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KVM: MMU: make the __nonpaging_map function generic
[deliverable/linux.git] / arch / x86 / kvm / x86.c
CommitLineData
043405e1
CO		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * derived from drivers/kvm/kvm_main.c
5 *
6 * Copyright (C) 2006 Qumranet, Inc.
7 *
8 * Authors:
9 * Avi Kivity <avi@qumranet.com>
10 * Yaniv Kamay <yaniv@qumranet.com>
11 *
12 * This work is licensed under the terms of the GNU GPL, version 2. See
13 * the COPYING file in the top-level directory.
14 *
15 */
16
edf88417 17#include <linux/kvm_host.h>
5fb76f9b 18#include "segment_descriptor.h"
313a3dc7 19#include "irq.h"
1d737c8a 20#include "mmu.h"
313a3dc7
CO		 21
22#include <linux/kvm.h>
23#include <linux/fs.h>
24#include <linux/vmalloc.h>
5fb76f9b 25#include <linux/module.h>
0de10343 26#include <linux/mman.h>
2bacc55c 27#include <linux/highmem.h>
043405e1
CO		 28
29#include <asm/uaccess.h>
d825ed0a 30#include <asm/msr.h>
043405e1 31
313a3dc7 32#define MAX_IO_MSRS 256
a03490ed
CO		 33#define CR0_RESERVED_BITS \
34 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
35 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
36 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
37#define CR4_RESERVED_BITS \
38 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
39 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
40 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
41 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
42
43#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
50a37eb4
JR		 44/* EFER defaults:
45 * - enable syscall per default because its emulated by KVM
46 * - enable LME and LMA per default on 64 bit KVM
47 */
48#ifdef CONFIG_X86_64
49static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
50#else
51static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
52#endif
313a3dc7 53
ba1389b7
AK		 54#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
55#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
417bc304 56
674eea0f
AK		 57static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
58 struct kvm_cpuid_entry2 __user *entries);
59
97896d04
ZX		 60struct kvm_x86_ops *kvm_x86_ops;
61
417bc304 62struct kvm_stats_debugfs_item debugfs_entries[] = {
ba1389b7
AK		 63 { "pf_fixed", VCPU_STAT(pf_fixed) },
64 { "pf_guest", VCPU_STAT(pf_guest) },
65 { "tlb_flush", VCPU_STAT(tlb_flush) },
66 { "invlpg", VCPU_STAT(invlpg) },
67 { "exits", VCPU_STAT(exits) },
68 { "io_exits", VCPU_STAT(io_exits) },
69 { "mmio_exits", VCPU_STAT(mmio_exits) },
70 { "signal_exits", VCPU_STAT(signal_exits) },
71 { "irq_window", VCPU_STAT(irq_window_exits) },
72 { "halt_exits", VCPU_STAT(halt_exits) },
73 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
74 { "request_irq", VCPU_STAT(request_irq_exits) },
75 { "irq_exits", VCPU_STAT(irq_exits) },
76 { "host_state_reload", VCPU_STAT(host_state_reload) },
77 { "efer_reload", VCPU_STAT(efer_reload) },
78 { "fpu_reload", VCPU_STAT(fpu_reload) },
79 { "insn_emulation", VCPU_STAT(insn_emulation) },
80 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
4cee5764
AK		 81 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
82 { "mmu_pte_write", VM_STAT(mmu_pte_write) },
83 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
84 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
85 { "mmu_flooded", VM_STAT(mmu_flooded) },
86 { "mmu_recycled", VM_STAT(mmu_recycled) },
dfc5aa00 87 { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
0f74a24c 88 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
417bc304
HB		 89 { NULL }
90};
91
92
5fb76f9b
CO		 93unsigned long segment_base(u16 selector)
94{
95 struct descriptor_table gdt;
96 struct segment_descriptor *d;
97 unsigned long table_base;
98 unsigned long v;
99
100 if (selector == 0)
101 return 0;
102
103 asm("sgdt %0" : "=m"(gdt));
104 table_base = gdt.base;
105
106 if (selector & 4) { /* from ldt */
107 u16 ldt_selector;
108
109 asm("sldt %0" : "=g"(ldt_selector));
110 table_base = segment_base(ldt_selector);
111 }
112 d = (struct segment_descriptor *)(table_base + (selector & ~7));
113 v = d->base_low | ((unsigned long)d->base_mid << 16) |
114 ((unsigned long)d->base_high << 24);
115#ifdef CONFIG_X86_64
116 if (d->system == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
117 v |= ((unsigned long) \
118 ((struct segment_descriptor_64 *)d)->base_higher) << 32;
119#endif
120 return v;
121}
122EXPORT_SYMBOL_GPL(segment_base);
123
6866b83e
CO		 124u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
125{
126 if (irqchip_in_kernel(vcpu->kvm))
ad312c7c 127 return vcpu->arch.apic_base;
6866b83e 128 else
ad312c7c 129 return vcpu->arch.apic_base;
6866b83e
CO		 130}
131EXPORT_SYMBOL_GPL(kvm_get_apic_base);
132
133void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
134{
135 /* TODO: reserve bits check */
136 if (irqchip_in_kernel(vcpu->kvm))
137 kvm_lapic_set_base(vcpu, data);
138 else
ad312c7c 139 vcpu->arch.apic_base = data;
6866b83e
CO		 140}
141EXPORT_SYMBOL_GPL(kvm_set_apic_base);
142
298101da
AK		 143void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
144{
ad312c7c
ZX		 145 WARN_ON(vcpu->arch.exception.pending);
146 vcpu->arch.exception.pending = true;
147 vcpu->arch.exception.has_error_code = false;
148 vcpu->arch.exception.nr = nr;
298101da
AK		 149}
150EXPORT_SYMBOL_GPL(kvm_queue_exception);
151
c3c91fee
AK		 152void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
153 u32 error_code)
154{
155 ++vcpu->stat.pf_guest;
ad312c7c 156 if (vcpu->arch.exception.pending && vcpu->arch.exception.nr == PF_VECTOR) {
c3c91fee
AK		 157 printk(KERN_DEBUG "kvm: inject_page_fault:"
158 " double fault 0x%lx\n", addr);
ad312c7c
ZX		 159 vcpu->arch.exception.nr = DF_VECTOR;
160 vcpu->arch.exception.error_code = 0;
c3c91fee
AK		 161 return;
162 }
ad312c7c 163 vcpu->arch.cr2 = addr;
c3c91fee
AK		 164 kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
165}
166
298101da
AK		 167void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
168{
ad312c7c
ZX		 169 WARN_ON(vcpu->arch.exception.pending);
170 vcpu->arch.exception.pending = true;
171 vcpu->arch.exception.has_error_code = true;
172 vcpu->arch.exception.nr = nr;
173 vcpu->arch.exception.error_code = error_code;
298101da
AK		 174}
175EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
176
177static void __queue_exception(struct kvm_vcpu *vcpu)
178{
ad312c7c
ZX		 179 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
180 vcpu->arch.exception.has_error_code,
181 vcpu->arch.exception.error_code);
298101da
AK		 182}
183
a03490ed
CO		 184/*
185 * Load the pae pdptrs. Return true is they are all valid.
186 */
187int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
188{
189 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
190 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
191 int i;
192 int ret;
ad312c7c 193 u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
a03490ed 194
72dc67a6 195 down_read(&vcpu->kvm->slots_lock);
a03490ed
CO		 196 ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
197 offset * sizeof(u64), sizeof(pdpte));
198 if (ret < 0) {
199 ret = 0;
200 goto out;
201 }
202 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
203 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
204 ret = 0;
205 goto out;
206 }
207 }
208 ret = 1;
209
ad312c7c 210 memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
a03490ed 211out:
72dc67a6 212 up_read(&vcpu->kvm->slots_lock);
a03490ed
CO		 213
214 return ret;
215}
216
d835dfec
AK		 217static bool pdptrs_changed(struct kvm_vcpu *vcpu)
218{
ad312c7c 219 u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
d835dfec
AK		 220 bool changed = true;
221 int r;
222
223 if (is_long_mode(vcpu) || !is_pae(vcpu))
224 return false;
225
72dc67a6 226 down_read(&vcpu->kvm->slots_lock);
ad312c7c 227 r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
d835dfec
AK		 228 if (r < 0)
229 goto out;
ad312c7c 230 changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
d835dfec 231out:
72dc67a6 232 up_read(&vcpu->kvm->slots_lock);
d835dfec
AK		 233
234 return changed;
235}
236
a03490ed
CO		 237void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
238{
239 if (cr0 & CR0_RESERVED_BITS) {
240 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
ad312c7c 241 cr0, vcpu->arch.cr0);
c1a5d4f9 242 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 243 return;
244 }
245
246 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
247 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
c1a5d4f9 248 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 249 return;
250 }
251
252 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
253 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
254 "and a clear PE flag\n");
c1a5d4f9 255 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 256 return;
257 }
258
259 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
260#ifdef CONFIG_X86_64
ad312c7c 261 if ((vcpu->arch.shadow_efer & EFER_LME)) {
a03490ed
CO		 262 int cs_db, cs_l;
263
264 if (!is_pae(vcpu)) {
265 printk(KERN_DEBUG "set_cr0: #GP, start paging "
266 "in long mode while PAE is disabled\n");
c1a5d4f9 267 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 268 return;
269 }
270 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
271 if (cs_l) {
272 printk(KERN_DEBUG "set_cr0: #GP, start paging "
273 "in long mode while CS.L == 1\n");
c1a5d4f9 274 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 275 return;
276
277 }
278 } else
279#endif
ad312c7c 280 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
a03490ed
CO		 281 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
282 "reserved bits\n");
c1a5d4f9 283 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 284 return;
285 }
286
287 }
288
289 kvm_x86_ops->set_cr0(vcpu, cr0);
ad312c7c 290 vcpu->arch.cr0 = cr0;
a03490ed 291
a03490ed 292 kvm_mmu_reset_context(vcpu);
a03490ed
CO		 293 return;
294}
295EXPORT_SYMBOL_GPL(set_cr0);
296
297void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
298{
ad312c7c 299 set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
a03490ed
CO		 300}
301EXPORT_SYMBOL_GPL(lmsw);
302
303void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
304{
305 if (cr4 & CR4_RESERVED_BITS) {
306 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
c1a5d4f9 307 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 308 return;
309 }
310
311 if (is_long_mode(vcpu)) {
312 if (!(cr4 & X86_CR4_PAE)) {
313 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
314 "in long mode\n");
c1a5d4f9 315 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 316 return;
317 }
318 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
ad312c7c 319 && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
a03490ed 320 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
c1a5d4f9 321 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 322 return;
323 }
324
325 if (cr4 & X86_CR4_VMXE) {
326 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
c1a5d4f9 327 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 328 return;
329 }
330 kvm_x86_ops->set_cr4(vcpu, cr4);
ad312c7c 331 vcpu->arch.cr4 = cr4;
a03490ed 332 kvm_mmu_reset_context(vcpu);
a03490ed
CO		 333}
334EXPORT_SYMBOL_GPL(set_cr4);
335
336void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
337{
ad312c7c 338 if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
d835dfec
AK		 339 kvm_mmu_flush_tlb(vcpu);
340 return;
341 }
342
a03490ed
CO		 343 if (is_long_mode(vcpu)) {
344 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
345 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
c1a5d4f9 346 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 347 return;
348 }
349 } else {
350 if (is_pae(vcpu)) {
351 if (cr3 & CR3_PAE_RESERVED_BITS) {
352 printk(KERN_DEBUG
353 "set_cr3: #GP, reserved bits\n");
c1a5d4f9 354 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 355 return;
356 }
357 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
358 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
359 "reserved bits\n");
c1a5d4f9 360 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 361 return;
362 }
363 }
364 /*
365 * We don't check reserved bits in nonpae mode, because
366 * this isn't enforced, and VMware depends on this.
367 */
368 }
369
72dc67a6 370 down_read(&vcpu->kvm->slots_lock);
a03490ed
CO		 371 /*
372 * Does the new cr3 value map to physical memory? (Note, we
373 * catch an invalid cr3 even in real-mode, because it would
374 * cause trouble later on when we turn on paging anyway.)
375 *
376 * A real CPU would silently accept an invalid cr3 and would
377 * attempt to use it - with largely undefined (and often hard
378 * to debug) behavior on the guest side.
379 */
380 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
c1a5d4f9 381 kvm_inject_gp(vcpu, 0);
a03490ed 382 else {
ad312c7c
ZX		 383 vcpu->arch.cr3 = cr3;
384 vcpu->arch.mmu.new_cr3(vcpu);
a03490ed 385 }
72dc67a6 386 up_read(&vcpu->kvm->slots_lock);
a03490ed
CO		 387}
388EXPORT_SYMBOL_GPL(set_cr3);
389
390void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
391{
392 if (cr8 & CR8_RESERVED_BITS) {
393 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
c1a5d4f9 394 kvm_inject_gp(vcpu, 0);
a03490ed
CO		 395 return;
396 }
397 if (irqchip_in_kernel(vcpu->kvm))
398 kvm_lapic_set_tpr(vcpu, cr8);
399 else
ad312c7c 400 vcpu->arch.cr8 = cr8;
a03490ed
CO		 401}
402EXPORT_SYMBOL_GPL(set_cr8);
403
404unsigned long get_cr8(struct kvm_vcpu *vcpu)
405{
406 if (irqchip_in_kernel(vcpu->kvm))
407 return kvm_lapic_get_cr8(vcpu);
408 else
ad312c7c 409 return vcpu->arch.cr8;
a03490ed
CO		 410}
411EXPORT_SYMBOL_GPL(get_cr8);
412
043405e1
CO		 413/*
414 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
415 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
416 *
417 * This list is modified at module load time to reflect the
418 * capabilities of the host cpu.
419 */
420static u32 msrs_to_save[] = {
421 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
422 MSR_K6_STAR,
423#ifdef CONFIG_X86_64
424 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
425#endif
426 MSR_IA32_TIME_STAMP_COUNTER,
427};
428
429static unsigned num_msrs_to_save;
430
431static u32 emulated_msrs[] = {
432 MSR_IA32_MISC_ENABLE,
433};
434
15c4a640
CO		 435static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
436{
f2b4b7dd 437 if (efer & efer_reserved_bits) {
15c4a640
CO		 438 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
439 efer);
c1a5d4f9 440 kvm_inject_gp(vcpu, 0);
15c4a640
CO		 441 return;
442 }
443
444 if (is_paging(vcpu)
ad312c7c 445 && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) {
15c4a640 446 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
c1a5d4f9 447 kvm_inject_gp(vcpu, 0);
15c4a640
CO		 448 return;
449 }
450
451 kvm_x86_ops->set_efer(vcpu, efer);
452
453 efer &= ~EFER_LMA;
ad312c7c 454 efer |= vcpu->arch.shadow_efer & EFER_LMA;
15c4a640 455
ad312c7c 456 vcpu->arch.shadow_efer = efer;
15c4a640
CO		 457}
458
f2b4b7dd
JR		 459void kvm_enable_efer_bits(u64 mask)
460{
461 efer_reserved_bits &= ~mask;
462}
463EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
464
465
15c4a640
CO		 466/*
467 * Writes msr value into into the appropriate "register".
468 * Returns 0 on success, non-0 otherwise.
469 * Assumes vcpu_load() was already called.
470 */
471int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
472{
473 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
474}
475
313a3dc7
CO		 476/*
477 * Adapt set_msr() to msr_io()'s calling convention
478 */
479static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
480{
481 return kvm_set_msr(vcpu, index, *data);
482}
483
15c4a640
CO		 484
485int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
486{
487 switch (msr) {
15c4a640
CO		 488 case MSR_EFER:
489 set_efer(vcpu, data);
490 break;
15c4a640
CO		 491 case MSR_IA32_MC0_STATUS:
492 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
493 __FUNCTION__, data);
494 break;
495 case MSR_IA32_MCG_STATUS:
496 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
497 __FUNCTION__, data);
498 break;
c7ac679c
JR		 499 case MSR_IA32_MCG_CTL:
500 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
501 __FUNCTION__, data);
502 break;
15c4a640
CO		 503 case MSR_IA32_UCODE_REV:
504 case MSR_IA32_UCODE_WRITE:
505 case 0x200 ... 0x2ff: /* MTRRs */
506 break;
507 case MSR_IA32_APICBASE:
508 kvm_set_apic_base(vcpu, data);
509 break;
510 case MSR_IA32_MISC_ENABLE:
ad312c7c 511 vcpu->arch.ia32_misc_enable_msr = data;
15c4a640
CO		 512 break;
513 default:
565f1fbd 514 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data);
15c4a640
CO		 515 return 1;
516 }
517 return 0;
518}
519EXPORT_SYMBOL_GPL(kvm_set_msr_common);
520
521
522/*
523 * Reads an msr value (of 'msr_index') into 'pdata'.
524 * Returns 0 on success, non-0 otherwise.
525 * Assumes vcpu_load() was already called.
526 */
527int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
528{
529 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
530}
531
532int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
533{
534 u64 data;
535
536 switch (msr) {
537 case 0xc0010010: /* SYSCFG */
538 case 0xc0010015: /* HWCR */
539 case MSR_IA32_PLATFORM_ID:
540 case MSR_IA32_P5_MC_ADDR:
541 case MSR_IA32_P5_MC_TYPE:
542 case MSR_IA32_MC0_CTL:
543 case MSR_IA32_MCG_STATUS:
544 case MSR_IA32_MCG_CAP:
c7ac679c 545 case MSR_IA32_MCG_CTL:
15c4a640
CO		 546 case MSR_IA32_MC0_MISC:
547 case MSR_IA32_MC0_MISC+4:
548 case MSR_IA32_MC0_MISC+8:
549 case MSR_IA32_MC0_MISC+12:
550 case MSR_IA32_MC0_MISC+16:
551 case MSR_IA32_UCODE_REV:
552 case MSR_IA32_PERF_STATUS:
553 case MSR_IA32_EBL_CR_POWERON:
554 /* MTRR registers */
555 case 0xfe:
556 case 0x200 ... 0x2ff:
557 data = 0;
558 break;
559 case 0xcd: /* fsb frequency */
560 data = 3;
561 break;
562 case MSR_IA32_APICBASE:
563 data = kvm_get_apic_base(vcpu);
564 break;
565 case MSR_IA32_MISC_ENABLE:
ad312c7c 566 data = vcpu->arch.ia32_misc_enable_msr;
15c4a640 567 break;
15c4a640 568 case MSR_EFER:
ad312c7c 569 data = vcpu->arch.shadow_efer;
15c4a640 570 break;
15c4a640
CO		 571 default:
572 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
573 return 1;
574 }
575 *pdata = data;
576 return 0;
577}
578EXPORT_SYMBOL_GPL(kvm_get_msr_common);
579
313a3dc7
CO		 580/*
581 * Read or write a bunch of msrs. All parameters are kernel addresses.
582 *
583 * @return number of msrs set successfully.
584 */
585static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
586 struct kvm_msr_entry *entries,
587 int (*do_msr)(struct kvm_vcpu *vcpu,
588 unsigned index, u64 *data))
589{
590 int i;
591
592 vcpu_load(vcpu);
593
594 for (i = 0; i < msrs->nmsrs; ++i)
595 if (do_msr(vcpu, entries[i].index, &entries[i].data))
596 break;
597
598 vcpu_put(vcpu);
599
600 return i;
601}
602
603/*
604 * Read or write a bunch of msrs. Parameters are user addresses.
605 *
606 * @return number of msrs set successfully.
607 */
608static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
609 int (*do_msr)(struct kvm_vcpu *vcpu,
610 unsigned index, u64 *data),
611 int writeback)
612{
613 struct kvm_msrs msrs;
614 struct kvm_msr_entry *entries;
615 int r, n;
616 unsigned size;
617
618 r = -EFAULT;
619 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
620 goto out;
621
622 r = -E2BIG;
623 if (msrs.nmsrs >= MAX_IO_MSRS)
624 goto out;
625
626 r = -ENOMEM;
627 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
628 entries = vmalloc(size);
629 if (!entries)
630 goto out;
631
632 r = -EFAULT;
633 if (copy_from_user(entries, user_msrs->entries, size))
634 goto out_free;
635
636 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
637 if (r < 0)
638 goto out_free;
639
640 r = -EFAULT;
641 if (writeback && copy_to_user(user_msrs->entries, entries, size))
642 goto out_free;
643
644 r = n;
645
646out_free:
647 vfree(entries);
648out:
649 return r;
650}
651
e9b11c17
ZX		 652/*
653 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
654 * cached on it.
655 */
656void decache_vcpus_on_cpu(int cpu)
657{
658 struct kvm *vm;
659 struct kvm_vcpu *vcpu;
660 int i;
661
662 spin_lock(&kvm_lock);
663 list_for_each_entry(vm, &vm_list, vm_list)
664 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
665 vcpu = vm->vcpus[i];
666 if (!vcpu)
667 continue;
668 /*
669 * If the vcpu is locked, then it is running on some
670 * other cpu and therefore it is not cached on the
671 * cpu in question.
672 *
673 * If it's not locked, check the last cpu it executed
674 * on.
675 */
676 if (mutex_trylock(&vcpu->mutex)) {
677 if (vcpu->cpu == cpu) {
678 kvm_x86_ops->vcpu_decache(vcpu);
679 vcpu->cpu = -1;
680 }
681 mutex_unlock(&vcpu->mutex);
682 }
683 }
684 spin_unlock(&kvm_lock);
685}
686
018d00d2
ZX		 687int kvm_dev_ioctl_check_extension(long ext)
688{
689 int r;
690
691 switch (ext) {
692 case KVM_CAP_IRQCHIP:
693 case KVM_CAP_HLT:
694 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
695 case KVM_CAP_USER_MEMORY:
696 case KVM_CAP_SET_TSS_ADDR:
07716717 697 case KVM_CAP_EXT_CPUID:
018d00d2
ZX		 698 r = 1;
699 break;
774ead3a
AK		 700 case KVM_CAP_VAPIC:
701 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
702 break;
018d00d2
ZX		 703 default:
704 r = 0;
705 break;
706 }
707 return r;
708
709}
710
043405e1
CO		 711long kvm_arch_dev_ioctl(struct file *filp,
712 unsigned int ioctl, unsigned long arg)
713{
714 void __user *argp = (void __user *)arg;
715 long r;
716
717 switch (ioctl) {
718 case KVM_GET_MSR_INDEX_LIST: {
719 struct kvm_msr_list __user *user_msr_list = argp;
720 struct kvm_msr_list msr_list;
721 unsigned n;
722
723 r = -EFAULT;
724 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
725 goto out;
726 n = msr_list.nmsrs;
727 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
728 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
729 goto out;
730 r = -E2BIG;
731 if (n < num_msrs_to_save)
732 goto out;
733 r = -EFAULT;
734 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
735 num_msrs_to_save * sizeof(u32)))
736 goto out;
737 if (copy_to_user(user_msr_list->indices
738 + num_msrs_to_save * sizeof(u32),
739 &emulated_msrs,
740 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
741 goto out;
742 r = 0;
743 break;
744 }
674eea0f
AK		 745 case KVM_GET_SUPPORTED_CPUID: {
746 struct kvm_cpuid2 __user *cpuid_arg = argp;
747 struct kvm_cpuid2 cpuid;
748
749 r = -EFAULT;
750 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
751 goto out;
752 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
753 cpuid_arg->entries);
754 if (r)
755 goto out;
756
757 r = -EFAULT;
758 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
759 goto out;
760 r = 0;
761 break;
762 }
043405e1
CO		 763 default:
764 r = -EINVAL;
765 }
766out:
767 return r;
768}
769
313a3dc7
CO		 770void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
771{
772 kvm_x86_ops->vcpu_load(vcpu, cpu);
773}
774
775void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
776{
777 kvm_x86_ops->vcpu_put(vcpu);
9327fd11 778 kvm_put_guest_fpu(vcpu);
313a3dc7
CO		 779}
780
07716717 781static int is_efer_nx(void)
313a3dc7
CO		 782{
783 u64 efer;
313a3dc7
CO		 784
785 rdmsrl(MSR_EFER, efer);
07716717
DK		 786 return efer & EFER_NX;
787}
788
789static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
790{
791 int i;
792 struct kvm_cpuid_entry2 *e, *entry;
793
313a3dc7 794 entry = NULL;
ad312c7c
ZX		 795 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
796 e = &vcpu->arch.cpuid_entries[i];
313a3dc7
CO		 797 if (e->function == 0x80000001) {
798 entry = e;
799 break;
800 }
801 }
07716717 802 if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
313a3dc7
CO		 803 entry->edx &= ~(1 << 20);
804 printk(KERN_INFO "kvm: guest NX capability removed\n");
805 }
806}
807
07716717 808/* when an old userspace process fills a new kernel module */
313a3dc7
CO		 809static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
810 struct kvm_cpuid *cpuid,
811 struct kvm_cpuid_entry __user *entries)
07716717
DK		 812{
813 int r, i;
814 struct kvm_cpuid_entry *cpuid_entries;
815
816 r = -E2BIG;
817 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
818 goto out;
819 r = -ENOMEM;
820 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
821 if (!cpuid_entries)
822 goto out;
823 r = -EFAULT;
824 if (copy_from_user(cpuid_entries, entries,
825 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
826 goto out_free;
827 for (i = 0; i < cpuid->nent; i++) {
ad312c7c
ZX		 828 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
829 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
830 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
831 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
832 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
833 vcpu->arch.cpuid_entries[i].index = 0;
834 vcpu->arch.cpuid_entries[i].flags = 0;
835 vcpu->arch.cpuid_entries[i].padding[0] = 0;
836 vcpu->arch.cpuid_entries[i].padding[1] = 0;
837 vcpu->arch.cpuid_entries[i].padding[2] = 0;
838 }
839 vcpu->arch.cpuid_nent = cpuid->nent;
07716717
DK		 840 cpuid_fix_nx_cap(vcpu);
841 r = 0;
842
843out_free:
844 vfree(cpuid_entries);
845out:
846 return r;
847}
848
849static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
850 struct kvm_cpuid2 *cpuid,
851 struct kvm_cpuid_entry2 __user *entries)
313a3dc7
CO		 852{
853 int r;
854
855 r = -E2BIG;
856 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
857 goto out;
858 r = -EFAULT;
ad312c7c 859 if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
07716717 860 cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
313a3dc7 861 goto out;
ad312c7c 862 vcpu->arch.cpuid_nent = cpuid->nent;
313a3dc7
CO		 863 return 0;
864
865out:
866 return r;
867}
868
07716717
DK		 869static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
870 struct kvm_cpuid2 *cpuid,
871 struct kvm_cpuid_entry2 __user *entries)
872{
873 int r;
874
875 r = -E2BIG;
ad312c7c 876 if (cpuid->nent < vcpu->arch.cpuid_nent)
07716717
DK		 877 goto out;
878 r = -EFAULT;
ad312c7c
ZX		 879 if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
880 vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
07716717
DK		 881 goto out;
882 return 0;
883
884out:
ad312c7c 885 cpuid->nent = vcpu->arch.cpuid_nent;
07716717
DK		 886 return r;
887}
888
889static inline u32 bit(int bitno)
890{
891 return 1 << (bitno & 31);
892}
893
894static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
895 u32 index)
896{
897 entry->function = function;
898 entry->index = index;
899 cpuid_count(entry->function, entry->index,
900 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
901 entry->flags = 0;
902}
903
904static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
905 u32 index, int *nent, int maxnent)
906{
907 const u32 kvm_supported_word0_x86_features = bit(X86_FEATURE_FPU) |
908 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
909 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
910 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
911 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
912 bit(X86_FEATURE_SEP) | bit(X86_FEATURE_PGE) |
913 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
914 bit(X86_FEATURE_CLFLSH) | bit(X86_FEATURE_MMX) |
915 bit(X86_FEATURE_FXSR) | bit(X86_FEATURE_XMM) |
916 bit(X86_FEATURE_XMM2) | bit(X86_FEATURE_SELFSNOOP);
917 const u32 kvm_supported_word1_x86_features = bit(X86_FEATURE_FPU) |
918 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
919 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
920 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
921 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
922 bit(X86_FEATURE_PGE) |
923 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
924 bit(X86_FEATURE_MMX) | bit(X86_FEATURE_FXSR) |
925 bit(X86_FEATURE_SYSCALL) |
926 (bit(X86_FEATURE_NX) && is_efer_nx()) |
927#ifdef CONFIG_X86_64
928 bit(X86_FEATURE_LM) |
929#endif
930 bit(X86_FEATURE_MMXEXT) |
931 bit(X86_FEATURE_3DNOWEXT) |
932 bit(X86_FEATURE_3DNOW);
933 const u32 kvm_supported_word3_x86_features =
934 bit(X86_FEATURE_XMM3) | bit(X86_FEATURE_CX16);
935 const u32 kvm_supported_word6_x86_features =
936 bit(X86_FEATURE_LAHF_LM) | bit(X86_FEATURE_CMP_LEGACY);
937
938 /* all func 2 cpuid_count() should be called on the same cpu */
939 get_cpu();
940 do_cpuid_1_ent(entry, function, index);
941 ++*nent;
942
943 switch (function) {
944 case 0:
945 entry->eax = min(entry->eax, (u32)0xb);
946 break;
947 case 1:
948 entry->edx &= kvm_supported_word0_x86_features;
949 entry->ecx &= kvm_supported_word3_x86_features;
950 break;
951 /* function 2 entries are STATEFUL. That is, repeated cpuid commands
952 * may return different values. This forces us to get_cpu() before
953 * issuing the first command, and also to emulate this annoying behavior
954 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
955 case 2: {
956 int t, times = entry->eax & 0xff;
957
958 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
959 for (t = 1; t < times && *nent < maxnent; ++t) {
960 do_cpuid_1_ent(&entry[t], function, 0);
961 entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
962 ++*nent;
963 }
964 break;
965 }
966 /* function 4 and 0xb have additional index. */
967 case 4: {
968 int index, cache_type;
969
970 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
971 /* read more entries until cache_type is zero */
972 for (index = 1; *nent < maxnent; ++index) {
973 cache_type = entry[index - 1].eax & 0x1f;
974 if (!cache_type)
975 break;
976 do_cpuid_1_ent(&entry[index], function, index);
977 entry[index].flags |=
978 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
979 ++*nent;
980 }
981 break;
982 }
983 case 0xb: {
984 int index, level_type;
985
986 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
987 /* read more entries until level_type is zero */
988 for (index = 1; *nent < maxnent; ++index) {
989 level_type = entry[index - 1].ecx & 0xff;
990 if (!level_type)
991 break;
992 do_cpuid_1_ent(&entry[index], function, index);
993 entry[index].flags |=
994 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
995 ++*nent;
996 }
997 break;
998 }
999 case 0x80000000:
1000 entry->eax = min(entry->eax, 0x8000001a);
1001 break;
1002 case 0x80000001:
1003 entry->edx &= kvm_supported_word1_x86_features;
1004 entry->ecx &= kvm_supported_word6_x86_features;
1005 break;
1006 }
1007 put_cpu();
1008}
1009
674eea0f 1010static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
07716717
DK		 1011 struct kvm_cpuid_entry2 __user *entries)
1012{
1013 struct kvm_cpuid_entry2 *cpuid_entries;
1014 int limit, nent = 0, r = -E2BIG;
1015 u32 func;
1016
1017 if (cpuid->nent < 1)
1018 goto out;
1019 r = -ENOMEM;
1020 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
1021 if (!cpuid_entries)
1022 goto out;
1023
1024 do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
1025 limit = cpuid_entries[0].eax;
1026 for (func = 1; func <= limit && nent < cpuid->nent; ++func)
1027 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1028 &nent, cpuid->nent);
1029 r = -E2BIG;
1030 if (nent >= cpuid->nent)
1031 goto out_free;
1032
1033 do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
1034 limit = cpuid_entries[nent - 1].eax;
1035 for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
1036 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1037 &nent, cpuid->nent);
1038 r = -EFAULT;
1039 if (copy_to_user(entries, cpuid_entries,
1040 nent * sizeof(struct kvm_cpuid_entry2)))
1041 goto out_free;
1042 cpuid->nent = nent;
1043 r = 0;
1044
1045out_free:
1046 vfree(cpuid_entries);
1047out:
1048 return r;
1049}
1050
313a3dc7
CO		 1051static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
1052 struct kvm_lapic_state *s)
1053{
1054 vcpu_load(vcpu);
ad312c7c 1055 memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
313a3dc7
CO		 1056 vcpu_put(vcpu);
1057
1058 return 0;
1059}
1060
1061static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
1062 struct kvm_lapic_state *s)
1063{
1064 vcpu_load(vcpu);
ad312c7c 1065 memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
313a3dc7
CO		 1066 kvm_apic_post_state_restore(vcpu);
1067 vcpu_put(vcpu);
1068
1069 return 0;
1070}
1071
f77bc6a4
ZX		 1072static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1073 struct kvm_interrupt *irq)
1074{
1075 if (irq->irq < 0 || irq->irq >= 256)
1076 return -EINVAL;
1077 if (irqchip_in_kernel(vcpu->kvm))
1078 return -ENXIO;
1079 vcpu_load(vcpu);
1080
ad312c7c
ZX		 1081 set_bit(irq->irq, vcpu->arch.irq_pending);
1082 set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
f77bc6a4
ZX		 1083
1084 vcpu_put(vcpu);
1085
1086 return 0;
1087}
1088
b209749f
AK		 1089static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
1090 struct kvm_tpr_access_ctl *tac)
1091{
1092 if (tac->flags)
1093 return -EINVAL;
1094 vcpu->arch.tpr_access_reporting = !!tac->enabled;
1095 return 0;
1096}
1097
313a3dc7
CO		 1098long kvm_arch_vcpu_ioctl(struct file *filp,
1099 unsigned int ioctl, unsigned long arg)
1100{
1101 struct kvm_vcpu *vcpu = filp->private_data;
1102 void __user *argp = (void __user *)arg;
1103 int r;
1104
1105 switch (ioctl) {
1106 case KVM_GET_LAPIC: {
1107 struct kvm_lapic_state lapic;
1108
1109 memset(&lapic, 0, sizeof lapic);
1110 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
1111 if (r)
1112 goto out;
1113 r = -EFAULT;
1114 if (copy_to_user(argp, &lapic, sizeof lapic))
1115 goto out;
1116 r = 0;
1117 break;
1118 }
1119 case KVM_SET_LAPIC: {
1120 struct kvm_lapic_state lapic;
1121
1122 r = -EFAULT;
1123 if (copy_from_user(&lapic, argp, sizeof lapic))
1124 goto out;
1125 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
1126 if (r)
1127 goto out;
1128 r = 0;
1129 break;
1130 }
f77bc6a4
ZX		 1131 case KVM_INTERRUPT: {
1132 struct kvm_interrupt irq;
1133
1134 r = -EFAULT;
1135 if (copy_from_user(&irq, argp, sizeof irq))
1136 goto out;
1137 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
1138 if (r)
1139 goto out;
1140 r = 0;
1141 break;
1142 }
313a3dc7
CO		 1143 case KVM_SET_CPUID: {
1144 struct kvm_cpuid __user *cpuid_arg = argp;
1145 struct kvm_cpuid cpuid;
1146
1147 r = -EFAULT;
1148 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1149 goto out;
1150 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
1151 if (r)
1152 goto out;
1153 break;
1154 }
07716717
DK		 1155 case KVM_SET_CPUID2: {
1156 struct kvm_cpuid2 __user *cpuid_arg = argp;
1157 struct kvm_cpuid2 cpuid;
1158
1159 r = -EFAULT;
1160 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1161 goto out;
1162 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
1163 cpuid_arg->entries);
1164 if (r)
1165 goto out;
1166 break;
1167 }
1168 case KVM_GET_CPUID2: {
1169 struct kvm_cpuid2 __user *cpuid_arg = argp;
1170 struct kvm_cpuid2 cpuid;
1171
1172 r = -EFAULT;
1173 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1174 goto out;
1175 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
1176 cpuid_arg->entries);
1177 if (r)
1178 goto out;
1179 r = -EFAULT;
1180 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1181 goto out;
1182 r = 0;
1183 break;
1184 }
313a3dc7
CO		 1185 case KVM_GET_MSRS:
1186 r = msr_io(vcpu, argp, kvm_get_msr, 1);
1187 break;
1188 case KVM_SET_MSRS:
1189 r = msr_io(vcpu, argp, do_set_msr, 0);
1190 break;
b209749f
AK		 1191 case KVM_TPR_ACCESS_REPORTING: {
1192 struct kvm_tpr_access_ctl tac;
1193
1194 r = -EFAULT;
1195 if (copy_from_user(&tac, argp, sizeof tac))
1196 goto out;
1197 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
1198 if (r)
1199 goto out;
1200 r = -EFAULT;
1201 if (copy_to_user(argp, &tac, sizeof tac))
1202 goto out;
1203 r = 0;
1204 break;
1205 };
b93463aa
AK		 1206 case KVM_SET_VAPIC_ADDR: {
1207 struct kvm_vapic_addr va;
1208
1209 r = -EINVAL;
1210 if (!irqchip_in_kernel(vcpu->kvm))
1211 goto out;
1212 r = -EFAULT;
1213 if (copy_from_user(&va, argp, sizeof va))
1214 goto out;
1215 r = 0;
1216 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
1217 break;
1218 }
313a3dc7
CO		 1219 default:
1220 r = -EINVAL;
1221 }
1222out:
1223 return r;
1224}
1225
1fe779f8
CO		 1226static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
1227{
1228 int ret;
1229
1230 if (addr > (unsigned int)(-3 * PAGE_SIZE))
1231 return -1;
1232 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
1233 return ret;
1234}
1235
1236static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
1237 u32 kvm_nr_mmu_pages)
1238{
1239 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
1240 return -EINVAL;
1241
72dc67a6 1242 down_write(&kvm->slots_lock);
1fe779f8
CO		 1243
1244 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
f05e70ac 1245 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1fe779f8 1246
72dc67a6 1247 up_write(&kvm->slots_lock);
1fe779f8
CO		 1248 return 0;
1249}
1250
1251static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
1252{
f05e70ac 1253 return kvm->arch.n_alloc_mmu_pages;
1fe779f8
CO		 1254}
1255
e9f85cde
ZX		 1256gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
1257{
1258 int i;
1259 struct kvm_mem_alias *alias;
1260
d69fb81f
ZX		 1261 for (i = 0; i < kvm->arch.naliases; ++i) {
1262 alias = &kvm->arch.aliases[i];
e9f85cde
ZX		 1263 if (gfn >= alias->base_gfn
1264 && gfn < alias->base_gfn + alias->npages)
1265 return alias->target_gfn + gfn - alias->base_gfn;
1266 }
1267 return gfn;
1268}
1269
1fe779f8
CO		 1270/*
1271 * Set a new alias region. Aliases map a portion of physical memory into
1272 * another portion. This is useful for memory windows, for example the PC
1273 * VGA region.
1274 */
1275static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
1276 struct kvm_memory_alias *alias)
1277{
1278 int r, n;
1279 struct kvm_mem_alias *p;
1280
1281 r = -EINVAL;
1282 /* General sanity checks */
1283 if (alias->memory_size & (PAGE_SIZE - 1))
1284 goto out;
1285 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
1286 goto out;
1287 if (alias->slot >= KVM_ALIAS_SLOTS)
1288 goto out;
1289 if (alias->guest_phys_addr + alias->memory_size
1290 < alias->guest_phys_addr)
1291 goto out;
1292 if (alias->target_phys_addr + alias->memory_size
1293 < alias->target_phys_addr)
1294 goto out;
1295
72dc67a6 1296 down_write(&kvm->slots_lock);
1fe779f8 1297
d69fb81f 1298 p = &kvm->arch.aliases[alias->slot];
1fe779f8
CO		 1299 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
1300 p->npages = alias->memory_size >> PAGE_SHIFT;
1301 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
1302
1303 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
d69fb81f 1304 if (kvm->arch.aliases[n - 1].npages)
1fe779f8 1305 break;
d69fb81f 1306 kvm->arch.naliases = n;
1fe779f8
CO		 1307
1308 kvm_mmu_zap_all(kvm);
1309
72dc67a6 1310 up_write(&kvm->slots_lock);
1fe779f8
CO		 1311
1312 return 0;
1313
1314out:
1315 return r;
1316}
1317
1318static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1319{
1320 int r;
1321
1322 r = 0;
1323 switch (chip->chip_id) {
1324 case KVM_IRQCHIP_PIC_MASTER:
1325 memcpy(&chip->chip.pic,
1326 &pic_irqchip(kvm)->pics[0],
1327 sizeof(struct kvm_pic_state));
1328 break;
1329 case KVM_IRQCHIP_PIC_SLAVE:
1330 memcpy(&chip->chip.pic,
1331 &pic_irqchip(kvm)->pics[1],
1332 sizeof(struct kvm_pic_state));
1333 break;
1334 case KVM_IRQCHIP_IOAPIC:
1335 memcpy(&chip->chip.ioapic,
1336 ioapic_irqchip(kvm),
1337 sizeof(struct kvm_ioapic_state));
1338 break;
1339 default:
1340 r = -EINVAL;
1341 break;
1342 }
1343 return r;
1344}
1345
1346static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1347{
1348 int r;
1349
1350 r = 0;
1351 switch (chip->chip_id) {
1352 case KVM_IRQCHIP_PIC_MASTER:
1353 memcpy(&pic_irqchip(kvm)->pics[0],
1354 &chip->chip.pic,
1355 sizeof(struct kvm_pic_state));
1356 break;
1357 case KVM_IRQCHIP_PIC_SLAVE:
1358 memcpy(&pic_irqchip(kvm)->pics[1],
1359 &chip->chip.pic,
1360 sizeof(struct kvm_pic_state));
1361 break;
1362 case KVM_IRQCHIP_IOAPIC:
1363 memcpy(ioapic_irqchip(kvm),
1364 &chip->chip.ioapic,
1365 sizeof(struct kvm_ioapic_state));
1366 break;
1367 default:
1368 r = -EINVAL;
1369 break;
1370 }
1371 kvm_pic_update_irq(pic_irqchip(kvm));
1372 return r;
1373}
1374
5bb064dc
ZX		 1375/*
1376 * Get (and clear) the dirty memory log for a memory slot.
1377 */
1378int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1379 struct kvm_dirty_log *log)
1380{
1381 int r;
1382 int n;
1383 struct kvm_memory_slot *memslot;
1384 int is_dirty = 0;
1385
72dc67a6 1386 down_write(&kvm->slots_lock);
5bb064dc
ZX		 1387
1388 r = kvm_get_dirty_log(kvm, log, &is_dirty);
1389 if (r)
1390 goto out;
1391
1392 /* If nothing is dirty, don't bother messing with page tables. */
1393 if (is_dirty) {
1394 kvm_mmu_slot_remove_write_access(kvm, log->slot);
1395 kvm_flush_remote_tlbs(kvm);
1396 memslot = &kvm->memslots[log->slot];
1397 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1398 memset(memslot->dirty_bitmap, 0, n);
1399 }
1400 r = 0;
1401out:
72dc67a6 1402 up_write(&kvm->slots_lock);
5bb064dc
ZX		 1403 return r;
1404}
1405
1fe779f8
CO		 1406long kvm_arch_vm_ioctl(struct file *filp,
1407 unsigned int ioctl, unsigned long arg)
1408{
1409 struct kvm *kvm = filp->private_data;
1410 void __user *argp = (void __user *)arg;
1411 int r = -EINVAL;
1412
1413 switch (ioctl) {
1414 case KVM_SET_TSS_ADDR:
1415 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
1416 if (r < 0)
1417 goto out;
1418 break;
1419 case KVM_SET_MEMORY_REGION: {
1420 struct kvm_memory_region kvm_mem;
1421 struct kvm_userspace_memory_region kvm_userspace_mem;
1422
1423 r = -EFAULT;
1424 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1425 goto out;
1426 kvm_userspace_mem.slot = kvm_mem.slot;
1427 kvm_userspace_mem.flags = kvm_mem.flags;
1428 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
1429 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
1430 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
1431 if (r)
1432 goto out;
1433 break;
1434 }
1435 case KVM_SET_NR_MMU_PAGES:
1436 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
1437 if (r)
1438 goto out;
1439 break;
1440 case KVM_GET_NR_MMU_PAGES:
1441 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
1442 break;
1443 case KVM_SET_MEMORY_ALIAS: {
1444 struct kvm_memory_alias alias;
1445
1446 r = -EFAULT;
1447 if (copy_from_user(&alias, argp, sizeof alias))
1448 goto out;
1449 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
1450 if (r)
1451 goto out;
1452 break;
1453 }
1454 case KVM_CREATE_IRQCHIP:
1455 r = -ENOMEM;
d7deeeb0
ZX		 1456 kvm->arch.vpic = kvm_create_pic(kvm);
1457 if (kvm->arch.vpic) {
1fe779f8
CO		 1458 r = kvm_ioapic_init(kvm);
1459 if (r) {
d7deeeb0
ZX		 1460 kfree(kvm->arch.vpic);
1461 kvm->arch.vpic = NULL;
1fe779f8
CO		 1462 goto out;
1463 }
1464 } else
1465 goto out;
1466 break;
1467 case KVM_IRQ_LINE: {
1468 struct kvm_irq_level irq_event;
1469
1470 r = -EFAULT;
1471 if (copy_from_user(&irq_event, argp, sizeof irq_event))
1472 goto out;
1473 if (irqchip_in_kernel(kvm)) {
1474 mutex_lock(&kvm->lock);
1475 if (irq_event.irq < 16)
1476 kvm_pic_set_irq(pic_irqchip(kvm),
1477 irq_event.irq,
1478 irq_event.level);
d7deeeb0 1479 kvm_ioapic_set_irq(kvm->arch.vioapic,
1fe779f8
CO		 1480 irq_event.irq,
1481 irq_event.level);
1482 mutex_unlock(&kvm->lock);
1483 r = 0;
1484 }
1485 break;
1486 }
1487 case KVM_GET_IRQCHIP: {
1488 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1489 struct kvm_irqchip chip;
1490
1491 r = -EFAULT;
1492 if (copy_from_user(&chip, argp, sizeof chip))
1493 goto out;
1494 r = -ENXIO;
1495 if (!irqchip_in_kernel(kvm))
1496 goto out;
1497 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
1498 if (r)
1499 goto out;
1500 r = -EFAULT;
1501 if (copy_to_user(argp, &chip, sizeof chip))
1502 goto out;
1503 r = 0;
1504 break;
1505 }
1506 case KVM_SET_IRQCHIP: {
1507 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1508 struct kvm_irqchip chip;
1509
1510 r = -EFAULT;
1511 if (copy_from_user(&chip, argp, sizeof chip))
1512 goto out;
1513 r = -ENXIO;
1514 if (!irqchip_in_kernel(kvm))
1515 goto out;
1516 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
1517 if (r)
1518 goto out;
1519 r = 0;
1520 break;
1521 }
1522 default:
1523 ;
1524 }
1525out:
1526 return r;
1527}
1528
a16b043c 1529static void kvm_init_msr_list(void)
043405e1
CO		 1530{
1531 u32 dummy[2];
1532 unsigned i, j;
1533
1534 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1535 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1536 continue;
1537 if (j < i)
1538 msrs_to_save[j] = msrs_to_save[i];
1539 j++;
1540 }
1541 num_msrs_to_save = j;
1542}
1543
bbd9b64e
CO		 1544/*
1545 * Only apic need an MMIO device hook, so shortcut now..
1546 */
1547static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1548 gpa_t addr)
1549{
1550 struct kvm_io_device *dev;
1551
ad312c7c
ZX		 1552 if (vcpu->arch.apic) {
1553 dev = &vcpu->arch.apic->dev;
bbd9b64e
CO		 1554 if (dev->in_range(dev, addr))
1555 return dev;
1556 }
1557 return NULL;
1558}
1559
1560
1561static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1562 gpa_t addr)
1563{
1564 struct kvm_io_device *dev;
1565
1566 dev = vcpu_find_pervcpu_dev(vcpu, addr);
1567 if (dev == NULL)
1568 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1569 return dev;
1570}
1571
1572int emulator_read_std(unsigned long addr,
1573 void *val,
1574 unsigned int bytes,
1575 struct kvm_vcpu *vcpu)
1576{
1577 void *data = val;
10589a46 1578 int r = X86EMUL_CONTINUE;
bbd9b64e 1579
72dc67a6 1580 down_read(&vcpu->kvm->slots_lock);
bbd9b64e 1581 while (bytes) {
ad312c7c 1582 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
bbd9b64e
CO		 1583 unsigned offset = addr & (PAGE_SIZE-1);
1584 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1585 int ret;
1586
10589a46
MT		 1587 if (gpa == UNMAPPED_GVA) {
1588 r = X86EMUL_PROPAGATE_FAULT;
1589 goto out;
1590 }
bbd9b64e 1591 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
10589a46
MT		 1592 if (ret < 0) {
1593 r = X86EMUL_UNHANDLEABLE;
1594 goto out;
1595 }
bbd9b64e
CO		 1596
1597 bytes -= tocopy;
1598 data += tocopy;
1599 addr += tocopy;
1600 }
10589a46 1601out:
72dc67a6 1602 up_read(&vcpu->kvm->slots_lock);
10589a46 1603 return r;
bbd9b64e
CO		 1604}
1605EXPORT_SYMBOL_GPL(emulator_read_std);
1606
bbd9b64e
CO		 1607static int emulator_read_emulated(unsigned long addr,
1608 void *val,
1609 unsigned int bytes,
1610 struct kvm_vcpu *vcpu)
1611{
1612 struct kvm_io_device *mmio_dev;
1613 gpa_t gpa;
1614
1615 if (vcpu->mmio_read_completed) {
1616 memcpy(val, vcpu->mmio_data, bytes);
1617 vcpu->mmio_read_completed = 0;
1618 return X86EMUL_CONTINUE;
1619 }
1620
72dc67a6 1621 down_read(&vcpu->kvm->slots_lock);
ad312c7c 1622 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
72dc67a6 1623 up_read(&vcpu->kvm->slots_lock);
bbd9b64e
CO		 1624
1625 /* For APIC access vmexit */
1626 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1627 goto mmio;
1628
1629 if (emulator_read_std(addr, val, bytes, vcpu)
1630 == X86EMUL_CONTINUE)
1631 return X86EMUL_CONTINUE;
1632 if (gpa == UNMAPPED_GVA)
1633 return X86EMUL_PROPAGATE_FAULT;
1634
1635mmio:
1636 /*
1637 * Is this MMIO handled locally?
1638 */
10589a46 1639 mutex_lock(&vcpu->kvm->lock);
bbd9b64e
CO		 1640 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1641 if (mmio_dev) {
1642 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
10589a46 1643 mutex_unlock(&vcpu->kvm->lock);
bbd9b64e
CO		 1644 return X86EMUL_CONTINUE;
1645 }
10589a46 1646 mutex_unlock(&vcpu->kvm->lock);
bbd9b64e
CO		 1647
1648 vcpu->mmio_needed = 1;
1649 vcpu->mmio_phys_addr = gpa;
1650 vcpu->mmio_size = bytes;
1651 vcpu->mmio_is_write = 0;
1652
1653 return X86EMUL_UNHANDLEABLE;
1654}
1655
1656static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1657 const void *val, int bytes)
1658{
1659 int ret;
1660
72dc67a6 1661 down_read(&vcpu->kvm->slots_lock);
bbd9b64e 1662 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
10589a46 1663 if (ret < 0) {
72dc67a6 1664 up_read(&vcpu->kvm->slots_lock);
bbd9b64e 1665 return 0;
10589a46 1666 }
bbd9b64e 1667 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
72dc67a6 1668 up_read(&vcpu->kvm->slots_lock);
bbd9b64e
CO		 1669 return 1;
1670}
1671
1672static int emulator_write_emulated_onepage(unsigned long addr,
1673 const void *val,
1674 unsigned int bytes,
1675 struct kvm_vcpu *vcpu)
1676{
1677 struct kvm_io_device *mmio_dev;
10589a46
MT		 1678 gpa_t gpa;
1679
72dc67a6 1680 down_read(&vcpu->kvm->slots_lock);
10589a46 1681 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
72dc67a6 1682 up_read(&vcpu->kvm->slots_lock);
bbd9b64e
CO		 1683
1684 if (gpa == UNMAPPED_GVA) {
c3c91fee 1685 kvm_inject_page_fault(vcpu, addr, 2);
bbd9b64e
CO		 1686 return X86EMUL_PROPAGATE_FAULT;
1687 }
1688
1689 /* For APIC access vmexit */
1690 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1691 goto mmio;
1692
1693 if (emulator_write_phys(vcpu, gpa, val, bytes))
1694 return X86EMUL_CONTINUE;
1695
1696mmio:
1697 /*
1698 * Is this MMIO handled locally?
1699 */
10589a46 1700 mutex_lock(&vcpu->kvm->lock);
bbd9b64e
CO		 1701 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1702 if (mmio_dev) {
1703 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
10589a46 1704 mutex_unlock(&vcpu->kvm->lock);
bbd9b64e
CO		 1705 return X86EMUL_CONTINUE;
1706 }
10589a46 1707 mutex_unlock(&vcpu->kvm->lock);
bbd9b64e
CO		 1708
1709 vcpu->mmio_needed = 1;
1710 vcpu->mmio_phys_addr = gpa;
1711 vcpu->mmio_size = bytes;
1712 vcpu->mmio_is_write = 1;
1713 memcpy(vcpu->mmio_data, val, bytes);
1714
1715 return X86EMUL_CONTINUE;
1716}
1717
1718int emulator_write_emulated(unsigned long addr,
1719 const void *val,
1720 unsigned int bytes,
1721 struct kvm_vcpu *vcpu)
1722{
1723 /* Crossing a page boundary? */
1724 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1725 int rc, now;
1726
1727 now = -addr & ~PAGE_MASK;
1728 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1729 if (rc != X86EMUL_CONTINUE)
1730 return rc;
1731 addr += now;
1732 val += now;
1733 bytes -= now;
1734 }
1735 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1736}
1737EXPORT_SYMBOL_GPL(emulator_write_emulated);
1738
1739static int emulator_cmpxchg_emulated(unsigned long addr,
1740 const void *old,
1741 const void *new,
1742 unsigned int bytes,
1743 struct kvm_vcpu *vcpu)
1744{
1745 static int reported;
1746
1747 if (!reported) {
1748 reported = 1;
1749 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1750 }
2bacc55c
MT		 1751#ifndef CONFIG_X86_64
1752 /* guests cmpxchg8b have to be emulated atomically */
1753 if (bytes == 8) {
10589a46 1754 gpa_t gpa;
2bacc55c 1755 struct page *page;
c0b49b0d 1756 char *kaddr;
2bacc55c
MT		 1757 u64 val;
1758
72dc67a6 1759 down_read(&vcpu->kvm->slots_lock);
10589a46
MT		 1760 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1761
2bacc55c
MT		 1762 if (gpa == UNMAPPED_GVA ||
1763 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1764 goto emul_write;
1765
1766 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
1767 goto emul_write;
1768
1769 val = *(u64 *)new;
72dc67a6
IE		 1770
1771 down_read(&current->mm->mmap_sem);
2bacc55c 1772 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
72dc67a6
IE		 1773 up_read(&current->mm->mmap_sem);
1774
c0b49b0d
AM		 1775 kaddr = kmap_atomic(page, KM_USER0);
1776 set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
1777 kunmap_atomic(kaddr, KM_USER0);
2bacc55c 1778 kvm_release_page_dirty(page);
10589a46 1779 emul_write:
72dc67a6 1780 up_read(&vcpu->kvm->slots_lock);
2bacc55c 1781 }
2bacc55c
MT		 1782#endif
1783
bbd9b64e
CO		 1784 return emulator_write_emulated(addr, new, bytes, vcpu);
1785}
1786
1787static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1788{
1789 return kvm_x86_ops->get_segment_base(vcpu, seg);
1790}
1791
1792int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1793{
1794 return X86EMUL_CONTINUE;
1795}
1796
1797int emulate_clts(struct kvm_vcpu *vcpu)
1798{
ad312c7c 1799 kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
bbd9b64e
CO		 1800 return X86EMUL_CONTINUE;
1801}
1802
1803int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
1804{
1805 struct kvm_vcpu *vcpu = ctxt->vcpu;
1806
1807 switch (dr) {
1808 case 0 ... 3:
1809 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1810 return X86EMUL_CONTINUE;
1811 default:
1812 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1813 return X86EMUL_UNHANDLEABLE;
1814 }
1815}
1816
1817int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1818{
1819 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1820 int exception;
1821
1822 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1823 if (exception) {
1824 /* FIXME: better handling */
1825 return X86EMUL_UNHANDLEABLE;
1826 }
1827 return X86EMUL_CONTINUE;
1828}
1829
1830void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
1831{
1832 static int reported;
1833 u8 opcodes[4];
ad312c7c 1834 unsigned long rip = vcpu->arch.rip;
bbd9b64e
CO		 1835 unsigned long rip_linear;
1836
1837 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
1838
1839 if (reported)
1840 return;
1841
1842 emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
1843
1844 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
1845 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1846 reported = 1;
1847}
1848EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
1849
1850struct x86_emulate_ops emulate_ops = {
1851 .read_std = emulator_read_std,
bbd9b64e
CO		 1852 .read_emulated = emulator_read_emulated,
1853 .write_emulated = emulator_write_emulated,
1854 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1855};
1856
1857int emulate_instruction(struct kvm_vcpu *vcpu,
1858 struct kvm_run *run,
1859 unsigned long cr2,
1860 u16 error_code,
571008da 1861 int emulation_type)
bbd9b64e
CO		 1862{
1863 int r;
571008da 1864 struct decode_cache *c;
bbd9b64e 1865
ad312c7c 1866 vcpu->arch.mmio_fault_cr2 = cr2;
bbd9b64e
CO		 1867 kvm_x86_ops->cache_regs(vcpu);
1868
1869 vcpu->mmio_is_write = 0;
ad312c7c 1870 vcpu->arch.pio.string = 0;
bbd9b64e 1871
571008da 1872 if (!(emulation_type & EMULTYPE_NO_DECODE)) {
bbd9b64e
CO		 1873 int cs_db, cs_l;
1874 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1875
ad312c7c
ZX		 1876 vcpu->arch.emulate_ctxt.vcpu = vcpu;
1877 vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
1878 vcpu->arch.emulate_ctxt.mode =
1879 (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
bbd9b64e
CO		 1880 ? X86EMUL_MODE_REAL : cs_l
1881 ? X86EMUL_MODE_PROT64 : cs_db
1882 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1883
ad312c7c
ZX		 1884 if (vcpu->arch.emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1885 vcpu->arch.emulate_ctxt.cs_base = 0;
1886 vcpu->arch.emulate_ctxt.ds_base = 0;
1887 vcpu->arch.emulate_ctxt.es_base = 0;
1888 vcpu->arch.emulate_ctxt.ss_base = 0;
bbd9b64e 1889 } else {
ad312c7c 1890 vcpu->arch.emulate_ctxt.cs_base =
bbd9b64e 1891 get_segment_base(vcpu, VCPU_SREG_CS);
ad312c7c 1892 vcpu->arch.emulate_ctxt.ds_base =
bbd9b64e 1893 get_segment_base(vcpu, VCPU_SREG_DS);
ad312c7c 1894 vcpu->arch.emulate_ctxt.es_base =
bbd9b64e 1895 get_segment_base(vcpu, VCPU_SREG_ES);
ad312c7c 1896 vcpu->arch.emulate_ctxt.ss_base =
bbd9b64e
CO		 1897 get_segment_base(vcpu, VCPU_SREG_SS);
1898 }
1899
ad312c7c 1900 vcpu->arch.emulate_ctxt.gs_base =
bbd9b64e 1901 get_segment_base(vcpu, VCPU_SREG_GS);
ad312c7c 1902 vcpu->arch.emulate_ctxt.fs_base =
bbd9b64e
CO		 1903 get_segment_base(vcpu, VCPU_SREG_FS);
1904
ad312c7c 1905 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
571008da
SY		 1906
1907 /* Reject the instructions other than VMCALL/VMMCALL when
1908 * try to emulate invalid opcode */
1909 c = &vcpu->arch.emulate_ctxt.decode;
1910 if ((emulation_type & EMULTYPE_TRAP_UD) &&
1911 (!(c->twobyte && c->b == 0x01 &&
1912 (c->modrm_reg == 0 || c->modrm_reg == 3) &&
1913 c->modrm_mod == 3 && c->modrm_rm == 1)))
1914 return EMULATE_FAIL;
1915
f2b5756b 1916 ++vcpu->stat.insn_emulation;
bbd9b64e 1917 if (r) {
f2b5756b 1918 ++vcpu->stat.insn_emulation_fail;
bbd9b64e
CO		 1919 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1920 return EMULATE_DONE;
1921 return EMULATE_FAIL;
1922 }
1923 }
1924
ad312c7c 1925 r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
bbd9b64e 1926
ad312c7c 1927 if (vcpu->arch.pio.string)
bbd9b64e
CO		 1928 return EMULATE_DO_MMIO;
1929
1930 if ((r || vcpu->mmio_is_write) && run) {
1931 run->exit_reason = KVM_EXIT_MMIO;
1932 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1933 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1934 run->mmio.len = vcpu->mmio_size;
1935 run->mmio.is_write = vcpu->mmio_is_write;
1936 }
1937
1938 if (r) {
1939 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1940 return EMULATE_DONE;
1941 if (!vcpu->mmio_needed) {
1942 kvm_report_emulation_failure(vcpu, "mmio");
1943 return EMULATE_FAIL;
1944 }
1945 return EMULATE_DO_MMIO;
1946 }
1947
1948 kvm_x86_ops->decache_regs(vcpu);
ad312c7c 1949 kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
bbd9b64e
CO		 1950
1951 if (vcpu->mmio_is_write) {
1952 vcpu->mmio_needed = 0;
1953 return EMULATE_DO_MMIO;
1954 }
1955
1956 return EMULATE_DONE;
1957}
1958EXPORT_SYMBOL_GPL(emulate_instruction);
1959
de7d789a
CO		 1960static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
1961{
1962 int i;
1963
ad312c7c
ZX		 1964 for (i = 0; i < ARRAY_SIZE(vcpu->arch.pio.guest_pages); ++i)
1965 if (vcpu->arch.pio.guest_pages[i]) {
1966 kvm_release_page_dirty(vcpu->arch.pio.guest_pages[i]);
1967 vcpu->arch.pio.guest_pages[i] = NULL;
de7d789a
CO		 1968 }
1969}
1970
1971static int pio_copy_data(struct kvm_vcpu *vcpu)
1972{
ad312c7c 1973 void *p = vcpu->arch.pio_data;
de7d789a
CO		 1974 void *q;
1975 unsigned bytes;
ad312c7c 1976 int nr_pages = vcpu->arch.pio.guest_pages[1] ? 2 : 1;
de7d789a 1977
ad312c7c 1978 q = vmap(vcpu->arch.pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
de7d789a
CO		 1979 PAGE_KERNEL);
1980 if (!q) {
1981 free_pio_guest_pages(vcpu);
1982 return -ENOMEM;
1983 }
ad312c7c
ZX		 1984 q += vcpu->arch.pio.guest_page_offset;
1985 bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
1986 if (vcpu->arch.pio.in)
de7d789a
CO		 1987 memcpy(q, p, bytes);
1988 else
1989 memcpy(p, q, bytes);
ad312c7c 1990 q -= vcpu->arch.pio.guest_page_offset;
de7d789a
CO		 1991 vunmap(q);
1992 free_pio_guest_pages(vcpu);
1993 return 0;
1994}
1995
1996int complete_pio(struct kvm_vcpu *vcpu)
1997{
ad312c7c 1998 struct kvm_pio_request *io = &vcpu->arch.pio;
de7d789a
CO		 1999 long delta;
2000 int r;
2001
2002 kvm_x86_ops->cache_regs(vcpu);
2003
2004 if (!io->string) {
2005 if (io->in)
ad312c7c 2006 memcpy(&vcpu->arch.regs[VCPU_REGS_RAX], vcpu->arch.pio_data,
de7d789a
CO		 2007 io->size);
2008 } else {
2009 if (io->in) {
2010 r = pio_copy_data(vcpu);
2011 if (r) {
2012 kvm_x86_ops->cache_regs(vcpu);
2013 return r;
2014 }
2015 }
2016
2017 delta = 1;
2018 if (io->rep) {
2019 delta *= io->cur_count;
2020 /*
2021 * The size of the register should really depend on
2022 * current address size.
2023 */
ad312c7c 2024 vcpu->arch.regs[VCPU_REGS_RCX] -= delta;
de7d789a
CO		 2025 }
2026 if (io->down)
2027 delta = -delta;
2028 delta *= io->size;
2029 if (io->in)
ad312c7c 2030 vcpu->arch.regs[VCPU_REGS_RDI] += delta;
de7d789a 2031 else
ad312c7c 2032 vcpu->arch.regs[VCPU_REGS_RSI] += delta;
de7d789a
CO		 2033 }
2034
2035 kvm_x86_ops->decache_regs(vcpu);
2036
2037 io->count -= io->cur_count;
2038 io->cur_count = 0;
2039
2040 return 0;
2041}
2042
2043static void kernel_pio(struct kvm_io_device *pio_dev,
2044 struct kvm_vcpu *vcpu,
2045 void *pd)
2046{
2047 /* TODO: String I/O for in kernel device */
2048
2049 mutex_lock(&vcpu->kvm->lock);
ad312c7c
ZX		 2050 if (vcpu->arch.pio.in)
2051 kvm_iodevice_read(pio_dev, vcpu->arch.pio.port,
2052 vcpu->arch.pio.size,
de7d789a
CO		 2053 pd);
2054 else
ad312c7c
ZX		 2055 kvm_iodevice_write(pio_dev, vcpu->arch.pio.port,
2056 vcpu->arch.pio.size,
de7d789a
CO		 2057 pd);
2058 mutex_unlock(&vcpu->kvm->lock);
2059}
2060
2061static void pio_string_write(struct kvm_io_device *pio_dev,
2062 struct kvm_vcpu *vcpu)
2063{
ad312c7c
ZX		 2064 struct kvm_pio_request *io = &vcpu->arch.pio;
2065 void *pd = vcpu->arch.pio_data;
de7d789a
CO		 2066 int i;
2067
2068 mutex_lock(&vcpu->kvm->lock);
2069 for (i = 0; i < io->cur_count; i++) {
2070 kvm_iodevice_write(pio_dev, io->port,
2071 io->size,
2072 pd);
2073 pd += io->size;
2074 }
2075 mutex_unlock(&vcpu->kvm->lock);
2076}
2077
2078static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
2079 gpa_t addr)
2080{
2081 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
2082}
2083
2084int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2085 int size, unsigned port)
2086{
2087 struct kvm_io_device *pio_dev;
2088
2089 vcpu->run->exit_reason = KVM_EXIT_IO;
2090 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
ad312c7c 2091 vcpu->run->io.size = vcpu->arch.pio.size = size;
de7d789a 2092 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
ad312c7c
ZX		 2093 vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1;
2094 vcpu->run->io.port = vcpu->arch.pio.port = port;
2095 vcpu->arch.pio.in = in;
2096 vcpu->arch.pio.string = 0;
2097 vcpu->arch.pio.down = 0;
2098 vcpu->arch.pio.guest_page_offset = 0;
2099 vcpu->arch.pio.rep = 0;
de7d789a
CO		 2100
2101 kvm_x86_ops->cache_regs(vcpu);
ad312c7c 2102 memcpy(vcpu->arch.pio_data, &vcpu->arch.regs[VCPU_REGS_RAX], 4);
de7d789a
CO		 2103 kvm_x86_ops->decache_regs(vcpu);
2104
2105 kvm_x86_ops->skip_emulated_instruction(vcpu);
2106
2107 pio_dev = vcpu_find_pio_dev(vcpu, port);
2108 if (pio_dev) {
ad312c7c 2109 kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
de7d789a
CO		 2110 complete_pio(vcpu);
2111 return 1;
2112 }
2113 return 0;
2114}
2115EXPORT_SYMBOL_GPL(kvm_emulate_pio);
2116
2117int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2118 int size, unsigned long count, int down,
2119 gva_t address, int rep, unsigned port)
2120{
2121 unsigned now, in_page;
2122 int i, ret = 0;
2123 int nr_pages = 1;
2124 struct page *page;
2125 struct kvm_io_device *pio_dev;
2126
2127 vcpu->run->exit_reason = KVM_EXIT_IO;
2128 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
ad312c7c 2129 vcpu->run->io.size = vcpu->arch.pio.size = size;
de7d789a 2130 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
ad312c7c
ZX		 2131 vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count;
2132 vcpu->run->io.port = vcpu->arch.pio.port = port;
2133 vcpu->arch.pio.in = in;
2134 vcpu->arch.pio.string = 1;
2135 vcpu->arch.pio.down = down;
2136 vcpu->arch.pio.guest_page_offset = offset_in_page(address);
2137 vcpu->arch.pio.rep = rep;
de7d789a
CO		 2138
2139 if (!count) {
2140 kvm_x86_ops->skip_emulated_instruction(vcpu);
2141 return 1;
2142 }
2143
2144 if (!down)
2145 in_page = PAGE_SIZE - offset_in_page(address);
2146 else
2147 in_page = offset_in_page(address) + size;
2148 now = min(count, (unsigned long)in_page / size);
2149 if (!now) {
2150 /*
2151 * String I/O straddles page boundary. Pin two guest pages
2152 * so that we satisfy atomicity constraints. Do just one
2153 * transaction to avoid complexity.
2154 */
2155 nr_pages = 2;
2156 now = 1;
2157 }
2158 if (down) {
2159 /*
2160 * String I/O in reverse. Yuck. Kill the guest, fix later.
2161 */
2162 pr_unimpl(vcpu, "guest string pio down\n");
c1a5d4f9 2163 kvm_inject_gp(vcpu, 0);
de7d789a
CO		 2164 return 1;
2165 }
2166 vcpu->run->io.count = now;
ad312c7c 2167 vcpu->arch.pio.cur_count = now;
de7d789a 2168
ad312c7c 2169 if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
de7d789a
CO		 2170 kvm_x86_ops->skip_emulated_instruction(vcpu);
2171
2172 for (i = 0; i < nr_pages; ++i) {
72dc67a6 2173 down_read(&vcpu->kvm->slots_lock);
de7d789a 2174 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
ad312c7c 2175 vcpu->arch.pio.guest_pages[i] = page;
72dc67a6 2176 up_read(&vcpu->kvm->slots_lock);
de7d789a 2177 if (!page) {
c1a5d4f9 2178 kvm_inject_gp(vcpu, 0);
de7d789a
CO		 2179 free_pio_guest_pages(vcpu);
2180 return 1;
2181 }
2182 }
2183
2184 pio_dev = vcpu_find_pio_dev(vcpu, port);
ad312c7c 2185 if (!vcpu->arch.pio.in) {
de7d789a
CO		 2186 /* string PIO write */
2187 ret = pio_copy_data(vcpu);
2188 if (ret >= 0 && pio_dev) {
2189 pio_string_write(pio_dev, vcpu);
2190 complete_pio(vcpu);
ad312c7c 2191 if (vcpu->arch.pio.count == 0)
de7d789a
CO		 2192 ret = 1;
2193 }
2194 } else if (pio_dev)
2195 pr_unimpl(vcpu, "no string pio read support yet, "
2196 "port %x size %d count %ld\n",
2197 port, size, count);
2198
2199 return ret;
2200}
2201EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
2202
f8c16bba 2203int kvm_arch_init(void *opaque)
043405e1 2204{
56c6d28a 2205 int r;
f8c16bba
ZX		 2206 struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
2207
f8c16bba
ZX		 2208 if (kvm_x86_ops) {
2209 printk(KERN_ERR "kvm: already loaded the other module\n");
56c6d28a
ZX		 2210 r = -EEXIST;
2211 goto out;
f8c16bba
ZX		 2212 }
2213
2214 if (!ops->cpu_has_kvm_support()) {
2215 printk(KERN_ERR "kvm: no hardware support\n");
56c6d28a
ZX		 2216 r = -EOPNOTSUPP;
2217 goto out;
f8c16bba
ZX		 2218 }
2219 if (ops->disabled_by_bios()) {
2220 printk(KERN_ERR "kvm: disabled by bios\n");
56c6d28a
ZX		 2221 r = -EOPNOTSUPP;
2222 goto out;
f8c16bba
ZX		 2223 }
2224
97db56ce
AK		 2225 r = kvm_mmu_module_init();
2226 if (r)
2227 goto out;
2228
2229 kvm_init_msr_list();
2230
f8c16bba 2231 kvm_x86_ops = ops;
56c6d28a 2232 kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
f8c16bba 2233 return 0;
56c6d28a
ZX		 2234
2235out:
56c6d28a 2236 return r;
043405e1 2237}
8776e519 2238
f8c16bba
ZX		 2239void kvm_arch_exit(void)
2240{
2241 kvm_x86_ops = NULL;
56c6d28a
ZX		 2242 kvm_mmu_module_exit();
2243}
f8c16bba 2244
8776e519
HB		 2245int kvm_emulate_halt(struct kvm_vcpu *vcpu)
2246{
2247 ++vcpu->stat.halt_exits;
2248 if (irqchip_in_kernel(vcpu->kvm)) {
ad312c7c 2249 vcpu->arch.mp_state = VCPU_MP_STATE_HALTED;
8776e519 2250 kvm_vcpu_block(vcpu);
ad312c7c 2251 if (vcpu->arch.mp_state != VCPU_MP_STATE_RUNNABLE)
8776e519
HB		 2252 return -EINTR;
2253 return 1;
2254 } else {
2255 vcpu->run->exit_reason = KVM_EXIT_HLT;
2256 return 0;
2257 }
2258}
2259EXPORT_SYMBOL_GPL(kvm_emulate_halt);
2260
2261int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
2262{
2263 unsigned long nr, a0, a1, a2, a3, ret;
2264
2265 kvm_x86_ops->cache_regs(vcpu);
2266
ad312c7c
ZX		 2267 nr = vcpu->arch.regs[VCPU_REGS_RAX];
2268 a0 = vcpu->arch.regs[VCPU_REGS_RBX];
2269 a1 = vcpu->arch.regs[VCPU_REGS_RCX];
2270 a2 = vcpu->arch.regs[VCPU_REGS_RDX];
2271 a3 = vcpu->arch.regs[VCPU_REGS_RSI];
8776e519
HB		 2272
2273 if (!is_long_mode(vcpu)) {
2274 nr &= 0xFFFFFFFF;
2275 a0 &= 0xFFFFFFFF;
2276 a1 &= 0xFFFFFFFF;
2277 a2 &= 0xFFFFFFFF;
2278 a3 &= 0xFFFFFFFF;
2279 }
2280
2281 switch (nr) {
b93463aa
AK		 2282 case KVM_HC_VAPIC_POLL_IRQ:
2283 ret = 0;
2284 break;
8776e519
HB		 2285 default:
2286 ret = -KVM_ENOSYS;
2287 break;
2288 }
ad312c7c 2289 vcpu->arch.regs[VCPU_REGS_RAX] = ret;
8776e519
HB		 2290 kvm_x86_ops->decache_regs(vcpu);
2291 return 0;
2292}
2293EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
2294
2295int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
2296{
2297 char instruction[3];
2298 int ret = 0;
2299
8776e519
HB		 2300
2301 /*
2302 * Blow out the MMU to ensure that no other VCPU has an active mapping
2303 * to ensure that the updated hypercall appears atomically across all
2304 * VCPUs.
2305 */
2306 kvm_mmu_zap_all(vcpu->kvm);
2307
2308 kvm_x86_ops->cache_regs(vcpu);
2309 kvm_x86_ops->patch_hypercall(vcpu, instruction);
ad312c7c 2310 if (emulator_write_emulated(vcpu->arch.rip, instruction, 3, vcpu)
8776e519
HB		 2311 != X86EMUL_CONTINUE)
2312 ret = -EFAULT;
2313
8776e519
HB		 2314 return ret;
2315}
2316
2317static u64 mk_cr_64(u64 curr_cr, u32 new_val)
2318{
2319 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
2320}
2321
2322void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2323{
2324 struct descriptor_table dt = { limit, base };
2325
2326 kvm_x86_ops->set_gdt(vcpu, &dt);
2327}
2328
2329void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2330{
2331 struct descriptor_table dt = { limit, base };
2332
2333 kvm_x86_ops->set_idt(vcpu, &dt);
2334}
2335
2336void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
2337 unsigned long *rflags)
2338{
2339 lmsw(vcpu, msw);
2340 *rflags = kvm_x86_ops->get_rflags(vcpu);
2341}
2342
2343unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
2344{
2345 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2346 switch (cr) {
2347 case 0:
ad312c7c 2348 return vcpu->arch.cr0;
8776e519 2349 case 2:
ad312c7c 2350 return vcpu->arch.cr2;
8776e519 2351 case 3:
ad312c7c 2352 return vcpu->arch.cr3;
8776e519 2353 case 4:
ad312c7c 2354 return vcpu->arch.cr4;
152ff9be
JR		 2355 case 8:
2356 return get_cr8(vcpu);
8776e519
HB		 2357 default:
2358 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
2359 return 0;
2360 }
2361}
2362
2363void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
2364 unsigned long *rflags)
2365{
2366 switch (cr) {
2367 case 0:
ad312c7c 2368 set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
8776e519
HB		 2369 *rflags = kvm_x86_ops->get_rflags(vcpu);
2370 break;
2371 case 2:
ad312c7c 2372 vcpu->arch.cr2 = val;
8776e519
HB		 2373 break;
2374 case 3:
2375 set_cr3(vcpu, val);
2376 break;
2377 case 4:
ad312c7c 2378 set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
8776e519 2379 break;
152ff9be
JR		 2380 case 8:
2381 set_cr8(vcpu, val & 0xfUL);
2382 break;
8776e519
HB		 2383 default:
2384 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
2385 }
2386}
2387
07716717
DK		 2388static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
2389{
ad312c7c
ZX		 2390 struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
2391 int j, nent = vcpu->arch.cpuid_nent;
07716717
DK		 2392
2393 e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
2394 /* when no next entry is found, the current entry[i] is reselected */
2395 for (j = i + 1; j == i; j = (j + 1) % nent) {
ad312c7c 2396 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
07716717
DK		 2397 if (ej->function == e->function) {
2398 ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2399 return j;
2400 }
2401 }
2402 return 0; /* silence gcc, even though control never reaches here */
2403}
2404
2405/* find an entry with matching function, matching index (if needed), and that
2406 * should be read next (if it's stateful) */
2407static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
2408 u32 function, u32 index)
2409{
2410 if (e->function != function)
2411 return 0;
2412 if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
2413 return 0;
2414 if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
2415 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
2416 return 0;
2417 return 1;
2418}
2419
8776e519
HB		 2420void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
2421{
2422 int i;
07716717
DK		 2423 u32 function, index;
2424 struct kvm_cpuid_entry2 *e, *best;
8776e519
HB		 2425
2426 kvm_x86_ops->cache_regs(vcpu);
ad312c7c
ZX		 2427 function = vcpu->arch.regs[VCPU_REGS_RAX];
2428 index = vcpu->arch.regs[VCPU_REGS_RCX];
2429 vcpu->arch.regs[VCPU_REGS_RAX] = 0;
2430 vcpu->arch.regs[VCPU_REGS_RBX] = 0;
2431 vcpu->arch.regs[VCPU_REGS_RCX] = 0;
2432 vcpu->arch.regs[VCPU_REGS_RDX] = 0;
8776e519 2433 best = NULL;
ad312c7c
ZX		 2434 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
2435 e = &vcpu->arch.cpuid_entries[i];
07716717
DK		 2436 if (is_matching_cpuid_entry(e, function, index)) {
2437 if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
2438 move_to_next_stateful_cpuid_entry(vcpu, i);
8776e519
HB		 2439 best = e;
2440 break;
2441 }
2442 /*
2443 * Both basic or both extended?
2444 */
2445 if (((e->function ^ function) & 0x80000000) == 0)
2446 if (!best || e->function > best->function)
2447 best = e;
2448 }
2449 if (best) {
ad312c7c
ZX		 2450 vcpu->arch.regs[VCPU_REGS_RAX] = best->eax;
2451 vcpu->arch.regs[VCPU_REGS_RBX] = best->ebx;
2452 vcpu->arch.regs[VCPU_REGS_RCX] = best->ecx;
2453 vcpu->arch.regs[VCPU_REGS_RDX] = best->edx;
8776e519
HB		 2454 }
2455 kvm_x86_ops->decache_regs(vcpu);
2456 kvm_x86_ops->skip_emulated_instruction(vcpu);
2457}
2458EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
d0752060 2459
b6c7a5dc
HB		 2460/*
2461 * Check if userspace requested an interrupt window, and that the
2462 * interrupt window is open.
2463 *
2464 * No need to exit to userspace if we already have an interrupt queued.
2465 */
2466static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
2467 struct kvm_run *kvm_run)
2468{
ad312c7c 2469 return (!vcpu->arch.irq_summary &&
b6c7a5dc 2470 kvm_run->request_interrupt_window &&
ad312c7c 2471 vcpu->arch.interrupt_window_open &&
b6c7a5dc
HB		 2472 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
2473}
2474
2475static void post_kvm_run_save(struct kvm_vcpu *vcpu,
2476 struct kvm_run *kvm_run)
2477{
2478 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
2479 kvm_run->cr8 = get_cr8(vcpu);
2480 kvm_run->apic_base = kvm_get_apic_base(vcpu);
2481 if (irqchip_in_kernel(vcpu->kvm))
2482 kvm_run->ready_for_interrupt_injection = 1;
2483 else
2484 kvm_run->ready_for_interrupt_injection =
ad312c7c
ZX		 2485 (vcpu->arch.interrupt_window_open &&
2486 vcpu->arch.irq_summary == 0);
b6c7a5dc
HB		 2487}
2488
b93463aa
AK		 2489static void vapic_enter(struct kvm_vcpu *vcpu)
2490{
2491 struct kvm_lapic *apic = vcpu->arch.apic;
2492 struct page *page;
2493
2494 if (!apic || !apic->vapic_addr)
2495 return;
2496
10589a46 2497 down_read(&current->mm->mmap_sem);
b93463aa 2498 page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
10589a46 2499 up_read(&current->mm->mmap_sem);
72dc67a6
IE		 2500
2501 vcpu->arch.apic->vapic_page = page;
b93463aa
AK		 2502}
2503
2504static void vapic_exit(struct kvm_vcpu *vcpu)
2505{
2506 struct kvm_lapic *apic = vcpu->arch.apic;
2507
2508 if (!apic || !apic->vapic_addr)
2509 return;
2510
2511 kvm_release_page_dirty(apic->vapic_page);
2512 mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2513}
2514
b6c7a5dc
HB		 2515static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2516{
2517 int r;
2518
ad312c7c 2519 if (unlikely(vcpu->arch.mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
b6c7a5dc 2520 pr_debug("vcpu %d received sipi with vector # %x\n",
ad312c7c 2521 vcpu->vcpu_id, vcpu->arch.sipi_vector);
b6c7a5dc
HB		 2522 kvm_lapic_reset(vcpu);
2523 r = kvm_x86_ops->vcpu_reset(vcpu);
2524 if (r)
2525 return r;
ad312c7c 2526 vcpu->arch.mp_state = VCPU_MP_STATE_RUNNABLE;
b6c7a5dc
HB		 2527 }
2528
b93463aa
AK		 2529 vapic_enter(vcpu);
2530
b6c7a5dc
HB		 2531preempted:
2532 if (vcpu->guest_debug.enabled)
2533 kvm_x86_ops->guest_debug_pre(vcpu);
2534
2535again:
2536 r = kvm_mmu_reload(vcpu);
2537 if (unlikely(r))
2538 goto out;
2539
2f52d58c
AK		 2540 if (vcpu->requests) {
2541 if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
2542 __kvm_migrate_apic_timer(vcpu);
b93463aa
AK		 2543 if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
2544 &vcpu->requests)) {
2545 kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS;
2546 r = 0;
2547 goto out;
2548 }
2f52d58c 2549 }
b93463aa 2550
b6c7a5dc
HB		 2551 kvm_inject_pending_timer_irqs(vcpu);
2552
2553 preempt_disable();
2554
2555 kvm_x86_ops->prepare_guest_switch(vcpu);
2556 kvm_load_guest_fpu(vcpu);
2557
2558 local_irq_disable();
2559
6c142801
AK		 2560 if (need_resched()) {
2561 local_irq_enable();
2562 preempt_enable();
2563 r = 1;
2564 goto out;
2565 }
2566
b6c7a5dc
HB		 2567 if (signal_pending(current)) {
2568 local_irq_enable();
2569 preempt_enable();
2570 r = -EINTR;
2571 kvm_run->exit_reason = KVM_EXIT_INTR;
2572 ++vcpu->stat.signal_exits;
2573 goto out;
2574 }
2575
ad312c7c 2576 if (vcpu->arch.exception.pending)
298101da
AK		 2577 __queue_exception(vcpu);
2578 else if (irqchip_in_kernel(vcpu->kvm))
b6c7a5dc 2579 kvm_x86_ops->inject_pending_irq(vcpu);
eb9774f0 2580 else
b6c7a5dc
HB		 2581 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
2582
b93463aa
AK		 2583 kvm_lapic_sync_to_vapic(vcpu);
2584
b6c7a5dc
HB		 2585 vcpu->guest_mode = 1;
2586 kvm_guest_enter();
2587
2588 if (vcpu->requests)
2589 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
2590 kvm_x86_ops->tlb_flush(vcpu);
2591
2592 kvm_x86_ops->run(vcpu, kvm_run);
2593
2594 vcpu->guest_mode = 0;
2595 local_irq_enable();
2596
2597 ++vcpu->stat.exits;
2598
2599 /*
2600 * We must have an instruction between local_irq_enable() and
2601 * kvm_guest_exit(), so the timer interrupt isn't delayed by
2602 * the interrupt shadow. The stat.exits increment will do nicely.
2603 * But we need to prevent reordering, hence this barrier():
2604 */
2605 barrier();
2606
2607 kvm_guest_exit();
2608
2609 preempt_enable();
2610
2611 /*
2612 * Profile KVM exit RIPs:
2613 */
2614 if (unlikely(prof_on == KVM_PROFILING)) {
2615 kvm_x86_ops->cache_regs(vcpu);
ad312c7c 2616 profile_hit(KVM_PROFILING, (void *)vcpu->arch.rip);
b6c7a5dc
HB		 2617 }
2618
ad312c7c
ZX		 2619 if (vcpu->arch.exception.pending && kvm_x86_ops->exception_injected(vcpu))
2620 vcpu->arch.exception.pending = false;
298101da 2621
b93463aa
AK		 2622 kvm_lapic_sync_from_vapic(vcpu);
2623
b6c7a5dc
HB		 2624 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2625
2626 if (r > 0) {
2627 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2628 r = -EINTR;
2629 kvm_run->exit_reason = KVM_EXIT_INTR;
2630 ++vcpu->stat.request_irq_exits;
2631 goto out;
2632 }
e1beb1d3 2633 if (!need_resched())
b6c7a5dc 2634 goto again;
b6c7a5dc
HB		 2635 }
2636
2637out:
2638 if (r > 0) {
2639 kvm_resched(vcpu);
2640 goto preempted;
2641 }
2642
2643 post_kvm_run_save(vcpu, kvm_run);
2644
b93463aa
AK		 2645 vapic_exit(vcpu);
2646
b6c7a5dc
HB		 2647 return r;
2648}
2649
2650int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2651{
2652 int r;
2653 sigset_t sigsaved;
2654
2655 vcpu_load(vcpu);
2656
ad312c7c 2657 if (unlikely(vcpu->arch.mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
b6c7a5dc
HB		 2658 kvm_vcpu_block(vcpu);
2659 vcpu_put(vcpu);
2660 return -EAGAIN;
2661 }
2662
2663 if (vcpu->sigset_active)
2664 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2665
2666 /* re-sync apic's tpr */
2667 if (!irqchip_in_kernel(vcpu->kvm))
2668 set_cr8(vcpu, kvm_run->cr8);
2669
ad312c7c 2670 if (vcpu->arch.pio.cur_count) {
b6c7a5dc
HB		 2671 r = complete_pio(vcpu);
2672 if (r)
2673 goto out;
2674 }
2675#if CONFIG_HAS_IOMEM
2676 if (vcpu->mmio_needed) {
2677 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2678 vcpu->mmio_read_completed = 1;
2679 vcpu->mmio_needed = 0;
2680 r = emulate_instruction(vcpu, kvm_run,
571008da
SY		 2681 vcpu->arch.mmio_fault_cr2, 0,
2682 EMULTYPE_NO_DECODE);
b6c7a5dc
HB		 2683 if (r == EMULATE_DO_MMIO) {
2684 /*
2685 * Read-modify-write. Back to userspace.
2686 */
2687 r = 0;
2688 goto out;
2689 }
2690 }
2691#endif
2692 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2693 kvm_x86_ops->cache_regs(vcpu);
ad312c7c 2694 vcpu->arch.regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
b6c7a5dc
HB		 2695 kvm_x86_ops->decache_regs(vcpu);
2696 }
2697
2698 r = __vcpu_run(vcpu, kvm_run);
2699
2700out:
2701 if (vcpu->sigset_active)
2702 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2703
2704 vcpu_put(vcpu);
2705 return r;
2706}
2707
2708int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2709{
2710 vcpu_load(vcpu);
2711
2712 kvm_x86_ops->cache_regs(vcpu);
2713
ad312c7c
ZX		 2714 regs->rax = vcpu->arch.regs[VCPU_REGS_RAX];
2715 regs->rbx = vcpu->arch.regs[VCPU_REGS_RBX];
2716 regs->rcx = vcpu->arch.regs[VCPU_REGS_RCX];
2717 regs->rdx = vcpu->arch.regs[VCPU_REGS_RDX];
2718 regs->rsi = vcpu->arch.regs[VCPU_REGS_RSI];
2719 regs->rdi = vcpu->arch.regs[VCPU_REGS_RDI];
2720 regs->rsp = vcpu->arch.regs[VCPU_REGS_RSP];
2721 regs->rbp = vcpu->arch.regs[VCPU_REGS_RBP];
b6c7a5dc 2722#ifdef CONFIG_X86_64
ad312c7c
ZX		 2723 regs->r8 = vcpu->arch.regs[VCPU_REGS_R8];
2724 regs->r9 = vcpu->arch.regs[VCPU_REGS_R9];
2725 regs->r10 = vcpu->arch.regs[VCPU_REGS_R10];
2726 regs->r11 = vcpu->arch.regs[VCPU_REGS_R11];
2727 regs->r12 = vcpu->arch.regs[VCPU_REGS_R12];
2728 regs->r13 = vcpu->arch.regs[VCPU_REGS_R13];
2729 regs->r14 = vcpu->arch.regs[VCPU_REGS_R14];
2730 regs->r15 = vcpu->arch.regs[VCPU_REGS_R15];
b6c7a5dc
HB		 2731#endif
2732
ad312c7c 2733 regs->rip = vcpu->arch.rip;
b6c7a5dc
HB		 2734 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2735
2736 /*
2737 * Don't leak debug flags in case they were set for guest debugging
2738 */
2739 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2740 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2741
2742 vcpu_put(vcpu);
2743
2744 return 0;
2745}
2746
2747int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2748{
2749 vcpu_load(vcpu);
2750
ad312c7c
ZX		 2751 vcpu->arch.regs[VCPU_REGS_RAX] = regs->rax;
2752 vcpu->arch.regs[VCPU_REGS_RBX] = regs->rbx;
2753 vcpu->arch.regs[VCPU_REGS_RCX] = regs->rcx;
2754 vcpu->arch.regs[VCPU_REGS_RDX] = regs->rdx;
2755 vcpu->arch.regs[VCPU_REGS_RSI] = regs->rsi;
2756 vcpu->arch.regs[VCPU_REGS_RDI] = regs->rdi;
2757 vcpu->arch.regs[VCPU_REGS_RSP] = regs->rsp;
2758 vcpu->arch.regs[VCPU_REGS_RBP] = regs->rbp;
b6c7a5dc 2759#ifdef CONFIG_X86_64
ad312c7c
ZX		 2760 vcpu->arch.regs[VCPU_REGS_R8] = regs->r8;
2761 vcpu->arch.regs[VCPU_REGS_R9] = regs->r9;
2762 vcpu->arch.regs[VCPU_REGS_R10] = regs->r10;
2763 vcpu->arch.regs[VCPU_REGS_R11] = regs->r11;
2764 vcpu->arch.regs[VCPU_REGS_R12] = regs->r12;
2765 vcpu->arch.regs[VCPU_REGS_R13] = regs->r13;
2766 vcpu->arch.regs[VCPU_REGS_R14] = regs->r14;
2767 vcpu->arch.regs[VCPU_REGS_R15] = regs->r15;
b6c7a5dc
HB		 2768#endif
2769
ad312c7c 2770 vcpu->arch.rip = regs->rip;
b6c7a5dc
HB		 2771 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
2772
2773 kvm_x86_ops->decache_regs(vcpu);
2774
2775 vcpu_put(vcpu);
2776
2777 return 0;
2778}
2779
2780static void get_segment(struct kvm_vcpu *vcpu,
2781 struct kvm_segment *var, int seg)
2782{
2783 return kvm_x86_ops->get_segment(vcpu, var, seg);
2784}
2785
2786void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2787{
2788 struct kvm_segment cs;
2789
2790 get_segment(vcpu, &cs, VCPU_SREG_CS);
2791 *db = cs.db;
2792 *l = cs.l;
2793}
2794EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
2795
2796int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2797 struct kvm_sregs *sregs)
2798{
2799 struct descriptor_table dt;
2800 int pending_vec;
2801
2802 vcpu_load(vcpu);
2803
2804 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2805 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2806 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2807 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2808 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2809 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2810
2811 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2812 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2813
2814 kvm_x86_ops->get_idt(vcpu, &dt);
2815 sregs->idt.limit = dt.limit;
2816 sregs->idt.base = dt.base;
2817 kvm_x86_ops->get_gdt(vcpu, &dt);
2818 sregs->gdt.limit = dt.limit;
2819 sregs->gdt.base = dt.base;
2820
2821 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
ad312c7c
ZX		 2822 sregs->cr0 = vcpu->arch.cr0;
2823 sregs->cr2 = vcpu->arch.cr2;
2824 sregs->cr3 = vcpu->arch.cr3;
2825 sregs->cr4 = vcpu->arch.cr4;
b6c7a5dc 2826 sregs->cr8 = get_cr8(vcpu);
ad312c7c 2827 sregs->efer = vcpu->arch.shadow_efer;
b6c7a5dc
HB		 2828 sregs->apic_base = kvm_get_apic_base(vcpu);
2829
2830 if (irqchip_in_kernel(vcpu->kvm)) {
2831 memset(sregs->interrupt_bitmap, 0,
2832 sizeof sregs->interrupt_bitmap);
2833 pending_vec = kvm_x86_ops->get_irq(vcpu);
2834 if (pending_vec >= 0)
2835 set_bit(pending_vec,
2836 (unsigned long *)sregs->interrupt_bitmap);
2837 } else
ad312c7c 2838 memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending,
b6c7a5dc
HB		 2839 sizeof sregs->interrupt_bitmap);
2840
2841 vcpu_put(vcpu);
2842
2843 return 0;
2844}
2845
2846static void set_segment(struct kvm_vcpu *vcpu,
2847 struct kvm_segment *var, int seg)
2848{
2849 return kvm_x86_ops->set_segment(vcpu, var, seg);
2850}
2851
2852int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2853 struct kvm_sregs *sregs)
2854{
2855 int mmu_reset_needed = 0;
2856 int i, pending_vec, max_bits;
2857 struct descriptor_table dt;
2858
2859 vcpu_load(vcpu);
2860
2861 dt.limit = sregs->idt.limit;
2862 dt.base = sregs->idt.base;
2863 kvm_x86_ops->set_idt(vcpu, &dt);
2864 dt.limit = sregs->gdt.limit;
2865 dt.base = sregs->gdt.base;
2866 kvm_x86_ops->set_gdt(vcpu, &dt);
2867
ad312c7c
ZX		 2868 vcpu->arch.cr2 = sregs->cr2;
2869 mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
2870 vcpu->arch.cr3 = sregs->cr3;
b6c7a5dc
HB		 2871
2872 set_cr8(vcpu, sregs->cr8);
2873
ad312c7c 2874 mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
b6c7a5dc 2875 kvm_x86_ops->set_efer(vcpu, sregs->efer);
b6c7a5dc
HB		 2876 kvm_set_apic_base(vcpu, sregs->apic_base);
2877
2878 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2879
ad312c7c 2880 mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
b6c7a5dc 2881 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
d7306163 2882 vcpu->arch.cr0 = sregs->cr0;
b6c7a5dc 2883
ad312c7c 2884 mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
b6c7a5dc
HB		 2885 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
2886 if (!is_long_mode(vcpu) && is_pae(vcpu))
ad312c7c 2887 load_pdptrs(vcpu, vcpu->arch.cr3);
b6c7a5dc
HB		 2888
2889 if (mmu_reset_needed)
2890 kvm_mmu_reset_context(vcpu);
2891
2892 if (!irqchip_in_kernel(vcpu->kvm)) {
ad312c7c
ZX		 2893 memcpy(vcpu->arch.irq_pending, sregs->interrupt_bitmap,
2894 sizeof vcpu->arch.irq_pending);
2895 vcpu->arch.irq_summary = 0;
2896 for (i = 0; i < ARRAY_SIZE(vcpu->arch.irq_pending); ++i)
2897 if (vcpu->arch.irq_pending[i])
2898 __set_bit(i, &vcpu->arch.irq_summary);
b6c7a5dc
HB		 2899 } else {
2900 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2901 pending_vec = find_first_bit(
2902 (const unsigned long *)sregs->interrupt_bitmap,
2903 max_bits);
2904 /* Only pending external irq is handled here */
2905 if (pending_vec < max_bits) {
2906 kvm_x86_ops->set_irq(vcpu, pending_vec);
2907 pr_debug("Set back pending irq %d\n",
2908 pending_vec);
2909 }
2910 }
2911
2912 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2913 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2914 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2915 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2916 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2917 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2918
2919 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2920 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2921
2922 vcpu_put(vcpu);
2923
2924 return 0;
2925}
2926
2927int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2928 struct kvm_debug_guest *dbg)
2929{
2930 int r;
2931
2932 vcpu_load(vcpu);
2933
2934 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
2935
2936 vcpu_put(vcpu);
2937
2938 return r;
2939}
2940
d0752060
HB		 2941/*
2942 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2943 * we have asm/x86/processor.h
2944 */
2945struct fxsave {
2946 u16 cwd;
2947 u16 swd;
2948 u16 twd;
2949 u16 fop;
2950 u64 rip;
2951 u64 rdp;
2952 u32 mxcsr;
2953 u32 mxcsr_mask;
2954 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2955#ifdef CONFIG_X86_64
2956 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2957#else
2958 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2959#endif
2960};
2961
8b006791
ZX		 2962/*
2963 * Translate a guest virtual address to a guest physical address.
2964 */
2965int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2966 struct kvm_translation *tr)
2967{
2968 unsigned long vaddr = tr->linear_address;
2969 gpa_t gpa;
2970
2971 vcpu_load(vcpu);
72dc67a6 2972 down_read(&vcpu->kvm->slots_lock);
ad312c7c 2973 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
72dc67a6 2974 up_read(&vcpu->kvm->slots_lock);
8b006791
ZX		 2975 tr->physical_address = gpa;
2976 tr->valid = gpa != UNMAPPED_GVA;
2977 tr->writeable = 1;
2978 tr->usermode = 0;
8b006791
ZX		 2979 vcpu_put(vcpu);
2980
2981 return 0;
2982}
2983
d0752060
HB		 2984int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2985{
ad312c7c 2986 struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
d0752060
HB		 2987
2988 vcpu_load(vcpu);
2989
2990 memcpy(fpu->fpr, fxsave->st_space, 128);
2991 fpu->fcw = fxsave->cwd;
2992 fpu->fsw = fxsave->swd;
2993 fpu->ftwx = fxsave->twd;
2994 fpu->last_opcode = fxsave->fop;
2995 fpu->last_ip = fxsave->rip;
2996 fpu->last_dp = fxsave->rdp;
2997 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2998
2999 vcpu_put(vcpu);
3000
3001 return 0;
3002}
3003
3004int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3005{
ad312c7c 3006 struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
d0752060
HB		 3007
3008 vcpu_load(vcpu);
3009
3010 memcpy(fxsave->st_space, fpu->fpr, 128);
3011 fxsave->cwd = fpu->fcw;
3012 fxsave->swd = fpu->fsw;
3013 fxsave->twd = fpu->ftwx;
3014 fxsave->fop = fpu->last_opcode;
3015 fxsave->rip = fpu->last_ip;
3016 fxsave->rdp = fpu->last_dp;
3017 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
3018
3019 vcpu_put(vcpu);
3020
3021 return 0;
3022}
3023
3024void fx_init(struct kvm_vcpu *vcpu)
3025{
3026 unsigned after_mxcsr_mask;
3027
3028 /* Initialize guest FPU by resetting ours and saving into guest's */
3029 preempt_disable();
ad312c7c 3030 fx_save(&vcpu->arch.host_fx_image);
d0752060 3031 fpu_init();
ad312c7c
ZX		 3032 fx_save(&vcpu->arch.guest_fx_image);
3033 fx_restore(&vcpu->arch.host_fx_image);
d0752060
HB		 3034 preempt_enable();
3035
ad312c7c 3036 vcpu->arch.cr0 |= X86_CR0_ET;
d0752060 3037 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
ad312c7c
ZX		 3038 vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
3039 memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
d0752060
HB		 3040 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
3041}
3042EXPORT_SYMBOL_GPL(fx_init);
3043
3044void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
3045{
3046 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
3047 return;
3048
3049 vcpu->guest_fpu_loaded = 1;
ad312c7c
ZX		 3050 fx_save(&vcpu->arch.host_fx_image);
3051 fx_restore(&vcpu->arch.guest_fx_image);
d0752060
HB		 3052}
3053EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
3054
3055void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
3056{
3057 if (!vcpu->guest_fpu_loaded)
3058 return;
3059
3060 vcpu->guest_fpu_loaded = 0;
ad312c7c
ZX		 3061 fx_save(&vcpu->arch.guest_fx_image);
3062 fx_restore(&vcpu->arch.host_fx_image);
f096ed85 3063 ++vcpu->stat.fpu_reload;
d0752060
HB		 3064}
3065EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
e9b11c17
ZX		 3066
3067void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
3068{
3069 kvm_x86_ops->vcpu_free(vcpu);
3070}
3071
3072struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
3073 unsigned int id)
3074{
26e5215f
AK		 3075 return kvm_x86_ops->vcpu_create(kvm, id);
3076}
e9b11c17 3077
26e5215f
AK		 3078int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
3079{
3080 int r;
e9b11c17
ZX		 3081
3082 /* We do fxsave: this must be aligned. */
ad312c7c 3083 BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
e9b11c17
ZX		 3084
3085 vcpu_load(vcpu);
3086 r = kvm_arch_vcpu_reset(vcpu);
3087 if (r == 0)
3088 r = kvm_mmu_setup(vcpu);
3089 vcpu_put(vcpu);
3090 if (r < 0)
3091 goto free_vcpu;
3092
26e5215f 3093 return 0;
e9b11c17
ZX		 3094free_vcpu:
3095 kvm_x86_ops->vcpu_free(vcpu);
26e5215f 3096 return r;
e9b11c17
ZX		 3097}
3098
d40ccc62 3099void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
e9b11c17
ZX		 3100{
3101 vcpu_load(vcpu);
3102 kvm_mmu_unload(vcpu);
3103 vcpu_put(vcpu);
3104
3105 kvm_x86_ops->vcpu_free(vcpu);
3106}
3107
3108int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
3109{
3110 return kvm_x86_ops->vcpu_reset(vcpu);
3111}
3112
3113void kvm_arch_hardware_enable(void *garbage)
3114{
3115 kvm_x86_ops->hardware_enable(garbage);
3116}
3117
3118void kvm_arch_hardware_disable(void *garbage)
3119{
3120 kvm_x86_ops->hardware_disable(garbage);
3121}
3122
3123int kvm_arch_hardware_setup(void)
3124{
3125 return kvm_x86_ops->hardware_setup();
3126}
3127
3128void kvm_arch_hardware_unsetup(void)
3129{
3130 kvm_x86_ops->hardware_unsetup();
3131}
3132
3133void kvm_arch_check_processor_compat(void *rtn)
3134{
3135 kvm_x86_ops->check_processor_compatibility(rtn);
3136}
3137
3138int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
3139{
3140 struct page *page;
3141 struct kvm *kvm;
3142 int r;
3143
3144 BUG_ON(vcpu->kvm == NULL);
3145 kvm = vcpu->kvm;
3146
ad312c7c 3147 vcpu->arch.mmu.root_hpa = INVALID_PAGE;
e9b11c17 3148 if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
ad312c7c 3149 vcpu->arch.mp_state = VCPU_MP_STATE_RUNNABLE;
e9b11c17 3150 else
ad312c7c 3151 vcpu->arch.mp_state = VCPU_MP_STATE_UNINITIALIZED;
e9b11c17
ZX		 3152
3153 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3154 if (!page) {
3155 r = -ENOMEM;
3156 goto fail;
3157 }
ad312c7c 3158 vcpu->arch.pio_data = page_address(page);
e9b11c17
ZX		 3159
3160 r = kvm_mmu_create(vcpu);
3161 if (r < 0)
3162 goto fail_free_pio_data;
3163
3164 if (irqchip_in_kernel(kvm)) {
3165 r = kvm_create_lapic(vcpu);
3166 if (r < 0)
3167 goto fail_mmu_destroy;
3168 }
3169
3170 return 0;
3171
3172fail_mmu_destroy:
3173 kvm_mmu_destroy(vcpu);
3174fail_free_pio_data:
ad312c7c 3175 free_page((unsigned long)vcpu->arch.pio_data);
e9b11c17
ZX		 3176fail:
3177 return r;
3178}
3179
3180void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
3181{
3182 kvm_free_lapic(vcpu);
3183 kvm_mmu_destroy(vcpu);
ad312c7c 3184 free_page((unsigned long)vcpu->arch.pio_data);
e9b11c17 3185}
d19a9cd2
ZX		 3186
3187struct kvm *kvm_arch_create_vm(void)
3188{
3189 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
3190
3191 if (!kvm)
3192 return ERR_PTR(-ENOMEM);
3193
f05e70ac 3194 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
d19a9cd2
ZX		 3195
3196 return kvm;
3197}
3198
3199static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
3200{
3201 vcpu_load(vcpu);
3202 kvm_mmu_unload(vcpu);
3203 vcpu_put(vcpu);
3204}
3205
3206static void kvm_free_vcpus(struct kvm *kvm)
3207{
3208 unsigned int i;
3209
3210 /*
3211 * Unpin any mmu pages first.
3212 */
3213 for (i = 0; i < KVM_MAX_VCPUS; ++i)
3214 if (kvm->vcpus[i])
3215 kvm_unload_vcpu_mmu(kvm->vcpus[i]);
3216 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3217 if (kvm->vcpus[i]) {
3218 kvm_arch_vcpu_free(kvm->vcpus[i]);
3219 kvm->vcpus[i] = NULL;
3220 }
3221 }
3222
3223}
3224
3225void kvm_arch_destroy_vm(struct kvm *kvm)
3226{
d7deeeb0
ZX		 3227 kfree(kvm->arch.vpic);
3228 kfree(kvm->arch.vioapic);
d19a9cd2
ZX		 3229 kvm_free_vcpus(kvm);
3230 kvm_free_physmem(kvm);
3231 kfree(kvm);
3232}
0de10343
ZX		 3233
3234int kvm_arch_set_memory_region(struct kvm *kvm,
3235 struct kvm_userspace_memory_region *mem,
3236 struct kvm_memory_slot old,
3237 int user_alloc)
3238{
3239 int npages = mem->memory_size >> PAGE_SHIFT;
3240 struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
3241
3242 /*To keep backward compatibility with older userspace,
3243 *x86 needs to hanlde !user_alloc case.
3244 */
3245 if (!user_alloc) {
3246 if (npages && !old.rmap) {
72dc67a6 3247 down_write(&current->mm->mmap_sem);
0de10343
ZX		 3248 memslot->userspace_addr = do_mmap(NULL, 0,
3249 npages * PAGE_SIZE,
3250 PROT_READ | PROT_WRITE,
3251 MAP_SHARED | MAP_ANONYMOUS,
3252 0);
72dc67a6 3253 up_write(&current->mm->mmap_sem);
0de10343
ZX		 3254
3255 if (IS_ERR((void *)memslot->userspace_addr))
3256 return PTR_ERR((void *)memslot->userspace_addr);
3257 } else {
3258 if (!old.user_alloc && old.rmap) {
3259 int ret;
3260
72dc67a6 3261 down_write(&current->mm->mmap_sem);
0de10343
ZX		 3262 ret = do_munmap(current->mm, old.userspace_addr,
3263 old.npages * PAGE_SIZE);
72dc67a6 3264 up_write(&current->mm->mmap_sem);
0de10343
ZX		 3265 if (ret < 0)
3266 printk(KERN_WARNING
3267 "kvm_vm_ioctl_set_memory_region: "
3268 "failed to munmap memory\n");
3269 }
3270 }
3271 }
3272
f05e70ac 3273 if (!kvm->arch.n_requested_mmu_pages) {
0de10343
ZX		 3274 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
3275 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
3276 }
3277
3278 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
3279 kvm_flush_remote_tlbs(kvm);
3280
3281 return 0;
3282}
1d737c8a
ZX		 3283
3284int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
3285{
3286 return vcpu->arch.mp_state == VCPU_MP_STATE_RUNNABLE
3287 || vcpu->arch.mp_state == VCPU_MP_STATE_SIPI_RECEIVED;
3288}
5736199a
ZX		 3289
3290static void vcpu_kick_intr(void *info)
3291{
3292#ifdef DEBUG
3293 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
3294 printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
3295#endif
3296}
3297
3298void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
3299{
3300 int ipi_pcpu = vcpu->cpu;
3301
3302 if (waitqueue_active(&vcpu->wq)) {
3303 wake_up_interruptible(&vcpu->wq);
3304 ++vcpu->stat.halt_wakeup;
3305 }
3306 if (vcpu->guest_mode)
3307 smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
3308}
Linux kernel - Deliverables
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