Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Core of Xen paravirt_ops implementation. |
| 3 | * |
| 4 | * This file contains the xen_paravirt_ops structure itself, and the |
| 5 | * implementations for: |
| 6 | * - privileged instructions |
| 7 | * - interrupt flags |
| 8 | * - segment operations |
| 9 | * - booting and setup |
| 10 | * |
| 11 | * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 |
| 12 | */ |
| 13 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 14 | #include <linux/cpu.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/smp.h> |
| 18 | #include <linux/preempt.h> |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 19 | #include <linux/hardirq.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 20 | #include <linux/percpu.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/start_kernel.h> |
| 23 | #include <linux/sched.h> |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 24 | #include <linux/kprobes.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 25 | #include <linux/bootmem.h> |
| 26 | #include <linux/module.h> |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 27 | #include <linux/mm.h> |
| 28 | #include <linux/page-flags.h> |
| 29 | #include <linux/highmem.h> |
Markus Armbruster | b8c2d3d | 2008-02-27 14:56:35 +0100 | [diff] [blame] | 30 | #include <linux/console.h> |
Chris Wright | 5d990b6 | 2009-12-04 12:15:21 -0800 | [diff] [blame] | 31 | #include <linux/pci.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/gfp.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 33 | |
Jeremy Fitzhardinge | 1ccbf53 | 2009-10-06 15:11:14 -0700 | [diff] [blame] | 34 | #include <xen/xen.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 35 | #include <xen/interface/xen.h> |
Jeremy Fitzhardinge | ecbf29c | 2008-12-16 12:37:07 -0800 | [diff] [blame] | 36 | #include <xen/interface/version.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 37 | #include <xen/interface/physdev.h> |
| 38 | #include <xen/interface/vcpu.h> |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 39 | #include <xen/interface/memory.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 40 | #include <xen/features.h> |
| 41 | #include <xen/page.h> |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 42 | #include <xen/hvm.h> |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 43 | #include <xen/hvc-console.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 44 | |
| 45 | #include <asm/paravirt.h> |
Ingo Molnar | 7b6aa33 | 2009-02-17 13:58:15 +0100 | [diff] [blame] | 46 | #include <asm/apic.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 47 | #include <asm/page.h> |
| 48 | #include <asm/xen/hypercall.h> |
| 49 | #include <asm/xen/hypervisor.h> |
| 50 | #include <asm/fixmap.h> |
| 51 | #include <asm/processor.h> |
Jeremy Fitzhardinge | 707ebbc | 2009-03-27 11:29:02 -0700 | [diff] [blame] | 52 | #include <asm/proto.h> |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 53 | #include <asm/msr-index.h> |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 54 | #include <asm/traps.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 55 | #include <asm/setup.h> |
| 56 | #include <asm/desc.h> |
Ian Campbell | 817a824 | 2010-02-26 17:16:00 +0000 | [diff] [blame] | 57 | #include <asm/pgalloc.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 58 | #include <asm/pgtable.h> |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 59 | #include <asm/tlbflush.h> |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 60 | #include <asm/reboot.h> |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 61 | #include <asm/setup.h> |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 62 | #include <asm/stackprotector.h> |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 63 | #include <asm/hypervisor.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 64 | |
| 65 | #include "xen-ops.h" |
Jeremy Fitzhardinge | 3b827c1 | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 66 | #include "mmu.h" |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 67 | #include "multicalls.h" |
| 68 | |
| 69 | EXPORT_SYMBOL_GPL(hypercall_page); |
| 70 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 71 | DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); |
| 72 | DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 73 | |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 74 | enum xen_domain_type xen_domain_type = XEN_NATIVE; |
| 75 | EXPORT_SYMBOL_GPL(xen_domain_type); |
| 76 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 77 | struct start_info *xen_start_info; |
| 78 | EXPORT_SYMBOL_GPL(xen_start_info); |
| 79 | |
Jeremy Fitzhardinge | a0d695c | 2008-05-26 23:31:21 +0100 | [diff] [blame] | 80 | struct shared_info xen_dummy_shared_info; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 81 | |
Jeremy Fitzhardinge | 3834143 | 2009-02-02 13:55:31 -0800 | [diff] [blame] | 82 | void *xen_initial_gdt; |
| 83 | |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 84 | RESERVE_BRK(shared_info_page_brk, PAGE_SIZE); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 85 | __read_mostly int xen_have_vector_callback; |
| 86 | EXPORT_SYMBOL_GPL(xen_have_vector_callback); |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 87 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 88 | /* |
| 89 | * Point at some empty memory to start with. We map the real shared_info |
| 90 | * page as soon as fixmap is up and running. |
| 91 | */ |
Jeremy Fitzhardinge | a0d695c | 2008-05-26 23:31:21 +0100 | [diff] [blame] | 92 | struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 93 | |
| 94 | /* |
| 95 | * Flag to determine whether vcpu info placement is available on all |
| 96 | * VCPUs. We assume it is to start with, and then set it to zero on |
| 97 | * the first failure. This is because it can succeed on some VCPUs |
| 98 | * and not others, since it can involve hypervisor memory allocation, |
| 99 | * or because the guest failed to guarantee all the appropriate |
| 100 | * constraints on all VCPUs (ie buffer can't cross a page boundary). |
| 101 | * |
| 102 | * Note that any particular CPU may be using a placed vcpu structure, |
| 103 | * but we can only optimise if the all are. |
| 104 | * |
| 105 | * 0: not available, 1: available |
| 106 | */ |
Jeremy Fitzhardinge | e4d0407 | 2009-02-02 13:55:54 -0800 | [diff] [blame] | 107 | static int have_vcpu_info_placement = 1; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 108 | |
Mukesh Rathor | c06ee78 | 2010-07-19 10:25:08 -0700 | [diff] [blame] | 109 | static void clamp_max_cpus(void) |
| 110 | { |
| 111 | #ifdef CONFIG_SMP |
| 112 | if (setup_max_cpus > MAX_VIRT_CPUS) |
| 113 | setup_max_cpus = MAX_VIRT_CPUS; |
| 114 | #endif |
| 115 | } |
| 116 | |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 117 | static void xen_vcpu_setup(int cpu) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 118 | { |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 119 | struct vcpu_register_vcpu_info info; |
| 120 | int err; |
| 121 | struct vcpu_info *vcpup; |
| 122 | |
Jeremy Fitzhardinge | a0d695c | 2008-05-26 23:31:21 +0100 | [diff] [blame] | 123 | BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 124 | |
Mukesh Rathor | c06ee78 | 2010-07-19 10:25:08 -0700 | [diff] [blame] | 125 | if (cpu < MAX_VIRT_CPUS) |
| 126 | per_cpu(xen_vcpu,cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
| 127 | |
| 128 | if (!have_vcpu_info_placement) { |
| 129 | if (cpu >= MAX_VIRT_CPUS) |
| 130 | clamp_max_cpus(); |
| 131 | return; |
| 132 | } |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 133 | |
| 134 | vcpup = &per_cpu(xen_vcpu_info, cpu); |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 135 | info.mfn = arbitrary_virt_to_mfn(vcpup); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 136 | info.offset = offset_in_page(vcpup); |
| 137 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 138 | /* Check to see if the hypervisor will put the vcpu_info |
| 139 | structure where we want it, which allows direct access via |
| 140 | a percpu-variable. */ |
| 141 | err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); |
| 142 | |
| 143 | if (err) { |
| 144 | printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); |
| 145 | have_vcpu_info_placement = 0; |
Mukesh Rathor | c06ee78 | 2010-07-19 10:25:08 -0700 | [diff] [blame] | 146 | clamp_max_cpus(); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 147 | } else { |
| 148 | /* This cpu is using the registered vcpu info, even if |
| 149 | later ones fail to. */ |
| 150 | per_cpu(xen_vcpu, cpu) = vcpup; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 151 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 154 | /* |
| 155 | * On restore, set the vcpu placement up again. |
| 156 | * If it fails, then we're in a bad state, since |
| 157 | * we can't back out from using it... |
| 158 | */ |
| 159 | void xen_vcpu_restore(void) |
| 160 | { |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 161 | int cpu; |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 162 | |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 163 | for_each_online_cpu(cpu) { |
| 164 | bool other_cpu = (cpu != smp_processor_id()); |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 165 | |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 166 | if (other_cpu && |
| 167 | HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL)) |
| 168 | BUG(); |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 169 | |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 170 | xen_setup_runstate_info(cpu); |
Ian Campbell | be01292 | 2009-11-21 08:35:55 +0800 | [diff] [blame] | 171 | |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 172 | if (have_vcpu_info_placement) |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 173 | xen_vcpu_setup(cpu); |
| 174 | |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 175 | if (other_cpu && |
| 176 | HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) |
| 177 | BUG(); |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 178 | } |
| 179 | } |
| 180 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 181 | static void __init xen_banner(void) |
| 182 | { |
Jeremy Fitzhardinge | 95c7c23 | 2008-07-15 13:42:34 -0700 | [diff] [blame] | 183 | unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL); |
| 184 | struct xen_extraversion extra; |
| 185 | HYPERVISOR_xen_version(XENVER_extraversion, &extra); |
| 186 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 187 | printk(KERN_INFO "Booting paravirtualized kernel on %s\n", |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 188 | pv_info.name); |
Jeremy Fitzhardinge | 95c7c23 | 2008-07-15 13:42:34 -0700 | [diff] [blame] | 189 | printk(KERN_INFO "Xen version: %d.%d%s%s\n", |
| 190 | version >> 16, version & 0xffff, extra.extraversion, |
Jeremy Fitzhardinge | e57778a | 2008-06-16 04:30:02 -0700 | [diff] [blame] | 191 | xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : ""); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 192 | } |
| 193 | |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 194 | static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0; |
| 195 | static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0; |
| 196 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 197 | static void xen_cpuid(unsigned int *ax, unsigned int *bx, |
| 198 | unsigned int *cx, unsigned int *dx) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 199 | { |
Jeremy Fitzhardinge | 82d6469 | 2009-10-22 16:41:15 -0700 | [diff] [blame] | 200 | unsigned maskebx = ~0; |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 201 | unsigned maskecx = ~0; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 202 | unsigned maskedx = ~0; |
| 203 | |
| 204 | /* |
| 205 | * Mask out inconvenient features, to try and disable as many |
| 206 | * unsupported kernel subsystems as possible. |
| 207 | */ |
Jeremy Fitzhardinge | 82d6469 | 2009-10-22 16:41:15 -0700 | [diff] [blame] | 208 | switch (*ax) { |
| 209 | case 1: |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 210 | maskecx = cpuid_leaf1_ecx_mask; |
| 211 | maskedx = cpuid_leaf1_edx_mask; |
Jeremy Fitzhardinge | 82d6469 | 2009-10-22 16:41:15 -0700 | [diff] [blame] | 212 | break; |
| 213 | |
| 214 | case 0xb: |
| 215 | /* Suppress extended topology stuff */ |
| 216 | maskebx = 0; |
| 217 | break; |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 218 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 219 | |
| 220 | asm(XEN_EMULATE_PREFIX "cpuid" |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 221 | : "=a" (*ax), |
| 222 | "=b" (*bx), |
| 223 | "=c" (*cx), |
| 224 | "=d" (*dx) |
| 225 | : "0" (*ax), "2" (*cx)); |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 226 | |
Jeremy Fitzhardinge | 82d6469 | 2009-10-22 16:41:15 -0700 | [diff] [blame] | 227 | *bx &= maskebx; |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 228 | *cx &= maskecx; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 229 | *dx &= maskedx; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 230 | } |
| 231 | |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 232 | static __init void xen_init_cpuid_mask(void) |
| 233 | { |
| 234 | unsigned int ax, bx, cx, dx; |
| 235 | |
| 236 | cpuid_leaf1_edx_mask = |
| 237 | ~((1 << X86_FEATURE_MCE) | /* disable MCE */ |
| 238 | (1 << X86_FEATURE_MCA) | /* disable MCA */ |
| 239 | (1 << X86_FEATURE_ACC)); /* thermal monitoring */ |
| 240 | |
| 241 | if (!xen_initial_domain()) |
| 242 | cpuid_leaf1_edx_mask &= |
| 243 | ~((1 << X86_FEATURE_APIC) | /* disable local APIC */ |
| 244 | (1 << X86_FEATURE_ACPI)); /* disable ACPI */ |
| 245 | |
| 246 | ax = 1; |
H. Peter Anvin | 7adb4df | 2009-08-25 21:06:03 -0700 | [diff] [blame] | 247 | cx = 0; |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 248 | xen_cpuid(&ax, &bx, &cx, &dx); |
| 249 | |
| 250 | /* cpuid claims we support xsave; try enabling it to see what happens */ |
| 251 | if (cx & (1 << (X86_FEATURE_XSAVE % 32))) { |
| 252 | unsigned long cr4; |
| 253 | |
| 254 | set_in_cr4(X86_CR4_OSXSAVE); |
| 255 | |
| 256 | cr4 = read_cr4(); |
| 257 | |
| 258 | if ((cr4 & X86_CR4_OSXSAVE) == 0) |
| 259 | cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_XSAVE % 32)); |
| 260 | |
| 261 | clear_in_cr4(X86_CR4_OSXSAVE); |
| 262 | } |
| 263 | } |
| 264 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 265 | static void xen_set_debugreg(int reg, unsigned long val) |
| 266 | { |
| 267 | HYPERVISOR_set_debugreg(reg, val); |
| 268 | } |
| 269 | |
| 270 | static unsigned long xen_get_debugreg(int reg) |
| 271 | { |
| 272 | return HYPERVISOR_get_debugreg(reg); |
| 273 | } |
| 274 | |
Jeremy Fitzhardinge | 224101e | 2009-02-18 11:18:57 -0800 | [diff] [blame] | 275 | static void xen_end_context_switch(struct task_struct *next) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 276 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 277 | xen_mc_flush(); |
Jeremy Fitzhardinge | 224101e | 2009-02-18 11:18:57 -0800 | [diff] [blame] | 278 | paravirt_end_context_switch(next); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | static unsigned long xen_store_tr(void) |
| 282 | { |
| 283 | return 0; |
| 284 | } |
| 285 | |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 286 | /* |
Jeremy Fitzhardinge | cef43bf | 2008-07-28 13:33:44 -0700 | [diff] [blame] | 287 | * Set the page permissions for a particular virtual address. If the |
| 288 | * address is a vmalloc mapping (or other non-linear mapping), then |
| 289 | * find the linear mapping of the page and also set its protections to |
| 290 | * match. |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 291 | */ |
| 292 | static void set_aliased_prot(void *v, pgprot_t prot) |
| 293 | { |
| 294 | int level; |
| 295 | pte_t *ptep; |
| 296 | pte_t pte; |
| 297 | unsigned long pfn; |
| 298 | struct page *page; |
| 299 | |
| 300 | ptep = lookup_address((unsigned long)v, &level); |
| 301 | BUG_ON(ptep == NULL); |
| 302 | |
| 303 | pfn = pte_pfn(*ptep); |
| 304 | page = pfn_to_page(pfn); |
| 305 | |
| 306 | pte = pfn_pte(pfn, prot); |
| 307 | |
| 308 | if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0)) |
| 309 | BUG(); |
| 310 | |
| 311 | if (!PageHighMem(page)) { |
| 312 | void *av = __va(PFN_PHYS(pfn)); |
| 313 | |
| 314 | if (av != v) |
| 315 | if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0)) |
| 316 | BUG(); |
| 317 | } else |
| 318 | kmap_flush_unused(); |
| 319 | } |
| 320 | |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 321 | static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries) |
| 322 | { |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 323 | const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 324 | int i; |
| 325 | |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 326 | for(i = 0; i < entries; i += entries_per_page) |
| 327 | set_aliased_prot(ldt + i, PAGE_KERNEL_RO); |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | static void xen_free_ldt(struct desc_struct *ldt, unsigned entries) |
| 331 | { |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 332 | const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 333 | int i; |
| 334 | |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 335 | for(i = 0; i < entries; i += entries_per_page) |
| 336 | set_aliased_prot(ldt + i, PAGE_KERNEL); |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 339 | static void xen_set_ldt(const void *addr, unsigned entries) |
| 340 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 341 | struct mmuext_op *op; |
| 342 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); |
| 343 | |
| 344 | op = mcs.args; |
| 345 | op->cmd = MMUEXT_SET_LDT; |
Jan Beulich | 4dbf7af | 2008-01-30 13:33:14 +0100 | [diff] [blame] | 346 | op->arg1.linear_addr = (unsigned long)addr; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 347 | op->arg2.nr_ents = entries; |
| 348 | |
| 349 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); |
| 350 | |
| 351 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 352 | } |
| 353 | |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 354 | static void xen_load_gdt(const struct desc_ptr *dtr) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 355 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 356 | unsigned long va = dtr->address; |
| 357 | unsigned int size = dtr->size + 1; |
| 358 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; |
Jeremy Fitzhardinge | 3ce5fa7 | 2009-03-04 15:26:00 -0800 | [diff] [blame] | 359 | unsigned long frames[pages]; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 360 | int f; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 361 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 362 | /* |
| 363 | * A GDT can be up to 64k in size, which corresponds to 8192 |
| 364 | * 8-byte entries, or 16 4k pages.. |
| 365 | */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 366 | |
| 367 | BUG_ON(size > 65536); |
| 368 | BUG_ON(va & ~PAGE_MASK); |
| 369 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 370 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { |
Jeremy Fitzhardinge | 6ed6bf42 | 2009-03-04 13:02:18 -0800 | [diff] [blame] | 371 | int level; |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 372 | pte_t *ptep; |
Jeremy Fitzhardinge | 6ed6bf42 | 2009-03-04 13:02:18 -0800 | [diff] [blame] | 373 | unsigned long pfn, mfn; |
| 374 | void *virt; |
| 375 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 376 | /* |
| 377 | * The GDT is per-cpu and is in the percpu data area. |
| 378 | * That can be virtually mapped, so we need to do a |
| 379 | * page-walk to get the underlying MFN for the |
| 380 | * hypercall. The page can also be in the kernel's |
| 381 | * linear range, so we need to RO that mapping too. |
| 382 | */ |
| 383 | ptep = lookup_address(va, &level); |
Jeremy Fitzhardinge | 6ed6bf42 | 2009-03-04 13:02:18 -0800 | [diff] [blame] | 384 | BUG_ON(ptep == NULL); |
| 385 | |
| 386 | pfn = pte_pfn(*ptep); |
| 387 | mfn = pfn_to_mfn(pfn); |
| 388 | virt = __va(PFN_PHYS(pfn)); |
| 389 | |
| 390 | frames[f] = mfn; |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 391 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 392 | make_lowmem_page_readonly((void *)va); |
Jeremy Fitzhardinge | 6ed6bf42 | 2009-03-04 13:02:18 -0800 | [diff] [blame] | 393 | make_lowmem_page_readonly(virt); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 394 | } |
| 395 | |
Jeremy Fitzhardinge | 3ce5fa7 | 2009-03-04 15:26:00 -0800 | [diff] [blame] | 396 | if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct))) |
| 397 | BUG(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 398 | } |
| 399 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 400 | /* |
| 401 | * load_gdt for early boot, when the gdt is only mapped once |
| 402 | */ |
| 403 | static __init void xen_load_gdt_boot(const struct desc_ptr *dtr) |
| 404 | { |
| 405 | unsigned long va = dtr->address; |
| 406 | unsigned int size = dtr->size + 1; |
| 407 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; |
| 408 | unsigned long frames[pages]; |
| 409 | int f; |
| 410 | |
| 411 | /* |
| 412 | * A GDT can be up to 64k in size, which corresponds to 8192 |
| 413 | * 8-byte entries, or 16 4k pages.. |
| 414 | */ |
| 415 | |
| 416 | BUG_ON(size > 65536); |
| 417 | BUG_ON(va & ~PAGE_MASK); |
| 418 | |
| 419 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { |
| 420 | pte_t pte; |
| 421 | unsigned long pfn, mfn; |
| 422 | |
| 423 | pfn = virt_to_pfn(va); |
| 424 | mfn = pfn_to_mfn(pfn); |
| 425 | |
| 426 | pte = pfn_pte(pfn, PAGE_KERNEL_RO); |
| 427 | |
| 428 | if (HYPERVISOR_update_va_mapping((unsigned long)va, pte, 0)) |
| 429 | BUG(); |
| 430 | |
| 431 | frames[f] = mfn; |
| 432 | } |
| 433 | |
| 434 | if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct))) |
| 435 | BUG(); |
| 436 | } |
| 437 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 438 | static void load_TLS_descriptor(struct thread_struct *t, |
| 439 | unsigned int cpu, unsigned int i) |
| 440 | { |
| 441 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 442 | xmaddr_t maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 443 | struct multicall_space mc = __xen_mc_entry(0); |
| 444 | |
| 445 | MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]); |
| 446 | } |
| 447 | |
| 448 | static void xen_load_tls(struct thread_struct *t, unsigned int cpu) |
| 449 | { |
Jeremy Fitzhardinge | 8b84ad9 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 450 | /* |
Tejun Heo | ccbeed3 | 2009-02-09 22:17:40 +0900 | [diff] [blame] | 451 | * XXX sleazy hack: If we're being called in a lazy-cpu zone |
| 452 | * and lazy gs handling is enabled, it means we're in a |
| 453 | * context switch, and %gs has just been saved. This means we |
| 454 | * can zero it out to prevent faults on exit from the |
| 455 | * hypervisor if the next process has no %gs. Either way, it |
| 456 | * has been saved, and the new value will get loaded properly. |
| 457 | * This will go away as soon as Xen has been modified to not |
| 458 | * save/restore %gs for normal hypercalls. |
Eduardo Habkost | 8a95408 | 2008-07-08 15:07:10 -0700 | [diff] [blame] | 459 | * |
| 460 | * On x86_64, this hack is not used for %gs, because gs points |
| 461 | * to KERNEL_GS_BASE (and uses it for PDA references), so we |
| 462 | * must not zero %gs on x86_64 |
| 463 | * |
| 464 | * For x86_64, we need to zero %fs, otherwise we may get an |
| 465 | * exception between the new %fs descriptor being loaded and |
| 466 | * %fs being effectively cleared at __switch_to(). |
Jeremy Fitzhardinge | 8b84ad9 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 467 | */ |
Eduardo Habkost | 8a95408 | 2008-07-08 15:07:10 -0700 | [diff] [blame] | 468 | if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) { |
| 469 | #ifdef CONFIG_X86_32 |
Tejun Heo | ccbeed3 | 2009-02-09 22:17:40 +0900 | [diff] [blame] | 470 | lazy_load_gs(0); |
Eduardo Habkost | 8a95408 | 2008-07-08 15:07:10 -0700 | [diff] [blame] | 471 | #else |
| 472 | loadsegment(fs, 0); |
| 473 | #endif |
| 474 | } |
| 475 | |
| 476 | xen_mc_batch(); |
| 477 | |
| 478 | load_TLS_descriptor(t, cpu, 0); |
| 479 | load_TLS_descriptor(t, cpu, 1); |
| 480 | load_TLS_descriptor(t, cpu, 2); |
| 481 | |
| 482 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 483 | } |
| 484 | |
Eduardo Habkost | a8fc108 | 2008-07-08 15:07:05 -0700 | [diff] [blame] | 485 | #ifdef CONFIG_X86_64 |
| 486 | static void xen_load_gs_index(unsigned int idx) |
| 487 | { |
| 488 | if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx)) |
| 489 | BUG(); |
| 490 | } |
| 491 | #endif |
| 492 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 493 | static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, |
Glauber de Oliveira Costa | 75b8bb3 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 494 | const void *ptr) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 495 | { |
Jeremy Fitzhardinge | cef43bf | 2008-07-28 13:33:44 -0700 | [diff] [blame] | 496 | xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]); |
Glauber de Oliveira Costa | 75b8bb3 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 497 | u64 entry = *(u64 *)ptr; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 498 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 499 | preempt_disable(); |
| 500 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 501 | xen_mc_flush(); |
| 502 | if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry)) |
| 503 | BUG(); |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 504 | |
| 505 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 506 | } |
| 507 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 508 | static int cvt_gate_to_trap(int vector, const gate_desc *val, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 509 | struct trap_info *info) |
| 510 | { |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 511 | unsigned long addr; |
| 512 | |
Jeremy Fitzhardinge | 6d02c42 | 2009-03-29 22:57:15 -0700 | [diff] [blame] | 513 | if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 514 | return 0; |
| 515 | |
| 516 | info->vector = vector; |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 517 | |
| 518 | addr = gate_offset(*val); |
| 519 | #ifdef CONFIG_X86_64 |
Jeremy Fitzhardinge | b80119b | 2009-04-24 00:22:08 -0700 | [diff] [blame] | 520 | /* |
| 521 | * Look for known traps using IST, and substitute them |
| 522 | * appropriately. The debugger ones are the only ones we care |
| 523 | * about. Xen will handle faults like double_fault and |
| 524 | * machine_check, so we should never see them. Warn if |
| 525 | * there's an unexpected IST-using fault handler. |
| 526 | */ |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 527 | if (addr == (unsigned long)debug) |
| 528 | addr = (unsigned long)xen_debug; |
| 529 | else if (addr == (unsigned long)int3) |
| 530 | addr = (unsigned long)xen_int3; |
| 531 | else if (addr == (unsigned long)stack_segment) |
| 532 | addr = (unsigned long)xen_stack_segment; |
Jeremy Fitzhardinge | b80119b | 2009-04-24 00:22:08 -0700 | [diff] [blame] | 533 | else if (addr == (unsigned long)double_fault || |
| 534 | addr == (unsigned long)nmi) { |
| 535 | /* Don't need to handle these */ |
| 536 | return 0; |
| 537 | #ifdef CONFIG_X86_MCE |
| 538 | } else if (addr == (unsigned long)machine_check) { |
| 539 | return 0; |
| 540 | #endif |
| 541 | } else { |
| 542 | /* Some other trap using IST? */ |
| 543 | if (WARN_ON(val->ist != 0)) |
| 544 | return 0; |
| 545 | } |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 546 | #endif /* CONFIG_X86_64 */ |
| 547 | info->address = addr; |
| 548 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 549 | info->cs = gate_segment(*val); |
| 550 | info->flags = val->dpl; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 551 | /* interrupt gates clear IF */ |
Jeremy Fitzhardinge | 6d02c42 | 2009-03-29 22:57:15 -0700 | [diff] [blame] | 552 | if (val->type == GATE_INTERRUPT) |
| 553 | info->flags |= 1 << 2; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 554 | |
| 555 | return 1; |
| 556 | } |
| 557 | |
| 558 | /* Locations of each CPU's IDT */ |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 559 | static DEFINE_PER_CPU(struct desc_ptr, idt_desc); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 560 | |
| 561 | /* Set an IDT entry. If the entry is part of the current IDT, then |
| 562 | also update Xen. */ |
Glauber de Oliveira Costa | 8d94734 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 563 | static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 564 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 565 | unsigned long p = (unsigned long)&dt[entrynum]; |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 566 | unsigned long start, end; |
| 567 | |
| 568 | preempt_disable(); |
| 569 | |
| 570 | start = __get_cpu_var(idt_desc).address; |
| 571 | end = start + __get_cpu_var(idt_desc).size + 1; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 572 | |
| 573 | xen_mc_flush(); |
| 574 | |
Glauber de Oliveira Costa | 8d94734 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 575 | native_write_idt_entry(dt, entrynum, g); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 576 | |
| 577 | if (p >= start && (p + 8) <= end) { |
| 578 | struct trap_info info[2]; |
| 579 | |
| 580 | info[1].address = 0; |
| 581 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 582 | if (cvt_gate_to_trap(entrynum, g, &info[0])) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 583 | if (HYPERVISOR_set_trap_table(info)) |
| 584 | BUG(); |
| 585 | } |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 586 | |
| 587 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 588 | } |
| 589 | |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 590 | static void xen_convert_trap_info(const struct desc_ptr *desc, |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 591 | struct trap_info *traps) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 592 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 593 | unsigned in, out, count; |
| 594 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 595 | count = (desc->size+1) / sizeof(gate_desc); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 596 | BUG_ON(count > 256); |
| 597 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 598 | for (in = out = 0; in < count; in++) { |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 599 | gate_desc *entry = (gate_desc*)(desc->address) + in; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 600 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 601 | if (cvt_gate_to_trap(in, entry, &traps[out])) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 602 | out++; |
| 603 | } |
| 604 | traps[out].address = 0; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 605 | } |
| 606 | |
| 607 | void xen_copy_trap_info(struct trap_info *traps) |
| 608 | { |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 609 | const struct desc_ptr *desc = &__get_cpu_var(idt_desc); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 610 | |
| 611 | xen_convert_trap_info(desc, traps); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 612 | } |
| 613 | |
| 614 | /* Load a new IDT into Xen. In principle this can be per-CPU, so we |
| 615 | hold a spinlock to protect the static traps[] array (static because |
| 616 | it avoids allocation, and saves stack space). */ |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 617 | static void xen_load_idt(const struct desc_ptr *desc) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 618 | { |
| 619 | static DEFINE_SPINLOCK(lock); |
| 620 | static struct trap_info traps[257]; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 621 | |
| 622 | spin_lock(&lock); |
| 623 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 624 | __get_cpu_var(idt_desc) = *desc; |
| 625 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 626 | xen_convert_trap_info(desc, traps); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 627 | |
| 628 | xen_mc_flush(); |
| 629 | if (HYPERVISOR_set_trap_table(traps)) |
| 630 | BUG(); |
| 631 | |
| 632 | spin_unlock(&lock); |
| 633 | } |
| 634 | |
| 635 | /* Write a GDT descriptor entry. Ignore LDT descriptors, since |
| 636 | they're handled differently. */ |
| 637 | static void xen_write_gdt_entry(struct desc_struct *dt, int entry, |
Glauber de Oliveira Costa | 014b15b | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 638 | const void *desc, int type) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 639 | { |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 640 | preempt_disable(); |
| 641 | |
Glauber de Oliveira Costa | 014b15b | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 642 | switch (type) { |
| 643 | case DESC_LDT: |
| 644 | case DESC_TSS: |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 645 | /* ignore */ |
| 646 | break; |
| 647 | |
| 648 | default: { |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 649 | xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 650 | |
| 651 | xen_mc_flush(); |
Glauber de Oliveira Costa | 014b15b | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 652 | if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 653 | BUG(); |
| 654 | } |
| 655 | |
| 656 | } |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 657 | |
| 658 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 659 | } |
| 660 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 661 | /* |
| 662 | * Version of write_gdt_entry for use at early boot-time needed to |
| 663 | * update an entry as simply as possible. |
| 664 | */ |
| 665 | static __init void xen_write_gdt_entry_boot(struct desc_struct *dt, int entry, |
| 666 | const void *desc, int type) |
| 667 | { |
| 668 | switch (type) { |
| 669 | case DESC_LDT: |
| 670 | case DESC_TSS: |
| 671 | /* ignore */ |
| 672 | break; |
| 673 | |
| 674 | default: { |
| 675 | xmaddr_t maddr = virt_to_machine(&dt[entry]); |
| 676 | |
| 677 | if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) |
| 678 | dt[entry] = *(struct desc_struct *)desc; |
| 679 | } |
| 680 | |
| 681 | } |
| 682 | } |
| 683 | |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 684 | static void xen_load_sp0(struct tss_struct *tss, |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 685 | struct thread_struct *thread) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 686 | { |
| 687 | struct multicall_space mcs = xen_mc_entry(0); |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 688 | MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 689 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 690 | } |
| 691 | |
| 692 | static void xen_set_iopl_mask(unsigned mask) |
| 693 | { |
| 694 | struct physdev_set_iopl set_iopl; |
| 695 | |
| 696 | /* Force the change at ring 0. */ |
| 697 | set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3; |
| 698 | HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); |
| 699 | } |
| 700 | |
| 701 | static void xen_io_delay(void) |
| 702 | { |
| 703 | } |
| 704 | |
| 705 | #ifdef CONFIG_X86_LOCAL_APIC |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 706 | static u32 xen_apic_read(u32 reg) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 707 | { |
| 708 | return 0; |
| 709 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 710 | |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 711 | static void xen_apic_write(u32 reg, u32 val) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 712 | { |
| 713 | /* Warn to see if there's any stray references */ |
| 714 | WARN_ON(1); |
| 715 | } |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 716 | |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 717 | static u64 xen_apic_icr_read(void) |
| 718 | { |
| 719 | return 0; |
| 720 | } |
| 721 | |
| 722 | static void xen_apic_icr_write(u32 low, u32 id) |
| 723 | { |
| 724 | /* Warn to see if there's any stray references */ |
| 725 | WARN_ON(1); |
| 726 | } |
| 727 | |
| 728 | static void xen_apic_wait_icr_idle(void) |
| 729 | { |
| 730 | return; |
| 731 | } |
| 732 | |
Yinghai Lu | 94a8c3c | 2008-07-13 22:19:35 -0700 | [diff] [blame] | 733 | static u32 xen_safe_apic_wait_icr_idle(void) |
| 734 | { |
| 735 | return 0; |
| 736 | } |
| 737 | |
Yinghai Lu | c1eeb2d | 2009-02-16 23:02:14 -0800 | [diff] [blame] | 738 | static void set_xen_basic_apic_ops(void) |
| 739 | { |
| 740 | apic->read = xen_apic_read; |
| 741 | apic->write = xen_apic_write; |
| 742 | apic->icr_read = xen_apic_icr_read; |
| 743 | apic->icr_write = xen_apic_icr_write; |
| 744 | apic->wait_icr_idle = xen_apic_wait_icr_idle; |
| 745 | apic->safe_wait_icr_idle = xen_safe_apic_wait_icr_idle; |
| 746 | } |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 747 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 748 | #endif |
| 749 | |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 750 | static void xen_clts(void) |
| 751 | { |
| 752 | struct multicall_space mcs; |
| 753 | |
| 754 | mcs = xen_mc_entry(0); |
| 755 | |
| 756 | MULTI_fpu_taskswitch(mcs.mc, 0); |
| 757 | |
| 758 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 759 | } |
| 760 | |
Jeremy Fitzhardinge | a789ed5 | 2009-04-24 00:26:50 -0700 | [diff] [blame] | 761 | static DEFINE_PER_CPU(unsigned long, xen_cr0_value); |
| 762 | |
| 763 | static unsigned long xen_read_cr0(void) |
| 764 | { |
| 765 | unsigned long cr0 = percpu_read(xen_cr0_value); |
| 766 | |
| 767 | if (unlikely(cr0 == 0)) { |
| 768 | cr0 = native_read_cr0(); |
| 769 | percpu_write(xen_cr0_value, cr0); |
| 770 | } |
| 771 | |
| 772 | return cr0; |
| 773 | } |
| 774 | |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 775 | static void xen_write_cr0(unsigned long cr0) |
| 776 | { |
| 777 | struct multicall_space mcs; |
| 778 | |
Jeremy Fitzhardinge | a789ed5 | 2009-04-24 00:26:50 -0700 | [diff] [blame] | 779 | percpu_write(xen_cr0_value, cr0); |
| 780 | |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 781 | /* Only pay attention to cr0.TS; everything else is |
| 782 | ignored. */ |
| 783 | mcs = xen_mc_entry(0); |
| 784 | |
| 785 | MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0); |
| 786 | |
| 787 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 788 | } |
| 789 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 790 | static void xen_write_cr4(unsigned long cr4) |
| 791 | { |
Jeremy Fitzhardinge | 2956a35 | 2008-05-26 23:31:04 +0100 | [diff] [blame] | 792 | cr4 &= ~X86_CR4_PGE; |
| 793 | cr4 &= ~X86_CR4_PSE; |
| 794 | |
| 795 | native_write_cr4(cr4); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 796 | } |
| 797 | |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 798 | static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high) |
| 799 | { |
| 800 | int ret; |
| 801 | |
| 802 | ret = 0; |
| 803 | |
Tej | f63c2f2 | 2008-12-16 11:56:06 -0800 | [diff] [blame] | 804 | switch (msr) { |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 805 | #ifdef CONFIG_X86_64 |
| 806 | unsigned which; |
| 807 | u64 base; |
| 808 | |
| 809 | case MSR_FS_BASE: which = SEGBASE_FS; goto set; |
| 810 | case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set; |
| 811 | case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set; |
| 812 | |
| 813 | set: |
| 814 | base = ((u64)high << 32) | low; |
| 815 | if (HYPERVISOR_set_segment_base(which, base) != 0) |
H. Peter Anvin | 0cc0213 | 2009-08-31 14:23:29 -0700 | [diff] [blame] | 816 | ret = -EIO; |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 817 | break; |
| 818 | #endif |
Jeremy Fitzhardinge | d89961e | 2008-07-24 13:48:58 -0700 | [diff] [blame] | 819 | |
| 820 | case MSR_STAR: |
| 821 | case MSR_CSTAR: |
| 822 | case MSR_LSTAR: |
| 823 | case MSR_SYSCALL_MASK: |
| 824 | case MSR_IA32_SYSENTER_CS: |
| 825 | case MSR_IA32_SYSENTER_ESP: |
| 826 | case MSR_IA32_SYSENTER_EIP: |
| 827 | /* Fast syscall setup is all done in hypercalls, so |
| 828 | these are all ignored. Stub them out here to stop |
| 829 | Xen console noise. */ |
| 830 | break; |
| 831 | |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 832 | default: |
| 833 | ret = native_write_msr_safe(msr, low, high); |
| 834 | } |
| 835 | |
| 836 | return ret; |
| 837 | } |
| 838 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 839 | void xen_setup_shared_info(void) |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 840 | { |
| 841 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
Jeremy Fitzhardinge | 15664f9 | 2008-07-08 15:06:47 -0700 | [diff] [blame] | 842 | set_fixmap(FIX_PARAVIRT_BOOTMAP, |
| 843 | xen_start_info->shared_info); |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 844 | |
Jeremy Fitzhardinge | 15664f9 | 2008-07-08 15:06:47 -0700 | [diff] [blame] | 845 | HYPERVISOR_shared_info = |
| 846 | (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP); |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 847 | } else |
| 848 | HYPERVISOR_shared_info = |
| 849 | (struct shared_info *)__va(xen_start_info->shared_info); |
| 850 | |
| 851 | #ifndef CONFIG_SMP |
| 852 | /* In UP this is as good a place as any to set up shared info */ |
| 853 | xen_setup_vcpu_info_placement(); |
| 854 | #endif |
Jeremy Fitzhardinge | d5edbc1 | 2008-05-26 23:31:22 +0100 | [diff] [blame] | 855 | |
| 856 | xen_setup_mfn_list_list(); |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 857 | } |
| 858 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 859 | /* This is called once we have the cpu_possible_map */ |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 860 | void xen_setup_vcpu_info_placement(void) |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 861 | { |
| 862 | int cpu; |
| 863 | |
| 864 | for_each_possible_cpu(cpu) |
| 865 | xen_vcpu_setup(cpu); |
| 866 | |
| 867 | /* xen_vcpu_setup managed to place the vcpu_info within the |
| 868 | percpu area for all cpus, so make use of it */ |
| 869 | if (have_vcpu_info_placement) { |
Jeremy Fitzhardinge | ecb93d1 | 2009-01-28 14:35:05 -0800 | [diff] [blame] | 870 | pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct); |
| 871 | pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct); |
| 872 | pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct); |
| 873 | pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct); |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 874 | pv_mmu_ops.read_cr2 = xen_read_cr2_direct; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 875 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 876 | } |
| 877 | |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 878 | static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, |
| 879 | unsigned long addr, unsigned len) |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 880 | { |
| 881 | char *start, *end, *reloc; |
| 882 | unsigned ret; |
| 883 | |
| 884 | start = end = reloc = NULL; |
| 885 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 886 | #define SITE(op, x) \ |
| 887 | case PARAVIRT_PATCH(op.x): \ |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 888 | if (have_vcpu_info_placement) { \ |
| 889 | start = (char *)xen_##x##_direct; \ |
| 890 | end = xen_##x##_direct_end; \ |
| 891 | reloc = xen_##x##_direct_reloc; \ |
| 892 | } \ |
| 893 | goto patch_site |
| 894 | |
| 895 | switch (type) { |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 896 | SITE(pv_irq_ops, irq_enable); |
| 897 | SITE(pv_irq_ops, irq_disable); |
| 898 | SITE(pv_irq_ops, save_fl); |
| 899 | SITE(pv_irq_ops, restore_fl); |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 900 | #undef SITE |
| 901 | |
| 902 | patch_site: |
| 903 | if (start == NULL || (end-start) > len) |
| 904 | goto default_patch; |
| 905 | |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 906 | ret = paravirt_patch_insns(insnbuf, len, start, end); |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 907 | |
| 908 | /* Note: because reloc is assigned from something that |
| 909 | appears to be an array, gcc assumes it's non-null, |
| 910 | but doesn't know its relationship with start and |
| 911 | end. */ |
| 912 | if (reloc > start && reloc < end) { |
| 913 | int reloc_off = reloc - start; |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 914 | long *relocp = (long *)(insnbuf + reloc_off); |
| 915 | long delta = start - (char *)addr; |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 916 | |
| 917 | *relocp += delta; |
| 918 | } |
| 919 | break; |
| 920 | |
| 921 | default_patch: |
| 922 | default: |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 923 | ret = paravirt_patch_default(type, clobbers, insnbuf, |
| 924 | addr, len); |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 925 | break; |
| 926 | } |
| 927 | |
| 928 | return ret; |
| 929 | } |
| 930 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 931 | static const struct pv_info xen_info __initdata = { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 932 | .paravirt_enabled = 1, |
| 933 | .shared_kernel_pmd = 0, |
| 934 | |
| 935 | .name = "Xen", |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 936 | }; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 937 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 938 | static const struct pv_init_ops xen_init_ops __initdata = { |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 939 | .patch = xen_patch, |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 940 | }; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 941 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 942 | static const struct pv_cpu_ops xen_cpu_ops __initdata = { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 943 | .cpuid = xen_cpuid, |
| 944 | |
| 945 | .set_debugreg = xen_set_debugreg, |
| 946 | .get_debugreg = xen_get_debugreg, |
| 947 | |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 948 | .clts = xen_clts, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 949 | |
Jeremy Fitzhardinge | a789ed5 | 2009-04-24 00:26:50 -0700 | [diff] [blame] | 950 | .read_cr0 = xen_read_cr0, |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 951 | .write_cr0 = xen_write_cr0, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 952 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 953 | .read_cr4 = native_read_cr4, |
| 954 | .read_cr4_safe = native_read_cr4_safe, |
| 955 | .write_cr4 = xen_write_cr4, |
| 956 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 957 | .wbinvd = native_wbinvd, |
| 958 | |
| 959 | .read_msr = native_read_msr_safe, |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 960 | .write_msr = xen_write_msr_safe, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 961 | .read_tsc = native_read_tsc, |
| 962 | .read_pmc = native_read_pmc, |
| 963 | |
Jeremy Fitzhardinge | 81e103f | 2008-04-17 17:40:51 +0200 | [diff] [blame] | 964 | .iret = xen_iret, |
Jeremy Fitzhardinge | d75cd22f | 2008-06-25 00:19:26 -0400 | [diff] [blame] | 965 | .irq_enable_sysexit = xen_sysexit, |
Jeremy Fitzhardinge | 6fcac6d | 2008-07-08 15:07:14 -0700 | [diff] [blame] | 966 | #ifdef CONFIG_X86_64 |
| 967 | .usergs_sysret32 = xen_sysret32, |
| 968 | .usergs_sysret64 = xen_sysret64, |
| 969 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 970 | |
| 971 | .load_tr_desc = paravirt_nop, |
| 972 | .set_ldt = xen_set_ldt, |
| 973 | .load_gdt = xen_load_gdt, |
| 974 | .load_idt = xen_load_idt, |
| 975 | .load_tls = xen_load_tls, |
Eduardo Habkost | a8fc108 | 2008-07-08 15:07:05 -0700 | [diff] [blame] | 976 | #ifdef CONFIG_X86_64 |
| 977 | .load_gs_index = xen_load_gs_index, |
| 978 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 979 | |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 980 | .alloc_ldt = xen_alloc_ldt, |
| 981 | .free_ldt = xen_free_ldt, |
| 982 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 983 | .store_gdt = native_store_gdt, |
| 984 | .store_idt = native_store_idt, |
| 985 | .store_tr = xen_store_tr, |
| 986 | |
| 987 | .write_ldt_entry = xen_write_ldt_entry, |
| 988 | .write_gdt_entry = xen_write_gdt_entry, |
| 989 | .write_idt_entry = xen_write_idt_entry, |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 990 | .load_sp0 = xen_load_sp0, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 991 | |
| 992 | .set_iopl_mask = xen_set_iopl_mask, |
| 993 | .io_delay = xen_io_delay, |
| 994 | |
Jeremy Fitzhardinge | 952d1d7 | 2008-07-08 15:07:01 -0700 | [diff] [blame] | 995 | /* Xen takes care of %gs when switching to usermode for us */ |
| 996 | .swapgs = paravirt_nop, |
| 997 | |
Jeremy Fitzhardinge | 224101e | 2009-02-18 11:18:57 -0800 | [diff] [blame] | 998 | .start_context_switch = paravirt_start_context_switch, |
| 999 | .end_context_switch = xen_end_context_switch, |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1000 | }; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1001 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1002 | static const struct pv_apic_ops xen_apic_ops __initdata = { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1003 | #ifdef CONFIG_X86_LOCAL_APIC |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1004 | .startup_ipi_hook = paravirt_nop, |
| 1005 | #endif |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1006 | }; |
| 1007 | |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1008 | static void xen_reboot(int reason) |
| 1009 | { |
Jeremy Fitzhardinge | 349c709 | 2008-05-26 23:31:02 +0100 | [diff] [blame] | 1010 | struct sched_shutdown r = { .reason = reason }; |
| 1011 | |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1012 | #ifdef CONFIG_SMP |
| 1013 | smp_send_stop(); |
| 1014 | #endif |
| 1015 | |
Jeremy Fitzhardinge | 349c709 | 2008-05-26 23:31:02 +0100 | [diff] [blame] | 1016 | if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r)) |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1017 | BUG(); |
| 1018 | } |
| 1019 | |
| 1020 | static void xen_restart(char *msg) |
| 1021 | { |
| 1022 | xen_reboot(SHUTDOWN_reboot); |
| 1023 | } |
| 1024 | |
| 1025 | static void xen_emergency_restart(void) |
| 1026 | { |
| 1027 | xen_reboot(SHUTDOWN_reboot); |
| 1028 | } |
| 1029 | |
| 1030 | static void xen_machine_halt(void) |
| 1031 | { |
| 1032 | xen_reboot(SHUTDOWN_poweroff); |
| 1033 | } |
| 1034 | |
| 1035 | static void xen_crash_shutdown(struct pt_regs *regs) |
| 1036 | { |
| 1037 | xen_reboot(SHUTDOWN_crash); |
| 1038 | } |
| 1039 | |
Donald Dutile | f09f6d1 | 2010-07-15 14:56:49 -0400 | [diff] [blame] | 1040 | static int |
| 1041 | xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1042 | { |
Ian Campbell | 086748e | 2010-08-03 14:55:14 -0700 | [diff] [blame] | 1043 | xen_reboot(SHUTDOWN_crash); |
Donald Dutile | f09f6d1 | 2010-07-15 14:56:49 -0400 | [diff] [blame] | 1044 | return NOTIFY_DONE; |
| 1045 | } |
| 1046 | |
| 1047 | static struct notifier_block xen_panic_block = { |
| 1048 | .notifier_call= xen_panic_event, |
| 1049 | }; |
| 1050 | |
| 1051 | int xen_panic_handler_init(void) |
| 1052 | { |
| 1053 | atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block); |
| 1054 | return 0; |
| 1055 | } |
| 1056 | |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1057 | static const struct machine_ops __initdata xen_machine_ops = { |
| 1058 | .restart = xen_restart, |
| 1059 | .halt = xen_machine_halt, |
| 1060 | .power_off = xen_machine_halt, |
| 1061 | .shutdown = xen_machine_halt, |
| 1062 | .crash_shutdown = xen_crash_shutdown, |
| 1063 | .emergency_restart = xen_emergency_restart, |
| 1064 | }; |
| 1065 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1066 | /* |
| 1067 | * Set up the GDT and segment registers for -fstack-protector. Until |
| 1068 | * we do this, we have to be careful not to call any stack-protected |
| 1069 | * function, which is most of the kernel. |
| 1070 | */ |
| 1071 | static void __init xen_setup_stackprotector(void) |
| 1072 | { |
| 1073 | pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot; |
| 1074 | pv_cpu_ops.load_gdt = xen_load_gdt_boot; |
| 1075 | |
| 1076 | setup_stack_canary_segment(0); |
| 1077 | switch_to_new_gdt(0); |
| 1078 | |
| 1079 | pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry; |
| 1080 | pv_cpu_ops.load_gdt = xen_load_gdt; |
| 1081 | } |
| 1082 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1083 | /* First C function to be called on Xen boot */ |
| 1084 | asmlinkage void __init xen_start_kernel(void) |
| 1085 | { |
| 1086 | pgd_t *pgd; |
| 1087 | |
| 1088 | if (!xen_start_info) |
| 1089 | return; |
| 1090 | |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 1091 | xen_domain_type = XEN_PV_DOMAIN; |
| 1092 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1093 | /* Install Xen paravirt ops */ |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1094 | pv_info = xen_info; |
| 1095 | pv_init_ops = xen_init_ops; |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1096 | pv_cpu_ops = xen_cpu_ops; |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1097 | pv_apic_ops = xen_apic_ops; |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1098 | |
Thomas Gleixner | 6b18ae3 | 2009-08-20 10:19:54 +0200 | [diff] [blame] | 1099 | x86_init.resources.memory_setup = xen_memory_setup; |
Thomas Gleixner | 42bbdb4 | 2009-08-20 13:04:10 +0200 | [diff] [blame] | 1100 | x86_init.oem.arch_setup = xen_arch_setup; |
Thomas Gleixner | 6f30c1a | 2009-08-20 13:19:57 +0200 | [diff] [blame] | 1101 | x86_init.oem.banner = xen_banner; |
Thomas Gleixner | 845b394 | 2009-08-19 15:37:03 +0200 | [diff] [blame] | 1102 | |
Stefano Stabellini | 409771d | 2010-05-14 12:48:19 +0100 | [diff] [blame] | 1103 | xen_init_time_ops(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1104 | |
Jeremy Fitzhardinge | ce2eef3 | 2009-08-17 12:26:53 -0700 | [diff] [blame] | 1105 | /* |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1106 | * Set up some pagetable state before starting to set any ptes. |
Jeremy Fitzhardinge | ce2eef3 | 2009-08-17 12:26:53 -0700 | [diff] [blame] | 1107 | */ |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1108 | |
Jeremy Fitzhardinge | 973df35 | 2009-10-27 16:54:19 -0700 | [diff] [blame] | 1109 | xen_init_mmu_ops(); |
| 1110 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1111 | /* Prevent unwanted bits from being set in PTEs. */ |
| 1112 | __supported_pte_mask &= ~_PAGE_GLOBAL; |
| 1113 | if (!xen_initial_domain()) |
| 1114 | __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD); |
| 1115 | |
| 1116 | __supported_pte_mask |= _PAGE_IOMAP; |
| 1117 | |
Ian Campbell | 817a824 | 2010-02-26 17:16:00 +0000 | [diff] [blame] | 1118 | /* |
| 1119 | * Prevent page tables from being allocated in highmem, even |
| 1120 | * if CONFIG_HIGHPTE is enabled. |
| 1121 | */ |
| 1122 | __userpte_alloc_gfp &= ~__GFP_HIGHMEM; |
| 1123 | |
Jeremy Fitzhardinge | b75fe4e | 2009-09-21 13:34:06 -0700 | [diff] [blame] | 1124 | /* Work out if we support NX */ |
H. Peter Anvin | 4763ed4 | 2009-11-13 15:28:16 -0800 | [diff] [blame] | 1125 | x86_configure_nx(); |
Jeremy Fitzhardinge | b75fe4e | 2009-09-21 13:34:06 -0700 | [diff] [blame] | 1126 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1127 | xen_setup_features(); |
| 1128 | |
| 1129 | /* Get mfn list */ |
| 1130 | if (!xen_feature(XENFEAT_auto_translated_physmap)) |
| 1131 | xen_build_dynamic_phys_to_machine(); |
| 1132 | |
| 1133 | /* |
| 1134 | * Set up kernel GDT and segment registers, mainly so that |
| 1135 | * -fstack-protector code can be executed. |
| 1136 | */ |
| 1137 | xen_setup_stackprotector(); |
Jeremy Fitzhardinge | 0d1edf4 | 2008-07-28 11:53:57 -0700 | [diff] [blame] | 1138 | |
Jeremy Fitzhardinge | ce2eef3 | 2009-08-17 12:26:53 -0700 | [diff] [blame] | 1139 | xen_init_irq_ops(); |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 1140 | xen_init_cpuid_mask(); |
| 1141 | |
Yinghai Lu | 94a8c3c | 2008-07-13 22:19:35 -0700 | [diff] [blame] | 1142 | #ifdef CONFIG_X86_LOCAL_APIC |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 1143 | /* |
Yinghai Lu | 94a8c3c | 2008-07-13 22:19:35 -0700 | [diff] [blame] | 1144 | * set up the basic apic ops. |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 1145 | */ |
Yinghai Lu | c1eeb2d | 2009-02-16 23:02:14 -0800 | [diff] [blame] | 1146 | set_xen_basic_apic_ops(); |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 1147 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1148 | |
Jeremy Fitzhardinge | e57778a | 2008-06-16 04:30:02 -0700 | [diff] [blame] | 1149 | if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) { |
| 1150 | pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start; |
| 1151 | pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit; |
| 1152 | } |
| 1153 | |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1154 | machine_ops = xen_machine_ops; |
| 1155 | |
Jeremy Fitzhardinge | 3834143 | 2009-02-02 13:55:31 -0800 | [diff] [blame] | 1156 | /* |
| 1157 | * The only reliable way to retain the initial address of the |
| 1158 | * percpu gdt_page is to remember it here, so we can go and |
| 1159 | * mark it RW later, when the initial percpu area is freed. |
| 1160 | */ |
| 1161 | xen_initial_gdt = &per_cpu(gdt_page, 0); |
Jeremy Fitzhardinge | 795f99b | 2009-01-30 17:47:54 +0900 | [diff] [blame] | 1162 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 1163 | xen_smp_init(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1164 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1165 | pgd = (pgd_t *)xen_start_info->pt_base; |
| 1166 | |
Alex Nixon | 7347b40 | 2010-02-19 13:31:06 -0500 | [diff] [blame] | 1167 | if (!xen_initial_domain()) |
| 1168 | __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD); |
| 1169 | |
| 1170 | __supported_pte_mask |= _PAGE_IOMAP; |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1171 | /* Don't do the full vcpu_info placement stuff until we have a |
| 1172 | possible map and a non-dummy shared_info. */ |
| 1173 | per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; |
| 1174 | |
Jeremy Fitzhardinge | 55d8085 | 2009-02-25 09:42:25 -0800 | [diff] [blame] | 1175 | local_irq_disable(); |
| 1176 | early_boot_irqs_off(); |
| 1177 | |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1178 | xen_raw_console_write("mapping kernel into physical memory\n"); |
Jeremy Fitzhardinge | d114e198 | 2008-07-08 15:06:52 -0700 | [diff] [blame] | 1179 | pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages); |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1180 | |
Jeremy Fitzhardinge | 33a8475 | 2010-08-27 15:18:19 -0700 | [diff] [blame^] | 1181 | /* Allocate and initialize top and mid mfn levels for p2m structure */ |
| 1182 | xen_build_mfn_list_list(); |
| 1183 | |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1184 | init_mm.pgd = pgd; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1185 | |
| 1186 | /* keep using Xen gdt for now; no urgent need to change it */ |
| 1187 | |
Ian Campbell | e68266b | 2010-01-13 10:16:08 +0000 | [diff] [blame] | 1188 | #ifdef CONFIG_X86_32 |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1189 | pv_info.kernel_rpl = 1; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1190 | if (xen_feature(XENFEAT_supervisor_mode_kernel)) |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1191 | pv_info.kernel_rpl = 0; |
Ian Campbell | e68266b | 2010-01-13 10:16:08 +0000 | [diff] [blame] | 1192 | #else |
| 1193 | pv_info.kernel_rpl = 0; |
| 1194 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1195 | |
| 1196 | /* set the limit of our address space */ |
Jeremy Fitzhardinge | fb1d840 | 2007-10-16 11:51:31 -0700 | [diff] [blame] | 1197 | xen_reserve_top(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1198 | |
Jeremy Fitzhardinge | 7d087b6 | 2008-07-08 15:06:48 -0700 | [diff] [blame] | 1199 | #ifdef CONFIG_X86_32 |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1200 | /* set up basic CPUID stuff */ |
| 1201 | cpu_detect(&new_cpu_data); |
| 1202 | new_cpu_data.hard_math = 1; |
Jeremy Fitzhardinge | d560bc6 | 2009-08-25 12:53:02 -0700 | [diff] [blame] | 1203 | new_cpu_data.wp_works_ok = 1; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1204 | new_cpu_data.x86_capability[0] = cpuid_edx(1); |
Jeremy Fitzhardinge | 7d087b6 | 2008-07-08 15:06:48 -0700 | [diff] [blame] | 1205 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1206 | |
| 1207 | /* Poke various useful things into boot_params */ |
H. Peter Anvin | 30c8264 | 2007-10-15 17:13:22 -0700 | [diff] [blame] | 1208 | boot_params.hdr.type_of_loader = (9 << 4) | 0; |
| 1209 | boot_params.hdr.ramdisk_image = xen_start_info->mod_start |
| 1210 | ? __pa(xen_start_info->mod_start) : 0; |
| 1211 | boot_params.hdr.ramdisk_size = xen_start_info->mod_len; |
Jeremy Fitzhardinge | b7c3c5c | 2008-07-08 15:07:07 -0700 | [diff] [blame] | 1212 | boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1213 | |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 1214 | if (!xen_initial_domain()) { |
Jeremy Fitzhardinge | 83abc70 | 2008-05-26 23:31:12 +0100 | [diff] [blame] | 1215 | add_preferred_console("xenboot", 0, NULL); |
Markus Armbruster | 9e124fe | 2008-05-26 23:31:07 +0100 | [diff] [blame] | 1216 | add_preferred_console("tty", 0, NULL); |
Markus Armbruster | b8c2d3d | 2008-02-27 14:56:35 +0100 | [diff] [blame] | 1217 | add_preferred_console("hvc", 0, NULL); |
Chris Wright | 5d990b6 | 2009-12-04 12:15:21 -0800 | [diff] [blame] | 1218 | } else { |
| 1219 | /* Make sure ACS will be enabled */ |
| 1220 | pci_request_acs(); |
Markus Armbruster | 9e124fe | 2008-05-26 23:31:07 +0100 | [diff] [blame] | 1221 | } |
Chris Wright | 5d990b6 | 2009-12-04 12:15:21 -0800 | [diff] [blame] | 1222 | |
Markus Armbruster | b8c2d3d | 2008-02-27 14:56:35 +0100 | [diff] [blame] | 1223 | |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1224 | xen_raw_console_write("about to get started...\n"); |
| 1225 | |
Jeremy Fitzhardinge | 499d19b | 2009-11-24 09:38:25 -0800 | [diff] [blame] | 1226 | xen_setup_runstate_info(0); |
| 1227 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1228 | /* Start the world */ |
Jeremy Fitzhardinge | f5d36de | 2008-07-08 15:06:39 -0700 | [diff] [blame] | 1229 | #ifdef CONFIG_X86_32 |
Yinghai Lu | f0d4310 | 2008-05-29 12:56:36 -0700 | [diff] [blame] | 1230 | i386_start_kernel(); |
Jeremy Fitzhardinge | f5d36de | 2008-07-08 15:06:39 -0700 | [diff] [blame] | 1231 | #else |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1232 | x86_64_start_reservations((char *)__pa_symbol(&boot_params)); |
Jeremy Fitzhardinge | f5d36de | 2008-07-08 15:06:39 -0700 | [diff] [blame] | 1233 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1234 | } |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1235 | |
| 1236 | static uint32_t xen_cpuid_base(void) |
| 1237 | { |
| 1238 | uint32_t base, eax, ebx, ecx, edx; |
| 1239 | char signature[13]; |
| 1240 | |
| 1241 | for (base = 0x40000000; base < 0x40010000; base += 0x100) { |
| 1242 | cpuid(base, &eax, &ebx, &ecx, &edx); |
| 1243 | *(uint32_t *)(signature + 0) = ebx; |
| 1244 | *(uint32_t *)(signature + 4) = ecx; |
| 1245 | *(uint32_t *)(signature + 8) = edx; |
| 1246 | signature[12] = 0; |
| 1247 | |
| 1248 | if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2)) |
| 1249 | return base; |
| 1250 | } |
| 1251 | |
| 1252 | return 0; |
| 1253 | } |
| 1254 | |
| 1255 | static int init_hvm_pv_info(int *major, int *minor) |
| 1256 | { |
| 1257 | uint32_t eax, ebx, ecx, edx, pages, msr, base; |
| 1258 | u64 pfn; |
| 1259 | |
| 1260 | base = xen_cpuid_base(); |
| 1261 | cpuid(base + 1, &eax, &ebx, &ecx, &edx); |
| 1262 | |
| 1263 | *major = eax >> 16; |
| 1264 | *minor = eax & 0xffff; |
| 1265 | printk(KERN_INFO "Xen version %d.%d.\n", *major, *minor); |
| 1266 | |
| 1267 | cpuid(base + 2, &pages, &msr, &ecx, &edx); |
| 1268 | |
| 1269 | pfn = __pa(hypercall_page); |
| 1270 | wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32)); |
| 1271 | |
| 1272 | xen_setup_features(); |
| 1273 | |
| 1274 | pv_info = xen_info; |
| 1275 | pv_info.kernel_rpl = 0; |
| 1276 | |
| 1277 | xen_domain_type = XEN_HVM_DOMAIN; |
| 1278 | |
| 1279 | return 0; |
| 1280 | } |
| 1281 | |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 1282 | void xen_hvm_init_shared_info(void) |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1283 | { |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 1284 | int cpu; |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1285 | struct xen_add_to_physmap xatp; |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 1286 | static struct shared_info *shared_info_page = 0; |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1287 | |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 1288 | if (!shared_info_page) |
| 1289 | shared_info_page = (struct shared_info *) |
| 1290 | extend_brk(PAGE_SIZE, PAGE_SIZE); |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1291 | xatp.domid = DOMID_SELF; |
| 1292 | xatp.idx = 0; |
| 1293 | xatp.space = XENMAPSPACE_shared_info; |
| 1294 | xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT; |
| 1295 | if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) |
| 1296 | BUG(); |
| 1297 | |
| 1298 | HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; |
| 1299 | |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 1300 | /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info |
| 1301 | * page, we use it in the event channel upcall and in some pvclock |
| 1302 | * related functions. We don't need the vcpu_info placement |
| 1303 | * optimizations because we don't use any pv_mmu or pv_irq op on |
| 1304 | * HVM. |
| 1305 | * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is |
| 1306 | * online but xen_hvm_init_shared_info is run at resume time too and |
| 1307 | * in that case multiple vcpus might be online. */ |
| 1308 | for_each_online_cpu(cpu) { |
| 1309 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
| 1310 | } |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1311 | } |
| 1312 | |
Stefano Stabellini | ca65f9f | 2010-07-29 14:37:48 +0100 | [diff] [blame] | 1313 | #ifdef CONFIG_XEN_PVHVM |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1314 | static int __cpuinit xen_hvm_cpu_notify(struct notifier_block *self, |
| 1315 | unsigned long action, void *hcpu) |
| 1316 | { |
| 1317 | int cpu = (long)hcpu; |
| 1318 | switch (action) { |
| 1319 | case CPU_UP_PREPARE: |
| 1320 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
| 1321 | break; |
| 1322 | default: |
| 1323 | break; |
| 1324 | } |
| 1325 | return NOTIFY_OK; |
| 1326 | } |
| 1327 | |
| 1328 | static struct notifier_block __cpuinitdata xen_hvm_cpu_notifier = { |
| 1329 | .notifier_call = xen_hvm_cpu_notify, |
| 1330 | }; |
| 1331 | |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1332 | static void __init xen_hvm_guest_init(void) |
| 1333 | { |
| 1334 | int r; |
| 1335 | int major, minor; |
| 1336 | |
| 1337 | r = init_hvm_pv_info(&major, &minor); |
| 1338 | if (r < 0) |
| 1339 | return; |
| 1340 | |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 1341 | xen_hvm_init_shared_info(); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1342 | |
| 1343 | if (xen_feature(XENFEAT_hvm_callback_vector)) |
| 1344 | xen_have_vector_callback = 1; |
| 1345 | register_cpu_notifier(&xen_hvm_cpu_notifier); |
Stefano Stabellini | c1c5413 | 2010-05-14 12:44:30 +0100 | [diff] [blame] | 1346 | xen_unplug_emulated_devices(); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1347 | have_vcpu_info_placement = 0; |
| 1348 | x86_init.irqs.intr_init = xen_init_IRQ; |
Stefano Stabellini | 409771d | 2010-05-14 12:48:19 +0100 | [diff] [blame] | 1349 | xen_hvm_init_time_ops(); |
Stefano Stabellini | 5915100 | 2010-06-17 14:22:52 +0100 | [diff] [blame] | 1350 | xen_hvm_init_mmu_ops(); |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1351 | } |
| 1352 | |
| 1353 | static bool __init xen_hvm_platform(void) |
| 1354 | { |
| 1355 | if (xen_pv_domain()) |
| 1356 | return false; |
| 1357 | |
| 1358 | if (!xen_cpuid_base()) |
| 1359 | return false; |
| 1360 | |
| 1361 | return true; |
| 1362 | } |
| 1363 | |
| 1364 | const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = { |
| 1365 | .name = "Xen HVM", |
| 1366 | .detect = xen_hvm_platform, |
| 1367 | .init_platform = xen_hvm_guest_init, |
| 1368 | }; |
| 1369 | EXPORT_SYMBOL(x86_hyper_xen_hvm); |
Stefano Stabellini | ca65f9f | 2010-07-29 14:37:48 +0100 | [diff] [blame] | 1370 | #endif |