vmx.c 61.5 KB
Newer Older
A
Avi Kivity 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * This module enables machines with Intel VT-x extensions to run virtual
 * machines without emulation or binary translation.
 *
 * Copyright (C) 2006 Qumranet, Inc.
 *
 * Authors:
 *   Avi Kivity   <avi@qumranet.com>
 *   Yaniv Kamay  <yaniv@qumranet.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#include "kvm.h"
#include "vmx.h"
A
Avi Kivity 已提交
20 21
#include "segment_descriptor.h"

A
Avi Kivity 已提交
22
#include <linux/module.h>
23
#include <linux/kernel.h>
A
Avi Kivity 已提交
24 25
#include <linux/mm.h>
#include <linux/highmem.h>
I
Ingo Molnar 已提交
26
#include <linux/profile.h>
A
Alexey Dobriyan 已提交
27
#include <linux/sched.h>
A
Avi Kivity 已提交
28

A
Avi Kivity 已提交
29
#include <asm/io.h>
A
Anthony Liguori 已提交
30
#include <asm/desc.h>
A
Avi Kivity 已提交
31 32 33 34

MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");

35 36 37 38 39 40 41
struct vmcs {
	u32 revision_id;
	u32 abort;
	char data[0];
};

struct vcpu_vmx {
R
Rusty Russell 已提交
42
	struct kvm_vcpu       vcpu;
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
	int                   launched;
	struct kvm_msr_entry *guest_msrs;
	struct kvm_msr_entry *host_msrs;
	int                   nmsrs;
	int                   save_nmsrs;
	int                   msr_offset_efer;
#ifdef CONFIG_X86_64
	int                   msr_offset_kernel_gs_base;
#endif
	struct vmcs          *vmcs;
	struct {
		int           loaded;
		u16           fs_sel, gs_sel, ldt_sel;
		int           fs_gs_ldt_reload_needed;
	}host_state;

};

static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
{
R
Rusty Russell 已提交
63
	return container_of(vcpu, struct vcpu_vmx, vcpu);
64 65
}

66 67
static int init_rmode_tss(struct kvm *kvm);

A
Avi Kivity 已提交
68 69 70
static DEFINE_PER_CPU(struct vmcs *, vmxarea);
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);

71 72 73
static struct page *vmx_io_bitmap_a;
static struct page *vmx_io_bitmap_b;

74
#define EFER_SAVE_RESTORE_BITS ((u64)EFER_SCE)
A
Avi Kivity 已提交
75

76
static struct vmcs_config {
A
Avi Kivity 已提交
77 78 79
	int size;
	int order;
	u32 revision_id;
80 81 82 83 84
	u32 pin_based_exec_ctrl;
	u32 cpu_based_exec_ctrl;
	u32 vmexit_ctrl;
	u32 vmentry_ctrl;
} vmcs_config;
A
Avi Kivity 已提交
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109

#define VMX_SEGMENT_FIELD(seg)					\
	[VCPU_SREG_##seg] = {                                   \
		.selector = GUEST_##seg##_SELECTOR,		\
		.base = GUEST_##seg##_BASE,		   	\
		.limit = GUEST_##seg##_LIMIT,		   	\
		.ar_bytes = GUEST_##seg##_AR_BYTES,	   	\
	}

static struct kvm_vmx_segment_field {
	unsigned selector;
	unsigned base;
	unsigned limit;
	unsigned ar_bytes;
} kvm_vmx_segment_fields[] = {
	VMX_SEGMENT_FIELD(CS),
	VMX_SEGMENT_FIELD(DS),
	VMX_SEGMENT_FIELD(ES),
	VMX_SEGMENT_FIELD(FS),
	VMX_SEGMENT_FIELD(GS),
	VMX_SEGMENT_FIELD(SS),
	VMX_SEGMENT_FIELD(TR),
	VMX_SEGMENT_FIELD(LDTR),
};

110 111 112 113
/*
 * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it
 * away by decrementing the array size.
 */
A
Avi Kivity 已提交
114
static const u32 vmx_msr_index[] = {
115
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
116 117 118 119
	MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
#endif
	MSR_EFER, MSR_K6_STAR,
};
120
#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
A
Avi Kivity 已提交
121

122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
static void load_msrs(struct kvm_msr_entry *e, int n)
{
	int i;

	for (i = 0; i < n; ++i)
		wrmsrl(e[i].index, e[i].data);
}

static void save_msrs(struct kvm_msr_entry *e, int n)
{
	int i;

	for (i = 0; i < n; ++i)
		rdmsrl(e[i].index, e[i].data);
}

static inline u64 msr_efer_save_restore_bits(struct kvm_msr_entry msr)
139 140 141 142 143 144
{
	return (u64)msr.data & EFER_SAVE_RESTORE_BITS;
}

static inline int msr_efer_need_save_restore(struct kvm_vcpu *vcpu)
{
145 146 147 148
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	int efer_offset = vmx->msr_offset_efer;
	return msr_efer_save_restore_bits(vmx->host_msrs[efer_offset]) !=
		msr_efer_save_restore_bits(vmx->guest_msrs[efer_offset]);
149 150
}

A
Avi Kivity 已提交
151 152 153 154 155 156 157
static inline int is_page_fault(u32 intr_info)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
			     INTR_INFO_VALID_MASK)) ==
		(INTR_TYPE_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
}

158 159 160 161 162 163 164
static inline int is_no_device(u32 intr_info)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
			     INTR_INFO_VALID_MASK)) ==
		(INTR_TYPE_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
}

A
Avi Kivity 已提交
165 166 167 168 169 170
static inline int is_external_interrupt(u32 intr_info)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
		== (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
}

171
static int __find_msr_index(struct kvm_vcpu *vcpu, u32 msr)
172
{
173
	struct vcpu_vmx *vmx = to_vmx(vcpu);
174 175
	int i;

176 177
	for (i = 0; i < vmx->nmsrs; ++i)
		if (vmx->guest_msrs[i].index == msr)
178 179 180 181
			return i;
	return -1;
}

182
static struct kvm_msr_entry *find_msr_entry(struct kvm_vcpu *vcpu, u32 msr)
183
{
184
	struct vcpu_vmx *vmx = to_vmx(vcpu);
185 186 187 188
	int i;

	i = __find_msr_index(vcpu, msr);
	if (i >= 0)
189
		return &vmx->guest_msrs[i];
A
Al Viro 已提交
190
	return NULL;
191 192
}

A
Avi Kivity 已提交
193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208
static void vmcs_clear(struct vmcs *vmcs)
{
	u64 phys_addr = __pa(vmcs);
	u8 error;

	asm volatile (ASM_VMX_VMCLEAR_RAX "; setna %0"
		      : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
		      : "cc", "memory");
	if (error)
		printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
		       vmcs, phys_addr);
}

static void __vcpu_clear(void *arg)
{
	struct kvm_vcpu *vcpu = arg;
209
	struct vcpu_vmx *vmx = to_vmx(vcpu);
210
	int cpu = raw_smp_processor_id();
A
Avi Kivity 已提交
211 212

	if (vcpu->cpu == cpu)
213 214
		vmcs_clear(vmx->vmcs);
	if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
A
Avi Kivity 已提交
215
		per_cpu(current_vmcs, cpu) = NULL;
216
	rdtscll(vcpu->host_tsc);
A
Avi Kivity 已提交
217 218
}

A
Avi Kivity 已提交
219 220 221 222 223 224
static void vcpu_clear(struct kvm_vcpu *vcpu)
{
	if (vcpu->cpu != raw_smp_processor_id() && vcpu->cpu != -1)
		smp_call_function_single(vcpu->cpu, __vcpu_clear, vcpu, 0, 1);
	else
		__vcpu_clear(vcpu);
225
	to_vmx(vcpu)->launched = 0;
A
Avi Kivity 已提交
226 227
}

A
Avi Kivity 已提交
228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248
static unsigned long vmcs_readl(unsigned long field)
{
	unsigned long value;

	asm volatile (ASM_VMX_VMREAD_RDX_RAX
		      : "=a"(value) : "d"(field) : "cc");
	return value;
}

static u16 vmcs_read16(unsigned long field)
{
	return vmcs_readl(field);
}

static u32 vmcs_read32(unsigned long field)
{
	return vmcs_readl(field);
}

static u64 vmcs_read64(unsigned long field)
{
249
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
250 251 252 253 254 255
	return vmcs_readl(field);
#else
	return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
#endif
}

256 257 258 259 260 261 262
static noinline void vmwrite_error(unsigned long field, unsigned long value)
{
	printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
	       field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
	dump_stack();
}

A
Avi Kivity 已提交
263 264 265 266 267 268
static void vmcs_writel(unsigned long field, unsigned long value)
{
	u8 error;

	asm volatile (ASM_VMX_VMWRITE_RAX_RDX "; setna %0"
		       : "=q"(error) : "a"(value), "d"(field) : "cc" );
269 270
	if (unlikely(error))
		vmwrite_error(field, value);
A
Avi Kivity 已提交
271 272 273 274 275 276 277 278 279 280 281 282 283 284
}

static void vmcs_write16(unsigned long field, u16 value)
{
	vmcs_writel(field, value);
}

static void vmcs_write32(unsigned long field, u32 value)
{
	vmcs_writel(field, value);
}

static void vmcs_write64(unsigned long field, u64 value)
{
285
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
286 287 288 289 290 291 292 293
	vmcs_writel(field, value);
#else
	vmcs_writel(field, value);
	asm volatile ("");
	vmcs_writel(field+1, value >> 32);
#endif
}

294 295 296 297 298 299 300 301 302 303
static void vmcs_clear_bits(unsigned long field, u32 mask)
{
	vmcs_writel(field, vmcs_readl(field) & ~mask);
}

static void vmcs_set_bits(unsigned long field, u32 mask)
{
	vmcs_writel(field, vmcs_readl(field) | mask);
}

304 305 306 307 308 309 310 311 312 313 314 315 316 317
static void update_exception_bitmap(struct kvm_vcpu *vcpu)
{
	u32 eb;

	eb = 1u << PF_VECTOR;
	if (!vcpu->fpu_active)
		eb |= 1u << NM_VECTOR;
	if (vcpu->guest_debug.enabled)
		eb |= 1u << 1;
	if (vcpu->rmode.active)
		eb = ~0;
	vmcs_write32(EXCEPTION_BITMAP, eb);
}

318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334
static void reload_tss(void)
{
#ifndef CONFIG_X86_64

	/*
	 * VT restores TR but not its size.  Useless.
	 */
	struct descriptor_table gdt;
	struct segment_descriptor *descs;

	get_gdt(&gdt);
	descs = (void *)gdt.base;
	descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
	load_TR_desc();
#endif
}

335 336 337
static void load_transition_efer(struct kvm_vcpu *vcpu)
{
	u64 trans_efer;
338 339
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	int efer_offset = vmx->msr_offset_efer;
340

341
	trans_efer = vmx->host_msrs[efer_offset].data;
342
	trans_efer &= ~EFER_SAVE_RESTORE_BITS;
343
	trans_efer |= msr_efer_save_restore_bits(vmx->guest_msrs[efer_offset]);
344 345 346 347
	wrmsrl(MSR_EFER, trans_efer);
	vcpu->stat.efer_reload++;
}

348 349
static void vmx_save_host_state(struct kvm_vcpu *vcpu)
{
350
	struct vcpu_vmx *vmx = to_vmx(vcpu);
351

352
	if (vmx->host_state.loaded)
353 354
		return;

355
	vmx->host_state.loaded = 1;
356 357 358 359
	/*
	 * Set host fs and gs selectors.  Unfortunately, 22.2.3 does not
	 * allow segment selectors with cpl > 0 or ti == 1.
	 */
360 361 362 363 364
	vmx->host_state.ldt_sel = read_ldt();
	vmx->host_state.fs_gs_ldt_reload_needed = vmx->host_state.ldt_sel;
	vmx->host_state.fs_sel = read_fs();
	if (!(vmx->host_state.fs_sel & 7))
		vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
365 366
	else {
		vmcs_write16(HOST_FS_SELECTOR, 0);
367
		vmx->host_state.fs_gs_ldt_reload_needed = 1;
368
	}
369 370 371
	vmx->host_state.gs_sel = read_gs();
	if (!(vmx->host_state.gs_sel & 7))
		vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
372 373
	else {
		vmcs_write16(HOST_GS_SELECTOR, 0);
374
		vmx->host_state.fs_gs_ldt_reload_needed = 1;
375 376 377 378 379 380
	}

#ifdef CONFIG_X86_64
	vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
	vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
#else
381 382
	vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
	vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
383
#endif
384 385 386

#ifdef CONFIG_X86_64
	if (is_long_mode(vcpu)) {
387 388
		save_msrs(vmx->host_msrs +
			  vmx->msr_offset_kernel_gs_base, 1);
389 390
	}
#endif
391
	load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
392 393
	if (msr_efer_need_save_restore(vcpu))
		load_transition_efer(vcpu);
394 395 396 397
}

static void vmx_load_host_state(struct kvm_vcpu *vcpu)
{
398
	struct vcpu_vmx *vmx = to_vmx(vcpu);
399
	unsigned long flags;
400

401
	if (!vmx->host_state.loaded)
402 403
		return;

404 405 406 407
	vmx->host_state.loaded = 0;
	if (vmx->host_state.fs_gs_ldt_reload_needed) {
		load_ldt(vmx->host_state.ldt_sel);
		load_fs(vmx->host_state.fs_sel);
408 409 410 411
		/*
		 * If we have to reload gs, we must take care to
		 * preserve our gs base.
		 */
412
		local_irq_save(flags);
413
		load_gs(vmx->host_state.gs_sel);
414 415 416
#ifdef CONFIG_X86_64
		wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
#endif
417
		local_irq_restore(flags);
418 419 420

		reload_tss();
	}
421 422
	save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
	load_msrs(vmx->host_msrs, vmx->save_nmsrs);
423
	if (msr_efer_need_save_restore(vcpu))
424
		load_msrs(vmx->host_msrs + vmx->msr_offset_efer, 1);
425 426
}

A
Avi Kivity 已提交
427 428 429 430
/*
 * Switches to specified vcpu, until a matching vcpu_put(), but assumes
 * vcpu mutex is already taken.
 */
431
static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
A
Avi Kivity 已提交
432
{
433 434
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	u64 phys_addr = __pa(vmx->vmcs);
435
	u64 tsc_this, delta;
A
Avi Kivity 已提交
436

A
Avi Kivity 已提交
437 438
	if (vcpu->cpu != cpu)
		vcpu_clear(vcpu);
A
Avi Kivity 已提交
439

440
	if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
A
Avi Kivity 已提交
441 442
		u8 error;

443
		per_cpu(current_vmcs, cpu) = vmx->vmcs;
A
Avi Kivity 已提交
444 445 446 447 448
		asm volatile (ASM_VMX_VMPTRLD_RAX "; setna %0"
			      : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
			      : "cc");
		if (error)
			printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
449
			       vmx->vmcs, phys_addr);
A
Avi Kivity 已提交
450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466
	}

	if (vcpu->cpu != cpu) {
		struct descriptor_table dt;
		unsigned long sysenter_esp;

		vcpu->cpu = cpu;
		/*
		 * Linux uses per-cpu TSS and GDT, so set these when switching
		 * processors.
		 */
		vmcs_writel(HOST_TR_BASE, read_tr_base()); /* 22.2.4 */
		get_gdt(&dt);
		vmcs_writel(HOST_GDTR_BASE, dt.base);   /* 22.2.4 */

		rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
		vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
467 468 469 470 471 472 473

		/*
		 * Make sure the time stamp counter is monotonous.
		 */
		rdtscll(tsc_this);
		delta = vcpu->host_tsc - tsc_this;
		vmcs_write64(TSC_OFFSET, vmcs_read64(TSC_OFFSET) + delta);
A
Avi Kivity 已提交
474 475 476 477 478
	}
}

static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
{
479
	vmx_load_host_state(vcpu);
480
	kvm_put_guest_fpu(vcpu);
A
Avi Kivity 已提交
481 482
}

483 484 485 486 487
static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
{
	if (vcpu->fpu_active)
		return;
	vcpu->fpu_active = 1;
488 489 490
	vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
	if (vcpu->cr0 & X86_CR0_TS)
		vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
491 492 493 494 495 496 497 498
	update_exception_bitmap(vcpu);
}

static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
{
	if (!vcpu->fpu_active)
		return;
	vcpu->fpu_active = 0;
499
	vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
500 501 502
	update_exception_bitmap(vcpu);
}

A
Avi Kivity 已提交
503 504 505 506 507
static void vmx_vcpu_decache(struct kvm_vcpu *vcpu)
{
	vcpu_clear(vcpu);
}

A
Avi Kivity 已提交
508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534
static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
{
	return vmcs_readl(GUEST_RFLAGS);
}

static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
	vmcs_writel(GUEST_RFLAGS, rflags);
}

static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
{
	unsigned long rip;
	u32 interruptibility;

	rip = vmcs_readl(GUEST_RIP);
	rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
	vmcs_writel(GUEST_RIP, rip);

	/*
	 * We emulated an instruction, so temporary interrupt blocking
	 * should be removed, if set.
	 */
	interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
	if (interruptibility & 3)
		vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
			     interruptibility & ~3);
535
	vcpu->interrupt_window_open = 1;
A
Avi Kivity 已提交
536 537 538 539 540 541 542 543 544 545 546 547 548 549
}

static void vmx_inject_gp(struct kvm_vcpu *vcpu, unsigned error_code)
{
	printk(KERN_DEBUG "inject_general_protection: rip 0x%lx\n",
	       vmcs_readl(GUEST_RIP));
	vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
		     GP_VECTOR |
		     INTR_TYPE_EXCEPTION |
		     INTR_INFO_DELIEVER_CODE_MASK |
		     INTR_INFO_VALID_MASK);
}

550 551 552 553 554
/*
 * Swap MSR entry in host/guest MSR entry array.
 */
void move_msr_up(struct kvm_vcpu *vcpu, int from, int to)
{
555 556 557 558 559 560 561 562 563
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	struct kvm_msr_entry tmp;

	tmp = vmx->guest_msrs[to];
	vmx->guest_msrs[to] = vmx->guest_msrs[from];
	vmx->guest_msrs[from] = tmp;
	tmp = vmx->host_msrs[to];
	vmx->host_msrs[to] = vmx->host_msrs[from];
	vmx->host_msrs[from] = tmp;
564 565
}

566 567 568 569 570 571 572
/*
 * Set up the vmcs to automatically save and restore system
 * msrs.  Don't touch the 64-bit msrs if the guest is in legacy
 * mode, as fiddling with msrs is very expensive.
 */
static void setup_msrs(struct kvm_vcpu *vcpu)
{
573
	struct vcpu_vmx *vmx = to_vmx(vcpu);
574
	int save_nmsrs;
575

576 577 578
	save_nmsrs = 0;
#ifdef CONFIG_X86_64
	if (is_long_mode(vcpu)) {
579 580
		int index;

581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601
		index = __find_msr_index(vcpu, MSR_SYSCALL_MASK);
		if (index >= 0)
			move_msr_up(vcpu, index, save_nmsrs++);
		index = __find_msr_index(vcpu, MSR_LSTAR);
		if (index >= 0)
			move_msr_up(vcpu, index, save_nmsrs++);
		index = __find_msr_index(vcpu, MSR_CSTAR);
		if (index >= 0)
			move_msr_up(vcpu, index, save_nmsrs++);
		index = __find_msr_index(vcpu, MSR_KERNEL_GS_BASE);
		if (index >= 0)
			move_msr_up(vcpu, index, save_nmsrs++);
		/*
		 * MSR_K6_STAR is only needed on long mode guests, and only
		 * if efer.sce is enabled.
		 */
		index = __find_msr_index(vcpu, MSR_K6_STAR);
		if ((index >= 0) && (vcpu->shadow_efer & EFER_SCE))
			move_msr_up(vcpu, index, save_nmsrs++);
	}
#endif
602
	vmx->save_nmsrs = save_nmsrs;
603

604
#ifdef CONFIG_X86_64
605
	vmx->msr_offset_kernel_gs_base =
606
		__find_msr_index(vcpu, MSR_KERNEL_GS_BASE);
607
#endif
608
	vmx->msr_offset_efer = __find_msr_index(vcpu, MSR_EFER);
609 610
}

A
Avi Kivity 已提交
611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
/*
 * reads and returns guest's timestamp counter "register"
 * guest_tsc = host_tsc + tsc_offset    -- 21.3
 */
static u64 guest_read_tsc(void)
{
	u64 host_tsc, tsc_offset;

	rdtscll(host_tsc);
	tsc_offset = vmcs_read64(TSC_OFFSET);
	return host_tsc + tsc_offset;
}

/*
 * writes 'guest_tsc' into guest's timestamp counter "register"
 * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
 */
static void guest_write_tsc(u64 guest_tsc)
{
	u64 host_tsc;

	rdtscll(host_tsc);
	vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
}

/*
 * Reads an msr value (of 'msr_index') into 'pdata'.
 * Returns 0 on success, non-0 otherwise.
 * Assumes vcpu_load() was already called.
 */
static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
{
	u64 data;
644
	struct kvm_msr_entry *msr;
A
Avi Kivity 已提交
645 646 647 648 649 650 651

	if (!pdata) {
		printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
		return -EINVAL;
	}

	switch (msr_index) {
652
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
653 654 655 656 657 658 659
	case MSR_FS_BASE:
		data = vmcs_readl(GUEST_FS_BASE);
		break;
	case MSR_GS_BASE:
		data = vmcs_readl(GUEST_GS_BASE);
		break;
	case MSR_EFER:
660
		return kvm_get_msr_common(vcpu, msr_index, pdata);
A
Avi Kivity 已提交
661 662 663 664 665 666 667 668
#endif
	case MSR_IA32_TIME_STAMP_COUNTER:
		data = guest_read_tsc();
		break;
	case MSR_IA32_SYSENTER_CS:
		data = vmcs_read32(GUEST_SYSENTER_CS);
		break;
	case MSR_IA32_SYSENTER_EIP:
A
Avi Kivity 已提交
669
		data = vmcs_readl(GUEST_SYSENTER_EIP);
A
Avi Kivity 已提交
670 671
		break;
	case MSR_IA32_SYSENTER_ESP:
A
Avi Kivity 已提交
672
		data = vmcs_readl(GUEST_SYSENTER_ESP);
A
Avi Kivity 已提交
673 674 675
		break;
	default:
		msr = find_msr_entry(vcpu, msr_index);
676 677 678
		if (msr) {
			data = msr->data;
			break;
A
Avi Kivity 已提交
679
		}
680
		return kvm_get_msr_common(vcpu, msr_index, pdata);
A
Avi Kivity 已提交
681 682 683 684 685 686 687 688 689 690 691 692 693
	}

	*pdata = data;
	return 0;
}

/*
 * Writes msr value into into the appropriate "register".
 * Returns 0 on success, non-0 otherwise.
 * Assumes vcpu_load() was already called.
 */
static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
{
694 695
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	struct kvm_msr_entry *msr;
696 697
	int ret = 0;

A
Avi Kivity 已提交
698
	switch (msr_index) {
699
#ifdef CONFIG_X86_64
700
	case MSR_EFER:
701
		ret = kvm_set_msr_common(vcpu, msr_index, data);
702
		if (vmx->host_state.loaded)
703 704
			load_transition_efer(vcpu);
		break;
A
Avi Kivity 已提交
705 706 707 708 709 710 711 712 713 714 715
	case MSR_FS_BASE:
		vmcs_writel(GUEST_FS_BASE, data);
		break;
	case MSR_GS_BASE:
		vmcs_writel(GUEST_GS_BASE, data);
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
		vmcs_write32(GUEST_SYSENTER_CS, data);
		break;
	case MSR_IA32_SYSENTER_EIP:
A
Avi Kivity 已提交
716
		vmcs_writel(GUEST_SYSENTER_EIP, data);
A
Avi Kivity 已提交
717 718
		break;
	case MSR_IA32_SYSENTER_ESP:
A
Avi Kivity 已提交
719
		vmcs_writel(GUEST_SYSENTER_ESP, data);
A
Avi Kivity 已提交
720
		break;
A
Avi Kivity 已提交
721
	case MSR_IA32_TIME_STAMP_COUNTER:
A
Avi Kivity 已提交
722 723 724 725
		guest_write_tsc(data);
		break;
	default:
		msr = find_msr_entry(vcpu, msr_index);
726 727
		if (msr) {
			msr->data = data;
728 729
			if (vmx->host_state.loaded)
				load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
730
			break;
A
Avi Kivity 已提交
731
		}
732
		ret = kvm_set_msr_common(vcpu, msr_index, data);
A
Avi Kivity 已提交
733 734
	}

735
	return ret;
A
Avi Kivity 已提交
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778
}

/*
 * Sync the rsp and rip registers into the vcpu structure.  This allows
 * registers to be accessed by indexing vcpu->regs.
 */
static void vcpu_load_rsp_rip(struct kvm_vcpu *vcpu)
{
	vcpu->regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
	vcpu->rip = vmcs_readl(GUEST_RIP);
}

/*
 * Syncs rsp and rip back into the vmcs.  Should be called after possible
 * modification.
 */
static void vcpu_put_rsp_rip(struct kvm_vcpu *vcpu)
{
	vmcs_writel(GUEST_RSP, vcpu->regs[VCPU_REGS_RSP]);
	vmcs_writel(GUEST_RIP, vcpu->rip);
}

static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
{
	unsigned long dr7 = 0x400;
	int old_singlestep;

	old_singlestep = vcpu->guest_debug.singlestep;

	vcpu->guest_debug.enabled = dbg->enabled;
	if (vcpu->guest_debug.enabled) {
		int i;

		dr7 |= 0x200;  /* exact */
		for (i = 0; i < 4; ++i) {
			if (!dbg->breakpoints[i].enabled)
				continue;
			vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
			dr7 |= 2 << (i*2);    /* global enable */
			dr7 |= 0 << (i*4+16); /* execution breakpoint */
		}

		vcpu->guest_debug.singlestep = dbg->singlestep;
779
	} else
A
Avi Kivity 已提交
780 781 782 783 784 785 786 787 788 789
		vcpu->guest_debug.singlestep = 0;

	if (old_singlestep && !vcpu->guest_debug.singlestep) {
		unsigned long flags;

		flags = vmcs_readl(GUEST_RFLAGS);
		flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
		vmcs_writel(GUEST_RFLAGS, flags);
	}

790
	update_exception_bitmap(vcpu);
A
Avi Kivity 已提交
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806
	vmcs_writel(GUEST_DR7, dr7);

	return 0;
}

static __init int cpu_has_kvm_support(void)
{
	unsigned long ecx = cpuid_ecx(1);
	return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */
}

static __init int vmx_disabled_by_bios(void)
{
	u64 msr;

	rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
807 808 809 810
	return (msr & (MSR_IA32_FEATURE_CONTROL_LOCKED |
		       MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
	    == MSR_IA32_FEATURE_CONTROL_LOCKED;
	/* locked but not enabled */
A
Avi Kivity 已提交
811 812
}

A
Avi Kivity 已提交
813
static void hardware_enable(void *garbage)
A
Avi Kivity 已提交
814 815 816 817 818 819
{
	int cpu = raw_smp_processor_id();
	u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
	u64 old;

	rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
820 821 822 823
	if ((old & (MSR_IA32_FEATURE_CONTROL_LOCKED |
		    MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
	    != (MSR_IA32_FEATURE_CONTROL_LOCKED |
		MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
A
Avi Kivity 已提交
824
		/* enable and lock */
825 826 827
		wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
		       MSR_IA32_FEATURE_CONTROL_LOCKED |
		       MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED);
828
	write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
A
Avi Kivity 已提交
829 830 831 832 833 834 835 836 837
	asm volatile (ASM_VMX_VMXON_RAX : : "a"(&phys_addr), "m"(phys_addr)
		      : "memory", "cc");
}

static void hardware_disable(void *garbage)
{
	asm volatile (ASM_VMX_VMXOFF : : : "cc");
}

838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
				      u32 msr, u32* result)
{
	u32 vmx_msr_low, vmx_msr_high;
	u32 ctl = ctl_min | ctl_opt;

	rdmsr(msr, vmx_msr_low, vmx_msr_high);

	ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
	ctl |= vmx_msr_low;  /* bit == 1 in low word  ==> must be one  */

	/* Ensure minimum (required) set of control bits are supported. */
	if (ctl_min & ~ctl)
		return -1;

	*result = ctl;
	return 0;
}

static __init int setup_vmcs_config(void)
A
Avi Kivity 已提交
858 859
{
	u32 vmx_msr_low, vmx_msr_high;
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897
	u32 min, opt;
	u32 _pin_based_exec_control = 0;
	u32 _cpu_based_exec_control = 0;
	u32 _vmexit_control = 0;
	u32 _vmentry_control = 0;

	min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
	opt = 0;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
				&_pin_based_exec_control) < 0)
		return -1;

	min = CPU_BASED_HLT_EXITING |
#ifdef CONFIG_X86_64
	      CPU_BASED_CR8_LOAD_EXITING |
	      CPU_BASED_CR8_STORE_EXITING |
#endif
	      CPU_BASED_USE_IO_BITMAPS |
	      CPU_BASED_MOV_DR_EXITING |
	      CPU_BASED_USE_TSC_OFFSETING;
	opt = 0;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
				&_cpu_based_exec_control) < 0)
		return -1;

	min = 0;
#ifdef CONFIG_X86_64
	min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
#endif
	opt = 0;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
				&_vmexit_control) < 0)
		return -1;

	min = opt = 0;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
				&_vmentry_control) < 0)
		return -1;
A
Avi Kivity 已提交
898

N
Nguyen Anh Quynh 已提交
899
	rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924

	/* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
	if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
		return -1;

#ifdef CONFIG_X86_64
	/* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
	if (vmx_msr_high & (1u<<16))
		return -1;
#endif

	/* Require Write-Back (WB) memory type for VMCS accesses. */
	if (((vmx_msr_high >> 18) & 15) != 6)
		return -1;

	vmcs_config.size = vmx_msr_high & 0x1fff;
	vmcs_config.order = get_order(vmcs_config.size);
	vmcs_config.revision_id = vmx_msr_low;

	vmcs_config.pin_based_exec_ctrl = _pin_based_exec_control;
	vmcs_config.cpu_based_exec_ctrl = _cpu_based_exec_control;
	vmcs_config.vmexit_ctrl         = _vmexit_control;
	vmcs_config.vmentry_ctrl        = _vmentry_control;

	return 0;
N
Nguyen Anh Quynh 已提交
925
}
A
Avi Kivity 已提交
926 927 928 929 930 931 932

static struct vmcs *alloc_vmcs_cpu(int cpu)
{
	int node = cpu_to_node(cpu);
	struct page *pages;
	struct vmcs *vmcs;

933
	pages = alloc_pages_node(node, GFP_KERNEL, vmcs_config.order);
A
Avi Kivity 已提交
934 935 936
	if (!pages)
		return NULL;
	vmcs = page_address(pages);
937 938
	memset(vmcs, 0, vmcs_config.size);
	vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
A
Avi Kivity 已提交
939 940 941 942 943
	return vmcs;
}

static struct vmcs *alloc_vmcs(void)
{
944
	return alloc_vmcs_cpu(raw_smp_processor_id());
A
Avi Kivity 已提交
945 946 947 948
}

static void free_vmcs(struct vmcs *vmcs)
{
949
	free_pages((unsigned long)vmcs, vmcs_config.order);
A
Avi Kivity 已提交
950 951
}

952
static void free_kvm_area(void)
A
Avi Kivity 已提交
953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981
{
	int cpu;

	for_each_online_cpu(cpu)
		free_vmcs(per_cpu(vmxarea, cpu));
}

extern struct vmcs *alloc_vmcs_cpu(int cpu);

static __init int alloc_kvm_area(void)
{
	int cpu;

	for_each_online_cpu(cpu) {
		struct vmcs *vmcs;

		vmcs = alloc_vmcs_cpu(cpu);
		if (!vmcs) {
			free_kvm_area();
			return -ENOMEM;
		}

		per_cpu(vmxarea, cpu) = vmcs;
	}
	return 0;
}

static __init int hardware_setup(void)
{
982 983
	if (setup_vmcs_config() < 0)
		return -1;
A
Avi Kivity 已提交
984 985 986 987 988 989 990 991 992 993 994 995
	return alloc_kvm_area();
}

static __exit void hardware_unsetup(void)
{
	free_kvm_area();
}

static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

996
	if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
A
Avi Kivity 已提交
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
		vmcs_write16(sf->selector, save->selector);
		vmcs_writel(sf->base, save->base);
		vmcs_write32(sf->limit, save->limit);
		vmcs_write32(sf->ar_bytes, save->ar);
	} else {
		u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
			<< AR_DPL_SHIFT;
		vmcs_write32(sf->ar_bytes, 0x93 | dpl);
	}
}

static void enter_pmode(struct kvm_vcpu *vcpu)
{
	unsigned long flags;

	vcpu->rmode.active = 0;

	vmcs_writel(GUEST_TR_BASE, vcpu->rmode.tr.base);
	vmcs_write32(GUEST_TR_LIMIT, vcpu->rmode.tr.limit);
	vmcs_write32(GUEST_TR_AR_BYTES, vcpu->rmode.tr.ar);

	flags = vmcs_readl(GUEST_RFLAGS);
	flags &= ~(IOPL_MASK | X86_EFLAGS_VM);
	flags |= (vcpu->rmode.save_iopl << IOPL_SHIFT);
	vmcs_writel(GUEST_RFLAGS, flags);

1023 1024
	vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
			(vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
A
Avi Kivity 已提交
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080

	update_exception_bitmap(vcpu);

	fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->rmode.es);
	fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->rmode.ds);
	fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->rmode.gs);
	fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->rmode.fs);

	vmcs_write16(GUEST_SS_SELECTOR, 0);
	vmcs_write32(GUEST_SS_AR_BYTES, 0x93);

	vmcs_write16(GUEST_CS_SELECTOR,
		     vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
	vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
}

static int rmode_tss_base(struct kvm* kvm)
{
	gfn_t base_gfn = kvm->memslots[0].base_gfn + kvm->memslots[0].npages - 3;
	return base_gfn << PAGE_SHIFT;
}

static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

	save->selector = vmcs_read16(sf->selector);
	save->base = vmcs_readl(sf->base);
	save->limit = vmcs_read32(sf->limit);
	save->ar = vmcs_read32(sf->ar_bytes);
	vmcs_write16(sf->selector, vmcs_readl(sf->base) >> 4);
	vmcs_write32(sf->limit, 0xffff);
	vmcs_write32(sf->ar_bytes, 0xf3);
}

static void enter_rmode(struct kvm_vcpu *vcpu)
{
	unsigned long flags;

	vcpu->rmode.active = 1;

	vcpu->rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
	vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));

	vcpu->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
	vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);

	vcpu->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
	vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);

	flags = vmcs_readl(GUEST_RFLAGS);
	vcpu->rmode.save_iopl = (flags & IOPL_MASK) >> IOPL_SHIFT;

	flags |= IOPL_MASK | X86_EFLAGS_VM;

	vmcs_writel(GUEST_RFLAGS, flags);
1081
	vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
A
Avi Kivity 已提交
1082 1083 1084 1085 1086 1087 1088
	update_exception_bitmap(vcpu);

	vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
	vmcs_write32(GUEST_SS_LIMIT, 0xffff);
	vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);

	vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
1089
	vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1090 1091
	if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
		vmcs_writel(GUEST_CS_BASE, 0xf0000);
A
Avi Kivity 已提交
1092 1093 1094 1095 1096 1097
	vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);

	fix_rmode_seg(VCPU_SREG_ES, &vcpu->rmode.es);
	fix_rmode_seg(VCPU_SREG_DS, &vcpu->rmode.ds);
	fix_rmode_seg(VCPU_SREG_GS, &vcpu->rmode.gs);
	fix_rmode_seg(VCPU_SREG_FS, &vcpu->rmode.fs);
1098 1099

	init_rmode_tss(vcpu->kvm);
A
Avi Kivity 已提交
1100 1101
}

1102
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135

static void enter_lmode(struct kvm_vcpu *vcpu)
{
	u32 guest_tr_ar;

	guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
	if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
		printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
		       __FUNCTION__);
		vmcs_write32(GUEST_TR_AR_BYTES,
			     (guest_tr_ar & ~AR_TYPE_MASK)
			     | AR_TYPE_BUSY_64_TSS);
	}

	vcpu->shadow_efer |= EFER_LMA;

	find_msr_entry(vcpu, MSR_EFER)->data |= EFER_LMA | EFER_LME;
	vmcs_write32(VM_ENTRY_CONTROLS,
		     vmcs_read32(VM_ENTRY_CONTROLS)
		     | VM_ENTRY_CONTROLS_IA32E_MASK);
}

static void exit_lmode(struct kvm_vcpu *vcpu)
{
	vcpu->shadow_efer &= ~EFER_LMA;

	vmcs_write32(VM_ENTRY_CONTROLS,
		     vmcs_read32(VM_ENTRY_CONTROLS)
		     & ~VM_ENTRY_CONTROLS_IA32E_MASK);
}

#endif

1136
static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1137 1138 1139 1140 1141
{
	vcpu->cr4 &= KVM_GUEST_CR4_MASK;
	vcpu->cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
}

A
Avi Kivity 已提交
1142 1143
static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
1144 1145
	vmx_fpu_deactivate(vcpu);

1146
	if (vcpu->rmode.active && (cr0 & X86_CR0_PE))
A
Avi Kivity 已提交
1147 1148
		enter_pmode(vcpu);

1149
	if (!vcpu->rmode.active && !(cr0 & X86_CR0_PE))
A
Avi Kivity 已提交
1150 1151
		enter_rmode(vcpu);

1152
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1153
	if (vcpu->shadow_efer & EFER_LME) {
1154
		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
A
Avi Kivity 已提交
1155
			enter_lmode(vcpu);
1156
		if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
A
Avi Kivity 已提交
1157 1158 1159 1160 1161 1162 1163 1164
			exit_lmode(vcpu);
	}
#endif

	vmcs_writel(CR0_READ_SHADOW, cr0);
	vmcs_writel(GUEST_CR0,
		    (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON);
	vcpu->cr0 = cr0;
1165

1166
	if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
1167
		vmx_fpu_activate(vcpu);
A
Avi Kivity 已提交
1168 1169 1170 1171 1172
}

static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
	vmcs_writel(GUEST_CR3, cr3);
1173
	if (vcpu->cr0 & X86_CR0_PE)
1174
		vmx_fpu_deactivate(vcpu);
A
Avi Kivity 已提交
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
}

static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
	vmcs_writel(CR4_READ_SHADOW, cr4);
	vmcs_writel(GUEST_CR4, cr4 | (vcpu->rmode.active ?
		    KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON));
	vcpu->cr4 = cr4;
}

1185
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1186 1187 1188

static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
1189
	struct kvm_msr_entry *msr = find_msr_entry(vcpu, MSR_EFER);
A
Avi Kivity 已提交
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204

	vcpu->shadow_efer = efer;
	if (efer & EFER_LMA) {
		vmcs_write32(VM_ENTRY_CONTROLS,
				     vmcs_read32(VM_ENTRY_CONTROLS) |
				     VM_ENTRY_CONTROLS_IA32E_MASK);
		msr->data = efer;

	} else {
		vmcs_write32(VM_ENTRY_CONTROLS,
				     vmcs_read32(VM_ENTRY_CONTROLS) &
				     ~VM_ENTRY_CONTROLS_IA32E_MASK);

		msr->data = efer & ~EFER_LME;
	}
1205
	setup_msrs(vcpu);
A
Avi Kivity 已提交
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
}

#endif

static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

	return vmcs_readl(sf->base);
}

static void vmx_get_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
	u32 ar;

	var->base = vmcs_readl(sf->base);
	var->limit = vmcs_read32(sf->limit);
	var->selector = vmcs_read16(sf->selector);
	ar = vmcs_read32(sf->ar_bytes);
	if (ar & AR_UNUSABLE_MASK)
		ar = 0;
	var->type = ar & 15;
	var->s = (ar >> 4) & 1;
	var->dpl = (ar >> 5) & 3;
	var->present = (ar >> 7) & 1;
	var->avl = (ar >> 12) & 1;
	var->l = (ar >> 13) & 1;
	var->db = (ar >> 14) & 1;
	var->g = (ar >> 15) & 1;
	var->unusable = (ar >> 16) & 1;
}

1240
static u32 vmx_segment_access_rights(struct kvm_segment *var)
A
Avi Kivity 已提交
1241 1242 1243
{
	u32 ar;

1244
	if (var->unusable)
A
Avi Kivity 已提交
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
		ar = 1 << 16;
	else {
		ar = var->type & 15;
		ar |= (var->s & 1) << 4;
		ar |= (var->dpl & 3) << 5;
		ar |= (var->present & 1) << 7;
		ar |= (var->avl & 1) << 12;
		ar |= (var->l & 1) << 13;
		ar |= (var->db & 1) << 14;
		ar |= (var->g & 1) << 15;
	}
1256 1257
	if (ar == 0) /* a 0 value means unusable */
		ar = AR_UNUSABLE_MASK;
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286

	return ar;
}

static void vmx_set_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
	u32 ar;

	if (vcpu->rmode.active && seg == VCPU_SREG_TR) {
		vcpu->rmode.tr.selector = var->selector;
		vcpu->rmode.tr.base = var->base;
		vcpu->rmode.tr.limit = var->limit;
		vcpu->rmode.tr.ar = vmx_segment_access_rights(var);
		return;
	}
	vmcs_writel(sf->base, var->base);
	vmcs_write32(sf->limit, var->limit);
	vmcs_write16(sf->selector, var->selector);
	if (vcpu->rmode.active && var->s) {
		/*
		 * Hack real-mode segments into vm86 compatibility.
		 */
		if (var->base == 0xffff0000 && var->selector == 0xf000)
			vmcs_writel(sf->base, 0xf0000);
		ar = 0xf3;
	} else
		ar = vmx_segment_access_rights(var);
A
Avi Kivity 已提交
1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327
	vmcs_write32(sf->ar_bytes, ar);
}

static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
{
	u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);

	*db = (ar >> 14) & 1;
	*l = (ar >> 13) & 1;
}

static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
{
	dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
	dt->base = vmcs_readl(GUEST_IDTR_BASE);
}

static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
{
	vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
	vmcs_writel(GUEST_IDTR_BASE, dt->base);
}

static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
{
	dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
	dt->base = vmcs_readl(GUEST_GDTR_BASE);
}

static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
{
	vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
	vmcs_writel(GUEST_GDTR_BASE, dt->base);
}

static int init_rmode_tss(struct kvm* kvm)
{
	struct page *p1, *p2, *p3;
	gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
	char *page;

A
Avi Kivity 已提交
1328 1329 1330
	p1 = gfn_to_page(kvm, fn++);
	p2 = gfn_to_page(kvm, fn++);
	p3 = gfn_to_page(kvm, fn);
A
Avi Kivity 已提交
1331 1332 1333 1334 1335 1336 1337

	if (!p1 || !p2 || !p3) {
		kvm_printf(kvm,"%s: gfn_to_page failed\n", __FUNCTION__);
		return 0;
	}

	page = kmap_atomic(p1, KM_USER0);
1338
	clear_page(page);
A
Avi Kivity 已提交
1339 1340 1341 1342
	*(u16*)(page + 0x66) = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
	kunmap_atomic(page, KM_USER0);

	page = kmap_atomic(p2, KM_USER0);
1343
	clear_page(page);
A
Avi Kivity 已提交
1344 1345 1346
	kunmap_atomic(page, KM_USER0);

	page = kmap_atomic(p3, KM_USER0);
1347
	clear_page(page);
A
Avi Kivity 已提交
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
	*(page + RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1) = ~0;
	kunmap_atomic(page, KM_USER0);

	return 1;
}

static void seg_setup(int seg)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

	vmcs_write16(sf->selector, 0);
	vmcs_writel(sf->base, 0);
	vmcs_write32(sf->limit, 0xffff);
	vmcs_write32(sf->ar_bytes, 0x93);
}

/*
 * Sets up the vmcs for emulated real mode.
 */
static int vmx_vcpu_setup(struct kvm_vcpu *vcpu)
{
1369
	struct vcpu_vmx *vmx = to_vmx(vcpu);
A
Avi Kivity 已提交
1370 1371 1372 1373 1374 1375
	u32 host_sysenter_cs;
	u32 junk;
	unsigned long a;
	struct descriptor_table dt;
	int i;
	int ret = 0;
1376
	unsigned long kvm_vmx_return;
A
Avi Kivity 已提交
1377 1378 1379 1380 1381 1382 1383 1384 1385

	if (!init_rmode_tss(vcpu->kvm)) {
		ret = -ENOMEM;
		goto out;
	}

	memset(vcpu->regs, 0, sizeof(vcpu->regs));
	vcpu->regs[VCPU_REGS_RDX] = get_rdx_init_val();
	vcpu->cr8 = 0;
1386
	vcpu->apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
1387
	if (vcpu->vcpu_id == 0)
1388
		vcpu->apic_base |= MSR_IA32_APICBASE_BSP;
A
Avi Kivity 已提交
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438

	fx_init(vcpu);

	/*
	 * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
	 * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4.  Sigh.
	 */
	vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
	vmcs_writel(GUEST_CS_BASE, 0x000f0000);
	vmcs_write32(GUEST_CS_LIMIT, 0xffff);
	vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);

	seg_setup(VCPU_SREG_DS);
	seg_setup(VCPU_SREG_ES);
	seg_setup(VCPU_SREG_FS);
	seg_setup(VCPU_SREG_GS);
	seg_setup(VCPU_SREG_SS);

	vmcs_write16(GUEST_TR_SELECTOR, 0);
	vmcs_writel(GUEST_TR_BASE, 0);
	vmcs_write32(GUEST_TR_LIMIT, 0xffff);
	vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);

	vmcs_write16(GUEST_LDTR_SELECTOR, 0);
	vmcs_writel(GUEST_LDTR_BASE, 0);
	vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
	vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);

	vmcs_write32(GUEST_SYSENTER_CS, 0);
	vmcs_writel(GUEST_SYSENTER_ESP, 0);
	vmcs_writel(GUEST_SYSENTER_EIP, 0);

	vmcs_writel(GUEST_RFLAGS, 0x02);
	vmcs_writel(GUEST_RIP, 0xfff0);
	vmcs_writel(GUEST_RSP, 0);

	//todo: dr0 = dr1 = dr2 = dr3 = 0; dr6 = 0xffff0ff0
	vmcs_writel(GUEST_DR7, 0x400);

	vmcs_writel(GUEST_GDTR_BASE, 0);
	vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);

	vmcs_writel(GUEST_IDTR_BASE, 0);
	vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);

	vmcs_write32(GUEST_ACTIVITY_STATE, 0);
	vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
	vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);

	/* I/O */
1439 1440
	vmcs_write64(IO_BITMAP_A, page_to_phys(vmx_io_bitmap_a));
	vmcs_write64(IO_BITMAP_B, page_to_phys(vmx_io_bitmap_b));
A
Avi Kivity 已提交
1441 1442 1443 1444 1445 1446 1447 1448 1449

	guest_write_tsc(0);

	vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */

	/* Special registers */
	vmcs_write64(GUEST_IA32_DEBUGCTL, 0);

	/* Control */
1450 1451 1452 1453
	vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
		vmcs_config.pin_based_exec_ctrl);
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
		vmcs_config.cpu_based_exec_ctrl);
A
Avi Kivity 已提交
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468

	vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
	vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
	vmcs_write32(CR3_TARGET_COUNT, 0);           /* 22.2.1 */

	vmcs_writel(HOST_CR0, read_cr0());  /* 22.2.3 */
	vmcs_writel(HOST_CR4, read_cr4());  /* 22.2.3, 22.2.5 */
	vmcs_writel(HOST_CR3, read_cr3());  /* 22.2.3  FIXME: shadow tables */

	vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS);  /* 22.2.4 */
	vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
	vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
	vmcs_write16(HOST_FS_SELECTOR, read_fs());    /* 22.2.4 */
	vmcs_write16(HOST_GS_SELECTOR, read_gs());    /* 22.2.4 */
	vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
1469
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483
	rdmsrl(MSR_FS_BASE, a);
	vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
	rdmsrl(MSR_GS_BASE, a);
	vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
#else
	vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
	vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
#endif

	vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8);  /* 22.2.4 */

	get_idt(&dt);
	vmcs_writel(HOST_IDTR_BASE, dt.base);   /* 22.2.4 */

1484 1485
	asm ("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
	vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
1486 1487 1488
	vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
	vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
A
Avi Kivity 已提交
1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500

	rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
	vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
	rdmsrl(MSR_IA32_SYSENTER_ESP, a);
	vmcs_writel(HOST_IA32_SYSENTER_ESP, a);   /* 22.2.3 */
	rdmsrl(MSR_IA32_SYSENTER_EIP, a);
	vmcs_writel(HOST_IA32_SYSENTER_EIP, a);   /* 22.2.3 */

	for (i = 0; i < NR_VMX_MSR; ++i) {
		u32 index = vmx_msr_index[i];
		u32 data_low, data_high;
		u64 data;
1501
		int j = vmx->nmsrs;
A
Avi Kivity 已提交
1502 1503 1504

		if (rdmsr_safe(index, &data_low, &data_high) < 0)
			continue;
1505 1506
		if (wrmsr_safe(index, data_low, data_high) < 0)
			continue;
A
Avi Kivity 已提交
1507
		data = data_low | ((u64)data_high << 32);
1508 1509 1510 1511 1512
		vmx->host_msrs[j].index = index;
		vmx->host_msrs[j].reserved = 0;
		vmx->host_msrs[j].data = data;
		vmx->guest_msrs[j] = vmx->host_msrs[j];
		++vmx->nmsrs;
A
Avi Kivity 已提交
1513 1514
	}

1515 1516
	setup_msrs(vcpu);

1517
	vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
A
Avi Kivity 已提交
1518 1519

	/* 22.2.1, 20.8.1 */
1520 1521
	vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);

A
Avi Kivity 已提交
1522 1523
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */

1524
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1525 1526
	vmcs_writel(VIRTUAL_APIC_PAGE_ADDR, 0);
	vmcs_writel(TPR_THRESHOLD, 0);
1527
#endif
A
Avi Kivity 已提交
1528

1529
	vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
A
Avi Kivity 已提交
1530 1531 1532 1533 1534
	vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);

	vcpu->cr0 = 0x60000010;
	vmx_set_cr0(vcpu, vcpu->cr0); // enter rmode
	vmx_set_cr4(vcpu, 0);
1535
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1536 1537
	vmx_set_efer(vcpu, 0);
#endif
1538
	vmx_fpu_activate(vcpu);
1539
	update_exception_bitmap(vcpu);
A
Avi Kivity 已提交
1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556

	return 0;

out:
	return ret;
}

static void inject_rmode_irq(struct kvm_vcpu *vcpu, int irq)
{
	u16 ent[2];
	u16 cs;
	u16 ip;
	unsigned long flags;
	unsigned long ss_base = vmcs_readl(GUEST_SS_BASE);
	u16 sp =  vmcs_readl(GUEST_RSP);
	u32 ss_limit = vmcs_read32(GUEST_SS_LIMIT);

1557
	if (sp > ss_limit || sp < 6 ) {
A
Avi Kivity 已提交
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
		vcpu_printf(vcpu, "%s: #SS, rsp 0x%lx ss 0x%lx limit 0x%x\n",
			    __FUNCTION__,
			    vmcs_readl(GUEST_RSP),
			    vmcs_readl(GUEST_SS_BASE),
			    vmcs_read32(GUEST_SS_LIMIT));
		return;
	}

	if (kvm_read_guest(vcpu, irq * sizeof(ent), sizeof(ent), &ent) !=
								sizeof(ent)) {
		vcpu_printf(vcpu, "%s: read guest err\n", __FUNCTION__);
		return;
	}

	flags =  vmcs_readl(GUEST_RFLAGS);
	cs =  vmcs_readl(GUEST_CS_BASE) >> 4;
	ip =  vmcs_readl(GUEST_RIP);


	if (kvm_write_guest(vcpu, ss_base + sp - 2, 2, &flags) != 2 ||
	    kvm_write_guest(vcpu, ss_base + sp - 4, 2, &cs) != 2 ||
	    kvm_write_guest(vcpu, ss_base + sp - 6, 2, &ip) != 2) {
		vcpu_printf(vcpu, "%s: write guest err\n", __FUNCTION__);
		return;
	}

	vmcs_writel(GUEST_RFLAGS, flags &
		    ~( X86_EFLAGS_IF | X86_EFLAGS_AC | X86_EFLAGS_TF));
	vmcs_write16(GUEST_CS_SELECTOR, ent[1]) ;
	vmcs_writel(GUEST_CS_BASE, ent[1] << 4);
	vmcs_writel(GUEST_RIP, ent[0]);
	vmcs_writel(GUEST_RSP, (vmcs_readl(GUEST_RSP) & ~0xffff) | (sp - 6));
}

static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
{
	int word_index = __ffs(vcpu->irq_summary);
	int bit_index = __ffs(vcpu->irq_pending[word_index]);
	int irq = word_index * BITS_PER_LONG + bit_index;

	clear_bit(bit_index, &vcpu->irq_pending[word_index]);
	if (!vcpu->irq_pending[word_index])
		clear_bit(word_index, &vcpu->irq_summary);

	if (vcpu->rmode.active) {
		inject_rmode_irq(vcpu, irq);
		return;
	}
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
}

1610 1611 1612

static void do_interrupt_requests(struct kvm_vcpu *vcpu,
				       struct kvm_run *kvm_run)
A
Avi Kivity 已提交
1613
{
1614 1615 1616 1617 1618 1619 1620 1621 1622
	u32 cpu_based_vm_exec_control;

	vcpu->interrupt_window_open =
		((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
		 (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);

	if (vcpu->interrupt_window_open &&
	    vcpu->irq_summary &&
	    !(vmcs_read32(VM_ENTRY_INTR_INFO_FIELD) & INTR_INFO_VALID_MASK))
A
Avi Kivity 已提交
1623
		/*
1624
		 * If interrupts enabled, and not blocked by sti or mov ss. Good.
A
Avi Kivity 已提交
1625 1626
		 */
		kvm_do_inject_irq(vcpu);
1627 1628 1629 1630

	cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
	if (!vcpu->interrupt_window_open &&
	    (vcpu->irq_summary || kvm_run->request_interrupt_window))
A
Avi Kivity 已提交
1631 1632 1633
		/*
		 * Interrupts blocked.  Wait for unblock.
		 */
1634 1635 1636 1637
		cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
	else
		cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
A
Avi Kivity 已提交
1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663
}

static void kvm_guest_debug_pre(struct kvm_vcpu *vcpu)
{
	struct kvm_guest_debug *dbg = &vcpu->guest_debug;

	set_debugreg(dbg->bp[0], 0);
	set_debugreg(dbg->bp[1], 1);
	set_debugreg(dbg->bp[2], 2);
	set_debugreg(dbg->bp[3], 3);

	if (dbg->singlestep) {
		unsigned long flags;

		flags = vmcs_readl(GUEST_RFLAGS);
		flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
		vmcs_writel(GUEST_RFLAGS, flags);
	}
}

static int handle_rmode_exception(struct kvm_vcpu *vcpu,
				  int vec, u32 err_code)
{
	if (!vcpu->rmode.active)
		return 0;

1664 1665 1666 1667 1668
	/*
	 * Instruction with address size override prefix opcode 0x67
	 * Cause the #SS fault with 0 error code in VM86 mode.
	 */
	if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
A
Avi Kivity 已提交
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
		if (emulate_instruction(vcpu, NULL, 0, 0) == EMULATE_DONE)
			return 1;
	return 0;
}

static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u32 intr_info, error_code;
	unsigned long cr2, rip;
	u32 vect_info;
	enum emulation_result er;
1680
	int r;
A
Avi Kivity 已提交
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700

	vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
	intr_info = vmcs_read32(VM_EXIT_INTR_INFO);

	if ((vect_info & VECTORING_INFO_VALID_MASK) &&
						!is_page_fault(intr_info)) {
		printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
		       "intr info 0x%x\n", __FUNCTION__, vect_info, intr_info);
	}

	if (is_external_interrupt(vect_info)) {
		int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
		set_bit(irq, vcpu->irq_pending);
		set_bit(irq / BITS_PER_LONG, &vcpu->irq_summary);
	}

	if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */
		asm ("int $2");
		return 1;
	}
1701 1702

	if (is_no_device(intr_info)) {
1703
		vmx_fpu_activate(vcpu);
1704 1705 1706
		return 1;
	}

A
Avi Kivity 已提交
1707 1708 1709 1710 1711 1712 1713
	error_code = 0;
	rip = vmcs_readl(GUEST_RIP);
	if (intr_info & INTR_INFO_DELIEVER_CODE_MASK)
		error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
	if (is_page_fault(intr_info)) {
		cr2 = vmcs_readl(EXIT_QUALIFICATION);

S
Shaohua Li 已提交
1714
		mutex_lock(&vcpu->kvm->lock);
1715 1716
		r = kvm_mmu_page_fault(vcpu, cr2, error_code);
		if (r < 0) {
S
Shaohua Li 已提交
1717
			mutex_unlock(&vcpu->kvm->lock);
1718 1719 1720
			return r;
		}
		if (!r) {
S
Shaohua Li 已提交
1721
			mutex_unlock(&vcpu->kvm->lock);
A
Avi Kivity 已提交
1722 1723 1724 1725
			return 1;
		}

		er = emulate_instruction(vcpu, kvm_run, cr2, error_code);
S
Shaohua Li 已提交
1726
		mutex_unlock(&vcpu->kvm->lock);
A
Avi Kivity 已提交
1727 1728 1729 1730 1731

		switch (er) {
		case EMULATE_DONE:
			return 1;
		case EMULATE_DO_MMIO:
A
Avi Kivity 已提交
1732
			++vcpu->stat.mmio_exits;
A
Avi Kivity 已提交
1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743
			return 0;
		 case EMULATE_FAIL:
			vcpu_printf(vcpu, "%s: emulate fail\n", __FUNCTION__);
			break;
		default:
			BUG();
		}
	}

	if (vcpu->rmode.active &&
	    handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
1744 1745 1746 1747 1748
								error_code)) {
		if (vcpu->halt_request) {
			vcpu->halt_request = 0;
			return kvm_emulate_halt(vcpu);
		}
A
Avi Kivity 已提交
1749
		return 1;
1750
	}
A
Avi Kivity 已提交
1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764

	if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) == (INTR_TYPE_EXCEPTION | 1)) {
		kvm_run->exit_reason = KVM_EXIT_DEBUG;
		return 0;
	}
	kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
	kvm_run->ex.exception = intr_info & INTR_INFO_VECTOR_MASK;
	kvm_run->ex.error_code = error_code;
	return 0;
}

static int handle_external_interrupt(struct kvm_vcpu *vcpu,
				     struct kvm_run *kvm_run)
{
A
Avi Kivity 已提交
1765
	++vcpu->stat.irq_exits;
A
Avi Kivity 已提交
1766 1767 1768
	return 1;
}

1769 1770 1771 1772 1773
static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
	return 0;
}
A
Avi Kivity 已提交
1774

1775
static int get_io_count(struct kvm_vcpu *vcpu, unsigned long *count)
A
Avi Kivity 已提交
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819
{
	u64 inst;
	gva_t rip;
	int countr_size;
	int i, n;

	if ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_VM)) {
		countr_size = 2;
	} else {
		u32 cs_ar = vmcs_read32(GUEST_CS_AR_BYTES);

		countr_size = (cs_ar & AR_L_MASK) ? 8:
			      (cs_ar & AR_DB_MASK) ? 4: 2;
	}

	rip =  vmcs_readl(GUEST_RIP);
	if (countr_size != 8)
		rip += vmcs_readl(GUEST_CS_BASE);

	n = kvm_read_guest(vcpu, rip, sizeof(inst), &inst);

	for (i = 0; i < n; i++) {
		switch (((u8*)&inst)[i]) {
		case 0xf0:
		case 0xf2:
		case 0xf3:
		case 0x2e:
		case 0x36:
		case 0x3e:
		case 0x26:
		case 0x64:
		case 0x65:
		case 0x66:
			break;
		case 0x67:
			countr_size = (countr_size == 2) ? 4: (countr_size >> 1);
		default:
			goto done;
		}
	}
	return 0;
done:
	countr_size *= 8;
	*count = vcpu->regs[VCPU_REGS_RCX] & (~0ULL >> (64 - countr_size));
1820
	//printk("cx: %lx\n", vcpu->regs[VCPU_REGS_RCX]);
A
Avi Kivity 已提交
1821 1822 1823 1824 1825 1826
	return 1;
}

static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u64 exit_qualification;
1827 1828 1829 1830
	int size, down, in, string, rep;
	unsigned port;
	unsigned long count;
	gva_t address;
A
Avi Kivity 已提交
1831

A
Avi Kivity 已提交
1832
	++vcpu->stat.io_exits;
A
Avi Kivity 已提交
1833
	exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
	in = (exit_qualification & 8) != 0;
	size = (exit_qualification & 7) + 1;
	string = (exit_qualification & 16) != 0;
	down = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
	count = 1;
	rep = (exit_qualification & 32) != 0;
	port = exit_qualification >> 16;
	address = 0;
	if (string) {
		if (rep && !get_io_count(vcpu, &count))
A
Avi Kivity 已提交
1844
			return 1;
1845 1846 1847 1848
		address = vmcs_readl(GUEST_LINEAR_ADDRESS);
	}
	return kvm_setup_pio(vcpu, kvm_run, in, size, count, string, down,
			     address, rep, port);
A
Avi Kivity 已提交
1849 1850
}

I
Ingo Molnar 已提交
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862
static void
vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
{
	/*
	 * Patch in the VMCALL instruction:
	 */
	hypercall[0] = 0x0f;
	hypercall[1] = 0x01;
	hypercall[2] = 0xc1;
	hypercall[3] = 0xc3;
}

A
Avi Kivity 已提交
1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896
static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u64 exit_qualification;
	int cr;
	int reg;

	exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
	cr = exit_qualification & 15;
	reg = (exit_qualification >> 8) & 15;
	switch ((exit_qualification >> 4) & 3) {
	case 0: /* mov to cr */
		switch (cr) {
		case 0:
			vcpu_load_rsp_rip(vcpu);
			set_cr0(vcpu, vcpu->regs[reg]);
			skip_emulated_instruction(vcpu);
			return 1;
		case 3:
			vcpu_load_rsp_rip(vcpu);
			set_cr3(vcpu, vcpu->regs[reg]);
			skip_emulated_instruction(vcpu);
			return 1;
		case 4:
			vcpu_load_rsp_rip(vcpu);
			set_cr4(vcpu, vcpu->regs[reg]);
			skip_emulated_instruction(vcpu);
			return 1;
		case 8:
			vcpu_load_rsp_rip(vcpu);
			set_cr8(vcpu, vcpu->regs[reg]);
			skip_emulated_instruction(vcpu);
			return 1;
		};
		break;
1897 1898
	case 2: /* clts */
		vcpu_load_rsp_rip(vcpu);
1899
		vmx_fpu_deactivate(vcpu);
1900
		vcpu->cr0 &= ~X86_CR0_TS;
1901
		vmcs_writel(CR0_READ_SHADOW, vcpu->cr0);
1902
		vmx_fpu_activate(vcpu);
1903 1904
		skip_emulated_instruction(vcpu);
		return 1;
A
Avi Kivity 已提交
1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971
	case 1: /*mov from cr*/
		switch (cr) {
		case 3:
			vcpu_load_rsp_rip(vcpu);
			vcpu->regs[reg] = vcpu->cr3;
			vcpu_put_rsp_rip(vcpu);
			skip_emulated_instruction(vcpu);
			return 1;
		case 8:
			vcpu_load_rsp_rip(vcpu);
			vcpu->regs[reg] = vcpu->cr8;
			vcpu_put_rsp_rip(vcpu);
			skip_emulated_instruction(vcpu);
			return 1;
		}
		break;
	case 3: /* lmsw */
		lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);

		skip_emulated_instruction(vcpu);
		return 1;
	default:
		break;
	}
	kvm_run->exit_reason = 0;
	printk(KERN_ERR "kvm: unhandled control register: op %d cr %d\n",
	       (int)(exit_qualification >> 4) & 3, cr);
	return 0;
}

static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u64 exit_qualification;
	unsigned long val;
	int dr, reg;

	/*
	 * FIXME: this code assumes the host is debugging the guest.
	 *        need to deal with guest debugging itself too.
	 */
	exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
	dr = exit_qualification & 7;
	reg = (exit_qualification >> 8) & 15;
	vcpu_load_rsp_rip(vcpu);
	if (exit_qualification & 16) {
		/* mov from dr */
		switch (dr) {
		case 6:
			val = 0xffff0ff0;
			break;
		case 7:
			val = 0x400;
			break;
		default:
			val = 0;
		}
		vcpu->regs[reg] = val;
	} else {
		/* mov to dr */
	}
	vcpu_put_rsp_rip(vcpu);
	skip_emulated_instruction(vcpu);
	return 1;
}

static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
1972 1973
	kvm_emulate_cpuid(vcpu);
	return 1;
A
Avi Kivity 已提交
1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
}

static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u32 ecx = vcpu->regs[VCPU_REGS_RCX];
	u64 data;

	if (vmx_get_msr(vcpu, ecx, &data)) {
		vmx_inject_gp(vcpu, 0);
		return 1;
	}

	/* FIXME: handling of bits 32:63 of rax, rdx */
	vcpu->regs[VCPU_REGS_RAX] = data & -1u;
	vcpu->regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
	skip_emulated_instruction(vcpu);
	return 1;
}

static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u32 ecx = vcpu->regs[VCPU_REGS_RCX];
	u64 data = (vcpu->regs[VCPU_REGS_RAX] & -1u)
		| ((u64)(vcpu->regs[VCPU_REGS_RDX] & -1u) << 32);

	if (vmx_set_msr(vcpu, ecx, data) != 0) {
		vmx_inject_gp(vcpu, 0);
		return 1;
	}

	skip_emulated_instruction(vcpu);
	return 1;
}

2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
static void post_kvm_run_save(struct kvm_vcpu *vcpu,
			      struct kvm_run *kvm_run)
{
	kvm_run->if_flag = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) != 0;
	kvm_run->cr8 = vcpu->cr8;
	kvm_run->apic_base = vcpu->apic_base;
	kvm_run->ready_for_interrupt_injection = (vcpu->interrupt_window_open &&
						  vcpu->irq_summary == 0);
}

A
Avi Kivity 已提交
2018 2019 2020
static int handle_interrupt_window(struct kvm_vcpu *vcpu,
				   struct kvm_run *kvm_run)
{
2021 2022 2023 2024 2025
	/*
	 * If the user space waits to inject interrupts, exit as soon as
	 * possible
	 */
	if (kvm_run->request_interrupt_window &&
2026
	    !vcpu->irq_summary) {
2027
		kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
A
Avi Kivity 已提交
2028
		++vcpu->stat.irq_window_exits;
2029 2030
		return 0;
	}
A
Avi Kivity 已提交
2031 2032 2033 2034 2035 2036
	return 1;
}

static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	skip_emulated_instruction(vcpu);
2037
	return kvm_emulate_halt(vcpu);
A
Avi Kivity 已提交
2038 2039
}

2040 2041
static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2042
	skip_emulated_instruction(vcpu);
2043
	return kvm_hypercall(vcpu, kvm_run);
2044 2045
}

A
Avi Kivity 已提交
2046 2047 2048 2049 2050 2051 2052 2053 2054
/*
 * The exit handlers return 1 if the exit was handled fully and guest execution
 * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
 * to be done to userspace and return 0.
 */
static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
				      struct kvm_run *kvm_run) = {
	[EXIT_REASON_EXCEPTION_NMI]           = handle_exception,
	[EXIT_REASON_EXTERNAL_INTERRUPT]      = handle_external_interrupt,
2055
	[EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
A
Avi Kivity 已提交
2056 2057 2058 2059 2060 2061 2062 2063
	[EXIT_REASON_IO_INSTRUCTION]          = handle_io,
	[EXIT_REASON_CR_ACCESS]               = handle_cr,
	[EXIT_REASON_DR_ACCESS]               = handle_dr,
	[EXIT_REASON_CPUID]                   = handle_cpuid,
	[EXIT_REASON_MSR_READ]                = handle_rdmsr,
	[EXIT_REASON_MSR_WRITE]               = handle_wrmsr,
	[EXIT_REASON_PENDING_INTERRUPT]       = handle_interrupt_window,
	[EXIT_REASON_HLT]                     = handle_halt,
2064
	[EXIT_REASON_VMCALL]                  = handle_vmcall,
A
Avi Kivity 已提交
2065 2066 2067
};

static const int kvm_vmx_max_exit_handlers =
2068
	ARRAY_SIZE(kvm_vmx_exit_handlers);
A
Avi Kivity 已提交
2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092

/*
 * The guest has exited.  See if we can fix it or if we need userspace
 * assistance.
 */
static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
	u32 vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
	u32 exit_reason = vmcs_read32(VM_EXIT_REASON);

	if ( (vectoring_info & VECTORING_INFO_VALID_MASK) &&
				exit_reason != EXIT_REASON_EXCEPTION_NMI )
		printk(KERN_WARNING "%s: unexpected, valid vectoring info and "
		       "exit reason is 0x%x\n", __FUNCTION__, exit_reason);
	if (exit_reason < kvm_vmx_max_exit_handlers
	    && kvm_vmx_exit_handlers[exit_reason])
		return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
	else {
		kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
		kvm_run->hw.hardware_exit_reason = exit_reason;
	}
	return 0;
}

2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
/*
 * Check if userspace requested an interrupt window, and that the
 * interrupt window is open.
 *
 * No need to exit to userspace if we already have an interrupt queued.
 */
static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
					  struct kvm_run *kvm_run)
{
	return (!vcpu->irq_summary &&
		kvm_run->request_interrupt_window &&
		vcpu->interrupt_window_open &&
		(vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF));
}

2108 2109 2110 2111
static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
{
}

A
Avi Kivity 已提交
2112 2113
static int vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2114
	struct vcpu_vmx *vmx = to_vmx(vcpu);
A
Avi Kivity 已提交
2115
	u8 fail;
2116
	int r;
A
Avi Kivity 已提交
2117

2118
preempted:
A
Avi Kivity 已提交
2119 2120 2121
	if (vcpu->guest_debug.enabled)
		kvm_guest_debug_pre(vcpu);

2122
again:
2123 2124 2125 2126
	r = kvm_mmu_reload(vcpu);
	if (unlikely(r))
		goto out;

2127 2128
	preempt_disable();

2129 2130 2131
	if (!vcpu->mmio_read_completed)
		do_interrupt_requests(vcpu, kvm_run);

2132
	vmx_save_host_state(vcpu);
2133 2134 2135 2136 2137 2138 2139
	kvm_load_guest_fpu(vcpu);

	/*
	 * Loading guest fpu may have cleared host cr0.ts
	 */
	vmcs_writel(HOST_CR0, read_cr0());

2140 2141 2142 2143 2144 2145 2146
	local_irq_disable();

	vcpu->guest_mode = 1;
	if (vcpu->requests)
		if (test_and_clear_bit(KVM_TLB_FLUSH, &vcpu->requests))
		    vmx_flush_tlb(vcpu);

A
Avi Kivity 已提交
2147 2148
	asm (
		/* Store host registers */
2149
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
		"push %%rax; push %%rbx; push %%rdx;"
		"push %%rsi; push %%rdi; push %%rbp;"
		"push %%r8;  push %%r9;  push %%r10; push %%r11;"
		"push %%r12; push %%r13; push %%r14; push %%r15;"
		"push %%rcx \n\t"
		ASM_VMX_VMWRITE_RSP_RDX "\n\t"
#else
		"pusha; push %%ecx \n\t"
		ASM_VMX_VMWRITE_RSP_RDX "\n\t"
#endif
		/* Check if vmlaunch of vmresume is needed */
		"cmp $0, %1 \n\t"
		/* Load guest registers.  Don't clobber flags. */
2163
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192
		"mov %c[cr2](%3), %%rax \n\t"
		"mov %%rax, %%cr2 \n\t"
		"mov %c[rax](%3), %%rax \n\t"
		"mov %c[rbx](%3), %%rbx \n\t"
		"mov %c[rdx](%3), %%rdx \n\t"
		"mov %c[rsi](%3), %%rsi \n\t"
		"mov %c[rdi](%3), %%rdi \n\t"
		"mov %c[rbp](%3), %%rbp \n\t"
		"mov %c[r8](%3),  %%r8  \n\t"
		"mov %c[r9](%3),  %%r9  \n\t"
		"mov %c[r10](%3), %%r10 \n\t"
		"mov %c[r11](%3), %%r11 \n\t"
		"mov %c[r12](%3), %%r12 \n\t"
		"mov %c[r13](%3), %%r13 \n\t"
		"mov %c[r14](%3), %%r14 \n\t"
		"mov %c[r15](%3), %%r15 \n\t"
		"mov %c[rcx](%3), %%rcx \n\t" /* kills %3 (rcx) */
#else
		"mov %c[cr2](%3), %%eax \n\t"
		"mov %%eax,   %%cr2 \n\t"
		"mov %c[rax](%3), %%eax \n\t"
		"mov %c[rbx](%3), %%ebx \n\t"
		"mov %c[rdx](%3), %%edx \n\t"
		"mov %c[rsi](%3), %%esi \n\t"
		"mov %c[rdi](%3), %%edi \n\t"
		"mov %c[rbp](%3), %%ebp \n\t"
		"mov %c[rcx](%3), %%ecx \n\t" /* kills %3 (ecx) */
#endif
		/* Enter guest mode */
2193
		"jne .Llaunched \n\t"
A
Avi Kivity 已提交
2194
		ASM_VMX_VMLAUNCH "\n\t"
2195 2196 2197
		"jmp .Lkvm_vmx_return \n\t"
		".Llaunched: " ASM_VMX_VMRESUME "\n\t"
		".Lkvm_vmx_return: "
A
Avi Kivity 已提交
2198
		/* Save guest registers, load host registers, keep flags */
2199
#ifdef CONFIG_X86_64
2200
		"xchg %3,     (%%rsp) \n\t"
A
Avi Kivity 已提交
2201 2202
		"mov %%rax, %c[rax](%3) \n\t"
		"mov %%rbx, %c[rbx](%3) \n\t"
2203
		"pushq (%%rsp); popq %c[rcx](%3) \n\t"
A
Avi Kivity 已提交
2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217
		"mov %%rdx, %c[rdx](%3) \n\t"
		"mov %%rsi, %c[rsi](%3) \n\t"
		"mov %%rdi, %c[rdi](%3) \n\t"
		"mov %%rbp, %c[rbp](%3) \n\t"
		"mov %%r8,  %c[r8](%3) \n\t"
		"mov %%r9,  %c[r9](%3) \n\t"
		"mov %%r10, %c[r10](%3) \n\t"
		"mov %%r11, %c[r11](%3) \n\t"
		"mov %%r12, %c[r12](%3) \n\t"
		"mov %%r13, %c[r13](%3) \n\t"
		"mov %%r14, %c[r14](%3) \n\t"
		"mov %%r15, %c[r15](%3) \n\t"
		"mov %%cr2, %%rax   \n\t"
		"mov %%rax, %c[cr2](%3) \n\t"
2218
		"mov (%%rsp), %3 \n\t"
A
Avi Kivity 已提交
2219 2220 2221 2222 2223 2224

		"pop  %%rcx; pop  %%r15; pop  %%r14; pop  %%r13; pop  %%r12;"
		"pop  %%r11; pop  %%r10; pop  %%r9;  pop  %%r8;"
		"pop  %%rbp; pop  %%rdi; pop  %%rsi;"
		"pop  %%rdx; pop  %%rbx; pop  %%rax \n\t"
#else
2225
		"xchg %3, (%%esp) \n\t"
A
Avi Kivity 已提交
2226 2227
		"mov %%eax, %c[rax](%3) \n\t"
		"mov %%ebx, %c[rbx](%3) \n\t"
2228
		"pushl (%%esp); popl %c[rcx](%3) \n\t"
A
Avi Kivity 已提交
2229 2230 2231 2232 2233 2234
		"mov %%edx, %c[rdx](%3) \n\t"
		"mov %%esi, %c[rsi](%3) \n\t"
		"mov %%edi, %c[rdi](%3) \n\t"
		"mov %%ebp, %c[rbp](%3) \n\t"
		"mov %%cr2, %%eax  \n\t"
		"mov %%eax, %c[cr2](%3) \n\t"
2235
		"mov (%%esp), %3 \n\t"
A
Avi Kivity 已提交
2236 2237 2238 2239

		"pop %%ecx; popa \n\t"
#endif
		"setbe %0 \n\t"
2240
	      : "=q" (fail)
2241
	      : "r"(vmx->launched), "d"((unsigned long)HOST_RSP),
A
Avi Kivity 已提交
2242 2243 2244 2245 2246 2247 2248 2249
		"c"(vcpu),
		[rax]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RAX])),
		[rbx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBX])),
		[rcx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RCX])),
		[rdx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDX])),
		[rsi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RSI])),
		[rdi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDI])),
		[rbp]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBP])),
2250
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262
		[r8 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R8 ])),
		[r9 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R9 ])),
		[r10]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R10])),
		[r11]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R11])),
		[r12]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R12])),
		[r13]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R13])),
		[r14]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R14])),
		[r15]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R15])),
#endif
		[cr2]"i"(offsetof(struct kvm_vcpu, cr2))
	      : "cc", "memory" );

2263 2264 2265
	vcpu->guest_mode = 0;
	local_irq_enable();

A
Avi Kivity 已提交
2266
	++vcpu->stat.exits;
A
Avi Kivity 已提交
2267

2268
	vcpu->interrupt_window_open = (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;
A
Avi Kivity 已提交
2269 2270

	asm ("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
2271 2272 2273
	vmx->launched = 1;

	preempt_enable();
A
Avi Kivity 已提交
2274

A
Avi Kivity 已提交
2275
	if (unlikely(fail)) {
2276 2277 2278
		kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
		kvm_run->fail_entry.hardware_entry_failure_reason
			= vmcs_read32(VM_INSTRUCTION_ERROR);
2279
		r = 0;
A
Avi Kivity 已提交
2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306
		goto out;
	}
	/*
	 * Profile KVM exit RIPs:
	 */
	if (unlikely(prof_on == KVM_PROFILING))
		profile_hit(KVM_PROFILING, (void *)vmcs_readl(GUEST_RIP));

	r = kvm_handle_exit(kvm_run, vcpu);
	if (r > 0) {
		/* Give scheduler a change to reschedule. */
		if (signal_pending(current)) {
			r = -EINTR;
			kvm_run->exit_reason = KVM_EXIT_INTR;
			++vcpu->stat.signal_exits;
			goto out;
		}

		if (dm_request_for_irq_injection(vcpu, kvm_run)) {
			r = -EINTR;
			kvm_run->exit_reason = KVM_EXIT_INTR;
			++vcpu->stat.request_irq_exits;
			goto out;
		}
		if (!need_resched()) {
			++vcpu->stat.light_exits;
			goto again;
A
Avi Kivity 已提交
2307 2308
		}
	}
2309

2310 2311 2312 2313 2314 2315
out:
	if (r > 0) {
		kvm_resched(vcpu);
		goto preempted;
	}

2316
	post_kvm_run_save(vcpu, kvm_run);
2317
	return r;
A
Avi Kivity 已提交
2318 2319 2320 2321 2322 2323 2324 2325
}

static void vmx_inject_page_fault(struct kvm_vcpu *vcpu,
				  unsigned long addr,
				  u32 err_code)
{
	u32 vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);

A
Avi Kivity 已提交
2326
	++vcpu->stat.pf_guest;
A
Avi Kivity 已提交
2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351

	if (is_page_fault(vect_info)) {
		printk(KERN_DEBUG "inject_page_fault: "
		       "double fault 0x%lx @ 0x%lx\n",
		       addr, vmcs_readl(GUEST_RIP));
		vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, 0);
		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			     DF_VECTOR |
			     INTR_TYPE_EXCEPTION |
			     INTR_INFO_DELIEVER_CODE_MASK |
			     INTR_INFO_VALID_MASK);
		return;
	}
	vcpu->cr2 = addr;
	vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, err_code);
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
		     PF_VECTOR |
		     INTR_TYPE_EXCEPTION |
		     INTR_INFO_DELIEVER_CODE_MASK |
		     INTR_INFO_VALID_MASK);

}

static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
{
2352 2353 2354
	struct vcpu_vmx *vmx = to_vmx(vcpu);

	if (vmx->vmcs) {
A
Avi Kivity 已提交
2355
		on_each_cpu(__vcpu_clear, vcpu, 0, 1);
2356 2357
		free_vmcs(vmx->vmcs);
		vmx->vmcs = NULL;
A
Avi Kivity 已提交
2358 2359 2360 2361 2362
	}
}

static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
{
R
Rusty Russell 已提交
2363 2364
	struct vcpu_vmx *vmx = to_vmx(vcpu);

A
Avi Kivity 已提交
2365
	vmx_free_vmcs(vcpu);
R
Rusty Russell 已提交
2366 2367 2368 2369
	kfree(vmx->host_msrs);
	kfree(vmx->guest_msrs);
	kvm_vcpu_uninit(vcpu);
	kfree(vmx);
A
Avi Kivity 已提交
2370 2371
}

R
Rusty Russell 已提交
2372
static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
A
Avi Kivity 已提交
2373
{
R
Rusty Russell 已提交
2374 2375
	int err;
	struct vcpu_vmx *vmx = kzalloc(sizeof(*vmx), GFP_KERNEL);
2376
	int cpu;
A
Avi Kivity 已提交
2377

2378
	if (!vmx)
R
Rusty Russell 已提交
2379 2380 2381 2382 2383
		return ERR_PTR(-ENOMEM);

	err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
	if (err)
		goto free_vcpu;
2384

2385
	vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
R
Rusty Russell 已提交
2386 2387 2388 2389
	if (!vmx->guest_msrs) {
		err = -ENOMEM;
		goto uninit_vcpu;
	}
2390

2391 2392
	vmx->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!vmx->host_msrs)
R
Rusty Russell 已提交
2393
		goto free_guest_msrs;
2394

2395 2396
	vmx->vmcs = alloc_vmcs();
	if (!vmx->vmcs)
R
Rusty Russell 已提交
2397
		goto free_msrs;
2398 2399 2400

	vmcs_clear(vmx->vmcs);

2401 2402
	cpu = get_cpu();
	vmx_vcpu_load(&vmx->vcpu, cpu);
R
Rusty Russell 已提交
2403 2404
	err = vmx_vcpu_setup(&vmx->vcpu);
	vmx_vcpu_put(&vmx->vcpu);
2405
	put_cpu();
R
Rusty Russell 已提交
2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419
	if (err)
		goto free_vmcs;

	return &vmx->vcpu;

free_vmcs:
	free_vmcs(vmx->vmcs);
free_msrs:
	kfree(vmx->host_msrs);
free_guest_msrs:
	kfree(vmx->guest_msrs);
uninit_vcpu:
	kvm_vcpu_uninit(&vmx->vcpu);
free_vcpu:
2420
	kfree(vmx);
R
Rusty Russell 已提交
2421
	return ERR_PTR(err);
A
Avi Kivity 已提交
2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
}

static struct kvm_arch_ops vmx_arch_ops = {
	.cpu_has_kvm_support = cpu_has_kvm_support,
	.disabled_by_bios = vmx_disabled_by_bios,
	.hardware_setup = hardware_setup,
	.hardware_unsetup = hardware_unsetup,
	.hardware_enable = hardware_enable,
	.hardware_disable = hardware_disable,

	.vcpu_create = vmx_create_vcpu,
	.vcpu_free = vmx_free_vcpu,

	.vcpu_load = vmx_vcpu_load,
	.vcpu_put = vmx_vcpu_put,
A
Avi Kivity 已提交
2437
	.vcpu_decache = vmx_vcpu_decache,
A
Avi Kivity 已提交
2438 2439 2440 2441 2442 2443 2444 2445

	.set_guest_debug = set_guest_debug,
	.get_msr = vmx_get_msr,
	.set_msr = vmx_set_msr,
	.get_segment_base = vmx_get_segment_base,
	.get_segment = vmx_get_segment,
	.set_segment = vmx_set_segment,
	.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
2446
	.decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
A
Avi Kivity 已提交
2447 2448 2449
	.set_cr0 = vmx_set_cr0,
	.set_cr3 = vmx_set_cr3,
	.set_cr4 = vmx_set_cr4,
2450
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468
	.set_efer = vmx_set_efer,
#endif
	.get_idt = vmx_get_idt,
	.set_idt = vmx_set_idt,
	.get_gdt = vmx_get_gdt,
	.set_gdt = vmx_set_gdt,
	.cache_regs = vcpu_load_rsp_rip,
	.decache_regs = vcpu_put_rsp_rip,
	.get_rflags = vmx_get_rflags,
	.set_rflags = vmx_set_rflags,

	.tlb_flush = vmx_flush_tlb,
	.inject_page_fault = vmx_inject_page_fault,

	.inject_gp = vmx_inject_gp,

	.run = vmx_vcpu_run,
	.skip_emulated_instruction = skip_emulated_instruction,
I
Ingo Molnar 已提交
2469
	.patch_hypercall = vmx_patch_hypercall,
A
Avi Kivity 已提交
2470 2471 2472 2473
};

static int __init vmx_init(void)
{
2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493
	void *iova;
	int r;

	vmx_io_bitmap_a = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
	if (!vmx_io_bitmap_a)
		return -ENOMEM;

	vmx_io_bitmap_b = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
	if (!vmx_io_bitmap_b) {
		r = -ENOMEM;
		goto out;
	}

	/*
	 * Allow direct access to the PC debug port (it is often used for I/O
	 * delays, but the vmexits simply slow things down).
	 */
	iova = kmap(vmx_io_bitmap_a);
	memset(iova, 0xff, PAGE_SIZE);
	clear_bit(0x80, iova);
2494
	kunmap(vmx_io_bitmap_a);
2495 2496 2497

	iova = kmap(vmx_io_bitmap_b);
	memset(iova, 0xff, PAGE_SIZE);
2498
	kunmap(vmx_io_bitmap_b);
2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510

	r = kvm_init_arch(&vmx_arch_ops, THIS_MODULE);
	if (r)
		goto out1;

	return 0;

out1:
	__free_page(vmx_io_bitmap_b);
out:
	__free_page(vmx_io_bitmap_a);
	return r;
A
Avi Kivity 已提交
2511 2512 2513 2514
}

static void __exit vmx_exit(void)
{
2515 2516 2517
	__free_page(vmx_io_bitmap_b);
	__free_page(vmx_io_bitmap_a);

A
Avi Kivity 已提交
2518 2519 2520 2521 2522
	kvm_exit_arch();
}

module_init(vmx_init)
module_exit(vmx_exit)