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. |
| 8 | * |
| 9 | * Authors: |
| 10 | * Avi Kivity <avi@qumranet.com> |
| 11 | * Yaniv Kamay <yaniv@qumranet.com> |
| 12 | * |
| 13 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 14 | * the COPYING file in the top-level directory. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | #include "kvm.h" |
| 19 | #include "vmx.h" |
| 20 | #include "kvm_vmx.h" |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/highmem.h> |
| 24 | #include <asm/io.h> |
Anthony Liguori | 3b3be0d | 2006-12-13 00:33:43 -0800 | [diff] [blame] | 25 | #include <asm/desc.h> |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 26 | |
| 27 | #include "segment_descriptor.h" |
| 28 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 29 | |
| 30 | MODULE_AUTHOR("Qumranet"); |
| 31 | MODULE_LICENSE("GPL"); |
| 32 | |
| 33 | static DEFINE_PER_CPU(struct vmcs *, vmxarea); |
| 34 | static DEFINE_PER_CPU(struct vmcs *, current_vmcs); |
| 35 | |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 36 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 37 | #define HOST_IS_64 1 |
| 38 | #else |
| 39 | #define HOST_IS_64 0 |
| 40 | #endif |
| 41 | |
| 42 | static struct vmcs_descriptor { |
| 43 | int size; |
| 44 | int order; |
| 45 | u32 revision_id; |
| 46 | } vmcs_descriptor; |
| 47 | |
| 48 | #define VMX_SEGMENT_FIELD(seg) \ |
| 49 | [VCPU_SREG_##seg] = { \ |
| 50 | .selector = GUEST_##seg##_SELECTOR, \ |
| 51 | .base = GUEST_##seg##_BASE, \ |
| 52 | .limit = GUEST_##seg##_LIMIT, \ |
| 53 | .ar_bytes = GUEST_##seg##_AR_BYTES, \ |
| 54 | } |
| 55 | |
| 56 | static struct kvm_vmx_segment_field { |
| 57 | unsigned selector; |
| 58 | unsigned base; |
| 59 | unsigned limit; |
| 60 | unsigned ar_bytes; |
| 61 | } kvm_vmx_segment_fields[] = { |
| 62 | VMX_SEGMENT_FIELD(CS), |
| 63 | VMX_SEGMENT_FIELD(DS), |
| 64 | VMX_SEGMENT_FIELD(ES), |
| 65 | VMX_SEGMENT_FIELD(FS), |
| 66 | VMX_SEGMENT_FIELD(GS), |
| 67 | VMX_SEGMENT_FIELD(SS), |
| 68 | VMX_SEGMENT_FIELD(TR), |
| 69 | VMX_SEGMENT_FIELD(LDTR), |
| 70 | }; |
| 71 | |
| 72 | static const u32 vmx_msr_index[] = { |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 73 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 74 | MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE, |
| 75 | #endif |
| 76 | MSR_EFER, MSR_K6_STAR, |
| 77 | }; |
| 78 | #define NR_VMX_MSR (sizeof(vmx_msr_index) / sizeof(*vmx_msr_index)) |
| 79 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 80 | static inline int is_page_fault(u32 intr_info) |
| 81 | { |
| 82 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | |
| 83 | INTR_INFO_VALID_MASK)) == |
| 84 | (INTR_TYPE_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK); |
| 85 | } |
| 86 | |
| 87 | static inline int is_external_interrupt(u32 intr_info) |
| 88 | { |
| 89 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK)) |
| 90 | == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK); |
| 91 | } |
| 92 | |
Avi Kivity | 7725f0b | 2006-12-13 00:34:01 -0800 | [diff] [blame] | 93 | static struct vmx_msr_entry *find_msr_entry(struct kvm_vcpu *vcpu, u32 msr) |
| 94 | { |
| 95 | int i; |
| 96 | |
| 97 | for (i = 0; i < vcpu->nmsrs; ++i) |
| 98 | if (vcpu->guest_msrs[i].index == msr) |
| 99 | return &vcpu->guest_msrs[i]; |
| 100 | return 0; |
| 101 | } |
| 102 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 103 | static void vmcs_clear(struct vmcs *vmcs) |
| 104 | { |
| 105 | u64 phys_addr = __pa(vmcs); |
| 106 | u8 error; |
| 107 | |
| 108 | asm volatile (ASM_VMX_VMCLEAR_RAX "; setna %0" |
| 109 | : "=g"(error) : "a"(&phys_addr), "m"(phys_addr) |
| 110 | : "cc", "memory"); |
| 111 | if (error) |
| 112 | printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n", |
| 113 | vmcs, phys_addr); |
| 114 | } |
| 115 | |
| 116 | static void __vcpu_clear(void *arg) |
| 117 | { |
| 118 | struct kvm_vcpu *vcpu = arg; |
Ingo Molnar | d3b2c33 | 2007-01-05 16:36:23 -0800 | [diff] [blame] | 119 | int cpu = raw_smp_processor_id(); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 120 | |
| 121 | if (vcpu->cpu == cpu) |
| 122 | vmcs_clear(vcpu->vmcs); |
| 123 | if (per_cpu(current_vmcs, cpu) == vcpu->vmcs) |
| 124 | per_cpu(current_vmcs, cpu) = NULL; |
| 125 | } |
| 126 | |
| 127 | static unsigned long vmcs_readl(unsigned long field) |
| 128 | { |
| 129 | unsigned long value; |
| 130 | |
| 131 | asm volatile (ASM_VMX_VMREAD_RDX_RAX |
| 132 | : "=a"(value) : "d"(field) : "cc"); |
| 133 | return value; |
| 134 | } |
| 135 | |
| 136 | static u16 vmcs_read16(unsigned long field) |
| 137 | { |
| 138 | return vmcs_readl(field); |
| 139 | } |
| 140 | |
| 141 | static u32 vmcs_read32(unsigned long field) |
| 142 | { |
| 143 | return vmcs_readl(field); |
| 144 | } |
| 145 | |
| 146 | static u64 vmcs_read64(unsigned long field) |
| 147 | { |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 148 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 149 | return vmcs_readl(field); |
| 150 | #else |
| 151 | return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32); |
| 152 | #endif |
| 153 | } |
| 154 | |
| 155 | static void vmcs_writel(unsigned long field, unsigned long value) |
| 156 | { |
| 157 | u8 error; |
| 158 | |
| 159 | asm volatile (ASM_VMX_VMWRITE_RAX_RDX "; setna %0" |
| 160 | : "=q"(error) : "a"(value), "d"(field) : "cc" ); |
| 161 | if (error) |
| 162 | printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n", |
| 163 | field, value, vmcs_read32(VM_INSTRUCTION_ERROR)); |
| 164 | } |
| 165 | |
| 166 | static void vmcs_write16(unsigned long field, u16 value) |
| 167 | { |
| 168 | vmcs_writel(field, value); |
| 169 | } |
| 170 | |
| 171 | static void vmcs_write32(unsigned long field, u32 value) |
| 172 | { |
| 173 | vmcs_writel(field, value); |
| 174 | } |
| 175 | |
| 176 | static void vmcs_write64(unsigned long field, u64 value) |
| 177 | { |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 178 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 179 | vmcs_writel(field, value); |
| 180 | #else |
| 181 | vmcs_writel(field, value); |
| 182 | asm volatile (""); |
| 183 | vmcs_writel(field+1, value >> 32); |
| 184 | #endif |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * Switches to specified vcpu, until a matching vcpu_put(), but assumes |
| 189 | * vcpu mutex is already taken. |
| 190 | */ |
| 191 | static struct kvm_vcpu *vmx_vcpu_load(struct kvm_vcpu *vcpu) |
| 192 | { |
| 193 | u64 phys_addr = __pa(vcpu->vmcs); |
| 194 | int cpu; |
| 195 | |
| 196 | cpu = get_cpu(); |
| 197 | |
| 198 | if (vcpu->cpu != cpu) { |
| 199 | smp_call_function(__vcpu_clear, vcpu, 0, 1); |
| 200 | vcpu->launched = 0; |
| 201 | } |
| 202 | |
| 203 | if (per_cpu(current_vmcs, cpu) != vcpu->vmcs) { |
| 204 | u8 error; |
| 205 | |
| 206 | per_cpu(current_vmcs, cpu) = vcpu->vmcs; |
| 207 | asm volatile (ASM_VMX_VMPTRLD_RAX "; setna %0" |
| 208 | : "=g"(error) : "a"(&phys_addr), "m"(phys_addr) |
| 209 | : "cc"); |
| 210 | if (error) |
| 211 | printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n", |
| 212 | vcpu->vmcs, phys_addr); |
| 213 | } |
| 214 | |
| 215 | if (vcpu->cpu != cpu) { |
| 216 | struct descriptor_table dt; |
| 217 | unsigned long sysenter_esp; |
| 218 | |
| 219 | vcpu->cpu = cpu; |
| 220 | /* |
| 221 | * Linux uses per-cpu TSS and GDT, so set these when switching |
| 222 | * processors. |
| 223 | */ |
| 224 | vmcs_writel(HOST_TR_BASE, read_tr_base()); /* 22.2.4 */ |
| 225 | get_gdt(&dt); |
| 226 | vmcs_writel(HOST_GDTR_BASE, dt.base); /* 22.2.4 */ |
| 227 | |
| 228 | rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp); |
| 229 | vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */ |
| 230 | } |
| 231 | return vcpu; |
| 232 | } |
| 233 | |
| 234 | static void vmx_vcpu_put(struct kvm_vcpu *vcpu) |
| 235 | { |
| 236 | put_cpu(); |
| 237 | } |
| 238 | |
| 239 | static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu) |
| 240 | { |
| 241 | return vmcs_readl(GUEST_RFLAGS); |
| 242 | } |
| 243 | |
| 244 | static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) |
| 245 | { |
| 246 | vmcs_writel(GUEST_RFLAGS, rflags); |
| 247 | } |
| 248 | |
| 249 | static void skip_emulated_instruction(struct kvm_vcpu *vcpu) |
| 250 | { |
| 251 | unsigned long rip; |
| 252 | u32 interruptibility; |
| 253 | |
| 254 | rip = vmcs_readl(GUEST_RIP); |
| 255 | rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN); |
| 256 | vmcs_writel(GUEST_RIP, rip); |
| 257 | |
| 258 | /* |
| 259 | * We emulated an instruction, so temporary interrupt blocking |
| 260 | * should be removed, if set. |
| 261 | */ |
| 262 | interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); |
| 263 | if (interruptibility & 3) |
| 264 | vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, |
| 265 | interruptibility & ~3); |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 266 | vcpu->interrupt_window_open = 1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | static void vmx_inject_gp(struct kvm_vcpu *vcpu, unsigned error_code) |
| 270 | { |
| 271 | printk(KERN_DEBUG "inject_general_protection: rip 0x%lx\n", |
| 272 | vmcs_readl(GUEST_RIP)); |
| 273 | vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code); |
| 274 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, |
| 275 | GP_VECTOR | |
| 276 | INTR_TYPE_EXCEPTION | |
| 277 | INTR_INFO_DELIEVER_CODE_MASK | |
| 278 | INTR_INFO_VALID_MASK); |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * reads and returns guest's timestamp counter "register" |
| 283 | * guest_tsc = host_tsc + tsc_offset -- 21.3 |
| 284 | */ |
| 285 | static u64 guest_read_tsc(void) |
| 286 | { |
| 287 | u64 host_tsc, tsc_offset; |
| 288 | |
| 289 | rdtscll(host_tsc); |
| 290 | tsc_offset = vmcs_read64(TSC_OFFSET); |
| 291 | return host_tsc + tsc_offset; |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * writes 'guest_tsc' into guest's timestamp counter "register" |
| 296 | * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc |
| 297 | */ |
| 298 | static void guest_write_tsc(u64 guest_tsc) |
| 299 | { |
| 300 | u64 host_tsc; |
| 301 | |
| 302 | rdtscll(host_tsc); |
| 303 | vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc); |
| 304 | } |
| 305 | |
| 306 | static void reload_tss(void) |
| 307 | { |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 308 | #ifndef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 309 | |
| 310 | /* |
| 311 | * VT restores TR but not its size. Useless. |
| 312 | */ |
| 313 | struct descriptor_table gdt; |
| 314 | struct segment_descriptor *descs; |
| 315 | |
| 316 | get_gdt(&gdt); |
| 317 | descs = (void *)gdt.base; |
| 318 | descs[GDT_ENTRY_TSS].type = 9; /* available TSS */ |
| 319 | load_TR_desc(); |
| 320 | #endif |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * Reads an msr value (of 'msr_index') into 'pdata'. |
| 325 | * Returns 0 on success, non-0 otherwise. |
| 326 | * Assumes vcpu_load() was already called. |
| 327 | */ |
| 328 | static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) |
| 329 | { |
| 330 | u64 data; |
| 331 | struct vmx_msr_entry *msr; |
| 332 | |
| 333 | if (!pdata) { |
| 334 | printk(KERN_ERR "BUG: get_msr called with NULL pdata\n"); |
| 335 | return -EINVAL; |
| 336 | } |
| 337 | |
| 338 | switch (msr_index) { |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 339 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 340 | case MSR_FS_BASE: |
| 341 | data = vmcs_readl(GUEST_FS_BASE); |
| 342 | break; |
| 343 | case MSR_GS_BASE: |
| 344 | data = vmcs_readl(GUEST_GS_BASE); |
| 345 | break; |
| 346 | case MSR_EFER: |
Avi Kivity | 3bab1f5 | 2006-12-29 16:49:48 -0800 | [diff] [blame] | 347 | return kvm_get_msr_common(vcpu, msr_index, pdata); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 348 | #endif |
| 349 | case MSR_IA32_TIME_STAMP_COUNTER: |
| 350 | data = guest_read_tsc(); |
| 351 | break; |
| 352 | case MSR_IA32_SYSENTER_CS: |
| 353 | data = vmcs_read32(GUEST_SYSENTER_CS); |
| 354 | break; |
| 355 | case MSR_IA32_SYSENTER_EIP: |
| 356 | data = vmcs_read32(GUEST_SYSENTER_EIP); |
| 357 | break; |
| 358 | case MSR_IA32_SYSENTER_ESP: |
| 359 | data = vmcs_read32(GUEST_SYSENTER_ESP); |
| 360 | break; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 361 | default: |
| 362 | msr = find_msr_entry(vcpu, msr_index); |
Avi Kivity | 3bab1f5 | 2006-12-29 16:49:48 -0800 | [diff] [blame] | 363 | if (msr) { |
| 364 | data = msr->data; |
| 365 | break; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 366 | } |
Avi Kivity | 3bab1f5 | 2006-12-29 16:49:48 -0800 | [diff] [blame] | 367 | return kvm_get_msr_common(vcpu, msr_index, pdata); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | *pdata = data; |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Writes msr value into into the appropriate "register". |
| 376 | * Returns 0 on success, non-0 otherwise. |
| 377 | * Assumes vcpu_load() was already called. |
| 378 | */ |
| 379 | static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) |
| 380 | { |
| 381 | struct vmx_msr_entry *msr; |
| 382 | switch (msr_index) { |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 383 | #ifdef CONFIG_X86_64 |
Avi Kivity | 3bab1f5 | 2006-12-29 16:49:48 -0800 | [diff] [blame] | 384 | case MSR_EFER: |
| 385 | return kvm_set_msr_common(vcpu, msr_index, data); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 386 | case MSR_FS_BASE: |
| 387 | vmcs_writel(GUEST_FS_BASE, data); |
| 388 | break; |
| 389 | case MSR_GS_BASE: |
| 390 | vmcs_writel(GUEST_GS_BASE, data); |
| 391 | break; |
| 392 | #endif |
| 393 | case MSR_IA32_SYSENTER_CS: |
| 394 | vmcs_write32(GUEST_SYSENTER_CS, data); |
| 395 | break; |
| 396 | case MSR_IA32_SYSENTER_EIP: |
| 397 | vmcs_write32(GUEST_SYSENTER_EIP, data); |
| 398 | break; |
| 399 | case MSR_IA32_SYSENTER_ESP: |
| 400 | vmcs_write32(GUEST_SYSENTER_ESP, data); |
| 401 | break; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 402 | case MSR_IA32_TIME_STAMP_COUNTER: { |
| 403 | guest_write_tsc(data); |
| 404 | break; |
| 405 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 406 | default: |
| 407 | msr = find_msr_entry(vcpu, msr_index); |
Avi Kivity | 3bab1f5 | 2006-12-29 16:49:48 -0800 | [diff] [blame] | 408 | if (msr) { |
| 409 | msr->data = data; |
| 410 | break; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 411 | } |
Avi Kivity | 3bab1f5 | 2006-12-29 16:49:48 -0800 | [diff] [blame] | 412 | return kvm_set_msr_common(vcpu, msr_index, data); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 413 | msr->data = data; |
| 414 | break; |
| 415 | } |
| 416 | |
| 417 | return 0; |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * Sync the rsp and rip registers into the vcpu structure. This allows |
| 422 | * registers to be accessed by indexing vcpu->regs. |
| 423 | */ |
| 424 | static void vcpu_load_rsp_rip(struct kvm_vcpu *vcpu) |
| 425 | { |
| 426 | vcpu->regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP); |
| 427 | vcpu->rip = vmcs_readl(GUEST_RIP); |
| 428 | } |
| 429 | |
| 430 | /* |
| 431 | * Syncs rsp and rip back into the vmcs. Should be called after possible |
| 432 | * modification. |
| 433 | */ |
| 434 | static void vcpu_put_rsp_rip(struct kvm_vcpu *vcpu) |
| 435 | { |
| 436 | vmcs_writel(GUEST_RSP, vcpu->regs[VCPU_REGS_RSP]); |
| 437 | vmcs_writel(GUEST_RIP, vcpu->rip); |
| 438 | } |
| 439 | |
| 440 | static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg) |
| 441 | { |
| 442 | unsigned long dr7 = 0x400; |
| 443 | u32 exception_bitmap; |
| 444 | int old_singlestep; |
| 445 | |
| 446 | exception_bitmap = vmcs_read32(EXCEPTION_BITMAP); |
| 447 | old_singlestep = vcpu->guest_debug.singlestep; |
| 448 | |
| 449 | vcpu->guest_debug.enabled = dbg->enabled; |
| 450 | if (vcpu->guest_debug.enabled) { |
| 451 | int i; |
| 452 | |
| 453 | dr7 |= 0x200; /* exact */ |
| 454 | for (i = 0; i < 4; ++i) { |
| 455 | if (!dbg->breakpoints[i].enabled) |
| 456 | continue; |
| 457 | vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address; |
| 458 | dr7 |= 2 << (i*2); /* global enable */ |
| 459 | dr7 |= 0 << (i*4+16); /* execution breakpoint */ |
| 460 | } |
| 461 | |
| 462 | exception_bitmap |= (1u << 1); /* Trap debug exceptions */ |
| 463 | |
| 464 | vcpu->guest_debug.singlestep = dbg->singlestep; |
| 465 | } else { |
| 466 | exception_bitmap &= ~(1u << 1); /* Ignore debug exceptions */ |
| 467 | vcpu->guest_debug.singlestep = 0; |
| 468 | } |
| 469 | |
| 470 | if (old_singlestep && !vcpu->guest_debug.singlestep) { |
| 471 | unsigned long flags; |
| 472 | |
| 473 | flags = vmcs_readl(GUEST_RFLAGS); |
| 474 | flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF); |
| 475 | vmcs_writel(GUEST_RFLAGS, flags); |
| 476 | } |
| 477 | |
| 478 | vmcs_write32(EXCEPTION_BITMAP, exception_bitmap); |
| 479 | vmcs_writel(GUEST_DR7, dr7); |
| 480 | |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | static __init int cpu_has_kvm_support(void) |
| 485 | { |
| 486 | unsigned long ecx = cpuid_ecx(1); |
| 487 | return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */ |
| 488 | } |
| 489 | |
| 490 | static __init int vmx_disabled_by_bios(void) |
| 491 | { |
| 492 | u64 msr; |
| 493 | |
| 494 | rdmsrl(MSR_IA32_FEATURE_CONTROL, msr); |
| 495 | return (msr & 5) == 1; /* locked but not enabled */ |
| 496 | } |
| 497 | |
| 498 | static __init void hardware_enable(void *garbage) |
| 499 | { |
| 500 | int cpu = raw_smp_processor_id(); |
| 501 | u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); |
| 502 | u64 old; |
| 503 | |
| 504 | rdmsrl(MSR_IA32_FEATURE_CONTROL, old); |
Avi Kivity | bfdc0c2 | 2006-12-13 00:34:16 -0800 | [diff] [blame] | 505 | if ((old & 5) != 5) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 506 | /* enable and lock */ |
| 507 | wrmsrl(MSR_IA32_FEATURE_CONTROL, old | 5); |
| 508 | write_cr4(read_cr4() | CR4_VMXE); /* FIXME: not cpu hotplug safe */ |
| 509 | asm volatile (ASM_VMX_VMXON_RAX : : "a"(&phys_addr), "m"(phys_addr) |
| 510 | : "memory", "cc"); |
| 511 | } |
| 512 | |
| 513 | static void hardware_disable(void *garbage) |
| 514 | { |
| 515 | asm volatile (ASM_VMX_VMXOFF : : : "cc"); |
| 516 | } |
| 517 | |
| 518 | static __init void setup_vmcs_descriptor(void) |
| 519 | { |
| 520 | u32 vmx_msr_low, vmx_msr_high; |
| 521 | |
Nguyen Anh Quynh | c68876f | 2006-12-29 16:49:54 -0800 | [diff] [blame] | 522 | rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 523 | vmcs_descriptor.size = vmx_msr_high & 0x1fff; |
| 524 | vmcs_descriptor.order = get_order(vmcs_descriptor.size); |
| 525 | vmcs_descriptor.revision_id = vmx_msr_low; |
Nguyen Anh Quynh | c68876f | 2006-12-29 16:49:54 -0800 | [diff] [blame] | 526 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 527 | |
| 528 | static struct vmcs *alloc_vmcs_cpu(int cpu) |
| 529 | { |
| 530 | int node = cpu_to_node(cpu); |
| 531 | struct page *pages; |
| 532 | struct vmcs *vmcs; |
| 533 | |
| 534 | pages = alloc_pages_node(node, GFP_KERNEL, vmcs_descriptor.order); |
| 535 | if (!pages) |
| 536 | return NULL; |
| 537 | vmcs = page_address(pages); |
| 538 | memset(vmcs, 0, vmcs_descriptor.size); |
| 539 | vmcs->revision_id = vmcs_descriptor.revision_id; /* vmcs revision id */ |
| 540 | return vmcs; |
| 541 | } |
| 542 | |
| 543 | static struct vmcs *alloc_vmcs(void) |
| 544 | { |
Ingo Molnar | d3b2c33 | 2007-01-05 16:36:23 -0800 | [diff] [blame] | 545 | return alloc_vmcs_cpu(raw_smp_processor_id()); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | static void free_vmcs(struct vmcs *vmcs) |
| 549 | { |
| 550 | free_pages((unsigned long)vmcs, vmcs_descriptor.order); |
| 551 | } |
| 552 | |
| 553 | static __exit void free_kvm_area(void) |
| 554 | { |
| 555 | int cpu; |
| 556 | |
| 557 | for_each_online_cpu(cpu) |
| 558 | free_vmcs(per_cpu(vmxarea, cpu)); |
| 559 | } |
| 560 | |
| 561 | extern struct vmcs *alloc_vmcs_cpu(int cpu); |
| 562 | |
| 563 | static __init int alloc_kvm_area(void) |
| 564 | { |
| 565 | int cpu; |
| 566 | |
| 567 | for_each_online_cpu(cpu) { |
| 568 | struct vmcs *vmcs; |
| 569 | |
| 570 | vmcs = alloc_vmcs_cpu(cpu); |
| 571 | if (!vmcs) { |
| 572 | free_kvm_area(); |
| 573 | return -ENOMEM; |
| 574 | } |
| 575 | |
| 576 | per_cpu(vmxarea, cpu) = vmcs; |
| 577 | } |
| 578 | return 0; |
| 579 | } |
| 580 | |
| 581 | static __init int hardware_setup(void) |
| 582 | { |
| 583 | setup_vmcs_descriptor(); |
| 584 | return alloc_kvm_area(); |
| 585 | } |
| 586 | |
| 587 | static __exit void hardware_unsetup(void) |
| 588 | { |
| 589 | free_kvm_area(); |
| 590 | } |
| 591 | |
| 592 | static void update_exception_bitmap(struct kvm_vcpu *vcpu) |
| 593 | { |
| 594 | if (vcpu->rmode.active) |
| 595 | vmcs_write32(EXCEPTION_BITMAP, ~0); |
| 596 | else |
| 597 | vmcs_write32(EXCEPTION_BITMAP, 1 << PF_VECTOR); |
| 598 | } |
| 599 | |
| 600 | static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save) |
| 601 | { |
| 602 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; |
| 603 | |
| 604 | if (vmcs_readl(sf->base) == save->base) { |
| 605 | vmcs_write16(sf->selector, save->selector); |
| 606 | vmcs_writel(sf->base, save->base); |
| 607 | vmcs_write32(sf->limit, save->limit); |
| 608 | vmcs_write32(sf->ar_bytes, save->ar); |
| 609 | } else { |
| 610 | u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK) |
| 611 | << AR_DPL_SHIFT; |
| 612 | vmcs_write32(sf->ar_bytes, 0x93 | dpl); |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | static void enter_pmode(struct kvm_vcpu *vcpu) |
| 617 | { |
| 618 | unsigned long flags; |
| 619 | |
| 620 | vcpu->rmode.active = 0; |
| 621 | |
| 622 | vmcs_writel(GUEST_TR_BASE, vcpu->rmode.tr.base); |
| 623 | vmcs_write32(GUEST_TR_LIMIT, vcpu->rmode.tr.limit); |
| 624 | vmcs_write32(GUEST_TR_AR_BYTES, vcpu->rmode.tr.ar); |
| 625 | |
| 626 | flags = vmcs_readl(GUEST_RFLAGS); |
| 627 | flags &= ~(IOPL_MASK | X86_EFLAGS_VM); |
| 628 | flags |= (vcpu->rmode.save_iopl << IOPL_SHIFT); |
| 629 | vmcs_writel(GUEST_RFLAGS, flags); |
| 630 | |
| 631 | vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~CR4_VME_MASK) | |
| 632 | (vmcs_readl(CR4_READ_SHADOW) & CR4_VME_MASK)); |
| 633 | |
| 634 | update_exception_bitmap(vcpu); |
| 635 | |
| 636 | fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->rmode.es); |
| 637 | fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->rmode.ds); |
| 638 | fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->rmode.gs); |
| 639 | fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->rmode.fs); |
| 640 | |
| 641 | vmcs_write16(GUEST_SS_SELECTOR, 0); |
| 642 | vmcs_write32(GUEST_SS_AR_BYTES, 0x93); |
| 643 | |
| 644 | vmcs_write16(GUEST_CS_SELECTOR, |
| 645 | vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK); |
| 646 | vmcs_write32(GUEST_CS_AR_BYTES, 0x9b); |
| 647 | } |
| 648 | |
| 649 | static int rmode_tss_base(struct kvm* kvm) |
| 650 | { |
| 651 | gfn_t base_gfn = kvm->memslots[0].base_gfn + kvm->memslots[0].npages - 3; |
| 652 | return base_gfn << PAGE_SHIFT; |
| 653 | } |
| 654 | |
| 655 | static void fix_rmode_seg(int seg, struct kvm_save_segment *save) |
| 656 | { |
| 657 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; |
| 658 | |
| 659 | save->selector = vmcs_read16(sf->selector); |
| 660 | save->base = vmcs_readl(sf->base); |
| 661 | save->limit = vmcs_read32(sf->limit); |
| 662 | save->ar = vmcs_read32(sf->ar_bytes); |
| 663 | vmcs_write16(sf->selector, vmcs_readl(sf->base) >> 4); |
| 664 | vmcs_write32(sf->limit, 0xffff); |
| 665 | vmcs_write32(sf->ar_bytes, 0xf3); |
| 666 | } |
| 667 | |
| 668 | static void enter_rmode(struct kvm_vcpu *vcpu) |
| 669 | { |
| 670 | unsigned long flags; |
| 671 | |
| 672 | vcpu->rmode.active = 1; |
| 673 | |
| 674 | vcpu->rmode.tr.base = vmcs_readl(GUEST_TR_BASE); |
| 675 | vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm)); |
| 676 | |
| 677 | vcpu->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT); |
| 678 | vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1); |
| 679 | |
| 680 | vcpu->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES); |
| 681 | vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); |
| 682 | |
| 683 | flags = vmcs_readl(GUEST_RFLAGS); |
| 684 | vcpu->rmode.save_iopl = (flags & IOPL_MASK) >> IOPL_SHIFT; |
| 685 | |
| 686 | flags |= IOPL_MASK | X86_EFLAGS_VM; |
| 687 | |
| 688 | vmcs_writel(GUEST_RFLAGS, flags); |
| 689 | vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | CR4_VME_MASK); |
| 690 | update_exception_bitmap(vcpu); |
| 691 | |
| 692 | vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4); |
| 693 | vmcs_write32(GUEST_SS_LIMIT, 0xffff); |
| 694 | vmcs_write32(GUEST_SS_AR_BYTES, 0xf3); |
| 695 | |
| 696 | vmcs_write32(GUEST_CS_AR_BYTES, 0xf3); |
Michael Riepe | abacf8d | 2006-12-22 01:05:45 -0800 | [diff] [blame] | 697 | vmcs_write32(GUEST_CS_LIMIT, 0xffff); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 698 | vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4); |
| 699 | |
| 700 | fix_rmode_seg(VCPU_SREG_ES, &vcpu->rmode.es); |
| 701 | fix_rmode_seg(VCPU_SREG_DS, &vcpu->rmode.ds); |
| 702 | fix_rmode_seg(VCPU_SREG_GS, &vcpu->rmode.gs); |
| 703 | fix_rmode_seg(VCPU_SREG_FS, &vcpu->rmode.fs); |
| 704 | } |
| 705 | |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 706 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 707 | |
| 708 | static void enter_lmode(struct kvm_vcpu *vcpu) |
| 709 | { |
| 710 | u32 guest_tr_ar; |
| 711 | |
| 712 | guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES); |
| 713 | if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) { |
| 714 | printk(KERN_DEBUG "%s: tss fixup for long mode. \n", |
| 715 | __FUNCTION__); |
| 716 | vmcs_write32(GUEST_TR_AR_BYTES, |
| 717 | (guest_tr_ar & ~AR_TYPE_MASK) |
| 718 | | AR_TYPE_BUSY_64_TSS); |
| 719 | } |
| 720 | |
| 721 | vcpu->shadow_efer |= EFER_LMA; |
| 722 | |
| 723 | find_msr_entry(vcpu, MSR_EFER)->data |= EFER_LMA | EFER_LME; |
| 724 | vmcs_write32(VM_ENTRY_CONTROLS, |
| 725 | vmcs_read32(VM_ENTRY_CONTROLS) |
| 726 | | VM_ENTRY_CONTROLS_IA32E_MASK); |
| 727 | } |
| 728 | |
| 729 | static void exit_lmode(struct kvm_vcpu *vcpu) |
| 730 | { |
| 731 | vcpu->shadow_efer &= ~EFER_LMA; |
| 732 | |
| 733 | vmcs_write32(VM_ENTRY_CONTROLS, |
| 734 | vmcs_read32(VM_ENTRY_CONTROLS) |
| 735 | & ~VM_ENTRY_CONTROLS_IA32E_MASK); |
| 736 | } |
| 737 | |
| 738 | #endif |
| 739 | |
| 740 | static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) |
| 741 | { |
| 742 | if (vcpu->rmode.active && (cr0 & CR0_PE_MASK)) |
| 743 | enter_pmode(vcpu); |
| 744 | |
| 745 | if (!vcpu->rmode.active && !(cr0 & CR0_PE_MASK)) |
| 746 | enter_rmode(vcpu); |
| 747 | |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 748 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 749 | if (vcpu->shadow_efer & EFER_LME) { |
| 750 | if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) |
| 751 | enter_lmode(vcpu); |
| 752 | if (is_paging(vcpu) && !(cr0 & CR0_PG_MASK)) |
| 753 | exit_lmode(vcpu); |
| 754 | } |
| 755 | #endif |
| 756 | |
| 757 | vmcs_writel(CR0_READ_SHADOW, cr0); |
| 758 | vmcs_writel(GUEST_CR0, |
| 759 | (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON); |
| 760 | vcpu->cr0 = cr0; |
| 761 | } |
| 762 | |
| 763 | /* |
| 764 | * Used when restoring the VM to avoid corrupting segment registers |
| 765 | */ |
| 766 | static void vmx_set_cr0_no_modeswitch(struct kvm_vcpu *vcpu, unsigned long cr0) |
| 767 | { |
| 768 | vcpu->rmode.active = ((cr0 & CR0_PE_MASK) == 0); |
| 769 | update_exception_bitmap(vcpu); |
| 770 | vmcs_writel(CR0_READ_SHADOW, cr0); |
| 771 | vmcs_writel(GUEST_CR0, |
| 772 | (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON); |
| 773 | vcpu->cr0 = cr0; |
| 774 | } |
| 775 | |
| 776 | static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) |
| 777 | { |
| 778 | vmcs_writel(GUEST_CR3, cr3); |
| 779 | } |
| 780 | |
| 781 | static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) |
| 782 | { |
| 783 | vmcs_writel(CR4_READ_SHADOW, cr4); |
| 784 | vmcs_writel(GUEST_CR4, cr4 | (vcpu->rmode.active ? |
| 785 | KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON)); |
| 786 | vcpu->cr4 = cr4; |
| 787 | } |
| 788 | |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 789 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 790 | |
| 791 | static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer) |
| 792 | { |
| 793 | struct vmx_msr_entry *msr = find_msr_entry(vcpu, MSR_EFER); |
| 794 | |
| 795 | vcpu->shadow_efer = efer; |
| 796 | if (efer & EFER_LMA) { |
| 797 | vmcs_write32(VM_ENTRY_CONTROLS, |
| 798 | vmcs_read32(VM_ENTRY_CONTROLS) | |
| 799 | VM_ENTRY_CONTROLS_IA32E_MASK); |
| 800 | msr->data = efer; |
| 801 | |
| 802 | } else { |
| 803 | vmcs_write32(VM_ENTRY_CONTROLS, |
| 804 | vmcs_read32(VM_ENTRY_CONTROLS) & |
| 805 | ~VM_ENTRY_CONTROLS_IA32E_MASK); |
| 806 | |
| 807 | msr->data = efer & ~EFER_LME; |
| 808 | } |
| 809 | } |
| 810 | |
| 811 | #endif |
| 812 | |
| 813 | static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg) |
| 814 | { |
| 815 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; |
| 816 | |
| 817 | return vmcs_readl(sf->base); |
| 818 | } |
| 819 | |
| 820 | static void vmx_get_segment(struct kvm_vcpu *vcpu, |
| 821 | struct kvm_segment *var, int seg) |
| 822 | { |
| 823 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; |
| 824 | u32 ar; |
| 825 | |
| 826 | var->base = vmcs_readl(sf->base); |
| 827 | var->limit = vmcs_read32(sf->limit); |
| 828 | var->selector = vmcs_read16(sf->selector); |
| 829 | ar = vmcs_read32(sf->ar_bytes); |
| 830 | if (ar & AR_UNUSABLE_MASK) |
| 831 | ar = 0; |
| 832 | var->type = ar & 15; |
| 833 | var->s = (ar >> 4) & 1; |
| 834 | var->dpl = (ar >> 5) & 3; |
| 835 | var->present = (ar >> 7) & 1; |
| 836 | var->avl = (ar >> 12) & 1; |
| 837 | var->l = (ar >> 13) & 1; |
| 838 | var->db = (ar >> 14) & 1; |
| 839 | var->g = (ar >> 15) & 1; |
| 840 | var->unusable = (ar >> 16) & 1; |
| 841 | } |
| 842 | |
| 843 | static void vmx_set_segment(struct kvm_vcpu *vcpu, |
| 844 | struct kvm_segment *var, int seg) |
| 845 | { |
| 846 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; |
| 847 | u32 ar; |
| 848 | |
| 849 | vmcs_writel(sf->base, var->base); |
| 850 | vmcs_write32(sf->limit, var->limit); |
| 851 | vmcs_write16(sf->selector, var->selector); |
| 852 | if (var->unusable) |
| 853 | ar = 1 << 16; |
| 854 | else { |
| 855 | ar = var->type & 15; |
| 856 | ar |= (var->s & 1) << 4; |
| 857 | ar |= (var->dpl & 3) << 5; |
| 858 | ar |= (var->present & 1) << 7; |
| 859 | ar |= (var->avl & 1) << 12; |
| 860 | ar |= (var->l & 1) << 13; |
| 861 | ar |= (var->db & 1) << 14; |
| 862 | ar |= (var->g & 1) << 15; |
| 863 | } |
Uri Lublin | f7fbf1f | 2006-12-13 00:34:00 -0800 | [diff] [blame] | 864 | if (ar == 0) /* a 0 value means unusable */ |
| 865 | ar = AR_UNUSABLE_MASK; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 866 | vmcs_write32(sf->ar_bytes, ar); |
| 867 | } |
| 868 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 869 | static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) |
| 870 | { |
| 871 | u32 ar = vmcs_read32(GUEST_CS_AR_BYTES); |
| 872 | |
| 873 | *db = (ar >> 14) & 1; |
| 874 | *l = (ar >> 13) & 1; |
| 875 | } |
| 876 | |
| 877 | static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| 878 | { |
| 879 | dt->limit = vmcs_read32(GUEST_IDTR_LIMIT); |
| 880 | dt->base = vmcs_readl(GUEST_IDTR_BASE); |
| 881 | } |
| 882 | |
| 883 | static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| 884 | { |
| 885 | vmcs_write32(GUEST_IDTR_LIMIT, dt->limit); |
| 886 | vmcs_writel(GUEST_IDTR_BASE, dt->base); |
| 887 | } |
| 888 | |
| 889 | static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| 890 | { |
| 891 | dt->limit = vmcs_read32(GUEST_GDTR_LIMIT); |
| 892 | dt->base = vmcs_readl(GUEST_GDTR_BASE); |
| 893 | } |
| 894 | |
| 895 | static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) |
| 896 | { |
| 897 | vmcs_write32(GUEST_GDTR_LIMIT, dt->limit); |
| 898 | vmcs_writel(GUEST_GDTR_BASE, dt->base); |
| 899 | } |
| 900 | |
| 901 | static int init_rmode_tss(struct kvm* kvm) |
| 902 | { |
| 903 | struct page *p1, *p2, *p3; |
| 904 | gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT; |
| 905 | char *page; |
| 906 | |
| 907 | p1 = _gfn_to_page(kvm, fn++); |
| 908 | p2 = _gfn_to_page(kvm, fn++); |
| 909 | p3 = _gfn_to_page(kvm, fn); |
| 910 | |
| 911 | if (!p1 || !p2 || !p3) { |
| 912 | kvm_printf(kvm,"%s: gfn_to_page failed\n", __FUNCTION__); |
| 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | page = kmap_atomic(p1, KM_USER0); |
| 917 | memset(page, 0, PAGE_SIZE); |
| 918 | *(u16*)(page + 0x66) = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE; |
| 919 | kunmap_atomic(page, KM_USER0); |
| 920 | |
| 921 | page = kmap_atomic(p2, KM_USER0); |
| 922 | memset(page, 0, PAGE_SIZE); |
| 923 | kunmap_atomic(page, KM_USER0); |
| 924 | |
| 925 | page = kmap_atomic(p3, KM_USER0); |
| 926 | memset(page, 0, PAGE_SIZE); |
| 927 | *(page + RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1) = ~0; |
| 928 | kunmap_atomic(page, KM_USER0); |
| 929 | |
| 930 | return 1; |
| 931 | } |
| 932 | |
| 933 | static void vmcs_write32_fixedbits(u32 msr, u32 vmcs_field, u32 val) |
| 934 | { |
| 935 | u32 msr_high, msr_low; |
| 936 | |
| 937 | rdmsr(msr, msr_low, msr_high); |
| 938 | |
| 939 | val &= msr_high; |
| 940 | val |= msr_low; |
| 941 | vmcs_write32(vmcs_field, val); |
| 942 | } |
| 943 | |
| 944 | static void seg_setup(int seg) |
| 945 | { |
| 946 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; |
| 947 | |
| 948 | vmcs_write16(sf->selector, 0); |
| 949 | vmcs_writel(sf->base, 0); |
| 950 | vmcs_write32(sf->limit, 0xffff); |
| 951 | vmcs_write32(sf->ar_bytes, 0x93); |
| 952 | } |
| 953 | |
| 954 | /* |
| 955 | * Sets up the vmcs for emulated real mode. |
| 956 | */ |
| 957 | static int vmx_vcpu_setup(struct kvm_vcpu *vcpu) |
| 958 | { |
| 959 | u32 host_sysenter_cs; |
| 960 | u32 junk; |
| 961 | unsigned long a; |
| 962 | struct descriptor_table dt; |
| 963 | int i; |
| 964 | int ret = 0; |
| 965 | int nr_good_msrs; |
| 966 | extern asmlinkage void kvm_vmx_return(void); |
| 967 | |
| 968 | if (!init_rmode_tss(vcpu->kvm)) { |
| 969 | ret = -ENOMEM; |
| 970 | goto out; |
| 971 | } |
| 972 | |
| 973 | memset(vcpu->regs, 0, sizeof(vcpu->regs)); |
| 974 | vcpu->regs[VCPU_REGS_RDX] = get_rdx_init_val(); |
| 975 | vcpu->cr8 = 0; |
| 976 | vcpu->apic_base = 0xfee00000 | |
| 977 | /*for vcpu 0*/ MSR_IA32_APICBASE_BSP | |
| 978 | MSR_IA32_APICBASE_ENABLE; |
| 979 | |
| 980 | fx_init(vcpu); |
| 981 | |
| 982 | /* |
| 983 | * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode |
| 984 | * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh. |
| 985 | */ |
| 986 | vmcs_write16(GUEST_CS_SELECTOR, 0xf000); |
| 987 | vmcs_writel(GUEST_CS_BASE, 0x000f0000); |
| 988 | vmcs_write32(GUEST_CS_LIMIT, 0xffff); |
| 989 | vmcs_write32(GUEST_CS_AR_BYTES, 0x9b); |
| 990 | |
| 991 | seg_setup(VCPU_SREG_DS); |
| 992 | seg_setup(VCPU_SREG_ES); |
| 993 | seg_setup(VCPU_SREG_FS); |
| 994 | seg_setup(VCPU_SREG_GS); |
| 995 | seg_setup(VCPU_SREG_SS); |
| 996 | |
| 997 | vmcs_write16(GUEST_TR_SELECTOR, 0); |
| 998 | vmcs_writel(GUEST_TR_BASE, 0); |
| 999 | vmcs_write32(GUEST_TR_LIMIT, 0xffff); |
| 1000 | vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); |
| 1001 | |
| 1002 | vmcs_write16(GUEST_LDTR_SELECTOR, 0); |
| 1003 | vmcs_writel(GUEST_LDTR_BASE, 0); |
| 1004 | vmcs_write32(GUEST_LDTR_LIMIT, 0xffff); |
| 1005 | vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082); |
| 1006 | |
| 1007 | vmcs_write32(GUEST_SYSENTER_CS, 0); |
| 1008 | vmcs_writel(GUEST_SYSENTER_ESP, 0); |
| 1009 | vmcs_writel(GUEST_SYSENTER_EIP, 0); |
| 1010 | |
| 1011 | vmcs_writel(GUEST_RFLAGS, 0x02); |
| 1012 | vmcs_writel(GUEST_RIP, 0xfff0); |
| 1013 | vmcs_writel(GUEST_RSP, 0); |
| 1014 | |
| 1015 | vmcs_writel(GUEST_CR3, 0); |
| 1016 | |
| 1017 | //todo: dr0 = dr1 = dr2 = dr3 = 0; dr6 = 0xffff0ff0 |
| 1018 | vmcs_writel(GUEST_DR7, 0x400); |
| 1019 | |
| 1020 | vmcs_writel(GUEST_GDTR_BASE, 0); |
| 1021 | vmcs_write32(GUEST_GDTR_LIMIT, 0xffff); |
| 1022 | |
| 1023 | vmcs_writel(GUEST_IDTR_BASE, 0); |
| 1024 | vmcs_write32(GUEST_IDTR_LIMIT, 0xffff); |
| 1025 | |
| 1026 | vmcs_write32(GUEST_ACTIVITY_STATE, 0); |
| 1027 | vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0); |
| 1028 | vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0); |
| 1029 | |
| 1030 | /* I/O */ |
| 1031 | vmcs_write64(IO_BITMAP_A, 0); |
| 1032 | vmcs_write64(IO_BITMAP_B, 0); |
| 1033 | |
| 1034 | guest_write_tsc(0); |
| 1035 | |
| 1036 | vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */ |
| 1037 | |
| 1038 | /* Special registers */ |
| 1039 | vmcs_write64(GUEST_IA32_DEBUGCTL, 0); |
| 1040 | |
| 1041 | /* Control */ |
Nguyen Anh Quynh | c68876f | 2006-12-29 16:49:54 -0800 | [diff] [blame] | 1042 | vmcs_write32_fixedbits(MSR_IA32_VMX_PINBASED_CTLS, |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1043 | PIN_BASED_VM_EXEC_CONTROL, |
| 1044 | PIN_BASED_EXT_INTR_MASK /* 20.6.1 */ |
| 1045 | | PIN_BASED_NMI_EXITING /* 20.6.1 */ |
| 1046 | ); |
Nguyen Anh Quynh | c68876f | 2006-12-29 16:49:54 -0800 | [diff] [blame] | 1047 | vmcs_write32_fixedbits(MSR_IA32_VMX_PROCBASED_CTLS, |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1048 | CPU_BASED_VM_EXEC_CONTROL, |
| 1049 | CPU_BASED_HLT_EXITING /* 20.6.2 */ |
| 1050 | | CPU_BASED_CR8_LOAD_EXITING /* 20.6.2 */ |
| 1051 | | CPU_BASED_CR8_STORE_EXITING /* 20.6.2 */ |
| 1052 | | CPU_BASED_UNCOND_IO_EXITING /* 20.6.2 */ |
| 1053 | | CPU_BASED_INVDPG_EXITING |
| 1054 | | CPU_BASED_MOV_DR_EXITING |
| 1055 | | CPU_BASED_USE_TSC_OFFSETING /* 21.3 */ |
| 1056 | ); |
| 1057 | |
| 1058 | vmcs_write32(EXCEPTION_BITMAP, 1 << PF_VECTOR); |
| 1059 | vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0); |
| 1060 | vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0); |
| 1061 | vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */ |
| 1062 | |
| 1063 | vmcs_writel(HOST_CR0, read_cr0()); /* 22.2.3 */ |
| 1064 | vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */ |
| 1065 | vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */ |
| 1066 | |
| 1067 | vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */ |
| 1068 | vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ |
| 1069 | vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */ |
| 1070 | vmcs_write16(HOST_FS_SELECTOR, read_fs()); /* 22.2.4 */ |
| 1071 | vmcs_write16(HOST_GS_SELECTOR, read_gs()); /* 22.2.4 */ |
| 1072 | vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 1073 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1074 | rdmsrl(MSR_FS_BASE, a); |
| 1075 | vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */ |
| 1076 | rdmsrl(MSR_GS_BASE, a); |
| 1077 | vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */ |
| 1078 | #else |
| 1079 | vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */ |
| 1080 | vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */ |
| 1081 | #endif |
| 1082 | |
| 1083 | vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */ |
| 1084 | |
| 1085 | get_idt(&dt); |
| 1086 | vmcs_writel(HOST_IDTR_BASE, dt.base); /* 22.2.4 */ |
| 1087 | |
| 1088 | |
| 1089 | vmcs_writel(HOST_RIP, (unsigned long)kvm_vmx_return); /* 22.2.5 */ |
| 1090 | |
| 1091 | rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk); |
| 1092 | vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs); |
| 1093 | rdmsrl(MSR_IA32_SYSENTER_ESP, a); |
| 1094 | vmcs_writel(HOST_IA32_SYSENTER_ESP, a); /* 22.2.3 */ |
| 1095 | rdmsrl(MSR_IA32_SYSENTER_EIP, a); |
| 1096 | vmcs_writel(HOST_IA32_SYSENTER_EIP, a); /* 22.2.3 */ |
| 1097 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1098 | for (i = 0; i < NR_VMX_MSR; ++i) { |
| 1099 | u32 index = vmx_msr_index[i]; |
| 1100 | u32 data_low, data_high; |
| 1101 | u64 data; |
| 1102 | int j = vcpu->nmsrs; |
| 1103 | |
| 1104 | if (rdmsr_safe(index, &data_low, &data_high) < 0) |
| 1105 | continue; |
| 1106 | data = data_low | ((u64)data_high << 32); |
| 1107 | vcpu->host_msrs[j].index = index; |
| 1108 | vcpu->host_msrs[j].reserved = 0; |
| 1109 | vcpu->host_msrs[j].data = data; |
| 1110 | vcpu->guest_msrs[j] = vcpu->host_msrs[j]; |
| 1111 | ++vcpu->nmsrs; |
| 1112 | } |
| 1113 | printk(KERN_DEBUG "kvm: msrs: %d\n", vcpu->nmsrs); |
| 1114 | |
| 1115 | nr_good_msrs = vcpu->nmsrs - NR_BAD_MSRS; |
| 1116 | vmcs_writel(VM_ENTRY_MSR_LOAD_ADDR, |
| 1117 | virt_to_phys(vcpu->guest_msrs + NR_BAD_MSRS)); |
| 1118 | vmcs_writel(VM_EXIT_MSR_STORE_ADDR, |
| 1119 | virt_to_phys(vcpu->guest_msrs + NR_BAD_MSRS)); |
| 1120 | vmcs_writel(VM_EXIT_MSR_LOAD_ADDR, |
| 1121 | virt_to_phys(vcpu->host_msrs + NR_BAD_MSRS)); |
Nguyen Anh Quynh | c68876f | 2006-12-29 16:49:54 -0800 | [diff] [blame] | 1122 | vmcs_write32_fixedbits(MSR_IA32_VMX_EXIT_CTLS, VM_EXIT_CONTROLS, |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1123 | (HOST_IS_64 << 9)); /* 22.2,1, 20.7.1 */ |
| 1124 | vmcs_write32(VM_EXIT_MSR_STORE_COUNT, nr_good_msrs); /* 22.2.2 */ |
| 1125 | vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, nr_good_msrs); /* 22.2.2 */ |
| 1126 | vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, nr_good_msrs); /* 22.2.2 */ |
| 1127 | |
| 1128 | |
| 1129 | /* 22.2.1, 20.8.1 */ |
Nguyen Anh Quynh | c68876f | 2006-12-29 16:49:54 -0800 | [diff] [blame] | 1130 | vmcs_write32_fixedbits(MSR_IA32_VMX_ENTRY_CTLS, |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1131 | VM_ENTRY_CONTROLS, 0); |
| 1132 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */ |
| 1133 | |
Michael Riepe | 3b99ab2 | 2006-12-13 00:34:15 -0800 | [diff] [blame] | 1134 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1135 | vmcs_writel(VIRTUAL_APIC_PAGE_ADDR, 0); |
| 1136 | vmcs_writel(TPR_THRESHOLD, 0); |
Michael Riepe | 3b99ab2 | 2006-12-13 00:34:15 -0800 | [diff] [blame] | 1137 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1138 | |
| 1139 | vmcs_writel(CR0_GUEST_HOST_MASK, KVM_GUEST_CR0_MASK); |
| 1140 | vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK); |
| 1141 | |
| 1142 | vcpu->cr0 = 0x60000010; |
| 1143 | vmx_set_cr0(vcpu, vcpu->cr0); // enter rmode |
| 1144 | vmx_set_cr4(vcpu, 0); |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 1145 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1146 | vmx_set_efer(vcpu, 0); |
| 1147 | #endif |
| 1148 | |
| 1149 | return 0; |
| 1150 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1151 | out: |
| 1152 | return ret; |
| 1153 | } |
| 1154 | |
| 1155 | static void inject_rmode_irq(struct kvm_vcpu *vcpu, int irq) |
| 1156 | { |
| 1157 | u16 ent[2]; |
| 1158 | u16 cs; |
| 1159 | u16 ip; |
| 1160 | unsigned long flags; |
| 1161 | unsigned long ss_base = vmcs_readl(GUEST_SS_BASE); |
| 1162 | u16 sp = vmcs_readl(GUEST_RSP); |
| 1163 | u32 ss_limit = vmcs_read32(GUEST_SS_LIMIT); |
| 1164 | |
| 1165 | if (sp > ss_limit || sp - 6 > sp) { |
| 1166 | vcpu_printf(vcpu, "%s: #SS, rsp 0x%lx ss 0x%lx limit 0x%x\n", |
| 1167 | __FUNCTION__, |
| 1168 | vmcs_readl(GUEST_RSP), |
| 1169 | vmcs_readl(GUEST_SS_BASE), |
| 1170 | vmcs_read32(GUEST_SS_LIMIT)); |
| 1171 | return; |
| 1172 | } |
| 1173 | |
| 1174 | if (kvm_read_guest(vcpu, irq * sizeof(ent), sizeof(ent), &ent) != |
| 1175 | sizeof(ent)) { |
| 1176 | vcpu_printf(vcpu, "%s: read guest err\n", __FUNCTION__); |
| 1177 | return; |
| 1178 | } |
| 1179 | |
| 1180 | flags = vmcs_readl(GUEST_RFLAGS); |
| 1181 | cs = vmcs_readl(GUEST_CS_BASE) >> 4; |
| 1182 | ip = vmcs_readl(GUEST_RIP); |
| 1183 | |
| 1184 | |
| 1185 | if (kvm_write_guest(vcpu, ss_base + sp - 2, 2, &flags) != 2 || |
| 1186 | kvm_write_guest(vcpu, ss_base + sp - 4, 2, &cs) != 2 || |
| 1187 | kvm_write_guest(vcpu, ss_base + sp - 6, 2, &ip) != 2) { |
| 1188 | vcpu_printf(vcpu, "%s: write guest err\n", __FUNCTION__); |
| 1189 | return; |
| 1190 | } |
| 1191 | |
| 1192 | vmcs_writel(GUEST_RFLAGS, flags & |
| 1193 | ~( X86_EFLAGS_IF | X86_EFLAGS_AC | X86_EFLAGS_TF)); |
| 1194 | vmcs_write16(GUEST_CS_SELECTOR, ent[1]) ; |
| 1195 | vmcs_writel(GUEST_CS_BASE, ent[1] << 4); |
| 1196 | vmcs_writel(GUEST_RIP, ent[0]); |
| 1197 | vmcs_writel(GUEST_RSP, (vmcs_readl(GUEST_RSP) & ~0xffff) | (sp - 6)); |
| 1198 | } |
| 1199 | |
| 1200 | static void kvm_do_inject_irq(struct kvm_vcpu *vcpu) |
| 1201 | { |
| 1202 | int word_index = __ffs(vcpu->irq_summary); |
| 1203 | int bit_index = __ffs(vcpu->irq_pending[word_index]); |
| 1204 | int irq = word_index * BITS_PER_LONG + bit_index; |
| 1205 | |
| 1206 | clear_bit(bit_index, &vcpu->irq_pending[word_index]); |
| 1207 | if (!vcpu->irq_pending[word_index]) |
| 1208 | clear_bit(word_index, &vcpu->irq_summary); |
| 1209 | |
| 1210 | if (vcpu->rmode.active) { |
| 1211 | inject_rmode_irq(vcpu, irq); |
| 1212 | return; |
| 1213 | } |
| 1214 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, |
| 1215 | irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK); |
| 1216 | } |
| 1217 | |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1218 | |
| 1219 | static void do_interrupt_requests(struct kvm_vcpu *vcpu, |
| 1220 | struct kvm_run *kvm_run) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1221 | { |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1222 | u32 cpu_based_vm_exec_control; |
| 1223 | |
| 1224 | vcpu->interrupt_window_open = |
| 1225 | ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) && |
| 1226 | (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0); |
| 1227 | |
| 1228 | if (vcpu->interrupt_window_open && |
| 1229 | vcpu->irq_summary && |
| 1230 | !(vmcs_read32(VM_ENTRY_INTR_INFO_FIELD) & INTR_INFO_VALID_MASK)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1231 | /* |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1232 | * If interrupts enabled, and not blocked by sti or mov ss. Good. |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1233 | */ |
| 1234 | kvm_do_inject_irq(vcpu); |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1235 | |
| 1236 | cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); |
| 1237 | if (!vcpu->interrupt_window_open && |
| 1238 | (vcpu->irq_summary || kvm_run->request_interrupt_window)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1239 | /* |
| 1240 | * Interrupts blocked. Wait for unblock. |
| 1241 | */ |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1242 | cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING; |
| 1243 | else |
| 1244 | cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING; |
| 1245 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1246 | } |
| 1247 | |
| 1248 | static void kvm_guest_debug_pre(struct kvm_vcpu *vcpu) |
| 1249 | { |
| 1250 | struct kvm_guest_debug *dbg = &vcpu->guest_debug; |
| 1251 | |
| 1252 | set_debugreg(dbg->bp[0], 0); |
| 1253 | set_debugreg(dbg->bp[1], 1); |
| 1254 | set_debugreg(dbg->bp[2], 2); |
| 1255 | set_debugreg(dbg->bp[3], 3); |
| 1256 | |
| 1257 | if (dbg->singlestep) { |
| 1258 | unsigned long flags; |
| 1259 | |
| 1260 | flags = vmcs_readl(GUEST_RFLAGS); |
| 1261 | flags |= X86_EFLAGS_TF | X86_EFLAGS_RF; |
| 1262 | vmcs_writel(GUEST_RFLAGS, flags); |
| 1263 | } |
| 1264 | } |
| 1265 | |
| 1266 | static int handle_rmode_exception(struct kvm_vcpu *vcpu, |
| 1267 | int vec, u32 err_code) |
| 1268 | { |
| 1269 | if (!vcpu->rmode.active) |
| 1270 | return 0; |
| 1271 | |
| 1272 | if (vec == GP_VECTOR && err_code == 0) |
| 1273 | if (emulate_instruction(vcpu, NULL, 0, 0) == EMULATE_DONE) |
| 1274 | return 1; |
| 1275 | return 0; |
| 1276 | } |
| 1277 | |
| 1278 | static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1279 | { |
| 1280 | u32 intr_info, error_code; |
| 1281 | unsigned long cr2, rip; |
| 1282 | u32 vect_info; |
| 1283 | enum emulation_result er; |
| 1284 | |
| 1285 | vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); |
| 1286 | intr_info = vmcs_read32(VM_EXIT_INTR_INFO); |
| 1287 | |
| 1288 | if ((vect_info & VECTORING_INFO_VALID_MASK) && |
| 1289 | !is_page_fault(intr_info)) { |
| 1290 | printk(KERN_ERR "%s: unexpected, vectoring info 0x%x " |
| 1291 | "intr info 0x%x\n", __FUNCTION__, vect_info, intr_info); |
| 1292 | } |
| 1293 | |
| 1294 | if (is_external_interrupt(vect_info)) { |
| 1295 | int irq = vect_info & VECTORING_INFO_VECTOR_MASK; |
| 1296 | set_bit(irq, vcpu->irq_pending); |
| 1297 | set_bit(irq / BITS_PER_LONG, &vcpu->irq_summary); |
| 1298 | } |
| 1299 | |
| 1300 | if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */ |
| 1301 | asm ("int $2"); |
| 1302 | return 1; |
| 1303 | } |
| 1304 | error_code = 0; |
| 1305 | rip = vmcs_readl(GUEST_RIP); |
| 1306 | if (intr_info & INTR_INFO_DELIEVER_CODE_MASK) |
| 1307 | error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE); |
| 1308 | if (is_page_fault(intr_info)) { |
| 1309 | cr2 = vmcs_readl(EXIT_QUALIFICATION); |
| 1310 | |
| 1311 | spin_lock(&vcpu->kvm->lock); |
| 1312 | if (!vcpu->mmu.page_fault(vcpu, cr2, error_code)) { |
| 1313 | spin_unlock(&vcpu->kvm->lock); |
| 1314 | return 1; |
| 1315 | } |
| 1316 | |
| 1317 | er = emulate_instruction(vcpu, kvm_run, cr2, error_code); |
| 1318 | spin_unlock(&vcpu->kvm->lock); |
| 1319 | |
| 1320 | switch (er) { |
| 1321 | case EMULATE_DONE: |
| 1322 | return 1; |
| 1323 | case EMULATE_DO_MMIO: |
| 1324 | ++kvm_stat.mmio_exits; |
| 1325 | kvm_run->exit_reason = KVM_EXIT_MMIO; |
| 1326 | return 0; |
| 1327 | case EMULATE_FAIL: |
| 1328 | vcpu_printf(vcpu, "%s: emulate fail\n", __FUNCTION__); |
| 1329 | break; |
| 1330 | default: |
| 1331 | BUG(); |
| 1332 | } |
| 1333 | } |
| 1334 | |
| 1335 | if (vcpu->rmode.active && |
| 1336 | handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK, |
| 1337 | error_code)) |
| 1338 | return 1; |
| 1339 | |
| 1340 | if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) == (INTR_TYPE_EXCEPTION | 1)) { |
| 1341 | kvm_run->exit_reason = KVM_EXIT_DEBUG; |
| 1342 | return 0; |
| 1343 | } |
| 1344 | kvm_run->exit_reason = KVM_EXIT_EXCEPTION; |
| 1345 | kvm_run->ex.exception = intr_info & INTR_INFO_VECTOR_MASK; |
| 1346 | kvm_run->ex.error_code = error_code; |
| 1347 | return 0; |
| 1348 | } |
| 1349 | |
| 1350 | static int handle_external_interrupt(struct kvm_vcpu *vcpu, |
| 1351 | struct kvm_run *kvm_run) |
| 1352 | { |
| 1353 | ++kvm_stat.irq_exits; |
| 1354 | return 1; |
| 1355 | } |
| 1356 | |
| 1357 | |
| 1358 | static int get_io_count(struct kvm_vcpu *vcpu, u64 *count) |
| 1359 | { |
| 1360 | u64 inst; |
| 1361 | gva_t rip; |
| 1362 | int countr_size; |
| 1363 | int i, n; |
| 1364 | |
| 1365 | if ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_VM)) { |
| 1366 | countr_size = 2; |
| 1367 | } else { |
| 1368 | u32 cs_ar = vmcs_read32(GUEST_CS_AR_BYTES); |
| 1369 | |
| 1370 | countr_size = (cs_ar & AR_L_MASK) ? 8: |
| 1371 | (cs_ar & AR_DB_MASK) ? 4: 2; |
| 1372 | } |
| 1373 | |
| 1374 | rip = vmcs_readl(GUEST_RIP); |
| 1375 | if (countr_size != 8) |
| 1376 | rip += vmcs_readl(GUEST_CS_BASE); |
| 1377 | |
| 1378 | n = kvm_read_guest(vcpu, rip, sizeof(inst), &inst); |
| 1379 | |
| 1380 | for (i = 0; i < n; i++) { |
| 1381 | switch (((u8*)&inst)[i]) { |
| 1382 | case 0xf0: |
| 1383 | case 0xf2: |
| 1384 | case 0xf3: |
| 1385 | case 0x2e: |
| 1386 | case 0x36: |
| 1387 | case 0x3e: |
| 1388 | case 0x26: |
| 1389 | case 0x64: |
| 1390 | case 0x65: |
| 1391 | case 0x66: |
| 1392 | break; |
| 1393 | case 0x67: |
| 1394 | countr_size = (countr_size == 2) ? 4: (countr_size >> 1); |
| 1395 | default: |
| 1396 | goto done; |
| 1397 | } |
| 1398 | } |
| 1399 | return 0; |
| 1400 | done: |
| 1401 | countr_size *= 8; |
| 1402 | *count = vcpu->regs[VCPU_REGS_RCX] & (~0ULL >> (64 - countr_size)); |
| 1403 | return 1; |
| 1404 | } |
| 1405 | |
| 1406 | static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1407 | { |
| 1408 | u64 exit_qualification; |
| 1409 | |
| 1410 | ++kvm_stat.io_exits; |
| 1411 | exit_qualification = vmcs_read64(EXIT_QUALIFICATION); |
| 1412 | kvm_run->exit_reason = KVM_EXIT_IO; |
| 1413 | if (exit_qualification & 8) |
| 1414 | kvm_run->io.direction = KVM_EXIT_IO_IN; |
| 1415 | else |
| 1416 | kvm_run->io.direction = KVM_EXIT_IO_OUT; |
| 1417 | kvm_run->io.size = (exit_qualification & 7) + 1; |
| 1418 | kvm_run->io.string = (exit_qualification & 16) != 0; |
| 1419 | kvm_run->io.string_down |
| 1420 | = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0; |
| 1421 | kvm_run->io.rep = (exit_qualification & 32) != 0; |
| 1422 | kvm_run->io.port = exit_qualification >> 16; |
| 1423 | if (kvm_run->io.string) { |
| 1424 | if (!get_io_count(vcpu, &kvm_run->io.count)) |
| 1425 | return 1; |
| 1426 | kvm_run->io.address = vmcs_readl(GUEST_LINEAR_ADDRESS); |
| 1427 | } else |
| 1428 | kvm_run->io.value = vcpu->regs[VCPU_REGS_RAX]; /* rax */ |
| 1429 | return 0; |
| 1430 | } |
| 1431 | |
| 1432 | static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1433 | { |
| 1434 | u64 address = vmcs_read64(EXIT_QUALIFICATION); |
| 1435 | int instruction_length = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); |
| 1436 | spin_lock(&vcpu->kvm->lock); |
| 1437 | vcpu->mmu.inval_page(vcpu, address); |
| 1438 | spin_unlock(&vcpu->kvm->lock); |
| 1439 | vmcs_writel(GUEST_RIP, vmcs_readl(GUEST_RIP) + instruction_length); |
| 1440 | return 1; |
| 1441 | } |
| 1442 | |
| 1443 | static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1444 | { |
| 1445 | u64 exit_qualification; |
| 1446 | int cr; |
| 1447 | int reg; |
| 1448 | |
| 1449 | exit_qualification = vmcs_read64(EXIT_QUALIFICATION); |
| 1450 | cr = exit_qualification & 15; |
| 1451 | reg = (exit_qualification >> 8) & 15; |
| 1452 | switch ((exit_qualification >> 4) & 3) { |
| 1453 | case 0: /* mov to cr */ |
| 1454 | switch (cr) { |
| 1455 | case 0: |
| 1456 | vcpu_load_rsp_rip(vcpu); |
| 1457 | set_cr0(vcpu, vcpu->regs[reg]); |
| 1458 | skip_emulated_instruction(vcpu); |
| 1459 | return 1; |
| 1460 | case 3: |
| 1461 | vcpu_load_rsp_rip(vcpu); |
| 1462 | set_cr3(vcpu, vcpu->regs[reg]); |
| 1463 | skip_emulated_instruction(vcpu); |
| 1464 | return 1; |
| 1465 | case 4: |
| 1466 | vcpu_load_rsp_rip(vcpu); |
| 1467 | set_cr4(vcpu, vcpu->regs[reg]); |
| 1468 | skip_emulated_instruction(vcpu); |
| 1469 | return 1; |
| 1470 | case 8: |
| 1471 | vcpu_load_rsp_rip(vcpu); |
| 1472 | set_cr8(vcpu, vcpu->regs[reg]); |
| 1473 | skip_emulated_instruction(vcpu); |
| 1474 | return 1; |
| 1475 | }; |
| 1476 | break; |
| 1477 | case 1: /*mov from cr*/ |
| 1478 | switch (cr) { |
| 1479 | case 3: |
| 1480 | vcpu_load_rsp_rip(vcpu); |
| 1481 | vcpu->regs[reg] = vcpu->cr3; |
| 1482 | vcpu_put_rsp_rip(vcpu); |
| 1483 | skip_emulated_instruction(vcpu); |
| 1484 | return 1; |
| 1485 | case 8: |
| 1486 | printk(KERN_DEBUG "handle_cr: read CR8 " |
| 1487 | "cpu erratum AA15\n"); |
| 1488 | vcpu_load_rsp_rip(vcpu); |
| 1489 | vcpu->regs[reg] = vcpu->cr8; |
| 1490 | vcpu_put_rsp_rip(vcpu); |
| 1491 | skip_emulated_instruction(vcpu); |
| 1492 | return 1; |
| 1493 | } |
| 1494 | break; |
| 1495 | case 3: /* lmsw */ |
| 1496 | lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f); |
| 1497 | |
| 1498 | skip_emulated_instruction(vcpu); |
| 1499 | return 1; |
| 1500 | default: |
| 1501 | break; |
| 1502 | } |
| 1503 | kvm_run->exit_reason = 0; |
| 1504 | printk(KERN_ERR "kvm: unhandled control register: op %d cr %d\n", |
| 1505 | (int)(exit_qualification >> 4) & 3, cr); |
| 1506 | return 0; |
| 1507 | } |
| 1508 | |
| 1509 | static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1510 | { |
| 1511 | u64 exit_qualification; |
| 1512 | unsigned long val; |
| 1513 | int dr, reg; |
| 1514 | |
| 1515 | /* |
| 1516 | * FIXME: this code assumes the host is debugging the guest. |
| 1517 | * need to deal with guest debugging itself too. |
| 1518 | */ |
| 1519 | exit_qualification = vmcs_read64(EXIT_QUALIFICATION); |
| 1520 | dr = exit_qualification & 7; |
| 1521 | reg = (exit_qualification >> 8) & 15; |
| 1522 | vcpu_load_rsp_rip(vcpu); |
| 1523 | if (exit_qualification & 16) { |
| 1524 | /* mov from dr */ |
| 1525 | switch (dr) { |
| 1526 | case 6: |
| 1527 | val = 0xffff0ff0; |
| 1528 | break; |
| 1529 | case 7: |
| 1530 | val = 0x400; |
| 1531 | break; |
| 1532 | default: |
| 1533 | val = 0; |
| 1534 | } |
| 1535 | vcpu->regs[reg] = val; |
| 1536 | } else { |
| 1537 | /* mov to dr */ |
| 1538 | } |
| 1539 | vcpu_put_rsp_rip(vcpu); |
| 1540 | skip_emulated_instruction(vcpu); |
| 1541 | return 1; |
| 1542 | } |
| 1543 | |
| 1544 | static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1545 | { |
| 1546 | kvm_run->exit_reason = KVM_EXIT_CPUID; |
| 1547 | return 0; |
| 1548 | } |
| 1549 | |
| 1550 | static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1551 | { |
| 1552 | u32 ecx = vcpu->regs[VCPU_REGS_RCX]; |
| 1553 | u64 data; |
| 1554 | |
| 1555 | if (vmx_get_msr(vcpu, ecx, &data)) { |
| 1556 | vmx_inject_gp(vcpu, 0); |
| 1557 | return 1; |
| 1558 | } |
| 1559 | |
| 1560 | /* FIXME: handling of bits 32:63 of rax, rdx */ |
| 1561 | vcpu->regs[VCPU_REGS_RAX] = data & -1u; |
| 1562 | vcpu->regs[VCPU_REGS_RDX] = (data >> 32) & -1u; |
| 1563 | skip_emulated_instruction(vcpu); |
| 1564 | return 1; |
| 1565 | } |
| 1566 | |
| 1567 | static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1568 | { |
| 1569 | u32 ecx = vcpu->regs[VCPU_REGS_RCX]; |
| 1570 | u64 data = (vcpu->regs[VCPU_REGS_RAX] & -1u) |
| 1571 | | ((u64)(vcpu->regs[VCPU_REGS_RDX] & -1u) << 32); |
| 1572 | |
| 1573 | if (vmx_set_msr(vcpu, ecx, data) != 0) { |
| 1574 | vmx_inject_gp(vcpu, 0); |
| 1575 | return 1; |
| 1576 | } |
| 1577 | |
| 1578 | skip_emulated_instruction(vcpu); |
| 1579 | return 1; |
| 1580 | } |
| 1581 | |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1582 | static void post_kvm_run_save(struct kvm_vcpu *vcpu, |
| 1583 | struct kvm_run *kvm_run) |
| 1584 | { |
| 1585 | kvm_run->if_flag = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) != 0; |
| 1586 | kvm_run->cr8 = vcpu->cr8; |
| 1587 | kvm_run->apic_base = vcpu->apic_base; |
| 1588 | kvm_run->ready_for_interrupt_injection = (vcpu->interrupt_window_open && |
| 1589 | vcpu->irq_summary == 0); |
| 1590 | } |
| 1591 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1592 | static int handle_interrupt_window(struct kvm_vcpu *vcpu, |
| 1593 | struct kvm_run *kvm_run) |
| 1594 | { |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1595 | /* |
| 1596 | * If the user space waits to inject interrupts, exit as soon as |
| 1597 | * possible |
| 1598 | */ |
| 1599 | if (kvm_run->request_interrupt_window && |
| 1600 | !vcpu->irq_summary && |
| 1601 | (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF)) { |
| 1602 | kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; |
| 1603 | ++kvm_stat.irq_window_exits; |
| 1604 | return 0; |
| 1605 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1606 | return 1; |
| 1607 | } |
| 1608 | |
| 1609 | static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1610 | { |
| 1611 | skip_emulated_instruction(vcpu); |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1612 | if (vcpu->irq_summary) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1613 | return 1; |
| 1614 | |
| 1615 | kvm_run->exit_reason = KVM_EXIT_HLT; |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1616 | ++kvm_stat.halt_exits; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1617 | return 0; |
| 1618 | } |
| 1619 | |
| 1620 | /* |
| 1621 | * The exit handlers return 1 if the exit was handled fully and guest execution |
| 1622 | * may resume. Otherwise they set the kvm_run parameter to indicate what needs |
| 1623 | * to be done to userspace and return 0. |
| 1624 | */ |
| 1625 | static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu, |
| 1626 | struct kvm_run *kvm_run) = { |
| 1627 | [EXIT_REASON_EXCEPTION_NMI] = handle_exception, |
| 1628 | [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt, |
| 1629 | [EXIT_REASON_IO_INSTRUCTION] = handle_io, |
| 1630 | [EXIT_REASON_INVLPG] = handle_invlpg, |
| 1631 | [EXIT_REASON_CR_ACCESS] = handle_cr, |
| 1632 | [EXIT_REASON_DR_ACCESS] = handle_dr, |
| 1633 | [EXIT_REASON_CPUID] = handle_cpuid, |
| 1634 | [EXIT_REASON_MSR_READ] = handle_rdmsr, |
| 1635 | [EXIT_REASON_MSR_WRITE] = handle_wrmsr, |
| 1636 | [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window, |
| 1637 | [EXIT_REASON_HLT] = handle_halt, |
| 1638 | }; |
| 1639 | |
| 1640 | static const int kvm_vmx_max_exit_handlers = |
| 1641 | sizeof(kvm_vmx_exit_handlers) / sizeof(*kvm_vmx_exit_handlers); |
| 1642 | |
| 1643 | /* |
| 1644 | * The guest has exited. See if we can fix it or if we need userspace |
| 1645 | * assistance. |
| 1646 | */ |
| 1647 | static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) |
| 1648 | { |
| 1649 | u32 vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); |
| 1650 | u32 exit_reason = vmcs_read32(VM_EXIT_REASON); |
| 1651 | |
| 1652 | if ( (vectoring_info & VECTORING_INFO_VALID_MASK) && |
| 1653 | exit_reason != EXIT_REASON_EXCEPTION_NMI ) |
| 1654 | printk(KERN_WARNING "%s: unexpected, valid vectoring info and " |
| 1655 | "exit reason is 0x%x\n", __FUNCTION__, exit_reason); |
| 1656 | kvm_run->instruction_length = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); |
| 1657 | if (exit_reason < kvm_vmx_max_exit_handlers |
| 1658 | && kvm_vmx_exit_handlers[exit_reason]) |
| 1659 | return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run); |
| 1660 | else { |
| 1661 | kvm_run->exit_reason = KVM_EXIT_UNKNOWN; |
| 1662 | kvm_run->hw.hardware_exit_reason = exit_reason; |
| 1663 | } |
| 1664 | return 0; |
| 1665 | } |
| 1666 | |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1667 | /* |
| 1668 | * Check if userspace requested an interrupt window, and that the |
| 1669 | * interrupt window is open. |
| 1670 | * |
| 1671 | * No need to exit to userspace if we already have an interrupt queued. |
| 1672 | */ |
| 1673 | static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu, |
| 1674 | struct kvm_run *kvm_run) |
| 1675 | { |
| 1676 | return (!vcpu->irq_summary && |
| 1677 | kvm_run->request_interrupt_window && |
| 1678 | vcpu->interrupt_window_open && |
| 1679 | (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF)); |
| 1680 | } |
| 1681 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1682 | static int vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) |
| 1683 | { |
| 1684 | u8 fail; |
| 1685 | u16 fs_sel, gs_sel, ldt_sel; |
| 1686 | int fs_gs_ldt_reload_needed; |
| 1687 | |
| 1688 | again: |
| 1689 | /* |
| 1690 | * Set host fs and gs selectors. Unfortunately, 22.2.3 does not |
| 1691 | * allow segment selectors with cpl > 0 or ti == 1. |
| 1692 | */ |
| 1693 | fs_sel = read_fs(); |
| 1694 | gs_sel = read_gs(); |
| 1695 | ldt_sel = read_ldt(); |
| 1696 | fs_gs_ldt_reload_needed = (fs_sel & 7) | (gs_sel & 7) | ldt_sel; |
| 1697 | if (!fs_gs_ldt_reload_needed) { |
| 1698 | vmcs_write16(HOST_FS_SELECTOR, fs_sel); |
| 1699 | vmcs_write16(HOST_GS_SELECTOR, gs_sel); |
| 1700 | } else { |
| 1701 | vmcs_write16(HOST_FS_SELECTOR, 0); |
| 1702 | vmcs_write16(HOST_GS_SELECTOR, 0); |
| 1703 | } |
| 1704 | |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 1705 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1706 | vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE)); |
| 1707 | vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE)); |
| 1708 | #else |
| 1709 | vmcs_writel(HOST_FS_BASE, segment_base(fs_sel)); |
| 1710 | vmcs_writel(HOST_GS_BASE, segment_base(gs_sel)); |
| 1711 | #endif |
| 1712 | |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1713 | do_interrupt_requests(vcpu, kvm_run); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1714 | |
| 1715 | if (vcpu->guest_debug.enabled) |
| 1716 | kvm_guest_debug_pre(vcpu); |
| 1717 | |
| 1718 | fx_save(vcpu->host_fx_image); |
| 1719 | fx_restore(vcpu->guest_fx_image); |
| 1720 | |
| 1721 | save_msrs(vcpu->host_msrs, vcpu->nmsrs); |
| 1722 | load_msrs(vcpu->guest_msrs, NR_BAD_MSRS); |
| 1723 | |
| 1724 | asm ( |
| 1725 | /* Store host registers */ |
| 1726 | "pushf \n\t" |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 1727 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1728 | "push %%rax; push %%rbx; push %%rdx;" |
| 1729 | "push %%rsi; push %%rdi; push %%rbp;" |
| 1730 | "push %%r8; push %%r9; push %%r10; push %%r11;" |
| 1731 | "push %%r12; push %%r13; push %%r14; push %%r15;" |
| 1732 | "push %%rcx \n\t" |
| 1733 | ASM_VMX_VMWRITE_RSP_RDX "\n\t" |
| 1734 | #else |
| 1735 | "pusha; push %%ecx \n\t" |
| 1736 | ASM_VMX_VMWRITE_RSP_RDX "\n\t" |
| 1737 | #endif |
| 1738 | /* Check if vmlaunch of vmresume is needed */ |
| 1739 | "cmp $0, %1 \n\t" |
| 1740 | /* Load guest registers. Don't clobber flags. */ |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 1741 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1742 | "mov %c[cr2](%3), %%rax \n\t" |
| 1743 | "mov %%rax, %%cr2 \n\t" |
| 1744 | "mov %c[rax](%3), %%rax \n\t" |
| 1745 | "mov %c[rbx](%3), %%rbx \n\t" |
| 1746 | "mov %c[rdx](%3), %%rdx \n\t" |
| 1747 | "mov %c[rsi](%3), %%rsi \n\t" |
| 1748 | "mov %c[rdi](%3), %%rdi \n\t" |
| 1749 | "mov %c[rbp](%3), %%rbp \n\t" |
| 1750 | "mov %c[r8](%3), %%r8 \n\t" |
| 1751 | "mov %c[r9](%3), %%r9 \n\t" |
| 1752 | "mov %c[r10](%3), %%r10 \n\t" |
| 1753 | "mov %c[r11](%3), %%r11 \n\t" |
| 1754 | "mov %c[r12](%3), %%r12 \n\t" |
| 1755 | "mov %c[r13](%3), %%r13 \n\t" |
| 1756 | "mov %c[r14](%3), %%r14 \n\t" |
| 1757 | "mov %c[r15](%3), %%r15 \n\t" |
| 1758 | "mov %c[rcx](%3), %%rcx \n\t" /* kills %3 (rcx) */ |
| 1759 | #else |
| 1760 | "mov %c[cr2](%3), %%eax \n\t" |
| 1761 | "mov %%eax, %%cr2 \n\t" |
| 1762 | "mov %c[rax](%3), %%eax \n\t" |
| 1763 | "mov %c[rbx](%3), %%ebx \n\t" |
| 1764 | "mov %c[rdx](%3), %%edx \n\t" |
| 1765 | "mov %c[rsi](%3), %%esi \n\t" |
| 1766 | "mov %c[rdi](%3), %%edi \n\t" |
| 1767 | "mov %c[rbp](%3), %%ebp \n\t" |
| 1768 | "mov %c[rcx](%3), %%ecx \n\t" /* kills %3 (ecx) */ |
| 1769 | #endif |
| 1770 | /* Enter guest mode */ |
| 1771 | "jne launched \n\t" |
| 1772 | ASM_VMX_VMLAUNCH "\n\t" |
| 1773 | "jmp kvm_vmx_return \n\t" |
| 1774 | "launched: " ASM_VMX_VMRESUME "\n\t" |
| 1775 | ".globl kvm_vmx_return \n\t" |
| 1776 | "kvm_vmx_return: " |
| 1777 | /* Save guest registers, load host registers, keep flags */ |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 1778 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1779 | "xchg %3, 0(%%rsp) \n\t" |
| 1780 | "mov %%rax, %c[rax](%3) \n\t" |
| 1781 | "mov %%rbx, %c[rbx](%3) \n\t" |
| 1782 | "pushq 0(%%rsp); popq %c[rcx](%3) \n\t" |
| 1783 | "mov %%rdx, %c[rdx](%3) \n\t" |
| 1784 | "mov %%rsi, %c[rsi](%3) \n\t" |
| 1785 | "mov %%rdi, %c[rdi](%3) \n\t" |
| 1786 | "mov %%rbp, %c[rbp](%3) \n\t" |
| 1787 | "mov %%r8, %c[r8](%3) \n\t" |
| 1788 | "mov %%r9, %c[r9](%3) \n\t" |
| 1789 | "mov %%r10, %c[r10](%3) \n\t" |
| 1790 | "mov %%r11, %c[r11](%3) \n\t" |
| 1791 | "mov %%r12, %c[r12](%3) \n\t" |
| 1792 | "mov %%r13, %c[r13](%3) \n\t" |
| 1793 | "mov %%r14, %c[r14](%3) \n\t" |
| 1794 | "mov %%r15, %c[r15](%3) \n\t" |
| 1795 | "mov %%cr2, %%rax \n\t" |
| 1796 | "mov %%rax, %c[cr2](%3) \n\t" |
| 1797 | "mov 0(%%rsp), %3 \n\t" |
| 1798 | |
| 1799 | "pop %%rcx; pop %%r15; pop %%r14; pop %%r13; pop %%r12;" |
| 1800 | "pop %%r11; pop %%r10; pop %%r9; pop %%r8;" |
| 1801 | "pop %%rbp; pop %%rdi; pop %%rsi;" |
| 1802 | "pop %%rdx; pop %%rbx; pop %%rax \n\t" |
| 1803 | #else |
| 1804 | "xchg %3, 0(%%esp) \n\t" |
| 1805 | "mov %%eax, %c[rax](%3) \n\t" |
| 1806 | "mov %%ebx, %c[rbx](%3) \n\t" |
| 1807 | "pushl 0(%%esp); popl %c[rcx](%3) \n\t" |
| 1808 | "mov %%edx, %c[rdx](%3) \n\t" |
| 1809 | "mov %%esi, %c[rsi](%3) \n\t" |
| 1810 | "mov %%edi, %c[rdi](%3) \n\t" |
| 1811 | "mov %%ebp, %c[rbp](%3) \n\t" |
| 1812 | "mov %%cr2, %%eax \n\t" |
| 1813 | "mov %%eax, %c[cr2](%3) \n\t" |
| 1814 | "mov 0(%%esp), %3 \n\t" |
| 1815 | |
| 1816 | "pop %%ecx; popa \n\t" |
| 1817 | #endif |
| 1818 | "setbe %0 \n\t" |
| 1819 | "popf \n\t" |
| 1820 | : "=g" (fail) |
| 1821 | : "r"(vcpu->launched), "d"((unsigned long)HOST_RSP), |
| 1822 | "c"(vcpu), |
| 1823 | [rax]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RAX])), |
| 1824 | [rbx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBX])), |
| 1825 | [rcx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RCX])), |
| 1826 | [rdx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDX])), |
| 1827 | [rsi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RSI])), |
| 1828 | [rdi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDI])), |
| 1829 | [rbp]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBP])), |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 1830 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1831 | [r8 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R8 ])), |
| 1832 | [r9 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R9 ])), |
| 1833 | [r10]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R10])), |
| 1834 | [r11]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R11])), |
| 1835 | [r12]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R12])), |
| 1836 | [r13]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R13])), |
| 1837 | [r14]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R14])), |
| 1838 | [r15]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R15])), |
| 1839 | #endif |
| 1840 | [cr2]"i"(offsetof(struct kvm_vcpu, cr2)) |
| 1841 | : "cc", "memory" ); |
| 1842 | |
| 1843 | ++kvm_stat.exits; |
| 1844 | |
| 1845 | save_msrs(vcpu->guest_msrs, NR_BAD_MSRS); |
| 1846 | load_msrs(vcpu->host_msrs, NR_BAD_MSRS); |
| 1847 | |
| 1848 | fx_save(vcpu->guest_fx_image); |
| 1849 | fx_restore(vcpu->host_fx_image); |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1850 | vcpu->interrupt_window_open = (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1851 | |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 1852 | #ifndef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1853 | asm ("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS)); |
| 1854 | #endif |
| 1855 | |
| 1856 | kvm_run->exit_type = 0; |
| 1857 | if (fail) { |
| 1858 | kvm_run->exit_type = KVM_EXIT_TYPE_FAIL_ENTRY; |
| 1859 | kvm_run->exit_reason = vmcs_read32(VM_INSTRUCTION_ERROR); |
| 1860 | } else { |
| 1861 | if (fs_gs_ldt_reload_needed) { |
| 1862 | load_ldt(ldt_sel); |
| 1863 | load_fs(fs_sel); |
| 1864 | /* |
| 1865 | * If we have to reload gs, we must take care to |
| 1866 | * preserve our gs base. |
| 1867 | */ |
| 1868 | local_irq_disable(); |
| 1869 | load_gs(gs_sel); |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 1870 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1871 | wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE)); |
| 1872 | #endif |
| 1873 | local_irq_enable(); |
| 1874 | |
| 1875 | reload_tss(); |
| 1876 | } |
| 1877 | vcpu->launched = 1; |
| 1878 | kvm_run->exit_type = KVM_EXIT_TYPE_VM_EXIT; |
| 1879 | if (kvm_handle_exit(kvm_run, vcpu)) { |
| 1880 | /* Give scheduler a change to reschedule. */ |
| 1881 | if (signal_pending(current)) { |
| 1882 | ++kvm_stat.signal_exits; |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1883 | post_kvm_run_save(vcpu, kvm_run); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1884 | return -EINTR; |
| 1885 | } |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1886 | |
| 1887 | if (dm_request_for_irq_injection(vcpu, kvm_run)) { |
| 1888 | ++kvm_stat.request_irq_exits; |
| 1889 | post_kvm_run_save(vcpu, kvm_run); |
| 1890 | return -EINTR; |
| 1891 | } |
| 1892 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1893 | kvm_resched(vcpu); |
| 1894 | goto again; |
| 1895 | } |
| 1896 | } |
Dor Laor | c1150d8 | 2007-01-05 16:36:24 -0800 | [diff] [blame^] | 1897 | |
| 1898 | post_kvm_run_save(vcpu, kvm_run); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1899 | return 0; |
| 1900 | } |
| 1901 | |
| 1902 | static void vmx_flush_tlb(struct kvm_vcpu *vcpu) |
| 1903 | { |
| 1904 | vmcs_writel(GUEST_CR3, vmcs_readl(GUEST_CR3)); |
| 1905 | } |
| 1906 | |
| 1907 | static void vmx_inject_page_fault(struct kvm_vcpu *vcpu, |
| 1908 | unsigned long addr, |
| 1909 | u32 err_code) |
| 1910 | { |
| 1911 | u32 vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); |
| 1912 | |
| 1913 | ++kvm_stat.pf_guest; |
| 1914 | |
| 1915 | if (is_page_fault(vect_info)) { |
| 1916 | printk(KERN_DEBUG "inject_page_fault: " |
| 1917 | "double fault 0x%lx @ 0x%lx\n", |
| 1918 | addr, vmcs_readl(GUEST_RIP)); |
| 1919 | vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, 0); |
| 1920 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, |
| 1921 | DF_VECTOR | |
| 1922 | INTR_TYPE_EXCEPTION | |
| 1923 | INTR_INFO_DELIEVER_CODE_MASK | |
| 1924 | INTR_INFO_VALID_MASK); |
| 1925 | return; |
| 1926 | } |
| 1927 | vcpu->cr2 = addr; |
| 1928 | vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, err_code); |
| 1929 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, |
| 1930 | PF_VECTOR | |
| 1931 | INTR_TYPE_EXCEPTION | |
| 1932 | INTR_INFO_DELIEVER_CODE_MASK | |
| 1933 | INTR_INFO_VALID_MASK); |
| 1934 | |
| 1935 | } |
| 1936 | |
| 1937 | static void vmx_free_vmcs(struct kvm_vcpu *vcpu) |
| 1938 | { |
| 1939 | if (vcpu->vmcs) { |
| 1940 | on_each_cpu(__vcpu_clear, vcpu, 0, 1); |
| 1941 | free_vmcs(vcpu->vmcs); |
| 1942 | vcpu->vmcs = NULL; |
| 1943 | } |
| 1944 | } |
| 1945 | |
| 1946 | static void vmx_free_vcpu(struct kvm_vcpu *vcpu) |
| 1947 | { |
| 1948 | vmx_free_vmcs(vcpu); |
| 1949 | } |
| 1950 | |
| 1951 | static int vmx_create_vcpu(struct kvm_vcpu *vcpu) |
| 1952 | { |
| 1953 | struct vmcs *vmcs; |
| 1954 | |
Ingo Molnar | 965b58a | 2007-01-05 16:36:23 -0800 | [diff] [blame] | 1955 | vcpu->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 1956 | if (!vcpu->guest_msrs) |
| 1957 | return -ENOMEM; |
| 1958 | |
| 1959 | vcpu->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 1960 | if (!vcpu->host_msrs) |
| 1961 | goto out_free_guest_msrs; |
| 1962 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1963 | vmcs = alloc_vmcs(); |
| 1964 | if (!vmcs) |
Ingo Molnar | 965b58a | 2007-01-05 16:36:23 -0800 | [diff] [blame] | 1965 | goto out_free_msrs; |
| 1966 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1967 | vmcs_clear(vmcs); |
| 1968 | vcpu->vmcs = vmcs; |
| 1969 | vcpu->launched = 0; |
Ingo Molnar | 965b58a | 2007-01-05 16:36:23 -0800 | [diff] [blame] | 1970 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1971 | return 0; |
Ingo Molnar | 965b58a | 2007-01-05 16:36:23 -0800 | [diff] [blame] | 1972 | |
| 1973 | out_free_msrs: |
| 1974 | kfree(vcpu->host_msrs); |
| 1975 | vcpu->host_msrs = NULL; |
| 1976 | |
| 1977 | out_free_guest_msrs: |
| 1978 | kfree(vcpu->guest_msrs); |
| 1979 | vcpu->guest_msrs = NULL; |
| 1980 | |
| 1981 | return -ENOMEM; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1982 | } |
| 1983 | |
| 1984 | static struct kvm_arch_ops vmx_arch_ops = { |
| 1985 | .cpu_has_kvm_support = cpu_has_kvm_support, |
| 1986 | .disabled_by_bios = vmx_disabled_by_bios, |
| 1987 | .hardware_setup = hardware_setup, |
| 1988 | .hardware_unsetup = hardware_unsetup, |
| 1989 | .hardware_enable = hardware_enable, |
| 1990 | .hardware_disable = hardware_disable, |
| 1991 | |
| 1992 | .vcpu_create = vmx_create_vcpu, |
| 1993 | .vcpu_free = vmx_free_vcpu, |
| 1994 | |
| 1995 | .vcpu_load = vmx_vcpu_load, |
| 1996 | .vcpu_put = vmx_vcpu_put, |
| 1997 | |
| 1998 | .set_guest_debug = set_guest_debug, |
| 1999 | .get_msr = vmx_get_msr, |
| 2000 | .set_msr = vmx_set_msr, |
| 2001 | .get_segment_base = vmx_get_segment_base, |
| 2002 | .get_segment = vmx_get_segment, |
| 2003 | .set_segment = vmx_set_segment, |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2004 | .get_cs_db_l_bits = vmx_get_cs_db_l_bits, |
| 2005 | .set_cr0 = vmx_set_cr0, |
| 2006 | .set_cr0_no_modeswitch = vmx_set_cr0_no_modeswitch, |
| 2007 | .set_cr3 = vmx_set_cr3, |
| 2008 | .set_cr4 = vmx_set_cr4, |
Avi Kivity | 05b3e0c | 2006-12-13 00:33:45 -0800 | [diff] [blame] | 2009 | #ifdef CONFIG_X86_64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2010 | .set_efer = vmx_set_efer, |
| 2011 | #endif |
| 2012 | .get_idt = vmx_get_idt, |
| 2013 | .set_idt = vmx_set_idt, |
| 2014 | .get_gdt = vmx_get_gdt, |
| 2015 | .set_gdt = vmx_set_gdt, |
| 2016 | .cache_regs = vcpu_load_rsp_rip, |
| 2017 | .decache_regs = vcpu_put_rsp_rip, |
| 2018 | .get_rflags = vmx_get_rflags, |
| 2019 | .set_rflags = vmx_set_rflags, |
| 2020 | |
| 2021 | .tlb_flush = vmx_flush_tlb, |
| 2022 | .inject_page_fault = vmx_inject_page_fault, |
| 2023 | |
| 2024 | .inject_gp = vmx_inject_gp, |
| 2025 | |
| 2026 | .run = vmx_vcpu_run, |
| 2027 | .skip_emulated_instruction = skip_emulated_instruction, |
| 2028 | .vcpu_setup = vmx_vcpu_setup, |
| 2029 | }; |
| 2030 | |
| 2031 | static int __init vmx_init(void) |
| 2032 | { |
Avi Kivity | 873a7c4 | 2006-12-13 00:34:14 -0800 | [diff] [blame] | 2033 | return kvm_init_arch(&vmx_arch_ops, THIS_MODULE); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2034 | } |
| 2035 | |
| 2036 | static void __exit vmx_exit(void) |
| 2037 | { |
| 2038 | kvm_exit_arch(); |
| 2039 | } |
| 2040 | |
| 2041 | module_init(vmx_init) |
| 2042 | module_exit(vmx_exit) |