents |
| 859 | * vm exits that race with memslot updates from caching a memslot |
| 860 | * generation that will (potentially) be valid forever. |
| 861 | */ |
| 862 | slots->generation++; |
| 863 | |
Paolo Bonzini | 15f4601 | 2015-05-17 21:26:08 +0200 | [diff] [blame] | 864 | kvm_arch_memslots_updated(kvm, slots); |
Takuya Yoshikawa | e59dbe0 | 2013-07-04 13:40:29 +0900 | [diff] [blame] | 865 | |
| 866 | return old_memslots; |
Gleb Natapov | 7ec4fb4 | 2012-12-24 17:49:30 +0200 | [diff] [blame] | 867 | } |
| 868 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 869 | /* |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 870 | * Allocate some memory and give it an address in the guest physical address |
| 871 | * space. |
| 872 | * |
| 873 | * Discontiguous memory is allowed, mostly for framebuffers. |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 874 | * |
Dominik Dingel | 02d5d55 | 2014-10-27 16:22:56 +0100 | [diff] [blame] | 875 | * Must be called holding kvm->slots_lock for write. |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 876 | */ |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 877 | int __kvm_set_memory_region(struct kvm *kvm, |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 878 | const struct kvm_userspace_memory_region *mem) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 879 | { |
Avi Kivity | 8234b22 | 2010-12-27 12:08:45 +0200 | [diff] [blame] | 880 | int r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 881 | gfn_t base_gfn; |
Heiko Carstens | 28bcb11 | 2009-09-03 17:35:35 +0200 | [diff] [blame] | 882 | unsigned long npages; |
Takuya Yoshikawa | a843fac | 2013-01-11 18:27:43 +0900 | [diff] [blame] | 883 | struct kvm_memory_slot *slot; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 884 | struct kvm_memory_slot old, new; |
Alex Williamson | b7f69c5 | 2012-12-10 10:33:03 -0700 | [diff] [blame] | 885 | struct kvm_memslots *slots = NULL, *old_memslots; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 886 | int as_id, id; |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 887 | enum kvm_mr_change change; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 888 | |
Xiao Guangrong | a50d64d | 2012-08-21 10:58:13 +0800 | [diff] [blame] | 889 | r = check_memory_region_flags(mem); |
| 890 | if (r) |
| 891 | goto out; |
| 892 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 893 | r = -EINVAL; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 894 | as_id = mem->slot >> 16; |
| 895 | id = (u16)mem->slot; |
| 896 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 897 | /* General sanity checks */ |
| 898 | if (mem->memory_size & (PAGE_SIZE - 1)) |
| 899 | goto out; |
| 900 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) |
| 901 | goto out; |
Takuya Yoshikawa | fa3d315 | 2011-05-07 16:35:38 +0900 | [diff] [blame] | 902 | /* We can read the guest memory with __xxx_user() later on. */ |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 903 | if ((id < KVM_USER_MEM_SLOTS) && |
Takuya Yoshikawa | fa3d315 | 2011-05-07 16:35:38 +0900 | [diff] [blame] | 904 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
Heiko Carstens | 9e3bb6b | 2011-05-24 07:51:27 +0200 | [diff] [blame] | 905 | !access_ok(VERIFY_WRITE, |
| 906 | (void __user *)(unsigned long)mem->userspace_addr, |
| 907 | mem->memory_size))) |
Hollis Blanchard | 7874980 | 2008-11-07 13:32:12 -0600 | [diff] [blame] | 908 | goto out; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 909 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 910 | goto out; |
| 911 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) |
| 912 | goto out; |
| 913 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 914 | slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 915 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
| 916 | npages = mem->memory_size >> PAGE_SHIFT; |
| 917 | |
Takuya Yoshikawa | 660c22c | 2010-04-13 22:47:24 +0900 | [diff] [blame] | 918 | if (npages > KVM_MEM_MAX_NR_PAGES) |
| 919 | goto out; |
| 920 | |
Takuya Yoshikawa | a843fac | 2013-01-11 18:27:43 +0900 | [diff] [blame] | 921 | new = old = *slot; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 922 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 923 | new.id = id; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 924 | new.base_gfn = base_gfn; |
| 925 | new.npages = npages; |
| 926 | new.flags = mem->flags; |
| 927 | |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 928 | if (npages) { |
| 929 | if (!old.npages) |
| 930 | change = KVM_MR_CREATE; |
| 931 | else { /* Modify an existing slot. */ |
| 932 | if ((mem->userspace_addr != old.userspace_addr) || |
Takuya Yoshikawa | 75d61fb | 2013-01-30 19:40:41 +0900 | [diff] [blame] | 933 | (npages != old.npages) || |
| 934 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 935 | goto out; |
| 936 | |
| 937 | if (base_gfn != old.base_gfn) |
| 938 | change = KVM_MR_MOVE; |
| 939 | else if (new.flags != old.flags) |
| 940 | change = KVM_MR_FLAGS_ONLY; |
| 941 | else { /* Nothing to change. */ |
| 942 | r = 0; |
| 943 | goto out; |
| 944 | } |
| 945 | } |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 946 | } else { |
| 947 | if (!old.npages) |
| 948 | goto out; |
| 949 | |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 950 | change = KVM_MR_DELETE; |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 951 | new.base_gfn = 0; |
| 952 | new.flags = 0; |
| 953 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 954 | |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 955 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
Takuya Yoshikawa | 0a706be | 2013-01-11 18:26:55 +0900 | [diff] [blame] | 956 | /* Check for overlaps */ |
| 957 | r = -EEXIST; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 958 | kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { |
Takuya Yoshikawa | a843fac | 2013-01-11 18:27:43 +0900 | [diff] [blame] | 959 | if ((slot->id >= KVM_USER_MEM_SLOTS) || |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 960 | (slot->id == id)) |
Takuya Yoshikawa | 0a706be | 2013-01-11 18:26:55 +0900 | [diff] [blame] | 961 | continue; |
| 962 | if (!((base_gfn + npages <= slot->base_gfn) || |
| 963 | (base_gfn >= slot->base_gfn + slot->npages))) |
| 964 | goto out; |
| 965 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 966 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 967 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 968 | /* Free page dirty bitmap if unneeded */ |
| 969 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) |
Al Viro | 8b6d44c | 2007-02-09 16:38:40 +0000 | [diff] [blame] | 970 | new.dirty_bitmap = NULL; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 971 | |
| 972 | r = -ENOMEM; |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 973 | if (change == KVM_MR_CREATE) { |
Takuya Yoshikawa | 189a2f7 | 2012-02-08 13:01:09 +0900 | [diff] [blame] | 974 | new.userspace_addr = mem->userspace_addr; |
Takuya Yoshikawa | d89cc61 | 2012-08-01 18:03:28 +0900 | [diff] [blame] | 975 | |
Aneesh Kumar K.V | 5587027 | 2013-10-07 22:18:00 +0530 | [diff] [blame] | 976 | if (kvm_arch_create_memslot(kvm, &new, npages)) |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 977 | goto out_free; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 978 | } |
Joerg Roedel | ec04b26 | 2009-06-19 15:16:23 +0200 | [diff] [blame] | 979 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 980 | /* Allocate page dirty bitmap if needed */ |
| 981 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { |
Takuya Yoshikawa | a36a57b1 | 2010-10-27 18:22:19 +0900 | [diff] [blame] | 982 | if (kvm_create_dirty_bitmap(&new) < 0) |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 983 | goto out_free; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 984 | } |
| 985 | |
Igor Mammedov | 7449613 | 2015-03-20 12:21:37 +0000 | [diff] [blame] | 986 | slots = kvm_kvzalloc(sizeof(struct kvm_memslots)); |
Paolo Bonzini | f2a8103 | 2014-11-14 10:46:45 +0100 | [diff] [blame] | 987 | if (!slots) |
| 988 | goto out_free; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 989 | memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); |
Paolo Bonzini | f2a8103 | 2014-11-14 10:46:45 +0100 | [diff] [blame] | 990 | |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 991 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 992 | slot = id_to_memslot(slots, id); |
Xiao Guangrong | 28a3754 | 2011-11-24 19:04:35 +0800 | [diff] [blame] | 993 | slot->flags |= KVM_MEMSLOT_INVALID; |
| 994 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 995 | old_memslots = install_new_memslots(kvm, as_id, slots); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 996 | |
Alex Williamson | e40f193 | 2012-12-10 10:32:57 -0700 | [diff] [blame] | 997 | /* slot was deleted or moved, clear iommu mapping */ |
| 998 | kvm_iommu_unmap_pages(kvm, &old); |
Marcelo Tosatti | 12d6e75 | 2012-08-24 15:54:58 -0300 | [diff] [blame] | 999 | /* From this point no new shadow pages pointing to a deleted, |
| 1000 | * or moved, memslot will be created. |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1001 | * |
| 1002 | * validation of sp->gfn happens in: |
Xiubo Li | b7d409d | 2015-02-26 14:58:24 +0800 | [diff] [blame] | 1003 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) |
| 1004 | * - kvm_is_visible_gfn (mmu_check_roots) |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1005 | */ |
Marcelo Tosatti | 2df72e9 | 2012-08-24 15:54:57 -0300 | [diff] [blame] | 1006 | kvm_arch_flush_shadow_memslot(kvm, slot); |
Paolo Bonzini | f2a8103 | 2014-11-14 10:46:45 +0100 | [diff] [blame] | 1007 | |
| 1008 | /* |
| 1009 | * We can re-use the old_memslots from above, the only difference |
| 1010 | * from the currently installed memslots is the invalid flag. This |
| 1011 | * will get overwritten by update_memslots anyway. |
| 1012 | */ |
Alex Williamson | b7f69c5 | 2012-12-10 10:33:03 -0700 | [diff] [blame] | 1013 | slots = old_memslots; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1014 | } |
Marcelo Tosatti | 34d4cb8 | 2008-07-10 20:49:31 -0300 | [diff] [blame] | 1015 | |
Takuya Yoshikawa | 7b6195a | 2013-02-27 19:44:34 +0900 | [diff] [blame] | 1016 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); |
Marcelo Tosatti | f7784b8 | 2009-12-23 14:35:18 -0200 | [diff] [blame] | 1017 | if (r) |
Alex Williamson | b7f69c5 | 2012-12-10 10:33:03 -0700 | [diff] [blame] | 1018 | goto out_slots; |
Marcelo Tosatti | f7784b8 | 2009-12-23 14:35:18 -0200 | [diff] [blame] | 1019 | |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 1020 | /* actual memory is freed via old in kvm_free_memslot below */ |
Takuya Yoshikawa | f64c039 | 2013-01-29 11:00:07 +0900 | [diff] [blame] | 1021 | if (change == KVM_MR_DELETE) { |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1022 | new.dirty_bitmap = NULL; |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 1023 | memset(&new.arch, 0, sizeof(new.arch)); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1024 | } |
| 1025 | |
Paolo Bonzini | 5cc1502 | 2014-11-14 10:55:31 +0100 | [diff] [blame] | 1026 | update_memslots(slots, &new); |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1027 | old_memslots = install_new_memslots(kvm, as_id, slots); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1028 | |
Paolo Bonzini | f36f3f2 | 2015-05-18 13:20:23 +0200 | [diff] [blame] | 1029 | kvm_arch_commit_memory_region(kvm, mem, &old, &new, change); |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 1030 | |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 1031 | kvm_free_memslot(kvm, &old, &new); |
Igor Mammedov | 7449613 | 2015-03-20 12:21:37 +0000 | [diff] [blame] | 1032 | kvfree(old_memslots); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1033 | |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1034 | /* |
| 1035 | * 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] | 1036 | * un-mapped and re-mapped if their base changes. Since base change |
| 1037 | * unmapping is handled above with slot deletion, mapping alone is |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1038 | * needed here. Anything else the iommu might care about for existing |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1039 | * slots (size changes, userspace addr changes and read-only flag |
| 1040 | * changes) is disallowed above, so any other attribute changes getting |
| 1041 | * here can be skipped. |
Izik Eidus | 210c7c4 | 2007-10-24 23:52:57 +0200 | [diff] [blame] | 1042 | */ |
| 1043 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1044 | r = kvm_iommu_map_pages(kvm, &new); |
Yang Zhang | e0230e1 | 2013-10-24 09:56:39 +0800 | [diff] [blame] | 1045 | return r; |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1046 | } |
| 1047 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1048 | return 0; |
| 1049 | |
| 1050 | out_slots: |
Igor Mammedov | 7449613 | 2015-03-20 12:21:37 +0000 | [diff] [blame] | 1051 | kvfree(slots); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1052 | out_free: |
Paolo Bonzini | a47d2b0 | 2015-05-17 11:41:37 +0200 | [diff] [blame] | 1053 | kvm_free_memslot(kvm, &new, &old); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1054 | out: |
| 1055 | return r; |
Izik Eidus | 210c7c4 | 2007-10-24 23:52:57 +0200 | [diff] [blame] | 1056 | } |
| 1057 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1058 | |
| 1059 | int kvm_set_memory_region(struct kvm *kvm, |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 1060 | const struct kvm_userspace_memory_region *mem) |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1061 | { |
| 1062 | int r; |
| 1063 | |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 1064 | mutex_lock(&kvm->slots_lock); |
Takuya Yoshikawa | 47ae31e | 2013-02-27 19:43:00 +0900 | [diff] [blame] | 1065 | r = __kvm_set_memory_region(kvm, mem); |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 1066 | mutex_unlock(&kvm->slots_lock); |
Sheng Yang | f78e0e2 | 2007-10-29 09:40:42 +0800 | [diff] [blame] | 1067 | return r; |
| 1068 | } |
Izik Eidus | 210c7c4 | 2007-10-24 23:52:57 +0200 | [diff] [blame] | 1069 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
| 1070 | |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 1071 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
| 1072 | struct kvm_userspace_memory_region *mem) |
Izik Eidus | 210c7c4 | 2007-10-24 23:52:57 +0200 | [diff] [blame] | 1073 | { |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1074 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1075 | return -EINVAL; |
Paolo Bonzini | 09170a4 | 2015-05-18 13:59:39 +0200 | [diff] [blame] | 1076 | |
Takuya Yoshikawa | 47ae31e | 2013-02-27 19:43:00 +0900 | [diff] [blame] | 1077 | return kvm_set_memory_region(kvm, mem); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1078 | } |
| 1079 | |
Zhang Xiantao | 5bb064d | 2007-11-18 20:29:43 +0800 | [diff] [blame] | 1080 | int kvm_get_dirty_log(struct kvm *kvm, |
| 1081 | struct kvm_dirty_log *log, int *is_dirty) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1082 | { |
Paolo Bonzini | 9f6b802 | 2015-05-17 16:20:07 +0200 | [diff] [blame] | 1083 | struct kvm_memslots *slots; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1084 | struct kvm_memory_slot *memslot; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1085 | int r, i, as_id, id; |
Takuya Yoshikawa | 87bf6e7 | 2010-04-12 19:35:35 +0900 | [diff] [blame] | 1086 | unsigned long n; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1087 | unsigned long any = 0; |
| 1088 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1089 | r = -EINVAL; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1090 | as_id = log->slot >> 16; |
| 1091 | id = (u16)log->slot; |
| 1092 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1093 | goto out; |
| 1094 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1095 | slots = __kvm_memslots(kvm, as_id); |
| 1096 | memslot = id_to_memslot(slots, id); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1097 | r = -ENOENT; |
| 1098 | if (!memslot->dirty_bitmap) |
| 1099 | goto out; |
| 1100 | |
Takuya Yoshikawa | 87bf6e7 | 2010-04-12 19:35:35 +0900 | [diff] [blame] | 1101 | n = kvm_dirty_bitmap_bytes(memslot); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1102 | |
Uri Lublin | cd1a4a9 | 2007-02-22 16:43:09 +0200 | [diff] [blame] | 1103 | for (i = 0; !any && i < n/sizeof(long); ++i) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1104 | any = memslot->dirty_bitmap[i]; |
| 1105 | |
| 1106 | r = -EFAULT; |
| 1107 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) |
| 1108 | goto out; |
| 1109 | |
Zhang Xiantao | 5bb064d | 2007-11-18 20:29:43 +0800 | [diff] [blame] | 1110 | if (any) |
| 1111 | *is_dirty = 1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1112 | |
| 1113 | r = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1114 | out: |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1115 | return r; |
| 1116 | } |
Aneesh Kumar K.V | 2ba9f0d | 2013-10-07 22:17:59 +0530 | [diff] [blame] | 1117 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1118 | |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1119 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
| 1120 | /** |
| 1121 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages |
| 1122 | * are dirty write protect them for next write. |
| 1123 | * @kvm: pointer to kvm instance |
| 1124 | * @log: slot id and address to which we copy the log |
| 1125 | * @is_dirty: flag set if any page is dirty |
| 1126 | * |
| 1127 | * We need to keep it in mind that VCPU threads can write to the bitmap |
| 1128 | * concurrently. So, to avoid losing track of dirty pages we keep the |
| 1129 | * following order: |
| 1130 | * |
| 1131 | * 1. Take a snapshot of the bit and clear it if needed. |
| 1132 | * 2. Write protect the corresponding page. |
| 1133 | * 3. Copy the snapshot to the userspace. |
| 1134 | * 4. Upon return caller flushes TLB's if needed. |
| 1135 | * |
| 1136 | * Between 2 and 4, the guest may write to the page using the remaining TLB |
| 1137 | * entry. This is not a problem because the page is reported dirty using |
| 1138 | * the snapshot taken before and step 4 ensures that writes done after |
| 1139 | * exiting to userspace will be logged for the next call. |
| 1140 | * |
| 1141 | */ |
| 1142 | int kvm_get_dirty_log_protect(struct kvm *kvm, |
| 1143 | struct kvm_dirty_log *log, bool *is_dirty) |
| 1144 | { |
Paolo Bonzini | 9f6b802 | 2015-05-17 16:20:07 +0200 | [diff] [blame] | 1145 | struct kvm_memslots *slots; |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1146 | struct kvm_memory_slot *memslot; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1147 | int r, i, as_id, id; |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1148 | unsigned long n; |
| 1149 | unsigned long *dirty_bitmap; |
| 1150 | unsigned long *dirty_bitmap_buffer; |
| 1151 | |
| 1152 | r = -EINVAL; |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1153 | as_id = log->slot >> 16; |
| 1154 | id = (u16)log->slot; |
| 1155 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1156 | goto out; |
| 1157 | |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 1158 | slots = __kvm_memslots(kvm, as_id); |
| 1159 | memslot = id_to_memslot(slots, id); |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1160 | |
| 1161 | dirty_bitmap = memslot->dirty_bitmap; |
| 1162 | r = -ENOENT; |
| 1163 | if (!dirty_bitmap) |
| 1164 | goto out; |
| 1165 | |
| 1166 | n = kvm_dirty_bitmap_bytes(memslot); |
| 1167 | |
| 1168 | dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long); |
| 1169 | memset(dirty_bitmap_buffer, 0, n); |
| 1170 | |
| 1171 | spin_lock(&kvm->mmu_lock); |
| 1172 | *is_dirty = false; |
| 1173 | for (i = 0; i < n / sizeof(long); i++) { |
| 1174 | unsigned long mask; |
| 1175 | gfn_t offset; |
| 1176 | |
| 1177 | if (!dirty_bitmap[i]) |
| 1178 | continue; |
| 1179 | |
| 1180 | *is_dirty = true; |
| 1181 | |
| 1182 | mask = xchg(&dirty_bitmap[i], 0); |
| 1183 | dirty_bitmap_buffer[i] = mask; |
| 1184 | |
Takuya Yoshikawa | 58d2930 | 2015-03-17 16:19:58 +0900 | [diff] [blame] | 1185 | if (mask) { |
| 1186 | offset = i * BITS_PER_LONG; |
| 1187 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, |
| 1188 | offset, mask); |
| 1189 | } |
Mario Smarduch | ba0513b | 2015-01-15 15:58:53 -0800 | [diff] [blame] | 1190 | } |
| 1191 | |
| 1192 | spin_unlock(&kvm->mmu_lock); |
| 1193 | |
| 1194 | r = -EFAULT; |
| 1195 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) |
| 1196 | goto out; |
| 1197 | |
| 1198 | r = 0; |
| 1199 | out: |
| 1200 | return r; |
| 1201 | } |
| 1202 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect); |
| 1203 | #endif |
| 1204 | |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 1205 | bool kvm_largepages_enabled(void) |
| 1206 | { |
| 1207 | return largepages_enabled; |
| 1208 | } |
| 1209 | |
Marcelo Tosatti | 54dee99 | 2009-06-11 12:07:44 -0300 | [diff] [blame] | 1210 | void kvm_disable_largepages(void) |
| 1211 | { |
| 1212 | largepages_enabled = false; |
| 1213 | } |
| 1214 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); |
| 1215 | |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1216 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
| 1217 | { |
| 1218 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); |
| 1219 | } |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 1220 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1221 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1222 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1223 | { |
| 1224 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); |
| 1225 | } |
| 1226 | |
Yaowei Bai | 33e9415 | 2015-11-14 11:21:06 +0800 | [diff] [blame] | 1227 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1228 | { |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 1229 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1230 | |
Alex Williamson | bbacc0c | 2012-12-10 10:33:09 -0700 | [diff] [blame] | 1231 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
Xiao Guangrong | bf3e05b | 2011-11-24 17:40:57 +0800 | [diff] [blame] | 1232 | memslot->flags & KVM_MEMSLOT_INVALID) |
Yaowei Bai | 33e9415 | 2015-11-14 11:21:06 +0800 | [diff] [blame] | 1233 | return false; |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1234 | |
Yaowei Bai | 33e9415 | 2015-11-14 11:21:06 +0800 | [diff] [blame] | 1235 | return true; |
Izik Eidus | e0d62c7 | 2007-10-24 23:57:46 +0200 | [diff] [blame] | 1236 | } |
| 1237 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); |
| 1238 | |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 1239 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
| 1240 | { |
| 1241 | struct vm_area_struct *vma; |
| 1242 | unsigned long addr, size; |
| 1243 | |
| 1244 | size = PAGE_SIZE; |
| 1245 | |
| 1246 | addr = gfn_to_hva(kvm, gfn); |
| 1247 | if (kvm_is_error_hva(addr)) |
| 1248 | return PAGE_SIZE; |
| 1249 | |
| 1250 | down_read(¤t->mm->mmap_sem); |
| 1251 | vma = find_vma(current->mm, addr); |
| 1252 | if (!vma) |
| 1253 | goto out; |
| 1254 | |
| 1255 | size = vma_kernel_pagesize(vma); |
| 1256 | |
| 1257 | out: |
| 1258 | up_read(¤t->mm->mmap_sem); |
| 1259 | |
| 1260 | return size; |
| 1261 | } |
| 1262 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1263 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
| 1264 | { |
| 1265 | return slot->flags & KVM_MEM_READONLY; |
| 1266 | } |
| 1267 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1268 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1269 | gfn_t *nr_pages, bool write) |
Izik Eidus | 539cb66 | 2007-11-11 22:05:04 +0200 | [diff] [blame] | 1270 | { |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1271 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
Xiao Guangrong | ca3a490 | 2012-08-21 11:01:50 +0800 | [diff] [blame] | 1272 | return KVM_HVA_ERR_BAD; |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1273 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1274 | if (memslot_is_readonly(slot) && write) |
| 1275 | return KVM_HVA_ERR_RO_BAD; |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1276 | |
| 1277 | if (nr_pages) |
| 1278 | *nr_pages = slot->npages - (gfn - slot->base_gfn); |
| 1279 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1280 | return __gfn_to_hva_memslot(slot, gfn); |
Izik Eidus | 539cb66 | 2007-11-11 22:05:04 +0200 | [diff] [blame] | 1281 | } |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1282 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1283 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1284 | gfn_t *nr_pages) |
| 1285 | { |
| 1286 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); |
| 1287 | } |
| 1288 | |
| 1289 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 1290 | gfn_t gfn) |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1291 | { |
| 1292 | return gfn_to_hva_many(slot, gfn, NULL); |
| 1293 | } |
| 1294 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); |
| 1295 | |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1296 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
| 1297 | { |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1298 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1299 | } |
Sheng Yang | 0d15029 | 2008-04-25 21:44:50 +0800 | [diff] [blame] | 1300 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
Izik Eidus | 539cb66 | 2007-11-11 22:05:04 +0200 | [diff] [blame] | 1301 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1302 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1303 | { |
| 1304 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); |
| 1305 | } |
| 1306 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); |
| 1307 | |
Xiao Guangrong | 86ab8cf | 2012-08-21 10:59:53 +0800 | [diff] [blame] | 1308 | /* |
Paolo Bonzini | ba6a354 | 2013-09-09 13:52:33 +0200 | [diff] [blame] | 1309 | * If writable is set to false, the hva returned by this function is only |
| 1310 | * allowed to be read. |
Xiao Guangrong | 86ab8cf | 2012-08-21 10:59:53 +0800 | [diff] [blame] | 1311 | */ |
Christoffer Dall | 64d8312 | 2014-08-19 12:15:00 +0200 | [diff] [blame] | 1312 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
| 1313 | gfn_t gfn, bool *writable) |
Gleb Natapov | 8030089 | 2010-10-19 18:13:41 +0200 | [diff] [blame] | 1314 | { |
Gleb Natapov | a2ac07f | 2013-10-01 19:58:36 +0300 | [diff] [blame] | 1315 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
| 1316 | |
| 1317 | if (!kvm_is_error_hva(hva) && writable) |
Paolo Bonzini | ba6a354 | 2013-09-09 13:52:33 +0200 | [diff] [blame] | 1318 | *writable = !memslot_is_readonly(slot); |
| 1319 | |
Gleb Natapov | a2ac07f | 2013-10-01 19:58:36 +0300 | [diff] [blame] | 1320 | return hva; |
Xiao Guangrong | 86ab8cf | 2012-08-21 10:59:53 +0800 | [diff] [blame] | 1321 | } |
| 1322 | |
Christoffer Dall | 64d8312 | 2014-08-19 12:15:00 +0200 | [diff] [blame] | 1323 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
| 1324 | { |
| 1325 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); |
| 1326 | |
| 1327 | return gfn_to_hva_memslot_prot(slot, gfn, writable); |
| 1328 | } |
| 1329 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1330 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) |
| 1331 | { |
| 1332 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 1333 | |
| 1334 | return gfn_to_hva_memslot_prot(slot, gfn, writable); |
| 1335 | } |
| 1336 | |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 1337 | static int get_user_page_nowait(unsigned long start, int write, |
| 1338 | struct page **page) |
Gleb Natapov | 0857b9e | 2011-02-01 13:21:47 +0200 | [diff] [blame] | 1339 | { |
| 1340 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; |
| 1341 | |
| 1342 | if (write) |
| 1343 | flags |= FOLL_WRITE; |
| 1344 | |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 1345 | return __get_user_pages(current, current->mm, start, 1, flags, page, |
| 1346 | NULL, NULL); |
Gleb Natapov | 0857b9e | 2011-02-01 13:21:47 +0200 | [diff] [blame] | 1347 | } |
| 1348 | |
Huang Ying | fafc3db | 2011-01-30 11:15:49 +0800 | [diff] [blame] | 1349 | static inline int check_user_page_hwpoison(unsigned long addr) |
| 1350 | { |
| 1351 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; |
| 1352 | |
| 1353 | rc = __get_user_pages(current, current->mm, addr, 1, |
| 1354 | flags, NULL, NULL, NULL); |
| 1355 | return rc == -EHWPOISON; |
| 1356 | } |
| 1357 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1358 | /* |
| 1359 | * The atomic path to get the writable pfn which will be stored in @pfn, |
| 1360 | * true indicates success, otherwise false is returned. |
| 1361 | */ |
| 1362 | 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] | 1363 | bool write_fault, bool *writable, kvm_pfn_t *pfn) |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1364 | { |
| 1365 | struct page *page[1]; |
| 1366 | int npages; |
| 1367 | |
| 1368 | if (!(async || atomic)) |
| 1369 | return false; |
| 1370 | |
Xiao Guangrong | 12ce13f | 2012-08-21 11:00:49 +0800 | [diff] [blame] | 1371 | /* |
| 1372 | * Fast pin a writable pfn only if it is a write fault request |
| 1373 | * or the caller allows to map a writable pfn for a read fault |
| 1374 | * request. |
| 1375 | */ |
| 1376 | if (!(write_fault || writable)) |
| 1377 | return false; |
| 1378 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1379 | npages = __get_user_pages_fast(addr, 1, 1, page); |
| 1380 | if (npages == 1) { |
| 1381 | *pfn = page_to_pfn(page[0]); |
| 1382 | |
| 1383 | if (writable) |
| 1384 | *writable = true; |
| 1385 | return true; |
| 1386 | } |
| 1387 | |
| 1388 | return false; |
| 1389 | } |
| 1390 | |
| 1391 | /* |
| 1392 | * The slow path to get the pfn of the specified host virtual address, |
| 1393 | * 1 indicates success, -errno is returned if error is detected. |
| 1394 | */ |
| 1395 | 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] | 1396 | bool *writable, kvm_pfn_t *pfn) |
Avi Kivity | 954bbbc | 2007-03-30 14:02:32 +0300 | [diff] [blame] | 1397 | { |
Anthony Liguori | 8d4e128 | 2007-10-18 09:59:34 -0500 | [diff] [blame] | 1398 | struct page *page[1]; |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 1399 | int npages = 0; |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1400 | |
| 1401 | might_sleep(); |
| 1402 | |
| 1403 | if (writable) |
| 1404 | *writable = write_fault; |
| 1405 | |
| 1406 | if (async) { |
| 1407 | down_read(¤t->mm->mmap_sem); |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 1408 | npages = get_user_page_nowait(addr, write_fault, page); |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1409 | up_read(¤t->mm->mmap_sem); |
Andrea Arcangeli | 0664e57 | 2015-02-11 15:27:28 -0800 | [diff] [blame] | 1410 | } else |
| 1411 | npages = __get_user_pages_unlocked(current, current->mm, addr, 1, |
| 1412 | write_fault, 0, page, |
| 1413 | FOLL_TOUCH|FOLL_HWPOISON); |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1414 | if (npages != 1) |
| 1415 | return npages; |
| 1416 | |
| 1417 | /* map read fault as writable if possible */ |
Xiao Guangrong | 12ce13f | 2012-08-21 11:00:49 +0800 | [diff] [blame] | 1418 | if (unlikely(!write_fault) && writable) { |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1419 | struct page *wpage[1]; |
| 1420 | |
| 1421 | npages = __get_user_pages_fast(addr, 1, 1, wpage); |
| 1422 | if (npages == 1) { |
| 1423 | *writable = true; |
| 1424 | put_page(page[0]); |
| 1425 | page[0] = wpage[0]; |
| 1426 | } |
| 1427 | |
| 1428 | npages = 1; |
| 1429 | } |
| 1430 | *pfn = page_to_pfn(page[0]); |
| 1431 | return npages; |
| 1432 | } |
| 1433 | |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1434 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
| 1435 | { |
| 1436 | if (unlikely(!(vma->vm_flags & VM_READ))) |
| 1437 | return false; |
| 1438 | |
| 1439 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
| 1440 | return false; |
| 1441 | |
| 1442 | return true; |
| 1443 | } |
| 1444 | |
Xiao Guangrong | 12ce13f | 2012-08-21 11:00:49 +0800 | [diff] [blame] | 1445 | /* |
| 1446 | * Pin guest page in memory and return its pfn. |
| 1447 | * @addr: host virtual address which maps memory to the guest |
| 1448 | * @atomic: whether this function can sleep |
| 1449 | * @async: whether this function need to wait IO complete if the |
| 1450 | * host page is not in the memory |
| 1451 | * @write_fault: whether we should get a writable host page |
| 1452 | * @writable: whether it allows to map a writable host page for !@write_fault |
| 1453 | * |
| 1454 | * The function will map a writable host page for these two cases: |
| 1455 | * 1): @write_fault = true |
| 1456 | * 2): @write_fault = false && @writable, @writable will tell the caller |
| 1457 | * whether the mapping is writable. |
| 1458 | */ |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1459 | 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] | 1460 | bool write_fault, bool *writable) |
| 1461 | { |
| 1462 | struct vm_area_struct *vma; |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1463 | kvm_pfn_t pfn = 0; |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1464 | int npages; |
Avi Kivity | 954bbbc | 2007-03-30 14:02:32 +0300 | [diff] [blame] | 1465 | |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 1466 | /* we can do it either atomically or asynchronously, not both */ |
| 1467 | BUG_ON(atomic && async); |
| 1468 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1469 | if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) |
| 1470 | return pfn; |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 1471 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1472 | if (atomic) |
| 1473 | return KVM_PFN_ERR_FAULT; |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 1474 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1475 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); |
| 1476 | if (npages == 1) |
| 1477 | return pfn; |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 1478 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1479 | down_read(¤t->mm->mmap_sem); |
| 1480 | if (npages == -EHWPOISON || |
| 1481 | (!async && check_user_page_hwpoison(addr))) { |
| 1482 | pfn = KVM_PFN_ERR_HWPOISON; |
| 1483 | goto exit; |
Xiao Guangrong | 887c08a | 2010-08-22 19:10:28 +0800 | [diff] [blame] | 1484 | } |
Izik Eidus | 539cb66 | 2007-11-11 22:05:04 +0200 | [diff] [blame] | 1485 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1486 | vma = find_vma_intersection(current->mm, addr, addr + 1); |
Anthony Liguori | 8d4e128 | 2007-10-18 09:59:34 -0500 | [diff] [blame] | 1487 | |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1488 | if (vma == NULL) |
| 1489 | pfn = KVM_PFN_ERR_FAULT; |
| 1490 | else if ((vma->vm_flags & VM_PFNMAP)) { |
| 1491 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + |
| 1492 | vma->vm_pgoff; |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1493 | BUG_ON(!kvm_is_reserved_pfn(pfn)); |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1494 | } else { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1495 | if (async && vma_is_valid(vma, write_fault)) |
Xiao Guangrong | 2fc8431 | 2012-08-21 11:00:22 +0800 | [diff] [blame] | 1496 | *async = true; |
| 1497 | pfn = KVM_PFN_ERR_FAULT; |
| 1498 | } |
| 1499 | exit: |
| 1500 | up_read(¤t->mm->mmap_sem); |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1501 | return pfn; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1502 | } |
| 1503 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1504 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1505 | bool atomic, bool *async, bool write_fault, |
| 1506 | bool *writable) |
Xiao Guangrong | 887c08a | 2010-08-22 19:10:28 +0800 | [diff] [blame] | 1507 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1508 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
| 1509 | |
Paolo Bonzini | b2740d3 | 2016-02-23 15:36:01 +0100 | [diff] [blame] | 1510 | if (addr == KVM_HVA_ERR_RO_BAD) { |
| 1511 | if (writable) |
| 1512 | *writable = false; |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1513 | return KVM_PFN_ERR_RO_FAULT; |
Paolo Bonzini | b2740d3 | 2016-02-23 15:36:01 +0100 | [diff] [blame] | 1514 | } |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1515 | |
Paolo Bonzini | b2740d3 | 2016-02-23 15:36:01 +0100 | [diff] [blame] | 1516 | if (kvm_is_error_hva(addr)) { |
| 1517 | if (writable) |
| 1518 | *writable = false; |
Xiao Guangrong | 81c52c5 | 2012-10-16 20:10:59 +0800 | [diff] [blame] | 1519 | return KVM_PFN_NOSLOT; |
Paolo Bonzini | b2740d3 | 2016-02-23 15:36:01 +0100 | [diff] [blame] | 1520 | } |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1521 | |
| 1522 | /* Do not map writable pfn in the readonly memslot. */ |
| 1523 | if (writable && memslot_is_readonly(slot)) { |
| 1524 | *writable = false; |
| 1525 | writable = NULL; |
| 1526 | } |
| 1527 | |
| 1528 | return hva_to_pfn(addr, atomic, async, write_fault, |
| 1529 | writable); |
Xiao Guangrong | 887c08a | 2010-08-22 19:10:28 +0800 | [diff] [blame] | 1530 | } |
Paolo Bonzini | 3520469 | 2015-04-02 11:20:48 +0200 | [diff] [blame] | 1531 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); |
Xiao Guangrong | 887c08a | 2010-08-22 19:10:28 +0800 | [diff] [blame] | 1532 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1533 | 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] | 1534 | bool *writable) |
| 1535 | { |
Paolo Bonzini | e37afc6 | 2015-05-19 16:09:04 +0200 | [diff] [blame] | 1536 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, |
| 1537 | write_fault, writable); |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 1538 | } |
| 1539 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); |
| 1540 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1541 | 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] | 1542 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1543 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
Marcelo Tosatti | 506f0d6 | 2009-12-23 14:35:19 -0200 | [diff] [blame] | 1544 | } |
Paolo Bonzini | e37afc6 | 2015-05-19 16:09:04 +0200 | [diff] [blame] | 1545 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); |
Marcelo Tosatti | 506f0d6 | 2009-12-23 14:35:19 -0200 | [diff] [blame] | 1546 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1547 | 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] | 1548 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 1549 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
Xiao Guangrong | 037d92d | 2012-08-21 10:59:12 +0800 | [diff] [blame] | 1550 | } |
| 1551 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
| 1552 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1553 | 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] | 1554 | { |
| 1555 | return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn); |
| 1556 | } |
| 1557 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); |
| 1558 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1559 | 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] | 1560 | { |
| 1561 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); |
| 1562 | } |
| 1563 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); |
| 1564 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1565 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
Paolo Bonzini | e37afc6 | 2015-05-19 16:09:04 +0200 | [diff] [blame] | 1566 | { |
| 1567 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); |
| 1568 | } |
| 1569 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
| 1570 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1571 | 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] | 1572 | { |
| 1573 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); |
| 1574 | } |
| 1575 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); |
| 1576 | |
Paolo Bonzini | d9ef13c | 2015-05-19 16:01:50 +0200 | [diff] [blame] | 1577 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1578 | struct page **pages, int nr_pages) |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1579 | { |
| 1580 | unsigned long addr; |
| 1581 | gfn_t entry; |
| 1582 | |
Paolo Bonzini | d9ef13c | 2015-05-19 16:01:50 +0200 | [diff] [blame] | 1583 | addr = gfn_to_hva_many(slot, gfn, &entry); |
Xiao Guangrong | 4898778 | 2010-08-22 19:11:43 +0800 | [diff] [blame] | 1584 | if (kvm_is_error_hva(addr)) |
| 1585 | return -1; |
| 1586 | |
| 1587 | if (entry < nr_pages) |
| 1588 | return 0; |
| 1589 | |
| 1590 | return __get_user_pages_fast(addr, nr_pages, 1, pages); |
| 1591 | } |
| 1592 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); |
| 1593 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1594 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1595 | { |
Xiao Guangrong | 81c52c5 | 2012-10-16 20:10:59 +0800 | [diff] [blame] | 1596 | if (is_error_noslot_pfn(pfn)) |
Xiao Guangrong | 6cede2e | 2012-08-03 15:41:22 +0800 | [diff] [blame] | 1597 | return KVM_ERR_PTR_BAD_PAGE; |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1598 | |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1599 | if (kvm_is_reserved_pfn(pfn)) { |
Xiao Guangrong | cb9aaa3 | 2012-08-03 15:42:10 +0800 | [diff] [blame] | 1600 | WARN_ON(1); |
| 1601 | return KVM_ERR_PTR_BAD_PAGE; |
| 1602 | } |
| 1603 | |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1604 | return pfn_to_page(pfn); |
| 1605 | } |
| 1606 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1607 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
| 1608 | { |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1609 | kvm_pfn_t pfn; |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1610 | |
| 1611 | pfn = gfn_to_pfn(kvm, gfn); |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1612 | |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1613 | return kvm_pfn_to_page(pfn); |
Avi Kivity | 954bbbc | 2007-03-30 14:02:32 +0300 | [diff] [blame] | 1614 | } |
| 1615 | EXPORT_SYMBOL_GPL(gfn_to_page); |
| 1616 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1617 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1618 | { |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1619 | kvm_pfn_t pfn; |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1620 | |
| 1621 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); |
| 1622 | |
| 1623 | return kvm_pfn_to_page(pfn); |
| 1624 | } |
| 1625 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); |
| 1626 | |
Izik Eidus | b4231d6 | 2007-11-20 11:49:33 +0200 | [diff] [blame] | 1627 | void kvm_release_page_clean(struct page *page) |
| 1628 | { |
Xiao Guangrong | 32cad84 | 2012-08-03 15:42:52 +0800 | [diff] [blame] | 1629 | WARN_ON(is_error_page(page)); |
| 1630 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1631 | kvm_release_pfn_clean(page_to_pfn(page)); |
Izik Eidus | b4231d6 | 2007-11-20 11:49:33 +0200 | [diff] [blame] | 1632 | } |
| 1633 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); |
| 1634 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1635 | void kvm_release_pfn_clean(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1636 | { |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1637 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1638 | put_page(pfn_to_page(pfn)); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1639 | } |
| 1640 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); |
| 1641 | |
Izik Eidus | b4231d6 | 2007-11-20 11:49:33 +0200 | [diff] [blame] | 1642 | void kvm_release_page_dirty(struct page *page) |
Izik Eidus | 8a7ae05 | 2007-10-18 11:09:33 +0200 | [diff] [blame] | 1643 | { |
Xiao Guangrong | a276632 | 2012-07-26 11:58:59 +0800 | [diff] [blame] | 1644 | WARN_ON(is_error_page(page)); |
| 1645 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1646 | kvm_release_pfn_dirty(page_to_pfn(page)); |
Izik Eidus | 8a7ae05 | 2007-10-18 11:09:33 +0200 | [diff] [blame] | 1647 | } |
Izik Eidus | b4231d6 | 2007-11-20 11:49:33 +0200 | [diff] [blame] | 1648 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); |
Izik Eidus | 8a7ae05 | 2007-10-18 11:09:33 +0200 | [diff] [blame] | 1649 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1650 | static void kvm_release_pfn_dirty(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1651 | { |
| 1652 | kvm_set_pfn_dirty(pfn); |
| 1653 | kvm_release_pfn_clean(pfn); |
| 1654 | } |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1655 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1656 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1657 | { |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1658 | if (!kvm_is_reserved_pfn(pfn)) { |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1659 | struct page *page = pfn_to_page(pfn); |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 1660 | |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1661 | if (!PageReserved(page)) |
| 1662 | SetPageDirty(page); |
| 1663 | } |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1664 | } |
| 1665 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
| 1666 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1667 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1668 | { |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1669 | if (!kvm_is_reserved_pfn(pfn)) |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1670 | mark_page_accessed(pfn_to_page(pfn)); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1671 | } |
| 1672 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); |
| 1673 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 1674 | void kvm_get_pfn(kvm_pfn_t pfn) |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1675 | { |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 1676 | if (!kvm_is_reserved_pfn(pfn)) |
Anthony Liguori | 2e2e373 | 2008-04-30 15:37:07 -0500 | [diff] [blame] | 1677 | get_page(pfn_to_page(pfn)); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 1678 | } |
| 1679 | EXPORT_SYMBOL_GPL(kvm_get_pfn); |
| 1680 | |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1681 | static int next_segment(unsigned long len, int offset) |
| 1682 | { |
| 1683 | if (len > PAGE_SIZE - offset) |
| 1684 | return PAGE_SIZE - offset; |
| 1685 | else |
| 1686 | return len; |
| 1687 | } |
| 1688 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1689 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1690 | void *data, int offset, int len) |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1691 | { |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1692 | int r; |
| 1693 | unsigned long addr; |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1694 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1695 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1696 | if (kvm_is_error_hva(addr)) |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1697 | return -EFAULT; |
Paolo Bonzini | 3180a7f | 2015-04-02 14:08:20 +0200 | [diff] [blame] | 1698 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1699 | if (r) |
| 1700 | return -EFAULT; |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1701 | return 0; |
| 1702 | } |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1703 | |
| 1704 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, |
| 1705 | int len) |
| 1706 | { |
| 1707 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); |
| 1708 | |
| 1709 | return __kvm_read_guest_page(slot, gfn, data, offset, len); |
| 1710 | } |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1711 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
| 1712 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1713 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, |
| 1714 | int offset, int len) |
| 1715 | { |
| 1716 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 1717 | |
| 1718 | return __kvm_read_guest_page(slot, gfn, data, offset, len); |
| 1719 | } |
| 1720 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); |
| 1721 | |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1722 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
| 1723 | { |
| 1724 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1725 | int seg; |
| 1726 | int offset = offset_in_page(gpa); |
| 1727 | int ret; |
| 1728 | |
| 1729 | while ((seg = next_segment(len, offset)) != 0) { |
| 1730 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); |
| 1731 | if (ret < 0) |
| 1732 | return ret; |
| 1733 | offset = 0; |
| 1734 | len -= seg; |
| 1735 | data += seg; |
| 1736 | ++gfn; |
| 1737 | } |
| 1738 | return 0; |
| 1739 | } |
| 1740 | EXPORT_SYMBOL_GPL(kvm_read_guest); |
| 1741 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1742 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) |
| 1743 | { |
| 1744 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1745 | int seg; |
| 1746 | int offset = offset_in_page(gpa); |
| 1747 | int ret; |
| 1748 | |
| 1749 | while ((seg = next_segment(len, offset)) != 0) { |
| 1750 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); |
| 1751 | if (ret < 0) |
| 1752 | return ret; |
| 1753 | offset = 0; |
| 1754 | len -= seg; |
| 1755 | data += seg; |
| 1756 | ++gfn; |
| 1757 | } |
| 1758 | return 0; |
| 1759 | } |
| 1760 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); |
| 1761 | |
| 1762 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
| 1763 | void *data, int offset, unsigned long len) |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1764 | { |
| 1765 | int r; |
| 1766 | unsigned long addr; |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1767 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1768 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1769 | if (kvm_is_error_hva(addr)) |
| 1770 | return -EFAULT; |
Andrea Arcangeli | 0aac03f | 2008-01-30 19:57:35 +0100 | [diff] [blame] | 1771 | pagefault_disable(); |
Paolo Bonzini | 3180a7f | 2015-04-02 14:08:20 +0200 | [diff] [blame] | 1772 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
Andrea Arcangeli | 0aac03f | 2008-01-30 19:57:35 +0100 | [diff] [blame] | 1773 | pagefault_enable(); |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1774 | if (r) |
| 1775 | return -EFAULT; |
| 1776 | return 0; |
| 1777 | } |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 1778 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1779 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
| 1780 | unsigned long len) |
| 1781 | { |
| 1782 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1783 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); |
| 1784 | int offset = offset_in_page(gpa); |
| 1785 | |
| 1786 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); |
| 1787 | } |
| 1788 | EXPORT_SYMBOL_GPL(kvm_read_guest_atomic); |
| 1789 | |
| 1790 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, |
| 1791 | void *data, unsigned long len) |
| 1792 | { |
| 1793 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1794 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 1795 | int offset = offset_in_page(gpa); |
| 1796 | |
| 1797 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); |
| 1798 | } |
| 1799 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); |
| 1800 | |
| 1801 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, |
| 1802 | const void *data, int offset, int len) |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1803 | { |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1804 | int r; |
| 1805 | unsigned long addr; |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1806 | |
Radim Krčmář | 251eb84 | 2015-04-10 21:47:27 +0200 | [diff] [blame] | 1807 | addr = gfn_to_hva_memslot(memslot, gfn); |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1808 | if (kvm_is_error_hva(addr)) |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1809 | return -EFAULT; |
Xiao Guangrong | 8b0cedf | 2011-05-15 23:22:04 +0800 | [diff] [blame] | 1810 | r = __copy_to_user((void __user *)addr + offset, data, len); |
Izik Eidus | e0506bc | 2007-11-11 22:10:22 +0200 | [diff] [blame] | 1811 | if (r) |
| 1812 | return -EFAULT; |
Paolo Bonzini | bc009e4 | 2015-05-26 12:43:41 +0200 | [diff] [blame] | 1813 | mark_page_dirty_in_slot(memslot, gfn); |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1814 | return 0; |
| 1815 | } |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1816 | |
| 1817 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, |
| 1818 | const void *data, int offset, int len) |
| 1819 | { |
| 1820 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); |
| 1821 | |
| 1822 | return __kvm_write_guest_page(slot, gfn, data, offset, len); |
| 1823 | } |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1824 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
| 1825 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1826 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 1827 | const void *data, int offset, int len) |
| 1828 | { |
| 1829 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 1830 | |
| 1831 | return __kvm_write_guest_page(slot, gfn, data, offset, len); |
| 1832 | } |
| 1833 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); |
| 1834 | |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1835 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
| 1836 | unsigned long len) |
| 1837 | { |
| 1838 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1839 | int seg; |
| 1840 | int offset = offset_in_page(gpa); |
| 1841 | int ret; |
| 1842 | |
| 1843 | while ((seg = next_segment(len, offset)) != 0) { |
| 1844 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); |
| 1845 | if (ret < 0) |
| 1846 | return ret; |
| 1847 | offset = 0; |
| 1848 | len -= seg; |
| 1849 | data += seg; |
| 1850 | ++gfn; |
| 1851 | } |
| 1852 | return 0; |
| 1853 | } |
Wincy Van | ff651cb | 2014-12-11 08:52:58 +0300 | [diff] [blame] | 1854 | EXPORT_SYMBOL_GPL(kvm_write_guest); |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1855 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 1856 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, |
| 1857 | unsigned long len) |
| 1858 | { |
| 1859 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1860 | int seg; |
| 1861 | int offset = offset_in_page(gpa); |
| 1862 | int ret; |
| 1863 | |
| 1864 | while ((seg = next_segment(len, offset)) != 0) { |
| 1865 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); |
| 1866 | if (ret < 0) |
| 1867 | return ret; |
| 1868 | offset = 0; |
| 1869 | len -= seg; |
| 1870 | data += seg; |
| 1871 | ++gfn; |
| 1872 | } |
| 1873 | return 0; |
| 1874 | } |
| 1875 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); |
| 1876 | |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1877 | 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] | 1878 | gpa_t gpa, unsigned long len) |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1879 | { |
| 1880 | struct kvm_memslots *slots = kvm_memslots(kvm); |
| 1881 | int offset = offset_in_page(gpa); |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1882 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
| 1883 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; |
| 1884 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; |
| 1885 | gfn_t nr_pages_avail; |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1886 | |
| 1887 | ghc->gpa = gpa; |
| 1888 | ghc->generation = slots->generation; |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1889 | ghc->len = len; |
| 1890 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); |
Radim Krčmář | ca3f087 | 2015-04-08 14:16:48 +0200 | [diff] [blame] | 1891 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL); |
| 1892 | if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) { |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1893 | ghc->hva += offset; |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1894 | } else { |
| 1895 | /* |
| 1896 | * If the requested region crosses two memslots, we still |
| 1897 | * verify that the entire region is valid here. |
| 1898 | */ |
| 1899 | while (start_gfn <= end_gfn) { |
| 1900 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); |
| 1901 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, |
| 1902 | &nr_pages_avail); |
| 1903 | if (kvm_is_error_hva(ghc->hva)) |
| 1904 | return -EFAULT; |
| 1905 | start_gfn += nr_pages_avail; |
| 1906 | } |
| 1907 | /* Use the slow path for cross page reads and writes. */ |
| 1908 | ghc->memslot = NULL; |
| 1909 | } |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1910 | return 0; |
| 1911 | } |
| 1912 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); |
| 1913 | |
| 1914 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
| 1915 | void *data, unsigned long len) |
| 1916 | { |
| 1917 | struct kvm_memslots *slots = kvm_memslots(kvm); |
| 1918 | int r; |
| 1919 | |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1920 | BUG_ON(len > ghc->len); |
| 1921 | |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1922 | if (slots->generation != ghc->generation) |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1923 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
| 1924 | |
| 1925 | if (unlikely(!ghc->memslot)) |
| 1926 | return kvm_write_guest(kvm, ghc->gpa, data, len); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1927 | |
| 1928 | if (kvm_is_error_hva(ghc->hva)) |
| 1929 | return -EFAULT; |
| 1930 | |
Xiao Guangrong | 8b0cedf | 2011-05-15 23:22:04 +0800 | [diff] [blame] | 1931 | r = __copy_to_user((void __user *)ghc->hva, data, len); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1932 | if (r) |
| 1933 | return -EFAULT; |
Paolo Bonzini | bc009e4 | 2015-05-26 12:43:41 +0200 | [diff] [blame] | 1934 | mark_page_dirty_in_slot(ghc->memslot, ghc->gpa >> PAGE_SHIFT); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 1935 | |
| 1936 | return 0; |
| 1937 | } |
| 1938 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); |
| 1939 | |
Gleb Natapov | e03b644 | 2011-07-11 15:28:11 -0400 | [diff] [blame] | 1940 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
| 1941 | void *data, unsigned long len) |
| 1942 | { |
| 1943 | struct kvm_memslots *slots = kvm_memslots(kvm); |
| 1944 | int r; |
| 1945 | |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1946 | BUG_ON(len > ghc->len); |
| 1947 | |
Gleb Natapov | e03b644 | 2011-07-11 15:28:11 -0400 | [diff] [blame] | 1948 | if (slots->generation != ghc->generation) |
Andrew Honig | 8f96452 | 2013-03-29 09:35:21 -0700 | [diff] [blame] | 1949 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
| 1950 | |
| 1951 | if (unlikely(!ghc->memslot)) |
| 1952 | return kvm_read_guest(kvm, ghc->gpa, data, len); |
Gleb Natapov | e03b644 | 2011-07-11 15:28:11 -0400 | [diff] [blame] | 1953 | |
| 1954 | if (kvm_is_error_hva(ghc->hva)) |
| 1955 | return -EFAULT; |
| 1956 | |
| 1957 | r = __copy_from_user(data, (void __user *)ghc->hva, len); |
| 1958 | if (r) |
| 1959 | return -EFAULT; |
| 1960 | |
| 1961 | return 0; |
| 1962 | } |
| 1963 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); |
| 1964 | |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1965 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
| 1966 | { |
Heiko Carstens | 8a3caa6 | 2013-11-18 10:35:55 +0100 | [diff] [blame] | 1967 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
| 1968 | |
| 1969 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1970 | } |
| 1971 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); |
| 1972 | |
| 1973 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) |
| 1974 | { |
| 1975 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1976 | int seg; |
| 1977 | int offset = offset_in_page(gpa); |
| 1978 | int ret; |
| 1979 | |
Kevin Mulvey | bfda0e8 | 2015-02-20 08:21:36 -0500 | [diff] [blame] | 1980 | while ((seg = next_segment(len, offset)) != 0) { |
Izik Eidus | 195aefd | 2007-10-01 22:14:18 +0200 | [diff] [blame] | 1981 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
| 1982 | if (ret < 0) |
| 1983 | return ret; |
| 1984 | offset = 0; |
| 1985 | len -= seg; |
| 1986 | ++gfn; |
| 1987 | } |
| 1988 | return 0; |
| 1989 | } |
| 1990 | EXPORT_SYMBOL_GPL(kvm_clear_guest); |
| 1991 | |
Paolo Bonzini | bc009e4 | 2015-05-26 12:43:41 +0200 | [diff] [blame] | 1992 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 1993 | gfn_t gfn) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1994 | { |
Rusty Russell | 7e9d619 | 2007-07-31 20:41:14 +1000 | [diff] [blame] | 1995 | if (memslot && memslot->dirty_bitmap) { |
| 1996 | unsigned long rel_gfn = gfn - memslot->base_gfn; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1997 | |
Takuya Yoshikawa | b74ca3b | 2012-10-04 17:13:12 -0700 | [diff] [blame] | 1998 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1999 | } |
| 2000 | } |
| 2001 | |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 2002 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
| 2003 | { |
| 2004 | struct kvm_memory_slot *memslot; |
| 2005 | |
| 2006 | memslot = gfn_to_memslot(kvm, gfn); |
Paolo Bonzini | bc009e4 | 2015-05-26 12:43:41 +0200 | [diff] [blame] | 2007 | mark_page_dirty_in_slot(memslot, gfn); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 2008 | } |
Aneesh Kumar K.V | 2ba9f0d | 2013-10-07 22:17:59 +0530 | [diff] [blame] | 2009 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
Gleb Natapov | 49c7754 | 2010-10-18 15:22:23 +0200 | [diff] [blame] | 2010 | |
Paolo Bonzini | 8e73485 | 2015-05-17 13:58:53 +0200 | [diff] [blame] | 2011 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 2012 | { |
| 2013 | struct kvm_memory_slot *memslot; |
| 2014 | |
| 2015 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 2016 | mark_page_dirty_in_slot(memslot, gfn); |
| 2017 | } |
| 2018 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); |
| 2019 | |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2020 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) |
| 2021 | { |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2022 | unsigned int old, val, grow; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2023 | |
Wanpeng Li | 2cbd782 | 2015-09-03 22:07:39 +0800 | [diff] [blame] | 2024 | old = val = vcpu->halt_poll_ns; |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2025 | grow = READ_ONCE(halt_poll_ns_grow); |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2026 | /* 10us base */ |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2027 | if (val == 0 && grow) |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2028 | val = 10000; |
| 2029 | else |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2030 | val *= grow; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2031 | |
David Matlack | 313f636 | 2016-03-08 16:19:44 -0800 | [diff] [blame] | 2032 | if (val > halt_poll_ns) |
| 2033 | val = halt_poll_ns; |
| 2034 | |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2035 | vcpu->halt_poll_ns = val; |
Wanpeng Li | 2cbd782 | 2015-09-03 22:07:39 +0800 | [diff] [blame] | 2036 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2037 | } |
| 2038 | |
| 2039 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) |
| 2040 | { |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2041 | unsigned int old, val, shrink; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2042 | |
Wanpeng Li | 2cbd782 | 2015-09-03 22:07:39 +0800 | [diff] [blame] | 2043 | old = val = vcpu->halt_poll_ns; |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2044 | shrink = READ_ONCE(halt_poll_ns_shrink); |
| 2045 | if (shrink == 0) |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2046 | val = 0; |
| 2047 | else |
Christian Borntraeger | 6b6de68 | 2016-02-09 13:47:55 +0100 | [diff] [blame] | 2048 | val /= shrink; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2049 | |
| 2050 | vcpu->halt_poll_ns = val; |
Wanpeng Li | 2cbd782 | 2015-09-03 22:07:39 +0800 | [diff] [blame] | 2051 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2052 | } |
| 2053 | |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2054 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) |
| 2055 | { |
| 2056 | if (kvm_arch_vcpu_runnable(vcpu)) { |
| 2057 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
| 2058 | return -EINTR; |
| 2059 | } |
| 2060 | if (kvm_cpu_has_pending_timer(vcpu)) |
| 2061 | return -EINTR; |
| 2062 | if (signal_pending(current)) |
| 2063 | return -EINTR; |
| 2064 | |
| 2065 | return 0; |
| 2066 | } |
| 2067 | |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2068 | /* |
| 2069 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. |
| 2070 | */ |
Hollis Blanchard | 8776e51 | 2007-10-31 17:24:24 -0500 | [diff] [blame] | 2071 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2072 | { |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2073 | ktime_t start, cur; |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2074 | DECLARE_SWAITQUEUE(wait); |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2075 | bool waited = false; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2076 | u64 block_ns; |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2077 | |
| 2078 | start = cur = ktime_get(); |
Wanpeng Li | 19020f8 | 2015-09-03 22:07:37 +0800 | [diff] [blame] | 2079 | if (vcpu->halt_poll_ns) { |
| 2080 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 2081 | |
Paolo Bonzini | 62bea5b | 2015-09-15 18:27:57 +0200 | [diff] [blame] | 2082 | ++vcpu->stat.halt_attempted_poll; |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2083 | do { |
| 2084 | /* |
| 2085 | * This sets KVM_REQ_UNHALT if an interrupt |
| 2086 | * arrives. |
| 2087 | */ |
| 2088 | if (kvm_vcpu_check_block(vcpu) < 0) { |
| 2089 | ++vcpu->stat.halt_successful_poll; |
Christian Borntraeger | 3491caf | 2016-05-13 12:16:35 +0200 | [diff] [blame] | 2090 | if (!vcpu_valid_wakeup(vcpu)) |
| 2091 | ++vcpu->stat.halt_poll_invalid; |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2092 | goto out; |
| 2093 | } |
| 2094 | cur = ktime_get(); |
| 2095 | } while (single_task_running() && ktime_before(cur, stop)); |
| 2096 | } |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2097 | |
Christoffer Dall | 3217f7c | 2015-08-27 16:41:15 +0200 | [diff] [blame] | 2098 | kvm_arch_vcpu_blocking(vcpu); |
| 2099 | |
Marcelo Tosatti | e5c239c | 2008-05-08 19:47:01 -0300 | [diff] [blame] | 2100 | for (;;) { |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2101 | prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2102 | |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2103 | if (kvm_vcpu_check_block(vcpu) < 0) |
Marcelo Tosatti | e5c239c | 2008-05-08 19:47:01 -0300 | [diff] [blame] | 2104 | break; |
| 2105 | |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2106 | waited = true; |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2107 | schedule(); |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2108 | } |
| 2109 | |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2110 | finish_swait(&vcpu->wq, &wait); |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2111 | cur = ktime_get(); |
| 2112 | |
Christoffer Dall | 3217f7c | 2015-08-27 16:41:15 +0200 | [diff] [blame] | 2113 | kvm_arch_vcpu_unblocking(vcpu); |
Paolo Bonzini | f781951 | 2015-02-04 18:20:58 +0100 | [diff] [blame] | 2114 | out: |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2115 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); |
| 2116 | |
Christian Borntraeger | 2086d32 | 2016-05-17 10:49:22 +0200 | [diff] [blame] | 2117 | if (!vcpu_valid_wakeup(vcpu)) |
| 2118 | shrink_halt_poll_ns(vcpu); |
| 2119 | else if (halt_poll_ns) { |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2120 | if (block_ns <= vcpu->halt_poll_ns) |
| 2121 | ; |
| 2122 | /* we had a long block, shrink polling */ |
Christian Borntraeger | 2086d32 | 2016-05-17 10:49:22 +0200 | [diff] [blame] | 2123 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2124 | shrink_halt_poll_ns(vcpu); |
| 2125 | /* we had a short halt and our poll time is too small */ |
| 2126 | else if (vcpu->halt_poll_ns < halt_poll_ns && |
| 2127 | block_ns < halt_poll_ns) |
| 2128 | grow_halt_poll_ns(vcpu); |
Wanpeng Li | edb9272 | 2015-09-14 17:38:51 +0800 | [diff] [blame] | 2129 | } else |
| 2130 | vcpu->halt_poll_ns = 0; |
Wanpeng Li | aca6ff2 | 2015-09-03 22:07:38 +0800 | [diff] [blame] | 2131 | |
Christian Borntraeger | 3491caf | 2016-05-13 12:16:35 +0200 | [diff] [blame] | 2132 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); |
| 2133 | kvm_arch_vcpu_block_finish(vcpu); |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2134 | } |
Aneesh Kumar K.V | 2ba9f0d | 2013-10-07 22:17:59 +0530 | [diff] [blame] | 2135 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
Eddie Dong | b6958ce | 2007-07-18 12:15:21 +0300 | [diff] [blame] | 2136 | |
Marcelo Tosatti | 8c84780 | 2012-03-14 17:58:48 -0300 | [diff] [blame] | 2137 | #ifndef CONFIG_S390 |
Radim Krčmář | dd1a4cc | 2016-05-04 14:09:44 -0500 | [diff] [blame] | 2138 | void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2139 | { |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2140 | struct swait_queue_head *wqp; |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2141 | |
| 2142 | wqp = kvm_arch_vcpu_wq(vcpu); |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2143 | if (swait_active(wqp)) { |
| 2144 | swake_up(wqp); |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2145 | ++vcpu->stat.halt_wakeup; |
| 2146 | } |
| 2147 | |
Radim Krčmář | dd1a4cc | 2016-05-04 14:09:44 -0500 | [diff] [blame] | 2148 | } |
| 2149 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); |
| 2150 | |
| 2151 | /* |
| 2152 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. |
| 2153 | */ |
| 2154 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) |
| 2155 | { |
| 2156 | int me; |
| 2157 | int cpu = vcpu->cpu; |
| 2158 | |
| 2159 | kvm_vcpu_wake_up(vcpu); |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2160 | me = get_cpu(); |
| 2161 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) |
| 2162 | if (kvm_arch_vcpu_should_kick(vcpu)) |
| 2163 | smp_send_reschedule(cpu); |
| 2164 | put_cpu(); |
| 2165 | } |
Yang Zhang | a20ed54 | 2013-04-11 19:25:15 +0800 | [diff] [blame] | 2166 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
Marcelo Tosatti | 8c84780 | 2012-03-14 17:58:48 -0300 | [diff] [blame] | 2167 | #endif /* !CONFIG_S390 */ |
Christoffer Dall | b6d3383 | 2012-03-08 16:44:24 -0500 | [diff] [blame] | 2168 | |
Dan Carpenter | fa93384 | 2014-05-23 13:20:42 +0300 | [diff] [blame] | 2169 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2170 | { |
| 2171 | struct pid *pid; |
| 2172 | struct task_struct *task = NULL; |
Dan Carpenter | fa93384 | 2014-05-23 13:20:42 +0300 | [diff] [blame] | 2173 | int ret = 0; |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2174 | |
| 2175 | rcu_read_lock(); |
| 2176 | pid = rcu_dereference(target->pid); |
| 2177 | if (pid) |
Sam Bobroff | 27fbe64b | 2014-09-19 09:40:41 +1000 | [diff] [blame] | 2178 | task = get_pid_task(pid, PIDTYPE_PID); |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2179 | rcu_read_unlock(); |
| 2180 | if (!task) |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2181 | return ret; |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2182 | ret = yield_to(task, 1); |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2183 | put_task_struct(task); |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2184 | |
| 2185 | return ret; |
Konstantin Weitz | 41628d3 | 2012-04-25 15:30:38 +0200 | [diff] [blame] | 2186 | } |
| 2187 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); |
| 2188 | |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2189 | /* |
| 2190 | * Helper that checks whether a VCPU is eligible for directed yield. |
| 2191 | * Most eligible candidate to yield is decided by following heuristics: |
| 2192 | * |
| 2193 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently |
| 2194 | * (preempted lock holder), indicated by @in_spin_loop. |
| 2195 | * Set at the beiginning and cleared at the end of interception/PLE handler. |
| 2196 | * |
| 2197 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get |
| 2198 | * chance last time (mostly it has become eligible now since we have probably |
| 2199 | * yielded to lockholder in last iteration. This is done by toggling |
| 2200 | * @dy_eligible each time a VCPU checked for eligibility.) |
| 2201 | * |
| 2202 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding |
| 2203 | * to preempted lock-holder could result in wrong VCPU selection and CPU |
| 2204 | * burning. Giving priority for a potential lock-holder increases lock |
| 2205 | * progress. |
| 2206 | * |
| 2207 | * Since algorithm is based on heuristics, accessing another VCPU data without |
| 2208 | * locking does not harm. It may result in trying to yield to same VCPU, fail |
| 2209 | * and continue with next VCPU and so on. |
| 2210 | */ |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 2211 | 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] | 2212 | { |
Scott Wood | 4a55dd7 | 2014-01-09 18:43:16 -0600 | [diff] [blame] | 2213 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2214 | bool eligible; |
| 2215 | |
| 2216 | eligible = !vcpu->spin_loop.in_spin_loop || |
Christian Borntraeger | 3465611 | 2014-09-04 21:13:31 +0200 | [diff] [blame] | 2217 | vcpu->spin_loop.dy_eligible; |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2218 | |
| 2219 | if (vcpu->spin_loop.in_spin_loop) |
| 2220 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); |
| 2221 | |
| 2222 | return eligible; |
Scott Wood | 4a55dd7 | 2014-01-09 18:43:16 -0600 | [diff] [blame] | 2223 | #else |
| 2224 | return true; |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2225 | #endif |
Scott Wood | 4a55dd7 | 2014-01-09 18:43:16 -0600 | [diff] [blame] | 2226 | } |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2227 | |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2228 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
Zhai, Edwin | d255f4f | 2009-10-09 18:03:20 +0800 | [diff] [blame] | 2229 | { |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2230 | struct kvm *kvm = me->kvm; |
| 2231 | struct kvm_vcpu *vcpu; |
| 2232 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; |
| 2233 | int yielded = 0; |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2234 | int try = 3; |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2235 | int pass; |
| 2236 | int i; |
Zhai, Edwin | d255f4f | 2009-10-09 18:03:20 +0800 | [diff] [blame] | 2237 | |
Raghavendra K T | 4c08849 | 2012-07-18 19:07:46 +0530 | [diff] [blame] | 2238 | kvm_vcpu_set_in_spin_loop(me, true); |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2239 | /* |
| 2240 | * We boost the priority of a VCPU that is runnable but not |
| 2241 | * currently running, because it got preempted by something |
| 2242 | * else and called schedule in __vcpu_run. Hopefully that |
| 2243 | * VCPU is holding the lock that we need and will release it. |
| 2244 | * We approximate round-robin by starting at the last boosted VCPU. |
| 2245 | */ |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2246 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2247 | kvm_for_each_vcpu(i, vcpu, kvm) { |
Rik van Riel | 5cfc2aa | 2012-06-19 16:51:04 -0400 | [diff] [blame] | 2248 | if (!pass && i <= last_boosted_vcpu) { |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2249 | i = last_boosted_vcpu; |
| 2250 | continue; |
| 2251 | } else if (pass && i > last_boosted_vcpu) |
| 2252 | break; |
Raghavendra K T | 7bc7ae2 | 2013-03-04 23:32:27 +0530 | [diff] [blame] | 2253 | if (!ACCESS_ONCE(vcpu->preempted)) |
| 2254 | continue; |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2255 | if (vcpu == me) |
| 2256 | continue; |
Marcelo Tosatti | 8577370 | 2016-02-19 09:46:39 +0100 | [diff] [blame] | 2257 | if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu)) |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2258 | continue; |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2259 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
| 2260 | continue; |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2261 | |
| 2262 | yielded = kvm_vcpu_yield_to(vcpu); |
| 2263 | if (yielded > 0) { |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2264 | kvm->last_boosted_vcpu = i; |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2265 | break; |
Raghavendra K T | c45c528 | 2013-01-22 13:09:24 +0530 | [diff] [blame] | 2266 | } else if (yielded < 0) { |
| 2267 | try--; |
| 2268 | if (!try) |
| 2269 | break; |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2270 | } |
Rik van Riel | 217ece6 | 2011-02-01 09:53:28 -0500 | [diff] [blame] | 2271 | } |
| 2272 | } |
Raghavendra K T | 4c08849 | 2012-07-18 19:07:46 +0530 | [diff] [blame] | 2273 | kvm_vcpu_set_in_spin_loop(me, false); |
Raghavendra K T | 06e48c5 | 2012-07-19 15:17:52 +0530 | [diff] [blame] | 2274 | |
| 2275 | /* Ensure vcpu is not eligible during next spinloop */ |
| 2276 | kvm_vcpu_set_dy_eligible(me, false); |
Zhai, Edwin | d255f4f | 2009-10-09 18:03:20 +0800 | [diff] [blame] | 2277 | } |
| 2278 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); |
| 2279 | |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2280 | 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] | 2281 | { |
| 2282 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2283 | struct page *page; |
| 2284 | |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2285 | if (vmf->pgoff == 0) |
Avi Kivity | 039576c | 2007-03-20 12:46:50 +0200 | [diff] [blame] | 2286 | page = virt_to_page(vcpu->run); |
Avi Kivity | 0956676 | 2008-01-23 18:14:23 +0200 | [diff] [blame] | 2287 | #ifdef CONFIG_X86 |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2288 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2289 | page = virt_to_page(vcpu->arch.pio_data); |
Avi Kivity | 0956676 | 2008-01-23 18:14:23 +0200 | [diff] [blame] | 2290 | #endif |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2291 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 2292 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
| 2293 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); |
| 2294 | #endif |
Avi Kivity | 039576c | 2007-03-20 12:46:50 +0200 | [diff] [blame] | 2295 | else |
Carsten Otte | 5b1c149 | 2012-01-04 10:25:23 +0100 | [diff] [blame] | 2296 | return kvm_arch_vcpu_fault(vcpu, vmf); |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2297 | get_page(page); |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2298 | vmf->page = page; |
| 2299 | return 0; |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2300 | } |
| 2301 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 2302 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
npiggin@suse.de | e4a533a | 2007-12-05 18:15:52 +1100 | [diff] [blame] | 2303 | .fault = kvm_vcpu_fault, |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2304 | }; |
| 2305 | |
| 2306 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) |
| 2307 | { |
| 2308 | vma->vm_ops = &kvm_vcpu_vm_ops; |
| 2309 | return 0; |
| 2310 | } |
| 2311 | |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2312 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
| 2313 | { |
| 2314 | struct kvm_vcpu *vcpu = filp->private_data; |
| 2315 | |
Al Viro | 66c0b39 | 2008-04-19 20:33:56 +0100 | [diff] [blame] | 2316 | kvm_put_kvm(vcpu->kvm); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2317 | return 0; |
| 2318 | } |
| 2319 | |
Christian Borntraeger | 3d3aab1 | 2008-12-02 11:17:32 +0100 | [diff] [blame] | 2320 | static struct file_operations kvm_vcpu_fops = { |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2321 | .release = kvm_vcpu_release, |
| 2322 | .unlocked_ioctl = kvm_vcpu_ioctl, |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 2323 | #ifdef CONFIG_KVM_COMPAT |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2324 | .compat_ioctl = kvm_vcpu_compat_ioctl, |
| 2325 | #endif |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2326 | .mmap = kvm_vcpu_mmap, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2327 | .llseek = noop_llseek, |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2328 | }; |
| 2329 | |
| 2330 | /* |
| 2331 | * Allocates an inode for the vcpu. |
| 2332 | */ |
| 2333 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) |
| 2334 | { |
Yann Droneaud | 24009b0 | 2013-08-24 22:14:07 +0200 | [diff] [blame] | 2335 | 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] | 2336 | } |
| 2337 | |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2338 | /* |
| 2339 | * Creates some virtual cpus. Good luck creating more than one. |
| 2340 | */ |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2341 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2342 | { |
| 2343 | int r; |
David Hildenbrand | e09fefd | 2015-11-05 09:03:50 +0100 | [diff] [blame] | 2344 | struct kvm_vcpu *vcpu; |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2345 | |
Greg Kurz | 0b1b1df | 2016-05-09 18:13:37 +0200 | [diff] [blame] | 2346 | if (id >= KVM_MAX_VCPU_ID) |
Andy Honig | 338c7db | 2013-11-18 16:09:22 -0800 | [diff] [blame] | 2347 | return -EINVAL; |
| 2348 | |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2349 | vcpu = kvm_arch_vcpu_create(kvm, id); |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 2350 | if (IS_ERR(vcpu)) |
| 2351 | return PTR_ERR(vcpu); |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2352 | |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 2353 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
| 2354 | |
Avi Kivity | 26e5215 | 2007-11-20 15:30:24 +0200 | [diff] [blame] | 2355 | r = kvm_arch_vcpu_setup(vcpu); |
| 2356 | if (r) |
Jan Kiszka | d780592 | 2011-05-23 10:33:05 +0200 | [diff] [blame] | 2357 | goto vcpu_destroy; |
Avi Kivity | 26e5215 | 2007-11-20 15:30:24 +0200 | [diff] [blame] | 2358 | |
Shaohua Li | 11ec280 | 2007-07-23 14:51:37 +0800 | [diff] [blame] | 2359 | mutex_lock(&kvm->lock); |
Avi Kivity | 3e51570 | 2012-03-05 14:23:29 +0200 | [diff] [blame] | 2360 | if (!kvm_vcpu_compatible(vcpu)) { |
| 2361 | r = -EINVAL; |
| 2362 | goto unlock_vcpu_destroy; |
| 2363 | } |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2364 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
| 2365 | r = -EINVAL; |
Jan Kiszka | d780592 | 2011-05-23 10:33:05 +0200 | [diff] [blame] | 2366 | goto unlock_vcpu_destroy; |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 2367 | } |
David Hildenbrand | e09fefd | 2015-11-05 09:03:50 +0100 | [diff] [blame] | 2368 | if (kvm_get_vcpu_by_id(kvm, id)) { |
| 2369 | r = -EEXIST; |
| 2370 | goto unlock_vcpu_destroy; |
| 2371 | } |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2372 | |
| 2373 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); |
Rusty Russell | fb3f0f5 | 2007-07-27 17:16:56 +1000 | [diff] [blame] | 2374 | |
| 2375 | /* Now it's all set up, let userspace reach it */ |
Al Viro | 66c0b39 | 2008-04-19 20:33:56 +0100 | [diff] [blame] | 2376 | kvm_get_kvm(kvm); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2377 | r = create_vcpu_fd(vcpu); |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2378 | if (r < 0) { |
| 2379 | kvm_put_kvm(kvm); |
Jan Kiszka | d780592 | 2011-05-23 10:33:05 +0200 | [diff] [blame] | 2380 | goto unlock_vcpu_destroy; |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2381 | } |
| 2382 | |
| 2383 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; |
Paolo Bonzini | dd48924 | 2015-07-29 11:32:20 +0200 | [diff] [blame] | 2384 | |
| 2385 | /* |
| 2386 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus |
| 2387 | * before kvm->online_vcpu's incremented value. |
| 2388 | */ |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2389 | smp_wmb(); |
| 2390 | atomic_inc(&kvm->online_vcpus); |
| 2391 | |
Gleb Natapov | 73880c8 | 2009-06-09 15:56:28 +0300 | [diff] [blame] | 2392 | mutex_unlock(&kvm->lock); |
Marcelo Tosatti | 42897d8 | 2012-11-27 23:29:02 -0200 | [diff] [blame] | 2393 | kvm_arch_vcpu_postcreate(vcpu); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2394 | return r; |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2395 | |
Jan Kiszka | d780592 | 2011-05-23 10:33:05 +0200 | [diff] [blame] | 2396 | unlock_vcpu_destroy: |
Glauber Costa | 7d8fece | 2008-09-17 23:16:59 -0300 | [diff] [blame] | 2397 | mutex_unlock(&kvm->lock); |
Jan Kiszka | d780592 | 2011-05-23 10:33:05 +0200 | [diff] [blame] | 2398 | vcpu_destroy: |
Hollis Blanchard | d40ccc6 | 2007-11-19 14:04:43 -0600 | [diff] [blame] | 2399 | kvm_arch_vcpu_destroy(vcpu); |
Avi Kivity | c5ea766 | 2007-02-20 18:41:05 +0200 | [diff] [blame] | 2400 | return r; |
| 2401 | } |
| 2402 | |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2403 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
| 2404 | { |
| 2405 | if (sigset) { |
| 2406 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
| 2407 | vcpu->sigset_active = 1; |
| 2408 | vcpu->sigset = *sigset; |
| 2409 | } else |
| 2410 | vcpu->sigset_active = 0; |
| 2411 | return 0; |
| 2412 | } |
| 2413 | |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2414 | static long kvm_vcpu_ioctl(struct file *filp, |
| 2415 | unsigned int ioctl, unsigned long arg) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2416 | { |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2417 | struct kvm_vcpu *vcpu = filp->private_data; |
Al Viro | 2f366987 | 2007-02-09 16:38:35 +0000 | [diff] [blame] | 2418 | void __user *argp = (void __user *)arg; |
Carsten Otte | 313a3dc | 2007-10-11 19:16:52 +0200 | [diff] [blame] | 2419 | int r; |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2420 | struct kvm_fpu *fpu = NULL; |
| 2421 | struct kvm_sregs *kvm_sregs = NULL; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2422 | |
Avi Kivity | 6d4e4c4 | 2007-11-21 16:41:05 +0200 | [diff] [blame] | 2423 | if (vcpu->kvm->mm != current->mm) |
| 2424 | return -EIO; |
Avi Kivity | 2122ff5 | 2010-05-13 11:25:04 +0300 | [diff] [blame] | 2425 | |
David Matlack | 2ea75be | 2014-09-19 16:03:25 -0700 | [diff] [blame] | 2426 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
| 2427 | return -EINVAL; |
| 2428 | |
Sanjay Lal | 2f4d9b5 | 2012-11-21 18:34:15 -0800 | [diff] [blame] | 2429 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS) |
Avi Kivity | 2122ff5 | 2010-05-13 11:25:04 +0300 | [diff] [blame] | 2430 | /* |
| 2431 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, |
| 2432 | * so vcpu_load() would break it. |
| 2433 | */ |
Jens Freimann | 47b43c5 | 2014-11-11 20:57:06 +0100 | [diff] [blame] | 2434 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT) |
Avi Kivity | 2122ff5 | 2010-05-13 11:25:04 +0300 | [diff] [blame] | 2435 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
| 2436 | #endif |
| 2437 | |
| 2438 | |
Michael S. Tsirkin | 9fc7744 | 2012-09-16 11:50:30 +0300 | [diff] [blame] | 2439 | r = vcpu_load(vcpu); |
| 2440 | if (r) |
| 2441 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2442 | switch (ioctl) { |
Avi Kivity | 9a2bb7f | 2007-02-22 12:58:31 +0200 | [diff] [blame] | 2443 | case KVM_RUN: |
Avi Kivity | f0fe510 | 2007-03-07 13:11:17 +0200 | [diff] [blame] | 2444 | r = -EINVAL; |
| 2445 | if (arg) |
| 2446 | goto out; |
Christian Borntraeger | 7a72f7a | 2014-08-05 16:44:14 +0200 | [diff] [blame] | 2447 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
| 2448 | /* The thread running this VCPU changed. */ |
| 2449 | struct pid *oldpid = vcpu->pid; |
| 2450 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 2451 | |
Christian Borntraeger | 7a72f7a | 2014-08-05 16:44:14 +0200 | [diff] [blame] | 2452 | rcu_assign_pointer(vcpu->pid, newpid); |
| 2453 | if (oldpid) |
| 2454 | synchronize_rcu(); |
| 2455 | put_pid(oldpid); |
| 2456 | } |
Hollis Blanchard | b6c7a5d | 2007-11-01 14:16:10 -0500 | [diff] [blame] | 2457 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
Gleb Natapov | 64be500 | 2010-10-24 16:49:08 +0200 | [diff] [blame] | 2458 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2459 | break; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2460 | case KVM_GET_REGS: { |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2461 | struct kvm_regs *kvm_regs; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2462 | |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2463 | r = -ENOMEM; |
| 2464 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); |
| 2465 | if (!kvm_regs) |
| 2466 | goto out; |
| 2467 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2468 | if (r) |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2469 | goto out_free1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2470 | r = -EFAULT; |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2471 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
| 2472 | goto out_free1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2473 | r = 0; |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2474 | out_free1: |
| 2475 | kfree(kvm_regs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2476 | break; |
| 2477 | } |
| 2478 | case KVM_SET_REGS: { |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2479 | struct kvm_regs *kvm_regs; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2480 | |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2481 | r = -ENOMEM; |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2482 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
| 2483 | if (IS_ERR(kvm_regs)) { |
| 2484 | r = PTR_ERR(kvm_regs); |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2485 | goto out; |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2486 | } |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2487 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
Xiantao Zhang | 3e4bb3a | 2008-02-25 18:52:20 +0800 | [diff] [blame] | 2488 | kfree(kvm_regs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2489 | break; |
| 2490 | } |
| 2491 | case KVM_GET_SREGS: { |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2492 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
| 2493 | r = -ENOMEM; |
| 2494 | if (!kvm_sregs) |
| 2495 | goto out; |
| 2496 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2497 | if (r) |
| 2498 | goto out; |
| 2499 | r = -EFAULT; |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2500 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2501 | goto out; |
| 2502 | r = 0; |
| 2503 | break; |
| 2504 | } |
| 2505 | case KVM_SET_SREGS: { |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2506 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
| 2507 | if (IS_ERR(kvm_sregs)) { |
| 2508 | r = PTR_ERR(kvm_sregs); |
Guo Chao | 1859541 | 2012-11-02 18:33:21 +0800 | [diff] [blame] | 2509 | kvm_sregs = NULL; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2510 | goto out; |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2511 | } |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2512 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2513 | break; |
| 2514 | } |
Marcelo Tosatti | 62d9f0d | 2008-04-11 13:24:45 -0300 | [diff] [blame] | 2515 | case KVM_GET_MP_STATE: { |
| 2516 | struct kvm_mp_state mp_state; |
| 2517 | |
| 2518 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); |
| 2519 | if (r) |
| 2520 | goto out; |
| 2521 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2522 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) |
Marcelo Tosatti | 62d9f0d | 2008-04-11 13:24:45 -0300 | [diff] [blame] | 2523 | goto out; |
| 2524 | r = 0; |
| 2525 | break; |
| 2526 | } |
| 2527 | case KVM_SET_MP_STATE: { |
| 2528 | struct kvm_mp_state mp_state; |
| 2529 | |
| 2530 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2531 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) |
Marcelo Tosatti | 62d9f0d | 2008-04-11 13:24:45 -0300 | [diff] [blame] | 2532 | goto out; |
| 2533 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); |
Marcelo Tosatti | 62d9f0d | 2008-04-11 13:24:45 -0300 | [diff] [blame] | 2534 | break; |
| 2535 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2536 | case KVM_TRANSLATE: { |
| 2537 | struct kvm_translation tr; |
| 2538 | |
| 2539 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2540 | if (copy_from_user(&tr, argp, sizeof(tr))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2541 | goto out; |
Zhang Xiantao | 8b00679 | 2007-11-16 13:05:55 +0800 | [diff] [blame] | 2542 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2543 | if (r) |
| 2544 | goto out; |
| 2545 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2546 | if (copy_to_user(argp, &tr, sizeof(tr))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2547 | goto out; |
| 2548 | r = 0; |
| 2549 | break; |
| 2550 | } |
Jan Kiszka | d0bfb94 | 2008-12-15 13:52:10 +0100 | [diff] [blame] | 2551 | case KVM_SET_GUEST_DEBUG: { |
| 2552 | struct kvm_guest_debug dbg; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2553 | |
| 2554 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2555 | if (copy_from_user(&dbg, argp, sizeof(dbg))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2556 | goto out; |
Jan Kiszka | d0bfb94 | 2008-12-15 13:52:10 +0100 | [diff] [blame] | 2557 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2558 | break; |
| 2559 | } |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2560 | case KVM_SET_SIGNAL_MASK: { |
| 2561 | struct kvm_signal_mask __user *sigmask_arg = argp; |
| 2562 | struct kvm_signal_mask kvm_sigmask; |
| 2563 | sigset_t sigset, *p; |
| 2564 | |
| 2565 | p = NULL; |
| 2566 | if (argp) { |
| 2567 | r = -EFAULT; |
| 2568 | if (copy_from_user(&kvm_sigmask, argp, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2569 | sizeof(kvm_sigmask))) |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2570 | goto out; |
| 2571 | r = -EINVAL; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2572 | if (kvm_sigmask.len != sizeof(sigset)) |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2573 | goto out; |
| 2574 | r = -EFAULT; |
| 2575 | if (copy_from_user(&sigset, sigmask_arg->sigset, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2576 | sizeof(sigset))) |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2577 | goto out; |
| 2578 | p = &sigset; |
| 2579 | } |
Andi Kleen | 376d41f | 2010-06-10 13:10:47 +0200 | [diff] [blame] | 2580 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
Avi Kivity | 1961d27 | 2007-03-05 19:46:05 +0200 | [diff] [blame] | 2581 | break; |
| 2582 | } |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2583 | case KVM_GET_FPU: { |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2584 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
| 2585 | r = -ENOMEM; |
| 2586 | if (!fpu) |
| 2587 | goto out; |
| 2588 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2589 | if (r) |
| 2590 | goto out; |
| 2591 | r = -EFAULT; |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2592 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2593 | goto out; |
| 2594 | r = 0; |
| 2595 | break; |
| 2596 | } |
| 2597 | case KVM_SET_FPU: { |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2598 | fpu = memdup_user(argp, sizeof(*fpu)); |
| 2599 | if (IS_ERR(fpu)) { |
| 2600 | r = PTR_ERR(fpu); |
Guo Chao | 1859541 | 2012-11-02 18:33:21 +0800 | [diff] [blame] | 2601 | fpu = NULL; |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2602 | goto out; |
Sasha Levin | ff5c2c0 | 2011-12-04 19:36:29 +0200 | [diff] [blame] | 2603 | } |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2604 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
Avi Kivity | b883673 | 2007-04-01 16:34:31 +0300 | [diff] [blame] | 2605 | break; |
| 2606 | } |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2607 | default: |
Carsten Otte | 313a3dc | 2007-10-11 19:16:52 +0200 | [diff] [blame] | 2608 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2609 | } |
| 2610 | out: |
Avi Kivity | 2122ff5 | 2010-05-13 11:25:04 +0300 | [diff] [blame] | 2611 | vcpu_put(vcpu); |
Dave Hansen | fa3795a | 2008-08-11 10:01:46 -0700 | [diff] [blame] | 2612 | kfree(fpu); |
| 2613 | kfree(kvm_sregs); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2614 | return r; |
| 2615 | } |
| 2616 | |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 2617 | #ifdef CONFIG_KVM_COMPAT |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2618 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
| 2619 | unsigned int ioctl, unsigned long arg) |
| 2620 | { |
| 2621 | struct kvm_vcpu *vcpu = filp->private_data; |
| 2622 | void __user *argp = compat_ptr(arg); |
| 2623 | int r; |
| 2624 | |
| 2625 | if (vcpu->kvm->mm != current->mm) |
| 2626 | return -EIO; |
| 2627 | |
| 2628 | switch (ioctl) { |
| 2629 | case KVM_SET_SIGNAL_MASK: { |
| 2630 | struct kvm_signal_mask __user *sigmask_arg = argp; |
| 2631 | struct kvm_signal_mask kvm_sigmask; |
| 2632 | compat_sigset_t csigset; |
| 2633 | sigset_t sigset; |
| 2634 | |
| 2635 | if (argp) { |
| 2636 | r = -EFAULT; |
| 2637 | if (copy_from_user(&kvm_sigmask, argp, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2638 | sizeof(kvm_sigmask))) |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2639 | goto out; |
| 2640 | r = -EINVAL; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2641 | if (kvm_sigmask.len != sizeof(csigset)) |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2642 | goto out; |
| 2643 | r = -EFAULT; |
| 2644 | if (copy_from_user(&csigset, sigmask_arg->sigset, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2645 | sizeof(csigset))) |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2646 | goto out; |
Alan Cox | 760a9a3 | 2012-08-22 14:34:11 +0100 | [diff] [blame] | 2647 | sigset_from_compat(&sigset, &csigset); |
| 2648 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
| 2649 | } else |
| 2650 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); |
Alexander Graf | 1dda606 | 2011-06-08 02:45:37 +0200 | [diff] [blame] | 2651 | break; |
| 2652 | } |
| 2653 | default: |
| 2654 | r = kvm_vcpu_ioctl(filp, ioctl, arg); |
| 2655 | } |
| 2656 | |
| 2657 | out: |
| 2658 | return r; |
| 2659 | } |
| 2660 | #endif |
| 2661 | |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2662 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
| 2663 | int (*accessor)(struct kvm_device *dev, |
| 2664 | struct kvm_device_attr *attr), |
| 2665 | unsigned long arg) |
| 2666 | { |
| 2667 | struct kvm_device_attr attr; |
| 2668 | |
| 2669 | if (!accessor) |
| 2670 | return -EPERM; |
| 2671 | |
| 2672 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) |
| 2673 | return -EFAULT; |
| 2674 | |
| 2675 | return accessor(dev, &attr); |
| 2676 | } |
| 2677 | |
| 2678 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, |
| 2679 | unsigned long arg) |
| 2680 | { |
| 2681 | struct kvm_device *dev = filp->private_data; |
| 2682 | |
| 2683 | switch (ioctl) { |
| 2684 | case KVM_SET_DEVICE_ATTR: |
| 2685 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); |
| 2686 | case KVM_GET_DEVICE_ATTR: |
| 2687 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); |
| 2688 | case KVM_HAS_DEVICE_ATTR: |
| 2689 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); |
| 2690 | default: |
| 2691 | if (dev->ops->ioctl) |
| 2692 | return dev->ops->ioctl(dev, ioctl, arg); |
| 2693 | |
| 2694 | return -ENOTTY; |
| 2695 | } |
| 2696 | } |
| 2697 | |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2698 | static int kvm_device_release(struct inode *inode, struct file *filp) |
| 2699 | { |
| 2700 | struct kvm_device *dev = filp->private_data; |
| 2701 | struct kvm *kvm = dev->kvm; |
| 2702 | |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2703 | kvm_put_kvm(kvm); |
| 2704 | return 0; |
| 2705 | } |
| 2706 | |
| 2707 | static const struct file_operations kvm_device_fops = { |
| 2708 | .unlocked_ioctl = kvm_device_ioctl, |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 2709 | #ifdef CONFIG_KVM_COMPAT |
Scott Wood | db6ae61 | 2013-04-30 20:00:45 -0500 | [diff] [blame] | 2710 | .compat_ioctl = kvm_device_ioctl, |
| 2711 | #endif |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2712 | .release = kvm_device_release, |
| 2713 | }; |
| 2714 | |
| 2715 | struct kvm_device *kvm_device_from_filp(struct file *filp) |
| 2716 | { |
| 2717 | if (filp->f_op != &kvm_device_fops) |
| 2718 | return NULL; |
| 2719 | |
| 2720 | return filp->private_data; |
| 2721 | } |
| 2722 | |
Will Deacon | d60eacb | 2014-09-02 10:27:33 +0100 | [diff] [blame] | 2723 | static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
| 2724 | #ifdef CONFIG_KVM_MPIC |
| 2725 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
| 2726 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, |
| 2727 | #endif |
| 2728 | |
| 2729 | #ifdef CONFIG_KVM_XICS |
| 2730 | [KVM_DEV_TYPE_XICS] = &kvm_xics_ops, |
| 2731 | #endif |
Will Deacon | d60eacb | 2014-09-02 10:27:33 +0100 | [diff] [blame] | 2732 | }; |
| 2733 | |
| 2734 | int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type) |
| 2735 | { |
| 2736 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) |
| 2737 | return -ENOSPC; |
| 2738 | |
| 2739 | if (kvm_device_ops_table[type] != NULL) |
| 2740 | return -EEXIST; |
| 2741 | |
| 2742 | kvm_device_ops_table[type] = ops; |
| 2743 | return 0; |
| 2744 | } |
| 2745 | |
Wanpeng Li | 571ee1b | 2014-10-09 18:30:08 +0800 | [diff] [blame] | 2746 | void kvm_unregister_device_ops(u32 type) |
| 2747 | { |
| 2748 | if (kvm_device_ops_table[type] != NULL) |
| 2749 | kvm_device_ops_table[type] = NULL; |
| 2750 | } |
| 2751 | |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2752 | static int kvm_ioctl_create_device(struct kvm *kvm, |
| 2753 | struct kvm_create_device *cd) |
| 2754 | { |
| 2755 | struct kvm_device_ops *ops = NULL; |
| 2756 | struct kvm_device *dev; |
| 2757 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; |
| 2758 | int ret; |
| 2759 | |
Will Deacon | d60eacb | 2014-09-02 10:27:33 +0100 | [diff] [blame] | 2760 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2761 | return -ENODEV; |
Will Deacon | d60eacb | 2014-09-02 10:27:33 +0100 | [diff] [blame] | 2762 | |
| 2763 | ops = kvm_device_ops_table[cd->type]; |
| 2764 | if (ops == NULL) |
| 2765 | return -ENODEV; |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2766 | |
| 2767 | if (test) |
| 2768 | return 0; |
| 2769 | |
| 2770 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 2771 | if (!dev) |
| 2772 | return -ENOMEM; |
| 2773 | |
| 2774 | dev->ops = ops; |
| 2775 | dev->kvm = kvm; |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2776 | |
| 2777 | ret = ops->create(dev, cd->type); |
| 2778 | if (ret < 0) { |
| 2779 | kfree(dev); |
| 2780 | return ret; |
| 2781 | } |
| 2782 | |
Yann Droneaud | 24009b0 | 2013-08-24 22:14:07 +0200 | [diff] [blame] | 2783 | 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] | 2784 | if (ret < 0) { |
| 2785 | ops->destroy(dev); |
| 2786 | return ret; |
| 2787 | } |
| 2788 | |
Scott Wood | 07f0a7b | 2013-04-25 14:11:23 +0000 | [diff] [blame] | 2789 | list_add(&dev->vm_node, &kvm->devices); |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2790 | kvm_get_kvm(kvm); |
| 2791 | cd->fd = ret; |
| 2792 | return 0; |
| 2793 | } |
| 2794 | |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2795 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
| 2796 | { |
| 2797 | switch (arg) { |
| 2798 | case KVM_CAP_USER_MEMORY: |
| 2799 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
| 2800 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2801 | case KVM_CAP_INTERNAL_ERROR_DATA: |
| 2802 | #ifdef CONFIG_HAVE_KVM_MSI |
| 2803 | case KVM_CAP_SIGNAL_MSI: |
| 2804 | #endif |
Paul Mackerras | 297e210 | 2014-06-30 20:51:13 +1000 | [diff] [blame] | 2805 | #ifdef CONFIG_HAVE_KVM_IRQFD |
Paolo Bonzini | dc9be0f | 2015-03-05 11:54:46 +0100 | [diff] [blame] | 2806 | case KVM_CAP_IRQFD: |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2807 | case KVM_CAP_IRQFD_RESAMPLE: |
| 2808 | #endif |
Jason Wang | e9ea506 | 2015-09-15 14:41:59 +0800 | [diff] [blame] | 2809 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2810 | case KVM_CAP_CHECK_EXTENSION_VM: |
| 2811 | return 1; |
| 2812 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
| 2813 | case KVM_CAP_IRQ_ROUTING: |
| 2814 | return KVM_MAX_IRQ_ROUTES; |
| 2815 | #endif |
Paolo Bonzini | f481b06 | 2015-05-17 17:30:37 +0200 | [diff] [blame] | 2816 | #if KVM_ADDRESS_SPACE_NUM > 1 |
| 2817 | case KVM_CAP_MULTI_ADDRESS_SPACE: |
| 2818 | return KVM_ADDRESS_SPACE_NUM; |
| 2819 | #endif |
Greg Kurz | 0b1b1df | 2016-05-09 18:13:37 +0200 | [diff] [blame] | 2820 | case KVM_CAP_MAX_VCPU_ID: |
| 2821 | return KVM_MAX_VCPU_ID; |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2822 | default: |
| 2823 | break; |
| 2824 | } |
| 2825 | return kvm_vm_ioctl_check_extension(kvm, arg); |
| 2826 | } |
| 2827 | |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2828 | static long kvm_vm_ioctl(struct file *filp, |
| 2829 | unsigned int ioctl, unsigned long arg) |
| 2830 | { |
| 2831 | struct kvm *kvm = filp->private_data; |
| 2832 | void __user *argp = (void __user *)arg; |
Carsten Otte | 1fe779f | 2007-10-29 16:08:35 +0100 | [diff] [blame] | 2833 | int r; |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2834 | |
Avi Kivity | 6d4e4c4 | 2007-11-21 16:41:05 +0200 | [diff] [blame] | 2835 | if (kvm->mm != current->mm) |
| 2836 | return -EIO; |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2837 | switch (ioctl) { |
| 2838 | case KVM_CREATE_VCPU: |
| 2839 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); |
Avi Kivity | bccf215 | 2007-02-21 18:04:26 +0200 | [diff] [blame] | 2840 | break; |
Izik Eidus | 6fc138d | 2007-10-09 19:20:39 +0200 | [diff] [blame] | 2841 | case KVM_SET_USER_MEMORY_REGION: { |
| 2842 | struct kvm_userspace_memory_region kvm_userspace_mem; |
| 2843 | |
| 2844 | r = -EFAULT; |
| 2845 | if (copy_from_user(&kvm_userspace_mem, argp, |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2846 | sizeof(kvm_userspace_mem))) |
Izik Eidus | 6fc138d | 2007-10-09 19:20:39 +0200 | [diff] [blame] | 2847 | goto out; |
| 2848 | |
Takuya Yoshikawa | 47ae31e | 2013-02-27 19:43:00 +0900 | [diff] [blame] | 2849 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2850 | break; |
| 2851 | } |
| 2852 | case KVM_GET_DIRTY_LOG: { |
| 2853 | struct kvm_dirty_log log; |
| 2854 | |
| 2855 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2856 | if (copy_from_user(&log, argp, sizeof(log))) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2857 | goto out; |
Avi Kivity | 2c6f5df | 2007-02-20 18:27:58 +0200 | [diff] [blame] | 2858 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2859 | break; |
| 2860 | } |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2861 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 2862 | case KVM_REGISTER_COALESCED_MMIO: { |
| 2863 | struct kvm_coalesced_mmio_zone zone; |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 2864 | |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2865 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2866 | if (copy_from_user(&zone, argp, sizeof(zone))) |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2867 | goto out; |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2868 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2869 | break; |
| 2870 | } |
| 2871 | case KVM_UNREGISTER_COALESCED_MMIO: { |
| 2872 | struct kvm_coalesced_mmio_zone zone; |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 2873 | |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2874 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2875 | if (copy_from_user(&zone, argp, sizeof(zone))) |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2876 | goto out; |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2877 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 2878 | break; |
| 2879 | } |
| 2880 | #endif |
Gregory Haskins | 721eecb | 2009-05-20 10:30:49 -0400 | [diff] [blame] | 2881 | case KVM_IRQFD: { |
| 2882 | struct kvm_irqfd data; |
| 2883 | |
| 2884 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2885 | if (copy_from_user(&data, argp, sizeof(data))) |
Gregory Haskins | 721eecb | 2009-05-20 10:30:49 -0400 | [diff] [blame] | 2886 | goto out; |
Alex Williamson | d4db293 | 2012-06-29 09:56:08 -0600 | [diff] [blame] | 2887 | r = kvm_irqfd(kvm, &data); |
Gregory Haskins | 721eecb | 2009-05-20 10:30:49 -0400 | [diff] [blame] | 2888 | break; |
| 2889 | } |
Gregory Haskins | d34e6b1 | 2009-07-07 17:08:49 -0400 | [diff] [blame] | 2890 | case KVM_IOEVENTFD: { |
| 2891 | struct kvm_ioeventfd data; |
| 2892 | |
| 2893 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2894 | if (copy_from_user(&data, argp, sizeof(data))) |
Gregory Haskins | d34e6b1 | 2009-07-07 17:08:49 -0400 | [diff] [blame] | 2895 | goto out; |
| 2896 | r = kvm_ioeventfd(kvm, &data); |
| 2897 | break; |
| 2898 | } |
Jan Kiszka | 07975ad | 2012-03-29 21:14:12 +0200 | [diff] [blame] | 2899 | #ifdef CONFIG_HAVE_KVM_MSI |
| 2900 | case KVM_SIGNAL_MSI: { |
| 2901 | struct kvm_msi msi; |
| 2902 | |
| 2903 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2904 | if (copy_from_user(&msi, argp, sizeof(msi))) |
Jan Kiszka | 07975ad | 2012-03-29 21:14:12 +0200 | [diff] [blame] | 2905 | goto out; |
| 2906 | r = kvm_send_userspace_msi(kvm, &msi); |
| 2907 | break; |
| 2908 | } |
| 2909 | #endif |
Christoffer Dall | 23d43cf | 2012-07-24 08:51:20 -0400 | [diff] [blame] | 2910 | #ifdef __KVM_HAVE_IRQ_LINE |
| 2911 | case KVM_IRQ_LINE_STATUS: |
| 2912 | case KVM_IRQ_LINE: { |
| 2913 | struct kvm_irq_level irq_event; |
| 2914 | |
| 2915 | r = -EFAULT; |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2916 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) |
Christoffer Dall | 23d43cf | 2012-07-24 08:51:20 -0400 | [diff] [blame] | 2917 | goto out; |
| 2918 | |
Yang Zhang | aa2fbe6 | 2013-04-11 19:21:40 +0800 | [diff] [blame] | 2919 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
| 2920 | ioctl == KVM_IRQ_LINE_STATUS); |
Christoffer Dall | 23d43cf | 2012-07-24 08:51:20 -0400 | [diff] [blame] | 2921 | if (r) |
| 2922 | goto out; |
| 2923 | |
| 2924 | r = -EFAULT; |
| 2925 | if (ioctl == KVM_IRQ_LINE_STATUS) { |
Xiubo Li | 893bdbf | 2015-02-26 14:58:19 +0800 | [diff] [blame] | 2926 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) |
Christoffer Dall | 23d43cf | 2012-07-24 08:51:20 -0400 | [diff] [blame] | 2927 | goto out; |
| 2928 | } |
| 2929 | |
| 2930 | r = 0; |
| 2931 | break; |
| 2932 | } |
| 2933 | #endif |
Alexander Graf | aa8d594 | 2013-04-15 21:12:53 +0200 | [diff] [blame] | 2934 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
| 2935 | case KVM_SET_GSI_ROUTING: { |
| 2936 | struct kvm_irq_routing routing; |
| 2937 | struct kvm_irq_routing __user *urouting; |
| 2938 | struct kvm_irq_routing_entry *entries; |
| 2939 | |
| 2940 | r = -EFAULT; |
| 2941 | if (copy_from_user(&routing, argp, sizeof(routing))) |
| 2942 | goto out; |
| 2943 | r = -EINVAL; |
| 2944 | if (routing.nr >= KVM_MAX_IRQ_ROUTES) |
| 2945 | goto out; |
| 2946 | if (routing.flags) |
| 2947 | goto out; |
| 2948 | r = -ENOMEM; |
| 2949 | entries = vmalloc(routing.nr * sizeof(*entries)); |
| 2950 | if (!entries) |
| 2951 | goto out; |
| 2952 | r = -EFAULT; |
| 2953 | urouting = argp; |
| 2954 | if (copy_from_user(entries, urouting->entries, |
| 2955 | routing.nr * sizeof(*entries))) |
| 2956 | goto out_free_irq_routing; |
| 2957 | r = kvm_set_irq_routing(kvm, entries, routing.nr, |
| 2958 | routing.flags); |
Xiubo Li | a642a17 | 2015-02-26 14:58:20 +0800 | [diff] [blame] | 2959 | out_free_irq_routing: |
Alexander Graf | aa8d594 | 2013-04-15 21:12:53 +0200 | [diff] [blame] | 2960 | vfree(entries); |
| 2961 | break; |
| 2962 | } |
| 2963 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ |
Scott Wood | 852b6d5 | 2013-04-12 14:08:42 +0000 | [diff] [blame] | 2964 | case KVM_CREATE_DEVICE: { |
| 2965 | struct kvm_create_device cd; |
| 2966 | |
| 2967 | r = -EFAULT; |
| 2968 | if (copy_from_user(&cd, argp, sizeof(cd))) |
| 2969 | goto out; |
| 2970 | |
| 2971 | r = kvm_ioctl_create_device(kvm, &cd); |
| 2972 | if (r) |
| 2973 | goto out; |
| 2974 | |
| 2975 | r = -EFAULT; |
| 2976 | if (copy_to_user(argp, &cd, sizeof(cd))) |
| 2977 | goto out; |
| 2978 | |
| 2979 | r = 0; |
| 2980 | break; |
| 2981 | } |
Alexander Graf | 92b591a | 2014-07-14 18:33:08 +0200 | [diff] [blame] | 2982 | case KVM_CHECK_EXTENSION: |
| 2983 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); |
| 2984 | break; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 2985 | default: |
Carsten Otte | 1fe779f | 2007-10-29 16:08:35 +0100 | [diff] [blame] | 2986 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 2987 | } |
| 2988 | out: |
| 2989 | return r; |
| 2990 | } |
| 2991 | |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 2992 | #ifdef CONFIG_KVM_COMPAT |
Arnd Bergmann | 6ff5894 | 2009-10-22 14:19:27 +0200 | [diff] [blame] | 2993 | struct compat_kvm_dirty_log { |
| 2994 | __u32 slot; |
| 2995 | __u32 padding1; |
| 2996 | union { |
| 2997 | compat_uptr_t dirty_bitmap; /* one bit per page */ |
| 2998 | __u64 padding2; |
| 2999 | }; |
| 3000 | }; |
| 3001 | |
| 3002 | static long kvm_vm_compat_ioctl(struct file *filp, |
| 3003 | unsigned int ioctl, unsigned long arg) |
| 3004 | { |
| 3005 | struct kvm *kvm = filp->private_data; |
| 3006 | int r; |
| 3007 | |
| 3008 | if (kvm->mm != current->mm) |
| 3009 | return -EIO; |
| 3010 | switch (ioctl) { |
| 3011 | case KVM_GET_DIRTY_LOG: { |
| 3012 | struct compat_kvm_dirty_log compat_log; |
| 3013 | struct kvm_dirty_log log; |
| 3014 | |
| 3015 | r = -EFAULT; |
| 3016 | if (copy_from_user(&compat_log, (void __user *)arg, |
| 3017 | sizeof(compat_log))) |
| 3018 | goto out; |
| 3019 | log.slot = compat_log.slot; |
| 3020 | log.padding1 = compat_log.padding1; |
| 3021 | log.padding2 = compat_log.padding2; |
| 3022 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); |
| 3023 | |
| 3024 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
Arnd Bergmann | 6ff5894 | 2009-10-22 14:19:27 +0200 | [diff] [blame] | 3025 | break; |
| 3026 | } |
| 3027 | default: |
| 3028 | r = kvm_vm_ioctl(filp, ioctl, arg); |
| 3029 | } |
| 3030 | |
| 3031 | out: |
| 3032 | return r; |
| 3033 | } |
| 3034 | #endif |
| 3035 | |
Christian Borntraeger | 3d3aab1 | 2008-12-02 11:17:32 +0100 | [diff] [blame] | 3036 | static struct file_operations kvm_vm_fops = { |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3037 | .release = kvm_vm_release, |
| 3038 | .unlocked_ioctl = kvm_vm_ioctl, |
Christian Borntraeger | de8e5d7 | 2015-02-03 09:35:15 +0100 | [diff] [blame] | 3039 | #ifdef CONFIG_KVM_COMPAT |
Arnd Bergmann | 6ff5894 | 2009-10-22 14:19:27 +0200 | [diff] [blame] | 3040 | .compat_ioctl = kvm_vm_compat_ioctl, |
| 3041 | #endif |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3042 | .llseek = noop_llseek, |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3043 | }; |
| 3044 | |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 3045 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3046 | { |
Heiko Carstens | aac8763 | 2010-10-27 17:22:10 +0200 | [diff] [blame] | 3047 | int r; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3048 | struct kvm *kvm; |
| 3049 | |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 3050 | kvm = kvm_create_vm(type); |
Avi Kivity | d6d2816 | 2007-06-28 08:38:16 -0400 | [diff] [blame] | 3051 | if (IS_ERR(kvm)) |
| 3052 | return PTR_ERR(kvm); |
Takuya Yoshikawa | 6ce5a09 | 2010-03-15 22:13:30 +0900 | [diff] [blame] | 3053 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 3054 | r = kvm_coalesced_mmio_init(kvm); |
| 3055 | if (r < 0) { |
| 3056 | kvm_put_kvm(kvm); |
| 3057 | return r; |
| 3058 | } |
| 3059 | #endif |
Yann Droneaud | 24009b0 | 2013-08-24 22:14:07 +0200 | [diff] [blame] | 3060 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC); |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3061 | if (r < 0) { |
Al Viro | 66c0b39 | 2008-04-19 20:33:56 +0100 | [diff] [blame] | 3062 | kvm_put_kvm(kvm); |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3063 | return r; |
| 3064 | } |
| 3065 | |
| 3066 | if (kvm_create_vm_debugfs(kvm, r) < 0) { |
| 3067 | kvm_put_kvm(kvm); |
| 3068 | return -ENOMEM; |
| 3069 | } |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3070 | |
Heiko Carstens | aac8763 | 2010-10-27 17:22:10 +0200 | [diff] [blame] | 3071 | return r; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3072 | } |
| 3073 | |
| 3074 | static long kvm_dev_ioctl(struct file *filp, |
| 3075 | unsigned int ioctl, unsigned long arg) |
| 3076 | { |
Avi Kivity | 07c45a3 | 2007-03-07 13:05:38 +0200 | [diff] [blame] | 3077 | long r = -EINVAL; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3078 | |
| 3079 | switch (ioctl) { |
| 3080 | case KVM_GET_API_VERSION: |
Avi Kivity | f0fe510 | 2007-03-07 13:11:17 +0200 | [diff] [blame] | 3081 | if (arg) |
| 3082 | goto out; |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3083 | r = KVM_API_VERSION; |
| 3084 | break; |
| 3085 | case KVM_CREATE_VM: |
Carsten Otte | e08b963 | 2012-01-04 10:25:20 +0100 | [diff] [blame] | 3086 | r = kvm_dev_ioctl_create_vm(arg); |
Avi Kivity | f17abe9 | 2007-02-21 19:28:04 +0200 | [diff] [blame] | 3087 | break; |
Zhang Xiantao | 018d00d | 2007-11-15 23:07:47 +0800 | [diff] [blame] | 3088 | case KVM_CHECK_EXTENSION: |
Alexander Graf | 784aa3d | 2014-07-14 18:27:35 +0200 | [diff] [blame] | 3089 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
Avi Kivity | 5d308f4 | 2007-03-01 17:56:20 +0200 | [diff] [blame] | 3090 | break; |
Avi Kivity | 07c45a3 | 2007-03-07 13:05:38 +0200 | [diff] [blame] | 3091 | case KVM_GET_VCPU_MMAP_SIZE: |
Avi Kivity | 07c45a3 | 2007-03-07 13:05:38 +0200 | [diff] [blame] | 3092 | if (arg) |
| 3093 | goto out; |
Avi Kivity | adb1ff4 | 2008-01-24 15:13:08 +0200 | [diff] [blame] | 3094 | r = PAGE_SIZE; /* struct kvm_run */ |
| 3095 | #ifdef CONFIG_X86 |
| 3096 | r += PAGE_SIZE; /* pio data page */ |
| 3097 | #endif |
Laurent Vivier | 5f94c17 | 2008-05-30 16:05:54 +0200 | [diff] [blame] | 3098 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 3099 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
| 3100 | #endif |
Avi Kivity | 07c45a3 | 2007-03-07 13:05:38 +0200 | [diff] [blame] | 3101 | break; |
Feng(Eric) Liu | d4c9ff2 | 2008-04-10 08:47:53 -0400 | [diff] [blame] | 3102 | case KVM_TRACE_ENABLE: |
| 3103 | case KVM_TRACE_PAUSE: |
| 3104 | case KVM_TRACE_DISABLE: |
Marcelo Tosatti | 2023a29 | 2009-06-18 11:47:28 -0300 | [diff] [blame] | 3105 | r = -EOPNOTSUPP; |
Feng(Eric) Liu | d4c9ff2 | 2008-04-10 08:47:53 -0400 | [diff] [blame] | 3106 | break; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3107 | default: |
Carsten Otte | 043405e | 2007-10-10 17:16:19 +0200 | [diff] [blame] | 3108 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3109 | } |
| 3110 | out: |
| 3111 | return r; |
| 3112 | } |
| 3113 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3114 | static struct file_operations kvm_chardev_ops = { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3115 | .unlocked_ioctl = kvm_dev_ioctl, |
| 3116 | .compat_ioctl = kvm_dev_ioctl, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3117 | .llseek = noop_llseek, |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3118 | }; |
| 3119 | |
| 3120 | static struct miscdevice kvm_dev = { |
Avi Kivity | bbe4432 | 2007-03-04 13:27:36 +0200 | [diff] [blame] | 3121 | KVM_MINOR, |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3122 | "kvm", |
| 3123 | &kvm_chardev_ops, |
| 3124 | }; |
| 3125 | |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3126 | static void hardware_enable_nolock(void *junk) |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3127 | { |
| 3128 | int cpu = raw_smp_processor_id(); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3129 | int r; |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3130 | |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3131 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3132 | return; |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3133 | |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3134 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3135 | |
Radim Krčmář | 13a34e0 | 2014-08-28 15:13:03 +0200 | [diff] [blame] | 3136 | r = kvm_arch_hardware_enable(); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3137 | |
| 3138 | if (r) { |
| 3139 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
| 3140 | atomic_inc(&hardware_enable_failed); |
Xiubo Li | 1170adc | 2015-02-26 14:58:26 +0800 | [diff] [blame] | 3141 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3142 | } |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3143 | } |
| 3144 | |
Paolo Bonzini | 4fa92fb | 2013-09-10 12:57:17 +0200 | [diff] [blame] | 3145 | static void hardware_enable(void) |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3146 | { |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3147 | raw_spin_lock(&kvm_count_lock); |
Paolo Bonzini | 4fa92fb | 2013-09-10 12:57:17 +0200 | [diff] [blame] | 3148 | if (kvm_usage_count) |
| 3149 | hardware_enable_nolock(NULL); |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3150 | raw_spin_unlock(&kvm_count_lock); |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3151 | } |
| 3152 | |
| 3153 | static void hardware_disable_nolock(void *junk) |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3154 | { |
| 3155 | int cpu = raw_smp_processor_id(); |
| 3156 | |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3157 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3158 | return; |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3159 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
Radim Krčmář | 13a34e0 | 2014-08-28 15:13:03 +0200 | [diff] [blame] | 3160 | kvm_arch_hardware_disable(); |
Avi Kivity | 1b6c016 | 2007-05-24 13:03:52 +0300 | [diff] [blame] | 3161 | } |
| 3162 | |
Paolo Bonzini | 4fa92fb | 2013-09-10 12:57:17 +0200 | [diff] [blame] | 3163 | static void hardware_disable(void) |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3164 | { |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3165 | raw_spin_lock(&kvm_count_lock); |
Paolo Bonzini | 4fa92fb | 2013-09-10 12:57:17 +0200 | [diff] [blame] | 3166 | if (kvm_usage_count) |
| 3167 | hardware_disable_nolock(NULL); |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3168 | raw_spin_unlock(&kvm_count_lock); |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3169 | } |
| 3170 | |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3171 | static void hardware_disable_all_nolock(void) |
| 3172 | { |
| 3173 | BUG_ON(!kvm_usage_count); |
| 3174 | |
| 3175 | kvm_usage_count--; |
| 3176 | if (!kvm_usage_count) |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3177 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3178 | } |
| 3179 | |
| 3180 | static void hardware_disable_all(void) |
| 3181 | { |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3182 | raw_spin_lock(&kvm_count_lock); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3183 | hardware_disable_all_nolock(); |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3184 | raw_spin_unlock(&kvm_count_lock); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3185 | } |
| 3186 | |
| 3187 | static int hardware_enable_all(void) |
| 3188 | { |
| 3189 | int r = 0; |
| 3190 | |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3191 | raw_spin_lock(&kvm_count_lock); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3192 | |
| 3193 | kvm_usage_count++; |
| 3194 | if (kvm_usage_count == 1) { |
| 3195 | atomic_set(&hardware_enable_failed, 0); |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3196 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3197 | |
| 3198 | if (atomic_read(&hardware_enable_failed)) { |
| 3199 | hardware_disable_all_nolock(); |
| 3200 | r = -EBUSY; |
| 3201 | } |
| 3202 | } |
| 3203 | |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3204 | raw_spin_unlock(&kvm_count_lock); |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3205 | |
| 3206 | return r; |
| 3207 | } |
| 3208 | |
Avi Kivity | 774c47f | 2007-02-12 00:54:47 -0800 | [diff] [blame] | 3209 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
| 3210 | void *v) |
| 3211 | { |
Avi Kivity | 1a6f4d7 | 2007-11-11 18:37:32 +0200 | [diff] [blame] | 3212 | val &= ~CPU_TASKS_FROZEN; |
Avi Kivity | 774c47f | 2007-02-12 00:54:47 -0800 | [diff] [blame] | 3213 | switch (val) { |
Avi Kivity | cec9ad2 | 2007-05-24 13:11:41 +0300 | [diff] [blame] | 3214 | case CPU_DYING: |
Paolo Bonzini | 4fa92fb | 2013-09-10 12:57:17 +0200 | [diff] [blame] | 3215 | hardware_disable(); |
Avi Kivity | 6ec8a856 | 2007-08-19 15:57:26 +0300 | [diff] [blame] | 3216 | break; |
Zachary Amsden | da908f2 | 2010-08-19 22:07:27 -1000 | [diff] [blame] | 3217 | case CPU_STARTING: |
Paolo Bonzini | 4fa92fb | 2013-09-10 12:57:17 +0200 | [diff] [blame] | 3218 | hardware_enable(); |
Avi Kivity | 774c47f | 2007-02-12 00:54:47 -0800 | [diff] [blame] | 3219 | break; |
| 3220 | } |
| 3221 | return NOTIFY_OK; |
| 3222 | } |
| 3223 | |
Rusty Russell | 9a2b85c | 2007-07-17 23:17:55 +1000 | [diff] [blame] | 3224 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
Mike Day | d77c26f | 2007-10-08 09:02:08 -0400 | [diff] [blame] | 3225 | void *v) |
Rusty Russell | 9a2b85c | 2007-07-17 23:17:55 +1000 | [diff] [blame] | 3226 | { |
Sheng Yang | 8e1c181 | 2009-04-29 11:09:04 +0800 | [diff] [blame] | 3227 | /* |
| 3228 | * Some (well, at least mine) BIOSes hang on reboot if |
| 3229 | * in vmx root mode. |
| 3230 | * |
| 3231 | * And Intel TXT required VMX off for all cpu when system shutdown. |
| 3232 | */ |
Xiubo Li | 1170adc | 2015-02-26 14:58:26 +0800 | [diff] [blame] | 3233 | pr_info("kvm: exiting hardware virtualization\n"); |
Sheng Yang | 8e1c181 | 2009-04-29 11:09:04 +0800 | [diff] [blame] | 3234 | kvm_rebooting = true; |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3235 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
Rusty Russell | 9a2b85c | 2007-07-17 23:17:55 +1000 | [diff] [blame] | 3236 | return NOTIFY_OK; |
| 3237 | } |
| 3238 | |
| 3239 | static struct notifier_block kvm_reboot_notifier = { |
| 3240 | .notifier_call = kvm_reboot, |
| 3241 | .priority = 0, |
| 3242 | }; |
| 3243 | |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3244 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3245 | { |
| 3246 | int i; |
| 3247 | |
| 3248 | for (i = 0; i < bus->dev_count; i++) { |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3249 | struct kvm_io_device *pos = bus->range[i].dev; |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3250 | |
| 3251 | kvm_iodevice_destructor(pos); |
| 3252 | } |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3253 | kfree(bus); |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3254 | } |
| 3255 | |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3256 | 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] | 3257 | const struct kvm_io_range *r2) |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3258 | { |
Jason Wang | 8f4216c7 | 2015-09-15 14:41:57 +0800 | [diff] [blame] | 3259 | gpa_t addr1 = r1->addr; |
| 3260 | gpa_t addr2 = r2->addr; |
| 3261 | |
| 3262 | if (addr1 < addr2) |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3263 | return -1; |
Jason Wang | 8f4216c7 | 2015-09-15 14:41:57 +0800 | [diff] [blame] | 3264 | |
| 3265 | /* If r2->len == 0, match the exact address. If r2->len != 0, |
| 3266 | * accept any overlapping write. Any order is acceptable for |
| 3267 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures |
| 3268 | * we process all of them. |
| 3269 | */ |
| 3270 | if (r2->len) { |
| 3271 | addr1 += r1->len; |
| 3272 | addr2 += r2->len; |
| 3273 | } |
| 3274 | |
| 3275 | if (addr1 > addr2) |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3276 | return 1; |
Jason Wang | 8f4216c7 | 2015-09-15 14:41:57 +0800 | [diff] [blame] | 3277 | |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3278 | return 0; |
| 3279 | } |
| 3280 | |
Paolo Bonzini | a343c9b | 2013-07-16 13:03:29 +0200 | [diff] [blame] | 3281 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
| 3282 | { |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3283 | return kvm_io_bus_cmp(p1, p2); |
Paolo Bonzini | a343c9b | 2013-07-16 13:03:29 +0200 | [diff] [blame] | 3284 | } |
| 3285 | |
Geoff Levand | 39369f7 | 2013-04-05 19:20:30 +0000 | [diff] [blame] | 3286 | 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] | 3287 | gpa_t addr, int len) |
| 3288 | { |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3289 | bus->range[bus->dev_count++] = (struct kvm_io_range) { |
| 3290 | .addr = addr, |
| 3291 | .len = len, |
| 3292 | .dev = dev, |
| 3293 | }; |
| 3294 | |
| 3295 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), |
| 3296 | kvm_io_bus_sort_cmp, NULL); |
| 3297 | |
| 3298 | return 0; |
| 3299 | } |
| 3300 | |
Geoff Levand | 39369f7 | 2013-04-05 19:20:30 +0000 | [diff] [blame] | 3301 | 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] | 3302 | gpa_t addr, int len) |
| 3303 | { |
| 3304 | struct kvm_io_range *range, key; |
| 3305 | int off; |
| 3306 | |
| 3307 | key = (struct kvm_io_range) { |
| 3308 | .addr = addr, |
| 3309 | .len = len, |
| 3310 | }; |
| 3311 | |
| 3312 | range = bsearch(&key, bus->range, bus->dev_count, |
| 3313 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); |
| 3314 | if (range == NULL) |
| 3315 | return -ENOENT; |
| 3316 | |
| 3317 | off = range - bus->range; |
| 3318 | |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3319 | 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] | 3320 | off--; |
| 3321 | |
| 3322 | return off; |
| 3323 | } |
| 3324 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3325 | 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] | 3326 | struct kvm_io_range *range, const void *val) |
| 3327 | { |
| 3328 | int idx; |
| 3329 | |
| 3330 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); |
| 3331 | if (idx < 0) |
| 3332 | return -EOPNOTSUPP; |
| 3333 | |
| 3334 | while (idx < bus->dev_count && |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3335 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3336 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3337 | range->len, val)) |
| 3338 | return idx; |
| 3339 | idx++; |
| 3340 | } |
| 3341 | |
| 3342 | return -EOPNOTSUPP; |
| 3343 | } |
| 3344 | |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 3345 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3346 | 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] | 3347 | int len, const void *val) |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3348 | { |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3349 | struct kvm_io_bus *bus; |
| 3350 | struct kvm_io_range range; |
| 3351 | int r; |
| 3352 | |
| 3353 | range = (struct kvm_io_range) { |
| 3354 | .addr = addr, |
| 3355 | .len = len, |
| 3356 | }; |
| 3357 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3358 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
| 3359 | r = __kvm_io_bus_write(vcpu, bus, &range, val); |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3360 | return r < 0 ? r : 0; |
| 3361 | } |
| 3362 | |
| 3363 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3364 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, |
| 3365 | gpa_t addr, int len, const void *val, long cookie) |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3366 | { |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 3367 | struct kvm_io_bus *bus; |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3368 | struct kvm_io_range range; |
| 3369 | |
| 3370 | range = (struct kvm_io_range) { |
| 3371 | .addr = addr, |
| 3372 | .len = len, |
| 3373 | }; |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 3374 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3375 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3376 | |
| 3377 | /* First try the device referenced by cookie. */ |
| 3378 | if ((cookie >= 0) && (cookie < bus->dev_count) && |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3379 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3380 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3381 | val)) |
| 3382 | return cookie; |
| 3383 | |
| 3384 | /* |
| 3385 | * cookie contained garbage; fall back to search and return the |
| 3386 | * correct cookie value. |
| 3387 | */ |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3388 | return __kvm_io_bus_write(vcpu, bus, &range, val); |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3389 | } |
| 3390 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3391 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
| 3392 | struct kvm_io_range *range, void *val) |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3393 | { |
| 3394 | int idx; |
| 3395 | |
| 3396 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3397 | if (idx < 0) |
| 3398 | return -EOPNOTSUPP; |
| 3399 | |
| 3400 | while (idx < bus->dev_count && |
Paolo Bonzini | c21fbff | 2013-08-27 15:41:41 +0200 | [diff] [blame] | 3401 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3402 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3403 | range->len, val)) |
| 3404 | return idx; |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3405 | idx++; |
| 3406 | } |
| 3407 | |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 3408 | return -EOPNOTSUPP; |
| 3409 | } |
Michael S. Tsirkin | 68c3b4d | 2014-03-31 21:50:44 +0300 | [diff] [blame] | 3410 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3411 | |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 3412 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3413 | 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] | 3414 | int len, void *val) |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 3415 | { |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3416 | struct kvm_io_bus *bus; |
| 3417 | struct kvm_io_range range; |
| 3418 | int r; |
| 3419 | |
| 3420 | range = (struct kvm_io_range) { |
| 3421 | .addr = addr, |
| 3422 | .len = len, |
| 3423 | }; |
| 3424 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 3425 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
| 3426 | r = __kvm_io_bus_read(vcpu, bus, &range, val); |
Cornelia Huck | 126a5af | 2013-07-03 16:30:53 +0200 | [diff] [blame] | 3427 | return r < 0 ? r : 0; |
| 3428 | } |
| 3429 | |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3430 | |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 3431 | /* Caller must hold slots_lock. */ |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3432 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
| 3433 | int len, struct kvm_io_device *dev) |
Michael S. Tsirkin | 6c47469 | 2009-06-29 22:24:26 +0300 | [diff] [blame] | 3434 | { |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3435 | struct kvm_io_bus *new_bus, *bus; |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3436 | |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3437 | bus = kvm->buses[bus_idx]; |
Amos Kong | 6ea34c9 | 2013-05-25 06:44:15 +0800 | [diff] [blame] | 3438 | /* exclude ioeventfd which is limited by maximum fd */ |
| 3439 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3440 | return -ENOSPC; |
| 3441 | |
Jason Wang | d3febdd | 2015-08-25 17:05:46 +0800 | [diff] [blame] | 3442 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) * |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3443 | sizeof(struct kvm_io_range)), GFP_KERNEL); |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3444 | if (!new_bus) |
| 3445 | return -ENOMEM; |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3446 | memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * |
| 3447 | sizeof(struct kvm_io_range))); |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 3448 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3449 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
| 3450 | synchronize_srcu_expedited(&kvm->srcu); |
| 3451 | kfree(bus); |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3452 | |
| 3453 | return 0; |
| 3454 | } |
| 3455 | |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 3456 | /* Caller must hold slots_lock. */ |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3457 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
| 3458 | struct kvm_io_device *dev) |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3459 | { |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3460 | int i, r; |
| 3461 | struct kvm_io_bus *new_bus, *bus; |
Michael S. Tsirkin | 6c47469 | 2009-06-29 22:24:26 +0300 | [diff] [blame] | 3462 | |
Sasha Levin | cdfca7b | 2011-12-04 19:36:28 +0200 | [diff] [blame] | 3463 | bus = kvm->buses[bus_idx]; |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3464 | r = -ENOENT; |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3465 | for (i = 0; i < bus->dev_count; i++) |
| 3466 | if (bus->range[i].dev == dev) { |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3467 | r = 0; |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 3468 | break; |
| 3469 | } |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3470 | |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3471 | if (r) |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3472 | return r; |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3473 | |
Jason Wang | d3febdd | 2015-08-25 17:05:46 +0800 | [diff] [blame] | 3474 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) * |
Amos Kong | a1300716 | 2012-03-09 12:17:32 +0800 | [diff] [blame] | 3475 | sizeof(struct kvm_io_range)), GFP_KERNEL); |
| 3476 | if (!new_bus) |
| 3477 | return -ENOMEM; |
| 3478 | |
| 3479 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); |
| 3480 | new_bus->dev_count--; |
| 3481 | memcpy(new_bus->range + i, bus->range + i + 1, |
| 3482 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); |
Marcelo Tosatti | e93f8a0 | 2009-12-23 14:35:24 -0200 | [diff] [blame] | 3483 | |
| 3484 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
| 3485 | synchronize_srcu_expedited(&kvm->srcu); |
| 3486 | kfree(bus); |
| 3487 | return r; |
Gregory Haskins | 2eeb2e9 | 2007-05-31 14:08:53 -0400 | [diff] [blame] | 3488 | } |
| 3489 | |
Avi Kivity | 774c47f | 2007-02-12 00:54:47 -0800 | [diff] [blame] | 3490 | static struct notifier_block kvm_cpu_notifier = { |
| 3491 | .notifier_call = kvm_cpu_hotplug, |
Avi Kivity | 774c47f | 2007-02-12 00:54:47 -0800 | [diff] [blame] | 3492 | }; |
| 3493 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3494 | static int kvm_debugfs_open(struct inode *inode, struct file *file, |
| 3495 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
| 3496 | const char *fmt) |
| 3497 | { |
| 3498 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) |
| 3499 | inode->i_private; |
| 3500 | |
| 3501 | /* The debugfs files are a reference to the kvm struct which |
| 3502 | * is still valid when kvm_destroy_vm is called. |
| 3503 | * To avoid the race between open and the removal of the debugfs |
| 3504 | * directory we test against the users count. |
| 3505 | */ |
| 3506 | if (!atomic_add_unless(&stat_data->kvm->users_count, 1, 0)) |
| 3507 | return -ENOENT; |
| 3508 | |
| 3509 | if (simple_attr_open(inode, file, get, set, fmt)) { |
| 3510 | kvm_put_kvm(stat_data->kvm); |
| 3511 | return -ENOMEM; |
| 3512 | } |
| 3513 | |
| 3514 | return 0; |
| 3515 | } |
| 3516 | |
| 3517 | static int kvm_debugfs_release(struct inode *inode, struct file *file) |
| 3518 | { |
| 3519 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) |
| 3520 | inode->i_private; |
| 3521 | |
| 3522 | simple_attr_release(inode, file); |
| 3523 | kvm_put_kvm(stat_data->kvm); |
| 3524 | |
| 3525 | return 0; |
| 3526 | } |
| 3527 | |
| 3528 | static int vm_stat_get_per_vm(void *data, u64 *val) |
| 3529 | { |
| 3530 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
| 3531 | |
| 3532 | *val = *(u32 *)((void *)stat_data->kvm + stat_data->offset); |
| 3533 | |
| 3534 | return 0; |
| 3535 | } |
| 3536 | |
| 3537 | static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file) |
| 3538 | { |
| 3539 | __simple_attr_check_format("%llu\n", 0ull); |
| 3540 | return kvm_debugfs_open(inode, file, vm_stat_get_per_vm, |
| 3541 | NULL, "%llu\n"); |
| 3542 | } |
| 3543 | |
| 3544 | static const struct file_operations vm_stat_get_per_vm_fops = { |
| 3545 | .owner = THIS_MODULE, |
| 3546 | .open = vm_stat_get_per_vm_open, |
| 3547 | .release = kvm_debugfs_release, |
| 3548 | .read = simple_attr_read, |
| 3549 | .write = simple_attr_write, |
| 3550 | .llseek = generic_file_llseek, |
| 3551 | }; |
| 3552 | |
| 3553 | static int vcpu_stat_get_per_vm(void *data, u64 *val) |
| 3554 | { |
| 3555 | int i; |
| 3556 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
| 3557 | struct kvm_vcpu *vcpu; |
| 3558 | |
| 3559 | *val = 0; |
| 3560 | |
| 3561 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) |
| 3562 | *val += *(u32 *)((void *)vcpu + stat_data->offset); |
| 3563 | |
| 3564 | return 0; |
| 3565 | } |
| 3566 | |
| 3567 | static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file) |
| 3568 | { |
| 3569 | __simple_attr_check_format("%llu\n", 0ull); |
| 3570 | return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm, |
| 3571 | NULL, "%llu\n"); |
| 3572 | } |
| 3573 | |
| 3574 | static const struct file_operations vcpu_stat_get_per_vm_fops = { |
| 3575 | .owner = THIS_MODULE, |
| 3576 | .open = vcpu_stat_get_per_vm_open, |
| 3577 | .release = kvm_debugfs_release, |
| 3578 | .read = simple_attr_read, |
| 3579 | .write = simple_attr_write, |
| 3580 | .llseek = generic_file_llseek, |
| 3581 | }; |
| 3582 | |
| 3583 | static const struct file_operations *stat_fops_per_vm[] = { |
| 3584 | [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops, |
| 3585 | [KVM_STAT_VM] = &vm_stat_get_per_vm_fops, |
| 3586 | }; |
| 3587 | |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3588 | static int vm_stat_get(void *_offset, u64 *val) |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3589 | { |
| 3590 | unsigned offset = (long)_offset; |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3591 | struct kvm *kvm; |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3592 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
| 3593 | u64 tmp_val; |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3594 | |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3595 | *val = 0; |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 3596 | spin_lock(&kvm_lock); |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3597 | list_for_each_entry(kvm, &vm_list, vm_list) { |
| 3598 | stat_tmp.kvm = kvm; |
| 3599 | vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val); |
| 3600 | *val += tmp_val; |
| 3601 | } |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 3602 | spin_unlock(&kvm_lock); |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3603 | return 0; |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3604 | } |
| 3605 | |
| 3606 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); |
| 3607 | |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3608 | static int vcpu_stat_get(void *_offset, u64 *val) |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3609 | { |
| 3610 | unsigned offset = (long)_offset; |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3611 | struct kvm *kvm; |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3612 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
| 3613 | u64 tmp_val; |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3614 | |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3615 | *val = 0; |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 3616 | spin_lock(&kvm_lock); |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3617 | list_for_each_entry(kvm, &vm_list, vm_list) { |
| 3618 | stat_tmp.kvm = kvm; |
| 3619 | vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val); |
| 3620 | *val += tmp_val; |
| 3621 | } |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 3622 | spin_unlock(&kvm_lock); |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 3623 | return 0; |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3624 | } |
| 3625 | |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3626 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
| 3627 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 3628 | static const struct file_operations *stat_fops[] = { |
Avi Kivity | ba1389b | 2007-11-18 16:24:12 +0200 | [diff] [blame] | 3629 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
| 3630 | [KVM_STAT_VM] = &vm_stat_fops, |
| 3631 | }; |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3632 | |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3633 | static int kvm_init_debug(void) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3634 | { |
Paolo Bonzini | 0c8eb04 | 2013-10-30 12:12:13 +0100 | [diff] [blame] | 3635 | int r = -EEXIST; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3636 | struct kvm_stats_debugfs_item *p; |
| 3637 | |
Hollis Blanchard | 76f7c87 | 2008-04-15 16:05:42 -0500 | [diff] [blame] | 3638 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3639 | if (kvm_debugfs_dir == NULL) |
| 3640 | goto out; |
| 3641 | |
Janosch Frank | 536a6f8 | 2016-05-18 13:26:23 +0200 | [diff] [blame] | 3642 | kvm_debugfs_num_entries = 0; |
| 3643 | for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { |
Janosch Frank | 4bd33b5 | 2015-10-14 12:37:35 +0200 | [diff] [blame] | 3644 | if (!debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
| 3645 | (void *)(long)p->offset, |
| 3646 | stat_fops[p->kind])) |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3647 | goto out_dir; |
| 3648 | } |
| 3649 | |
| 3650 | return 0; |
| 3651 | |
| 3652 | out_dir: |
| 3653 | debugfs_remove_recursive(kvm_debugfs_dir); |
| 3654 | out: |
| 3655 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3656 | } |
| 3657 | |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3658 | static int kvm_suspend(void) |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3659 | { |
Alexander Graf | 10474ae | 2009-09-15 11:37:46 +0200 | [diff] [blame] | 3660 | if (kvm_usage_count) |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3661 | hardware_disable_nolock(NULL); |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3662 | return 0; |
| 3663 | } |
| 3664 | |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3665 | static void kvm_resume(void) |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3666 | { |
Zachary Amsden | ca84d1a | 2010-08-19 22:07:28 -1000 | [diff] [blame] | 3667 | if (kvm_usage_count) { |
Paolo Bonzini | 4a937f9 | 2013-09-10 12:58:35 +0200 | [diff] [blame] | 3668 | WARN_ON(raw_spin_is_locked(&kvm_count_lock)); |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3669 | hardware_enable_nolock(NULL); |
Zachary Amsden | ca84d1a | 2010-08-19 22:07:28 -1000 | [diff] [blame] | 3670 | } |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3671 | } |
| 3672 | |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3673 | static struct syscore_ops kvm_syscore_ops = { |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3674 | .suspend = kvm_suspend, |
| 3675 | .resume = kvm_resume, |
| 3676 | }; |
| 3677 | |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3678 | static inline |
| 3679 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) |
| 3680 | { |
| 3681 | return container_of(pn, struct kvm_vcpu, preempt_notifier); |
| 3682 | } |
| 3683 | |
| 3684 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) |
| 3685 | { |
| 3686 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); |
Xiubo Li | f95ef0c | 2015-02-26 14:58:23 +0800 | [diff] [blame] | 3687 | |
Raghavendra K T | 3a08a8f | 2013-03-04 23:32:07 +0530 | [diff] [blame] | 3688 | if (vcpu->preempted) |
| 3689 | vcpu->preempted = false; |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3690 | |
Radim Krčmář | e790d9e | 2014-08-21 18:08:05 +0200 | [diff] [blame] | 3691 | kvm_arch_sched_in(vcpu, cpu); |
| 3692 | |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3693 | kvm_arch_vcpu_load(vcpu, cpu); |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3694 | } |
| 3695 | |
| 3696 | static void kvm_sched_out(struct preempt_notifier *pn, |
| 3697 | struct task_struct *next) |
| 3698 | { |
| 3699 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); |
| 3700 | |
Raghavendra K T | 3a08a8f | 2013-03-04 23:32:07 +0530 | [diff] [blame] | 3701 | if (current->state == TASK_RUNNING) |
| 3702 | vcpu->preempted = true; |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3703 | kvm_arch_vcpu_put(vcpu); |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3704 | } |
| 3705 | |
Avi Kivity | 0ee75be | 2010-04-28 15:39:01 +0300 | [diff] [blame] | 3706 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3707 | struct module *module) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3708 | { |
| 3709 | int r; |
Yang, Sheng | 002c7f7 | 2007-07-31 14:23:01 +0300 | [diff] [blame] | 3710 | int cpu; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3711 | |
Zhang Xiantao | f8c16bb | 2007-11-14 20:40:21 +0800 | [diff] [blame] | 3712 | r = kvm_arch_init(opaque); |
| 3713 | if (r) |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3714 | goto out_fail; |
Zhang Xiantao | cb498ea | 2007-11-14 20:39:31 +0800 | [diff] [blame] | 3715 | |
Asias He | 7dac16c | 2013-05-08 10:57:29 +0800 | [diff] [blame] | 3716 | /* |
| 3717 | * kvm_arch_init makes sure there's at most one caller |
| 3718 | * for architectures that support multiple implementations, |
| 3719 | * like intel and amd on x86. |
| 3720 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating |
| 3721 | * conflicts in case kvm is already setup for another implementation. |
| 3722 | */ |
| 3723 | r = kvm_irqfd_init(); |
| 3724 | if (r) |
| 3725 | goto out_irqfd; |
| 3726 | |
Avi Kivity | 8437a61 | 2009-06-06 14:52:35 -0700 | [diff] [blame] | 3727 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3728 | r = -ENOMEM; |
| 3729 | goto out_free_0; |
| 3730 | } |
| 3731 | |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3732 | r = kvm_arch_hardware_setup(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3733 | if (r < 0) |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3734 | goto out_free_0a; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3735 | |
Yang, Sheng | 002c7f7 | 2007-07-31 14:23:01 +0300 | [diff] [blame] | 3736 | for_each_online_cpu(cpu) { |
| 3737 | smp_call_function_single(cpu, |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3738 | kvm_arch_check_processor_compat, |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 3739 | &r, 1); |
Yang, Sheng | 002c7f7 | 2007-07-31 14:23:01 +0300 | [diff] [blame] | 3740 | if (r < 0) |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3741 | goto out_free_1; |
Yang, Sheng | 002c7f7 | 2007-07-31 14:23:01 +0300 | [diff] [blame] | 3742 | } |
| 3743 | |
Avi Kivity | 774c47f | 2007-02-12 00:54:47 -0800 | [diff] [blame] | 3744 | r = register_cpu_notifier(&kvm_cpu_notifier); |
| 3745 | if (r) |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3746 | goto out_free_2; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3747 | register_reboot_notifier(&kvm_reboot_notifier); |
| 3748 | |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3749 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
Avi Kivity | 0ee75be | 2010-04-28 15:39:01 +0300 | [diff] [blame] | 3750 | if (!vcpu_align) |
| 3751 | vcpu_align = __alignof__(struct kvm_vcpu); |
| 3752 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, |
Joe Perches | 56919c5 | 2007-11-12 20:06:51 -0800 | [diff] [blame] | 3753 | 0, NULL); |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3754 | if (!kvm_vcpu_cache) { |
| 3755 | r = -ENOMEM; |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3756 | goto out_free_3; |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3757 | } |
| 3758 | |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3759 | r = kvm_async_pf_init(); |
| 3760 | if (r) |
| 3761 | goto out_free; |
| 3762 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3763 | kvm_chardev_ops.owner = module; |
Christian Borntraeger | 3d3aab1 | 2008-12-02 11:17:32 +0100 | [diff] [blame] | 3764 | kvm_vm_fops.owner = module; |
| 3765 | kvm_vcpu_fops.owner = module; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3766 | |
| 3767 | r = misc_register(&kvm_dev); |
| 3768 | if (r) { |
Xiubo Li | 1170adc | 2015-02-26 14:58:26 +0800 | [diff] [blame] | 3769 | pr_err("kvm: misc device register failed\n"); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3770 | goto out_unreg; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3771 | } |
| 3772 | |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3773 | register_syscore_ops(&kvm_syscore_ops); |
| 3774 | |
Avi Kivity | 15ad714 | 2007-07-11 18:17:21 +0300 | [diff] [blame] | 3775 | kvm_preempt_ops.sched_in = kvm_sched_in; |
| 3776 | kvm_preempt_ops.sched_out = kvm_sched_out; |
| 3777 | |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3778 | r = kvm_init_debug(); |
| 3779 | if (r) { |
Xiubo Li | 1170adc | 2015-02-26 14:58:26 +0800 | [diff] [blame] | 3780 | pr_err("kvm: create debugfs files failed\n"); |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3781 | goto out_undebugfs; |
| 3782 | } |
Darrick J. Wong | 0ea4ed8 | 2009-10-14 16:21:00 -0700 | [diff] [blame] | 3783 | |
Paolo Bonzini | 3c3c29f | 2014-09-24 13:02:46 +0200 | [diff] [blame] | 3784 | r = kvm_vfio_ops_init(); |
| 3785 | WARN_ON(r); |
| 3786 | |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 3787 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3788 | |
Hamo | 4f69b68 | 2011-12-15 14:23:16 +0800 | [diff] [blame] | 3789 | out_undebugfs: |
| 3790 | unregister_syscore_ops(&kvm_syscore_ops); |
Wei Yongjun | afc2f79 | 2013-05-05 20:03:40 +0800 | [diff] [blame] | 3791 | misc_deregister(&kvm_dev); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3792 | out_unreg: |
| 3793 | kvm_async_pf_deinit(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3794 | out_free: |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3795 | kmem_cache_destroy(kvm_vcpu_cache); |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3796 | out_free_3: |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3797 | unregister_reboot_notifier(&kvm_reboot_notifier); |
Avi Kivity | 774c47f | 2007-02-12 00:54:47 -0800 | [diff] [blame] | 3798 | unregister_cpu_notifier(&kvm_cpu_notifier); |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3799 | out_free_2: |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3800 | out_free_1: |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3801 | kvm_arch_hardware_unsetup(); |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3802 | out_free_0a: |
| 3803 | free_cpumask_var(cpus_hardware_enabled); |
Zhang Xiantao | d2308784 | 2007-11-29 15:35:39 +0800 | [diff] [blame] | 3804 | out_free_0: |
Cornelia Huck | a0f155e | 2013-02-28 12:33:18 +0100 | [diff] [blame] | 3805 | kvm_irqfd_exit(); |
| 3806 | out_irqfd: |
Asias He | 7dac16c | 2013-05-08 10:57:29 +0800 | [diff] [blame] | 3807 | kvm_arch_exit(); |
| 3808 | out_fail: |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3809 | return r; |
| 3810 | } |
Zhang Xiantao | cb498ea | 2007-11-14 20:39:31 +0800 | [diff] [blame] | 3811 | EXPORT_SYMBOL_GPL(kvm_init); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3812 | |
Zhang Xiantao | cb498ea | 2007-11-14 20:39:31 +0800 | [diff] [blame] | 3813 | void kvm_exit(void) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3814 | { |
Janosch Frank | 4bd33b5 | 2015-10-14 12:37:35 +0200 | [diff] [blame] | 3815 | debugfs_remove_recursive(kvm_debugfs_dir); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3816 | misc_deregister(&kvm_dev); |
Rusty Russell | c16f862 | 2007-07-30 21:12:19 +1000 | [diff] [blame] | 3817 | kmem_cache_destroy(kvm_vcpu_cache); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3818 | kvm_async_pf_deinit(); |
Rafael J. Wysocki | fb3600c | 2011-03-23 22:16:23 +0100 | [diff] [blame] | 3819 | unregister_syscore_ops(&kvm_syscore_ops); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3820 | unregister_reboot_notifier(&kvm_reboot_notifier); |
Avi Kivity | 59ae6c6 | 2007-02-12 00:54:48 -0800 | [diff] [blame] | 3821 | unregister_cpu_notifier(&kvm_cpu_notifier); |
Takuya Yoshikawa | 75b7127 | 2010-11-16 17:37:41 +0900 | [diff] [blame] | 3822 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
Zhang Xiantao | e9b11c1 | 2007-11-14 20:38:21 +0800 | [diff] [blame] | 3823 | kvm_arch_hardware_unsetup(); |
Zhang Xiantao | f8c16bb | 2007-11-14 20:40:21 +0800 | [diff] [blame] | 3824 | kvm_arch_exit(); |
Cornelia Huck | a0f155e | 2013-02-28 12:33:18 +0100 | [diff] [blame] | 3825 | kvm_irqfd_exit(); |
Rusty Russell | 7f59f49 | 2008-12-07 21:25:45 +1030 | [diff] [blame] | 3826 | free_cpumask_var(cpus_hardware_enabled); |
Wanpeng Li | 571ee1b | 2014-10-09 18:30:08 +0800 | [diff] [blame] | 3827 | kvm_vfio_ops_exit(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3828 | } |
Zhang Xiantao | cb498ea | 2007-11-14 20:39:31 +0800 | [diff] [blame] | 3829 | EXPORT_SYMBOL_GPL(kvm_exit); |