vmx.c 57.9 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
static int init_rmode_tss(struct kvm *kvm);

A
Avi Kivity 已提交
37 38 39
static DEFINE_PER_CPU(struct vmcs *, vmxarea);
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);

40 41 42
static struct page *vmx_io_bitmap_a;
static struct page *vmx_io_bitmap_b;

43
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
44 45 46 47
#define HOST_IS_64 1
#else
#define HOST_IS_64 0
#endif
48
#define EFER_SAVE_RESTORE_BITS ((u64)EFER_SCE)
A
Avi Kivity 已提交
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

static struct vmcs_descriptor {
	int size;
	int order;
	u32 revision_id;
} vmcs_descriptor;

#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),
};

80 81 82 83
/*
 * 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
84
static const u32 vmx_msr_index[] = {
85
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
86 87 88 89
	MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
#endif
	MSR_EFER, MSR_K6_STAR,
};
90
#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
A
Avi Kivity 已提交
91

92 93 94 95 96 97 98 99 100 101 102 103
static inline u64 msr_efer_save_restore_bits(struct vmx_msr_entry msr)
{
	return (u64)msr.data & EFER_SAVE_RESTORE_BITS;
}

static inline int msr_efer_need_save_restore(struct kvm_vcpu *vcpu)
{
	int efer_offset = vcpu->msr_offset_efer;
	return msr_efer_save_restore_bits(vcpu->host_msrs[efer_offset]) !=
		msr_efer_save_restore_bits(vcpu->guest_msrs[efer_offset]);
}

A
Avi Kivity 已提交
104 105 106 107 108 109 110
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);
}

111 112 113 114 115 116 117
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
118 119 120 121 122 123
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);
}

124
static int __find_msr_index(struct kvm_vcpu *vcpu, u32 msr)
125 126 127 128 129
{
	int i;

	for (i = 0; i < vcpu->nmsrs; ++i)
		if (vcpu->guest_msrs[i].index == msr)
130 131 132 133 134 135 136 137 138 139 140
			return i;
	return -1;
}

static struct vmx_msr_entry *find_msr_entry(struct kvm_vcpu *vcpu, u32 msr)
{
	int i;

	i = __find_msr_index(vcpu, msr);
	if (i >= 0)
		return &vcpu->guest_msrs[i];
A
Al Viro 已提交
141
	return NULL;
142 143
}

A
Avi Kivity 已提交
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
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;
160
	int cpu = raw_smp_processor_id();
A
Avi Kivity 已提交
161 162 163 164 165

	if (vcpu->cpu == cpu)
		vmcs_clear(vcpu->vmcs);
	if (per_cpu(current_vmcs, cpu) == vcpu->vmcs)
		per_cpu(current_vmcs, cpu) = NULL;
166
	rdtscll(vcpu->host_tsc);
A
Avi Kivity 已提交
167 168
}

A
Avi Kivity 已提交
169 170 171 172 173 174 175 176 177
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);
	vcpu->launched = 0;
}

A
Avi Kivity 已提交
178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198
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)
{
199
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
200 201 202 203 204 205
	return vmcs_readl(field);
#else
	return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
#endif
}

206 207 208 209 210 211 212
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
213 214 215 216 217 218
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" );
219 220
	if (unlikely(error))
		vmwrite_error(field, value);
A
Avi Kivity 已提交
221 222 223 224 225 226 227 228 229 230 231 232 233 234
}

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)
{
235
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
236 237 238 239 240 241 242 243
	vmcs_writel(field, value);
#else
	vmcs_writel(field, value);
	asm volatile ("");
	vmcs_writel(field+1, value >> 32);
#endif
}

244 245 246 247 248 249 250 251 252 253
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);
}

254 255 256 257 258 259 260 261 262 263 264 265 266 267
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);
}

268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
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
}

285 286 287 288 289 290 291 292 293 294 295 296 297
static void load_transition_efer(struct kvm_vcpu *vcpu)
{
	u64 trans_efer;
	int efer_offset = vcpu->msr_offset_efer;

	trans_efer = vcpu->host_msrs[efer_offset].data;
	trans_efer &= ~EFER_SAVE_RESTORE_BITS;
	trans_efer |= msr_efer_save_restore_bits(
				vcpu->guest_msrs[efer_offset]);
	wrmsrl(MSR_EFER, trans_efer);
	vcpu->stat.efer_reload++;
}

298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333
static void vmx_save_host_state(struct kvm_vcpu *vcpu)
{
	struct vmx_host_state *hs = &vcpu->vmx_host_state;

	if (hs->loaded)
		return;

	hs->loaded = 1;
	/*
	 * Set host fs and gs selectors.  Unfortunately, 22.2.3 does not
	 * allow segment selectors with cpl > 0 or ti == 1.
	 */
	hs->ldt_sel = read_ldt();
	hs->fs_gs_ldt_reload_needed = hs->ldt_sel;
	hs->fs_sel = read_fs();
	if (!(hs->fs_sel & 7))
		vmcs_write16(HOST_FS_SELECTOR, hs->fs_sel);
	else {
		vmcs_write16(HOST_FS_SELECTOR, 0);
		hs->fs_gs_ldt_reload_needed = 1;
	}
	hs->gs_sel = read_gs();
	if (!(hs->gs_sel & 7))
		vmcs_write16(HOST_GS_SELECTOR, hs->gs_sel);
	else {
		vmcs_write16(HOST_GS_SELECTOR, 0);
		hs->fs_gs_ldt_reload_needed = 1;
	}

#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
	vmcs_writel(HOST_FS_BASE, segment_base(hs->fs_sel));
	vmcs_writel(HOST_GS_BASE, segment_base(hs->gs_sel));
#endif
334 335 336

#ifdef CONFIG_X86_64
	if (is_long_mode(vcpu)) {
337
		save_msrs(vcpu->host_msrs + vcpu->msr_offset_kernel_gs_base, 1);
338 339
	}
#endif
340
	load_msrs(vcpu->guest_msrs, vcpu->save_nmsrs);
341 342
	if (msr_efer_need_save_restore(vcpu))
		load_transition_efer(vcpu);
343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368
}

static void vmx_load_host_state(struct kvm_vcpu *vcpu)
{
	struct vmx_host_state *hs = &vcpu->vmx_host_state;

	if (!hs->loaded)
		return;

	hs->loaded = 0;
	if (hs->fs_gs_ldt_reload_needed) {
		load_ldt(hs->ldt_sel);
		load_fs(hs->fs_sel);
		/*
		 * If we have to reload gs, we must take care to
		 * preserve our gs base.
		 */
		local_irq_disable();
		load_gs(hs->gs_sel);
#ifdef CONFIG_X86_64
		wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
#endif
		local_irq_enable();

		reload_tss();
	}
369 370
	save_msrs(vcpu->guest_msrs, vcpu->save_nmsrs);
	load_msrs(vcpu->host_msrs, vcpu->save_nmsrs);
371 372
	if (msr_efer_need_save_restore(vcpu))
		load_msrs(vcpu->host_msrs + vcpu->msr_offset_efer, 1);
373 374
}

A
Avi Kivity 已提交
375 376 377 378
/*
 * Switches to specified vcpu, until a matching vcpu_put(), but assumes
 * vcpu mutex is already taken.
 */
A
Avi Kivity 已提交
379
static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
380 381 382
{
	u64 phys_addr = __pa(vcpu->vmcs);
	int cpu;
383
	u64 tsc_this, delta;
A
Avi Kivity 已提交
384 385 386

	cpu = get_cpu();

A
Avi Kivity 已提交
387 388
	if (vcpu->cpu != cpu)
		vcpu_clear(vcpu);
A
Avi Kivity 已提交
389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416

	if (per_cpu(current_vmcs, cpu) != vcpu->vmcs) {
		u8 error;

		per_cpu(current_vmcs, cpu) = vcpu->vmcs;
		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",
			       vcpu->vmcs, phys_addr);
	}

	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 */
417 418 419 420 421 422 423

		/*
		 * 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
424 425 426 427 428
	}
}

static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
{
429
	vmx_load_host_state(vcpu);
430
	kvm_put_guest_fpu(vcpu);
A
Avi Kivity 已提交
431 432 433
	put_cpu();
}

434 435 436 437 438
static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
{
	if (vcpu->fpu_active)
		return;
	vcpu->fpu_active = 1;
439 440 441
	vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
	if (vcpu->cr0 & X86_CR0_TS)
		vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
442 443 444 445 446 447 448 449
	update_exception_bitmap(vcpu);
}

static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
{
	if (!vcpu->fpu_active)
		return;
	vcpu->fpu_active = 0;
450
	vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
451 452 453
	update_exception_bitmap(vcpu);
}

A
Avi Kivity 已提交
454 455 456 457 458
static void vmx_vcpu_decache(struct kvm_vcpu *vcpu)
{
	vcpu_clear(vcpu);
}

A
Avi Kivity 已提交
459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485
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);
486
	vcpu->interrupt_window_open = 1;
A
Avi Kivity 已提交
487 488 489 490 491 492 493 494 495 496 497 498 499 500
}

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);
}

501 502 503 504 505 506 507 508 509 510 511 512 513 514
/*
 * Swap MSR entry in host/guest MSR entry array.
 */
void move_msr_up(struct kvm_vcpu *vcpu, int from, int to)
{
	struct vmx_msr_entry tmp;
	tmp = vcpu->guest_msrs[to];
	vcpu->guest_msrs[to] = vcpu->guest_msrs[from];
	vcpu->guest_msrs[from] = tmp;
	tmp = vcpu->host_msrs[to];
	vcpu->host_msrs[to] = vcpu->host_msrs[from];
	vcpu->host_msrs[from] = tmp;
}

515 516 517 518 519 520 521
/*
 * 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)
{
522
	int save_nmsrs;
523

524 525 526
	save_nmsrs = 0;
#ifdef CONFIG_X86_64
	if (is_long_mode(vcpu)) {
527 528
		int index;

529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550
		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
	vcpu->save_nmsrs = save_nmsrs;
551

552
#ifdef CONFIG_X86_64
553 554
	vcpu->msr_offset_kernel_gs_base =
		__find_msr_index(vcpu, MSR_KERNEL_GS_BASE);
555
#endif
556
	vcpu->msr_offset_efer = __find_msr_index(vcpu, MSR_EFER);
557 558
}

A
Avi Kivity 已提交
559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599
/*
 * 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;
	struct vmx_msr_entry *msr;

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

	switch (msr_index) {
600
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
601 602 603 604 605 606 607
	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:
608
		return kvm_get_msr_common(vcpu, msr_index, pdata);
A
Avi Kivity 已提交
609 610 611 612 613 614 615 616
#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
617
		data = vmcs_readl(GUEST_SYSENTER_EIP);
A
Avi Kivity 已提交
618 619
		break;
	case MSR_IA32_SYSENTER_ESP:
A
Avi Kivity 已提交
620
		data = vmcs_readl(GUEST_SYSENTER_ESP);
A
Avi Kivity 已提交
621 622 623
		break;
	default:
		msr = find_msr_entry(vcpu, msr_index);
624 625 626
		if (msr) {
			data = msr->data;
			break;
A
Avi Kivity 已提交
627
		}
628
		return kvm_get_msr_common(vcpu, msr_index, pdata);
A
Avi Kivity 已提交
629 630 631 632 633 634 635 636 637 638 639 640 641 642
	}

	*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)
{
	struct vmx_msr_entry *msr;
643 644
	int ret = 0;

A
Avi Kivity 已提交
645
	switch (msr_index) {
646
#ifdef CONFIG_X86_64
647
	case MSR_EFER:
648 649 650 651
		ret = kvm_set_msr_common(vcpu, msr_index, data);
		if (vcpu->vmx_host_state.loaded)
			load_transition_efer(vcpu);
		break;
A
Avi Kivity 已提交
652 653 654 655 656 657 658 659 660 661 662
	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
663
		vmcs_writel(GUEST_SYSENTER_EIP, data);
A
Avi Kivity 已提交
664 665
		break;
	case MSR_IA32_SYSENTER_ESP:
A
Avi Kivity 已提交
666
		vmcs_writel(GUEST_SYSENTER_ESP, data);
A
Avi Kivity 已提交
667
		break;
A
Avi Kivity 已提交
668
	case MSR_IA32_TIME_STAMP_COUNTER:
A
Avi Kivity 已提交
669 670 671 672
		guest_write_tsc(data);
		break;
	default:
		msr = find_msr_entry(vcpu, msr_index);
673 674
		if (msr) {
			msr->data = data;
675
			if (vcpu->vmx_host_state.loaded)
676
				load_msrs(vcpu->guest_msrs, vcpu->save_nmsrs);
677
			break;
A
Avi Kivity 已提交
678
		}
679
		ret = kvm_set_msr_common(vcpu, msr_index, data);
A
Avi Kivity 已提交
680 681
	}

682
	return ret;
A
Avi Kivity 已提交
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
}

/*
 * 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;
726
	} else
A
Avi Kivity 已提交
727 728 729 730 731 732 733 734 735 736
		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);
	}

737
	update_exception_bitmap(vcpu);
A
Avi Kivity 已提交
738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756
	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);
	return (msr & 5) == 1; /* locked but not enabled */
}

A
Avi Kivity 已提交
757
static void hardware_enable(void *garbage)
A
Avi Kivity 已提交
758 759 760 761 762 763
{
	int cpu = raw_smp_processor_id();
	u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
	u64 old;

	rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
764
	if ((old & 5) != 5)
A
Avi Kivity 已提交
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
		/* enable and lock */
		wrmsrl(MSR_IA32_FEATURE_CONTROL, old | 5);
	write_cr4(read_cr4() | CR4_VMXE); /* FIXME: not cpu hotplug safe */
	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");
}

static __init void setup_vmcs_descriptor(void)
{
	u32 vmx_msr_low, vmx_msr_high;

N
Nguyen Anh Quynh 已提交
781
	rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
A
Avi Kivity 已提交
782 783 784
	vmcs_descriptor.size = vmx_msr_high & 0x1fff;
	vmcs_descriptor.order = get_order(vmcs_descriptor.size);
	vmcs_descriptor.revision_id = vmx_msr_low;
N
Nguyen Anh Quynh 已提交
785
}
A
Avi Kivity 已提交
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803

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

	pages = alloc_pages_node(node, GFP_KERNEL, vmcs_descriptor.order);
	if (!pages)
		return NULL;
	vmcs = page_address(pages);
	memset(vmcs, 0, vmcs_descriptor.size);
	vmcs->revision_id = vmcs_descriptor.revision_id; /* vmcs revision id */
	return vmcs;
}

static struct vmcs *alloc_vmcs(void)
{
804
	return alloc_vmcs_cpu(raw_smp_processor_id());
A
Avi Kivity 已提交
805 806 807 808 809 810 811
}

static void free_vmcs(struct vmcs *vmcs)
{
	free_pages((unsigned long)vmcs, vmcs_descriptor.order);
}

812
static void free_kvm_area(void)
A
Avi Kivity 已提交
813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854
{
	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)
{
	setup_vmcs_descriptor();
	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];

855
	if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
A
Avi Kivity 已提交
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
		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);

	vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~CR4_VME_MASK) |
			(vmcs_readl(CR4_READ_SHADOW) & CR4_VME_MASK));

	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);
	vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | CR4_VME_MASK);
	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);
948
	vmcs_write32(GUEST_CS_LIMIT, 0xffff);
949 950
	if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
		vmcs_writel(GUEST_CS_BASE, 0xf0000);
A
Avi Kivity 已提交
951 952 953 954 955 956
	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);
957 958

	init_rmode_tss(vcpu->kvm);
A
Avi Kivity 已提交
959 960
}

961
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994

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

995
static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
996 997 998 999 1000
{
	vcpu->cr4 &= KVM_GUEST_CR4_MASK;
	vcpu->cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
}

A
Avi Kivity 已提交
1001 1002
static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
1003 1004
	vmx_fpu_deactivate(vcpu);

1005
	if (vcpu->rmode.active && (cr0 & X86_CR0_PE))
A
Avi Kivity 已提交
1006 1007
		enter_pmode(vcpu);

1008
	if (!vcpu->rmode.active && !(cr0 & X86_CR0_PE))
A
Avi Kivity 已提交
1009 1010
		enter_rmode(vcpu);

1011
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1012
	if (vcpu->shadow_efer & EFER_LME) {
1013
		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
A
Avi Kivity 已提交
1014
			enter_lmode(vcpu);
1015
		if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
A
Avi Kivity 已提交
1016 1017 1018 1019 1020 1021 1022 1023
			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;
1024

1025
	if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
1026
		vmx_fpu_activate(vcpu);
A
Avi Kivity 已提交
1027 1028 1029 1030 1031
}

static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
	vmcs_writel(GUEST_CR3, cr3);
1032
	if (vcpu->cr0 & X86_CR0_PE)
1033
		vmx_fpu_deactivate(vcpu);
A
Avi Kivity 已提交
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
}

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;
}

1044
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063

static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
	struct vmx_msr_entry *msr = find_msr_entry(vcpu, MSR_EFER);

	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;
	}
1064
	setup_msrs(vcpu);
A
Avi Kivity 已提交
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
}

#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;
}

1099
static u32 vmx_segment_access_rights(struct kvm_segment *var)
A
Avi Kivity 已提交
1100 1101 1102
{
	u32 ar;

1103
	if (var->unusable)
A
Avi Kivity 已提交
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
		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;
	}
1115 1116
	if (ar == 0) /* a 0 value means unusable */
		ar = AR_UNUSABLE_MASK;
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145

	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
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
	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
1187 1188 1189
	p1 = gfn_to_page(kvm, fn++);
	p2 = gfn_to_page(kvm, fn++);
	p3 = gfn_to_page(kvm, fn);
A
Avi Kivity 已提交
1190 1191 1192 1193 1194 1195 1196

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

	page = kmap_atomic(p1, KM_USER0);
1197
	clear_page(page);
A
Avi Kivity 已提交
1198 1199 1200 1201
	*(u16*)(page + 0x66) = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
	kunmap_atomic(page, KM_USER0);

	page = kmap_atomic(p2, KM_USER0);
1202
	clear_page(page);
A
Avi Kivity 已提交
1203 1204 1205
	kunmap_atomic(page, KM_USER0);

	page = kmap_atomic(p3, KM_USER0);
1206
	clear_page(page);
A
Avi Kivity 已提交
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 1240 1241 1242 1243 1244
	*(page + RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1) = ~0;
	kunmap_atomic(page, KM_USER0);

	return 1;
}

static void vmcs_write32_fixedbits(u32 msr, u32 vmcs_field, u32 val)
{
	u32 msr_high, msr_low;

	rdmsr(msr, msr_low, msr_high);

	val &= msr_high;
	val |= msr_low;
	vmcs_write32(vmcs_field, val);
}

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)
{
	u32 host_sysenter_cs;
	u32 junk;
	unsigned long a;
	struct descriptor_table dt;
	int i;
	int ret = 0;
1245
	unsigned long kvm_vmx_return;
A
Avi Kivity 已提交
1246 1247 1248 1249 1250 1251 1252 1253 1254

	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;
1255
	vcpu->apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
1256
	if (vcpu->vcpu_id == 0)
1257
		vcpu->apic_base |= MSR_IA32_APICBASE_BSP;
A
Avi Kivity 已提交
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 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307

	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 */
1308 1309
	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
1310 1311 1312 1313 1314 1315 1316 1317 1318

	guest_write_tsc(0);

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

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

	/* Control */
N
Nguyen Anh Quynh 已提交
1319
	vmcs_write32_fixedbits(MSR_IA32_VMX_PINBASED_CTLS,
A
Avi Kivity 已提交
1320 1321 1322 1323
			       PIN_BASED_VM_EXEC_CONTROL,
			       PIN_BASED_EXT_INTR_MASK   /* 20.6.1 */
			       | PIN_BASED_NMI_EXITING   /* 20.6.1 */
			);
N
Nguyen Anh Quynh 已提交
1324
	vmcs_write32_fixedbits(MSR_IA32_VMX_PROCBASED_CTLS,
A
Avi Kivity 已提交
1325 1326 1327 1328
			       CPU_BASED_VM_EXEC_CONTROL,
			       CPU_BASED_HLT_EXITING         /* 20.6.2 */
			       | CPU_BASED_CR8_LOAD_EXITING    /* 20.6.2 */
			       | CPU_BASED_CR8_STORE_EXITING   /* 20.6.2 */
1329
			       | CPU_BASED_ACTIVATE_IO_BITMAP  /* 20.6.2 */
A
Avi Kivity 已提交
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347
			       | CPU_BASED_MOV_DR_EXITING
			       | CPU_BASED_USE_TSC_OFFSETING   /* 21.3 */
			);

	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 */
1348
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362
	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 */

1363 1364
	asm ("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
	vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
1365 1366 1367
	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
1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383

	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;
		int j = vcpu->nmsrs;

		if (rdmsr_safe(index, &data_low, &data_high) < 0)
			continue;
1384 1385
		if (wrmsr_safe(index, data_low, data_high) < 0)
			continue;
A
Avi Kivity 已提交
1386 1387 1388 1389 1390 1391 1392 1393
		data = data_low | ((u64)data_high << 32);
		vcpu->host_msrs[j].index = index;
		vcpu->host_msrs[j].reserved = 0;
		vcpu->host_msrs[j].data = data;
		vcpu->guest_msrs[j] = vcpu->host_msrs[j];
		++vcpu->nmsrs;
	}

1394 1395
	setup_msrs(vcpu);

N
Nguyen Anh Quynh 已提交
1396
	vmcs_write32_fixedbits(MSR_IA32_VMX_EXIT_CTLS, VM_EXIT_CONTROLS,
A
Avi Kivity 已提交
1397 1398 1399
		     	       (HOST_IS_64 << 9));  /* 22.2,1, 20.7.1 */

	/* 22.2.1, 20.8.1 */
N
Nguyen Anh Quynh 已提交
1400
	vmcs_write32_fixedbits(MSR_IA32_VMX_ENTRY_CTLS,
A
Avi Kivity 已提交
1401 1402 1403
                               VM_ENTRY_CONTROLS, 0);
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */

1404
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1405 1406
	vmcs_writel(VIRTUAL_APIC_PAGE_ADDR, 0);
	vmcs_writel(TPR_THRESHOLD, 0);
1407
#endif
A
Avi Kivity 已提交
1408

1409
	vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
A
Avi Kivity 已提交
1410 1411 1412 1413 1414
	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);
1415
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
1416 1417
	vmx_set_efer(vcpu, 0);
#endif
1418
	vmx_fpu_activate(vcpu);
1419
	update_exception_bitmap(vcpu);
A
Avi Kivity 已提交
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436

	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);

1437
	if (sp > ss_limit || sp < 6 ) {
A
Avi Kivity 已提交
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
		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);
}

1490 1491 1492

static void do_interrupt_requests(struct kvm_vcpu *vcpu,
				       struct kvm_run *kvm_run)
A
Avi Kivity 已提交
1493
{
1494 1495 1496 1497 1498 1499 1500 1501 1502
	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
1503
		/*
1504
		 * If interrupts enabled, and not blocked by sti or mov ss. Good.
A
Avi Kivity 已提交
1505 1506
		 */
		kvm_do_inject_irq(vcpu);
1507 1508 1509 1510

	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
1511 1512 1513
		/*
		 * Interrupts blocked.  Wait for unblock.
		 */
1514 1515 1516 1517
		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
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
}

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;

1544 1545 1546 1547 1548
	/*
	 * 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
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
		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;
1560
	int r;
A
Avi Kivity 已提交
1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580

	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;
	}
1581 1582

	if (is_no_device(intr_info)) {
1583
		vmx_fpu_activate(vcpu);
1584 1585 1586
		return 1;
	}

A
Avi Kivity 已提交
1587 1588 1589 1590 1591 1592 1593 1594
	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);

		spin_lock(&vcpu->kvm->lock);
1595 1596 1597 1598 1599 1600
		r = kvm_mmu_page_fault(vcpu, cr2, error_code);
		if (r < 0) {
			spin_unlock(&vcpu->kvm->lock);
			return r;
		}
		if (!r) {
A
Avi Kivity 已提交
1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611
			spin_unlock(&vcpu->kvm->lock);
			return 1;
		}

		er = emulate_instruction(vcpu, kvm_run, cr2, error_code);
		spin_unlock(&vcpu->kvm->lock);

		switch (er) {
		case EMULATE_DONE:
			return 1;
		case EMULATE_DO_MMIO:
A
Avi Kivity 已提交
1612
			++vcpu->stat.mmio_exits;
A
Avi Kivity 已提交
1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624
			kvm_run->exit_reason = KVM_EXIT_MMIO;
			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,
1625 1626 1627 1628 1629
								error_code)) {
		if (vcpu->halt_request) {
			vcpu->halt_request = 0;
			return kvm_emulate_halt(vcpu);
		}
A
Avi Kivity 已提交
1630
		return 1;
1631
	}
A
Avi Kivity 已提交
1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645

	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
1646
	++vcpu->stat.irq_exits;
A
Avi Kivity 已提交
1647 1648 1649
	return 1;
}

1650 1651 1652 1653 1654
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
1655

1656
static int get_io_count(struct kvm_vcpu *vcpu, unsigned long *count)
A
Avi Kivity 已提交
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700
{
	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));
1701
	//printk("cx: %lx\n", vcpu->regs[VCPU_REGS_RCX]);
A
Avi Kivity 已提交
1702 1703 1704 1705 1706 1707
	return 1;
}

static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u64 exit_qualification;
1708 1709 1710 1711
	int size, down, in, string, rep;
	unsigned port;
	unsigned long count;
	gva_t address;
A
Avi Kivity 已提交
1712

A
Avi Kivity 已提交
1713
	++vcpu->stat.io_exits;
A
Avi Kivity 已提交
1714
	exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724
	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
1725
			return 1;
1726 1727 1728 1729
		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
1730 1731
}

I
Ingo Molnar 已提交
1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743
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
1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
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;
1778 1779
	case 2: /* clts */
		vcpu_load_rsp_rip(vcpu);
1780
		vmx_fpu_deactivate(vcpu);
1781
		vcpu->cr0 &= ~X86_CR0_TS;
1782
		vmcs_writel(CR0_READ_SHADOW, vcpu->cr0);
1783
		vmx_fpu_activate(vcpu);
1784 1785
		skip_emulated_instruction(vcpu);
		return 1;
A
Avi Kivity 已提交
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 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852
	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)
{
1853 1854
	kvm_emulate_cpuid(vcpu);
	return 1;
A
Avi Kivity 已提交
1855 1856 1857 1858 1859 1860 1861 1862 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
}

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;
}

1889 1890 1891 1892 1893 1894 1895 1896 1897 1898
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
1899 1900 1901
static int handle_interrupt_window(struct kvm_vcpu *vcpu,
				   struct kvm_run *kvm_run)
{
1902 1903 1904 1905 1906
	/*
	 * If the user space waits to inject interrupts, exit as soon as
	 * possible
	 */
	if (kvm_run->request_interrupt_window &&
1907
	    !vcpu->irq_summary) {
1908
		kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
A
Avi Kivity 已提交
1909
		++vcpu->stat.irq_window_exits;
1910 1911
		return 0;
	}
A
Avi Kivity 已提交
1912 1913 1914 1915 1916 1917
	return 1;
}

static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	skip_emulated_instruction(vcpu);
1918
	return kvm_emulate_halt(vcpu);
A
Avi Kivity 已提交
1919 1920
}

1921 1922
static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
1923
	skip_emulated_instruction(vcpu);
1924
	return kvm_hypercall(vcpu, kvm_run);
1925 1926
}

A
Avi Kivity 已提交
1927 1928 1929 1930 1931 1932 1933 1934 1935
/*
 * 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,
1936
	[EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
A
Avi Kivity 已提交
1937 1938 1939 1940 1941 1942 1943 1944
	[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,
1945
	[EXIT_REASON_VMCALL]                  = handle_vmcall,
A
Avi Kivity 已提交
1946 1947 1948
};

static const int kvm_vmx_max_exit_handlers =
1949
	ARRAY_SIZE(kvm_vmx_exit_handlers);
A
Avi Kivity 已提交
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973

/*
 * 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;
}

1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
/*
 * 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));
}

1989 1990 1991 1992
static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
{
}

A
Avi Kivity 已提交
1993 1994 1995
static int vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u8 fail;
1996
	int r;
A
Avi Kivity 已提交
1997

1998
preempted:
A
Avi Kivity 已提交
1999 2000 2001
	if (vcpu->guest_debug.enabled)
		kvm_guest_debug_pre(vcpu);

2002
again:
2003 2004 2005
	if (!vcpu->mmio_read_completed)
		do_interrupt_requests(vcpu, kvm_run);

2006
	vmx_save_host_state(vcpu);
2007 2008
	kvm_load_guest_fpu(vcpu);

A
Avi Kivity 已提交
2009 2010 2011 2012
	r = kvm_mmu_reload(vcpu);
	if (unlikely(r))
		goto out;

2013 2014 2015 2016 2017
	/*
	 * Loading guest fpu may have cleared host cr0.ts
	 */
	vmcs_writel(HOST_CR0, read_cr0());

2018 2019 2020 2021 2022 2023 2024
	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
2025 2026
	asm (
		/* Store host registers */
2027
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040
		"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. */
2041
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
		"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 */
2071
		"jne .Llaunched \n\t"
A
Avi Kivity 已提交
2072
		ASM_VMX_VMLAUNCH "\n\t"
2073 2074 2075
		"jmp .Lkvm_vmx_return \n\t"
		".Llaunched: " ASM_VMX_VMRESUME "\n\t"
		".Lkvm_vmx_return: "
A
Avi Kivity 已提交
2076
		/* Save guest registers, load host registers, keep flags */
2077
#ifdef CONFIG_X86_64
2078
		"xchg %3,     (%%rsp) \n\t"
A
Avi Kivity 已提交
2079 2080
		"mov %%rax, %c[rax](%3) \n\t"
		"mov %%rbx, %c[rbx](%3) \n\t"
2081
		"pushq (%%rsp); popq %c[rcx](%3) \n\t"
A
Avi Kivity 已提交
2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095
		"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"
2096
		"mov (%%rsp), %3 \n\t"
A
Avi Kivity 已提交
2097 2098 2099 2100 2101 2102

		"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
2103
		"xchg %3, (%%esp) \n\t"
A
Avi Kivity 已提交
2104 2105
		"mov %%eax, %c[rax](%3) \n\t"
		"mov %%ebx, %c[rbx](%3) \n\t"
2106
		"pushl (%%esp); popl %c[rcx](%3) \n\t"
A
Avi Kivity 已提交
2107 2108 2109 2110 2111 2112
		"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"
2113
		"mov (%%esp), %3 \n\t"
A
Avi Kivity 已提交
2114 2115 2116 2117

		"pop %%ecx; popa \n\t"
#endif
		"setbe %0 \n\t"
2118
	      : "=q" (fail)
A
Avi Kivity 已提交
2119 2120 2121 2122 2123 2124 2125 2126 2127
	      : "r"(vcpu->launched), "d"((unsigned long)HOST_RSP),
		"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])),
2128
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140
		[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" );

2141 2142 2143
	vcpu->guest_mode = 0;
	local_irq_enable();

A
Avi Kivity 已提交
2144
	++vcpu->stat.exits;
A
Avi Kivity 已提交
2145

2146
	vcpu->interrupt_window_open = (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;
A
Avi Kivity 已提交
2147 2148 2149

	asm ("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));

A
Avi Kivity 已提交
2150
	if (unlikely(fail)) {
2151 2152 2153
		kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
		kvm_run->fail_entry.hardware_entry_failure_reason
			= vmcs_read32(VM_INSTRUCTION_ERROR);
2154
		r = 0;
A
Avi Kivity 已提交
2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
		goto out;
	}
	/*
	 * Profile KVM exit RIPs:
	 */
	if (unlikely(prof_on == KVM_PROFILING))
		profile_hit(KVM_PROFILING, (void *)vmcs_readl(GUEST_RIP));

	vcpu->launched = 1;
	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
2183 2184
		}
	}
2185

2186 2187 2188 2189 2190 2191
out:
	if (r > 0) {
		kvm_resched(vcpu);
		goto preempted;
	}

2192
	post_kvm_run_save(vcpu, kvm_run);
2193
	return r;
A
Avi Kivity 已提交
2194 2195 2196 2197 2198 2199 2200 2201
}

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
2202
	++vcpu->stat.pf_guest;
A
Avi Kivity 已提交
2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243

	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)
{
	if (vcpu->vmcs) {
		on_each_cpu(__vcpu_clear, vcpu, 0, 1);
		free_vmcs(vcpu->vmcs);
		vcpu->vmcs = NULL;
	}
}

static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
{
	vmx_free_vmcs(vcpu);
}

static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
{
	struct vmcs *vmcs;

2244 2245 2246 2247 2248 2249 2250 2251
	vcpu->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!vcpu->guest_msrs)
		return -ENOMEM;

	vcpu->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!vcpu->host_msrs)
		goto out_free_guest_msrs;

A
Avi Kivity 已提交
2252 2253
	vmcs = alloc_vmcs();
	if (!vmcs)
2254 2255
		goto out_free_msrs;

A
Avi Kivity 已提交
2256 2257 2258
	vmcs_clear(vmcs);
	vcpu->vmcs = vmcs;
	vcpu->launched = 0;
2259

A
Avi Kivity 已提交
2260
	return 0;
2261 2262 2263 2264 2265 2266 2267 2268 2269 2270

out_free_msrs:
	kfree(vcpu->host_msrs);
	vcpu->host_msrs = NULL;

out_free_guest_msrs:
	kfree(vcpu->guest_msrs);
	vcpu->guest_msrs = NULL;

	return -ENOMEM;
A
Avi Kivity 已提交
2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285
}

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
2286
	.vcpu_decache = vmx_vcpu_decache,
A
Avi Kivity 已提交
2287 2288 2289 2290 2291 2292 2293 2294

	.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,
2295
	.decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
A
Avi Kivity 已提交
2296 2297 2298
	.set_cr0 = vmx_set_cr0,
	.set_cr3 = vmx_set_cr3,
	.set_cr4 = vmx_set_cr4,
2299
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318
	.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,
	.vcpu_setup = vmx_vcpu_setup,
I
Ingo Molnar 已提交
2319
	.patch_hypercall = vmx_patch_hypercall,
A
Avi Kivity 已提交
2320 2321 2322 2323
};

static int __init vmx_init(void)
{
2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343
	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);
2344
	kunmap(vmx_io_bitmap_a);
2345 2346 2347

	iova = kmap(vmx_io_bitmap_b);
	memset(iova, 0xff, PAGE_SIZE);
2348
	kunmap(vmx_io_bitmap_b);
2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360

	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
2361 2362 2363 2364
}

static void __exit vmx_exit(void)
{
2365 2366 2367
	__free_page(vmx_io_bitmap_b);
	__free_page(vmx_io_bitmap_a);

A
Avi Kivity 已提交
2368 2369 2370 2371 2372
	kvm_exit_arch();
}

module_init(vmx_init)
module_exit(vmx_exit)