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Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
[linux/fpc-iii.git] / arch / x86 / kvm / x86.c
blobbe451ee44249be80cdc4829df1f8a6ccc1f5d2f5
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 * Copyright (C) 2008 Qumranet, Inc.
8 * Copyright IBM Corporation, 2008
9 *
10 * Authors:
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
13 * Amit Shah <amit.shah@qumranet.com>
14 * Ben-Ami Yassour <benami@il.ibm.com>
15 *
16 * This work is licensed under the terms of the GNU GPL, version 2. See
17 * the COPYING file in the top-level directory.
18 *
19 */
20
21 #include <linux/kvm_host.h>
22 #include "irq.h"
23 #include "mmu.h"
24 #include "i8254.h"
25 #include "tss.h"
26 #include "kvm_cache_regs.h"
27 #include "x86.h"
28
29 #include <linux/clocksource.h>
30 #include <linux/interrupt.h>
31 #include <linux/kvm.h>
32 #include <linux/fs.h>
33 #include <linux/vmalloc.h>
34 #include <linux/module.h>
35 #include <linux/mman.h>
36 #include <linux/highmem.h>
37 #include <linux/iommu.h>
38 #include <linux/intel-iommu.h>
39 #include <linux/cpufreq.h>
40 #include <trace/events/kvm.h>
41 #undef TRACE_INCLUDE_FILE
42 #define CREATE_TRACE_POINTS
43 #include "trace.h"
44
45 #include <asm/uaccess.h>
46 #include <asm/msr.h>
47 #include <asm/desc.h>
48 #include <asm/mtrr.h>
49 #include <asm/mce.h>
50
51 #define MAX_IO_MSRS 256
52 #define CR0_RESERVED_BITS \
53 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
54 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
55 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
56 #define CR4_RESERVED_BITS \
57 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
58 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
59 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
60 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
61
62 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
63
64 #define KVM_MAX_MCE_BANKS 32
65 #define KVM_MCE_CAP_SUPPORTED MCG_CTL_P
66
67 /* EFER defaults:
68 * - enable syscall per default because its emulated by KVM
69 * - enable LME and LMA per default on 64 bit KVM
70 */
71 #ifdef CONFIG_X86_64
72 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
73 #else
74 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
75 #endif
76
77 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
78 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
79
80 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
81 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
82 struct kvm_cpuid_entry2 __user *entries);
83
84 struct kvm_x86_ops *kvm_x86_ops;
85 EXPORT_SYMBOL_GPL(kvm_x86_ops);
86
87 int ignore_msrs = 0;
88 module_param_named(ignore_msrs, ignore_msrs, bool, S_IRUGO | S_IWUSR);
89
90 struct kvm_stats_debugfs_item debugfs_entries[] = {
91 { "pf_fixed", VCPU_STAT(pf_fixed) },
92 { "pf_guest", VCPU_STAT(pf_guest) },
93 { "tlb_flush", VCPU_STAT(tlb_flush) },
94 { "invlpg", VCPU_STAT(invlpg) },
95 { "exits", VCPU_STAT(exits) },
96 { "io_exits", VCPU_STAT(io_exits) },
97 { "mmio_exits", VCPU_STAT(mmio_exits) },
98 { "signal_exits", VCPU_STAT(signal_exits) },
99 { "irq_window", VCPU_STAT(irq_window_exits) },
100 { "nmi_window", VCPU_STAT(nmi_window_exits) },
101 { "halt_exits", VCPU_STAT(halt_exits) },
102 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
103 { "hypercalls", VCPU_STAT(hypercalls) },
104 { "request_irq", VCPU_STAT(request_irq_exits) },
105 { "irq_exits", VCPU_STAT(irq_exits) },
106 { "host_state_reload", VCPU_STAT(host_state_reload) },
107 { "efer_reload", VCPU_STAT(efer_reload) },
108 { "fpu_reload", VCPU_STAT(fpu_reload) },
109 { "insn_emulation", VCPU_STAT(insn_emulation) },
110 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
111 { "irq_injections", VCPU_STAT(irq_injections) },
112 { "nmi_injections", VCPU_STAT(nmi_injections) },
113 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
114 { "mmu_pte_write", VM_STAT(mmu_pte_write) },
115 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
116 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
117 { "mmu_flooded", VM_STAT(mmu_flooded) },
118 { "mmu_recycled", VM_STAT(mmu_recycled) },
119 { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
120 { "mmu_unsync", VM_STAT(mmu_unsync) },
121 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
122 { "largepages", VM_STAT(lpages) },
123 { NULL }
124 };
125
126 unsigned long segment_base(u16 selector)
127 {
128 struct descriptor_table gdt;
129 struct desc_struct *d;
130 unsigned long table_base;
131 unsigned long v;
132
133 if (selector == 0)
134 return 0;
135
136 kvm_get_gdt(&gdt);
137 table_base = gdt.base;
138
139 if (selector & 4) { /* from ldt */
140 u16 ldt_selector = kvm_read_ldt();
141
142 table_base = segment_base(ldt_selector);
143 }
144 d = (struct desc_struct *)(table_base + (selector & ~7));
145 v = get_desc_base(d);
146 #ifdef CONFIG_X86_64
147 if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
148 v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
149 #endif
150 return v;
151 }
152 EXPORT_SYMBOL_GPL(segment_base);
153
154 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
155 {
156 if (irqchip_in_kernel(vcpu->kvm))
157 return vcpu->arch.apic_base;
158 else
159 return vcpu->arch.apic_base;
160 }
161 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
162
163 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
164 {
165 /* TODO: reserve bits check */
166 if (irqchip_in_kernel(vcpu->kvm))
167 kvm_lapic_set_base(vcpu, data);
168 else
169 vcpu->arch.apic_base = data;
170 }
171 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
172
173 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
174 {
175 WARN_ON(vcpu->arch.exception.pending);
176 vcpu->arch.exception.pending = true;
177 vcpu->arch.exception.has_error_code = false;
178 vcpu->arch.exception.nr = nr;
179 }
180 EXPORT_SYMBOL_GPL(kvm_queue_exception);
181
182 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
183 u32 error_code)
184 {
185 ++vcpu->stat.pf_guest;
186
187 if (vcpu->arch.exception.pending) {
188 switch(vcpu->arch.exception.nr) {
189 case DF_VECTOR:
190 /* triple fault -> shutdown */
191 set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
192 return;
193 case PF_VECTOR:
194 vcpu->arch.exception.nr = DF_VECTOR;
195 vcpu->arch.exception.error_code = 0;
196 return;
197 default:
198 /* replace previous exception with a new one in a hope
199 that instruction re-execution will regenerate lost
200 exception */
201 vcpu->arch.exception.pending = false;
202 break;
203 }
204 }
205 vcpu->arch.cr2 = addr;
206 kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
207 }
208
209 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
210 {
211 vcpu->arch.nmi_pending = 1;
212 }
213 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
214
215 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
216 {
217 WARN_ON(vcpu->arch.exception.pending);
218 vcpu->arch.exception.pending = true;
219 vcpu->arch.exception.has_error_code = true;
220 vcpu->arch.exception.nr = nr;
221 vcpu->arch.exception.error_code = error_code;
222 }
223 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
224
225 /*
226 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue
227 * a #GP and return false.
228 */
229 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
230 {
231 if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
232 return true;
233 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
234 return false;
235 }
236 EXPORT_SYMBOL_GPL(kvm_require_cpl);
237
238 /*
239 * Load the pae pdptrs. Return true is they are all valid.
240 */
241 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
242 {
243 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
244 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
245 int i;
246 int ret;
247 u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
248
249 ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
250 offset * sizeof(u64), sizeof(pdpte));
251 if (ret < 0) {
252 ret = 0;
253 goto out;
254 }
255 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
256 if (is_present_gpte(pdpte[i]) &&
257 (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
258 ret = 0;
259 goto out;
260 }
261 }
262 ret = 1;
263
264 memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
265 __set_bit(VCPU_EXREG_PDPTR,
266 (unsigned long *)&vcpu->arch.regs_avail);
267 __set_bit(VCPU_EXREG_PDPTR,
268 (unsigned long *)&vcpu->arch.regs_dirty);
269 out:
270
271 return ret;
272 }
273 EXPORT_SYMBOL_GPL(load_pdptrs);
274
275 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
276 {
277 u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
278 bool changed = true;
279 int r;
280
281 if (is_long_mode(vcpu) || !is_pae(vcpu))
282 return false;
283
284 if (!test_bit(VCPU_EXREG_PDPTR,
285 (unsigned long *)&vcpu->arch.regs_avail))
286 return true;
287
288 r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
289 if (r < 0)
290 goto out;
291 changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
292 out:
293
294 return changed;
295 }
296
297 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
298 {
299 if (cr0 & CR0_RESERVED_BITS) {
300 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
301 cr0, vcpu->arch.cr0);
302 kvm_inject_gp(vcpu, 0);
303 return;
304 }
305
306 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
307 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
308 kvm_inject_gp(vcpu, 0);
309 return;
310 }
311
312 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
313 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
314 "and a clear PE flag\n");
315 kvm_inject_gp(vcpu, 0);
316 return;
317 }
318
319 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
320 #ifdef CONFIG_X86_64
321 if ((vcpu->arch.shadow_efer & EFER_LME)) {
322 int cs_db, cs_l;
323
324 if (!is_pae(vcpu)) {
325 printk(KERN_DEBUG "set_cr0: #GP, start paging "
326 "in long mode while PAE is disabled\n");
327 kvm_inject_gp(vcpu, 0);
328 return;
329 }
330 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
331 if (cs_l) {
332 printk(KERN_DEBUG "set_cr0: #GP, start paging "
333 "in long mode while CS.L == 1\n");
334 kvm_inject_gp(vcpu, 0);
335 return;
336
337 }
338 } else
339 #endif
340 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
341 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
342 "reserved bits\n");
343 kvm_inject_gp(vcpu, 0);
344 return;
345 }
346
347 }
348
349 kvm_x86_ops->set_cr0(vcpu, cr0);
350 vcpu->arch.cr0 = cr0;
351
352 kvm_mmu_reset_context(vcpu);
353 return;
354 }
355 EXPORT_SYMBOL_GPL(kvm_set_cr0);
356
357 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
358 {
359 kvm_set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
360 }
361 EXPORT_SYMBOL_GPL(kvm_lmsw);
362
363 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
364 {
365 unsigned long old_cr4 = vcpu->arch.cr4;
366 unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE;
367
368 if (cr4 & CR4_RESERVED_BITS) {
369 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
370 kvm_inject_gp(vcpu, 0);
371 return;
372 }
373
374 if (is_long_mode(vcpu)) {
375 if (!(cr4 & X86_CR4_PAE)) {
376 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
377 "in long mode\n");
378 kvm_inject_gp(vcpu, 0);
379 return;
380 }
381 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
382 && ((cr4 ^ old_cr4) & pdptr_bits)
383 && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
384 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
385 kvm_inject_gp(vcpu, 0);
386 return;
387 }
388
389 if (cr4 & X86_CR4_VMXE) {
390 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
391 kvm_inject_gp(vcpu, 0);
392 return;
393 }
394 kvm_x86_ops->set_cr4(vcpu, cr4);
395 vcpu->arch.cr4 = cr4;
396 vcpu->arch.mmu.base_role.cr4_pge = (cr4 & X86_CR4_PGE) && !tdp_enabled;
397 kvm_mmu_reset_context(vcpu);
398 }
399 EXPORT_SYMBOL_GPL(kvm_set_cr4);
400
401 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
402 {
403 if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
404 kvm_mmu_sync_roots(vcpu);
405 kvm_mmu_flush_tlb(vcpu);
406 return;
407 }
408
409 if (is_long_mode(vcpu)) {
410 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
411 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
412 kvm_inject_gp(vcpu, 0);
413 return;
414 }
415 } else {
416 if (is_pae(vcpu)) {
417 if (cr3 & CR3_PAE_RESERVED_BITS) {
418 printk(KERN_DEBUG
419 "set_cr3: #GP, reserved bits\n");
420 kvm_inject_gp(vcpu, 0);
421 return;
422 }
423 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
424 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
425 "reserved bits\n");
426 kvm_inject_gp(vcpu, 0);
427 return;
428 }
429 }
430 /*
431 * We don't check reserved bits in nonpae mode, because
432 * this isn't enforced, and VMware depends on this.
433 */
434 }
435
436 /*
437 * Does the new cr3 value map to physical memory? (Note, we
438 * catch an invalid cr3 even in real-mode, because it would
439 * cause trouble later on when we turn on paging anyway.)
440 *
441 * A real CPU would silently accept an invalid cr3 and would
442 * attempt to use it - with largely undefined (and often hard
443 * to debug) behavior on the guest side.
444 */
445 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
446 kvm_inject_gp(vcpu, 0);
447 else {
448 vcpu->arch.cr3 = cr3;
449 vcpu->arch.mmu.new_cr3(vcpu);
450 }
451 }
452 EXPORT_SYMBOL_GPL(kvm_set_cr3);
453
454 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
455 {
456 if (cr8 & CR8_RESERVED_BITS) {
457 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
458 kvm_inject_gp(vcpu, 0);
459 return;
460 }
461 if (irqchip_in_kernel(vcpu->kvm))
462 kvm_lapic_set_tpr(vcpu, cr8);
463 else
464 vcpu->arch.cr8 = cr8;
465 }
466 EXPORT_SYMBOL_GPL(kvm_set_cr8);
467
468 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
469 {
470 if (irqchip_in_kernel(vcpu->kvm))
471 return kvm_lapic_get_cr8(vcpu);
472 else
473 return vcpu->arch.cr8;
474 }
475 EXPORT_SYMBOL_GPL(kvm_get_cr8);
476
477 static inline u32 bit(int bitno)
478 {
479 return 1 << (bitno & 31);
480 }
481
482 /*
483 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
484 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
485 *
486 * This list is modified at module load time to reflect the
487 * capabilities of the host cpu.
488 */
489 static u32 msrs_to_save[] = {
490 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
491 MSR_K6_STAR,
492 #ifdef CONFIG_X86_64
493 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
494 #endif
495 MSR_IA32_TSC, MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
496 MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
497 };
498
499 static unsigned num_msrs_to_save;
500
501 static u32 emulated_msrs[] = {
502 MSR_IA32_MISC_ENABLE,
503 };
504
505 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
506 {
507 if (efer & efer_reserved_bits) {
508 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
509 efer);
510 kvm_inject_gp(vcpu, 0);
511 return;
512 }
513
514 if (is_paging(vcpu)
515 && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) {
516 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
517 kvm_inject_gp(vcpu, 0);
518 return;
519 }
520
521 if (efer & EFER_FFXSR) {
522 struct kvm_cpuid_entry2 *feat;
523
524 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
525 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT))) {
526 printk(KERN_DEBUG "set_efer: #GP, enable FFXSR w/o CPUID capability\n");
527 kvm_inject_gp(vcpu, 0);
528 return;
529 }
530 }
531
532 if (efer & EFER_SVME) {
533 struct kvm_cpuid_entry2 *feat;
534
535 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
536 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM))) {
537 printk(KERN_DEBUG "set_efer: #GP, enable SVM w/o SVM\n");
538 kvm_inject_gp(vcpu, 0);
539 return;
540 }
541 }
542
543 kvm_x86_ops->set_efer(vcpu, efer);
544
545 efer &= ~EFER_LMA;
546 efer |= vcpu->arch.shadow_efer & EFER_LMA;
547
548 vcpu->arch.shadow_efer = efer;
549
550 vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
551 kvm_mmu_reset_context(vcpu);
552 }
553
554 void kvm_enable_efer_bits(u64 mask)
555 {
556 efer_reserved_bits &= ~mask;
557 }
558 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
559
560
561 /*
562 * Writes msr value into into the appropriate "register".
563 * Returns 0 on success, non-0 otherwise.
564 * Assumes vcpu_load() was already called.
565 */
566 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
567 {
568 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
569 }
570
571 /*
572 * Adapt set_msr() to msr_io()'s calling convention
573 */
574 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
575 {
576 return kvm_set_msr(vcpu, index, *data);
577 }
578
579 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
580 {
581 static int version;
582 struct pvclock_wall_clock wc;
583 struct timespec now, sys, boot;
584
585 if (!wall_clock)
586 return;
587
588 version++;
589
590 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
591
592 /*
593 * The guest calculates current wall clock time by adding
594 * system time (updated by kvm_write_guest_time below) to the
595 * wall clock specified here. guest system time equals host
596 * system time for us, thus we must fill in host boot time here.
597 */
598 now = current_kernel_time();
599 ktime_get_ts(&sys);
600 boot = ns_to_timespec(timespec_to_ns(&now) - timespec_to_ns(&sys));
601
602 wc.sec = boot.tv_sec;
603 wc.nsec = boot.tv_nsec;
604 wc.version = version;
605
606 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
607
608 version++;
609 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
610 }
611
612 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
613 {
614 uint32_t quotient, remainder;
615
616 /* Don't try to replace with do_div(), this one calculates
617 * "(dividend << 32) / divisor" */
618 __asm__ ( "divl %4"
619 : "=a" (quotient), "=d" (remainder)
620 : "0" (0), "1" (dividend), "r" (divisor) );
621 return quotient;
622 }
623
624 static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock)
625 {
626 uint64_t nsecs = 1000000000LL;
627 int32_t shift = 0;
628 uint64_t tps64;
629 uint32_t tps32;
630
631 tps64 = tsc_khz * 1000LL;
632 while (tps64 > nsecs*2) {
633 tps64 >>= 1;
634 shift--;
635 }
636
637 tps32 = (uint32_t)tps64;
638 while (tps32 <= (uint32_t)nsecs) {
639 tps32 <<= 1;
640 shift++;
641 }
642
643 hv_clock->tsc_shift = shift;
644 hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32);
645
646 pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n",
647 __func__, tsc_khz, hv_clock->tsc_shift,
648 hv_clock->tsc_to_system_mul);
649 }
650
651 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
652
653 static void kvm_write_guest_time(struct kvm_vcpu *v)
654 {
655 struct timespec ts;
656 unsigned long flags;
657 struct kvm_vcpu_arch *vcpu = &v->arch;
658 void *shared_kaddr;
659 unsigned long this_tsc_khz;
660
661 if ((!vcpu->time_page))
662 return;
663
664 this_tsc_khz = get_cpu_var(cpu_tsc_khz);
665 if (unlikely(vcpu->hv_clock_tsc_khz != this_tsc_khz)) {
666 kvm_set_time_scale(this_tsc_khz, &vcpu->hv_clock);
667 vcpu->hv_clock_tsc_khz = this_tsc_khz;
668 }
669 put_cpu_var(cpu_tsc_khz);
670
671 /* Keep irq disabled to prevent changes to the clock */
672 local_irq_save(flags);
673 kvm_get_msr(v, MSR_IA32_TSC, &vcpu->hv_clock.tsc_timestamp);
674 ktime_get_ts(&ts);
675 local_irq_restore(flags);
676
677 /* With all the info we got, fill in the values */
678
679 vcpu->hv_clock.system_time = ts.tv_nsec +
680 (NSEC_PER_SEC * (u64)ts.tv_sec);
681 /*
682 * The interface expects us to write an even number signaling that the
683 * update is finished. Since the guest won't see the intermediate
684 * state, we just increase by 2 at the end.
685 */
686 vcpu->hv_clock.version += 2;
687
688 shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
689
690 memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
691 sizeof(vcpu->hv_clock));
692
693 kunmap_atomic(shared_kaddr, KM_USER0);
694
695 mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
696 }
697
698 static int kvm_request_guest_time_update(struct kvm_vcpu *v)
699 {
700 struct kvm_vcpu_arch *vcpu = &v->arch;
701
702 if (!vcpu->time_page)
703 return 0;
704 set_bit(KVM_REQ_KVMCLOCK_UPDATE, &v->requests);
705 return 1;
706 }
707
708 static bool msr_mtrr_valid(unsigned msr)
709 {
710 switch (msr) {
711 case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
712 case MSR_MTRRfix64K_00000:
713 case MSR_MTRRfix16K_80000:
714 case MSR_MTRRfix16K_A0000:
715 case MSR_MTRRfix4K_C0000:
716 case MSR_MTRRfix4K_C8000:
717 case MSR_MTRRfix4K_D0000:
718 case MSR_MTRRfix4K_D8000:
719 case MSR_MTRRfix4K_E0000:
720 case MSR_MTRRfix4K_E8000:
721 case MSR_MTRRfix4K_F0000:
722 case MSR_MTRRfix4K_F8000:
723 case MSR_MTRRdefType:
724 case MSR_IA32_CR_PAT:
725 return true;
726 case 0x2f8:
727 return true;
728 }
729 return false;
730 }
731
732 static bool valid_pat_type(unsigned t)
733 {
734 return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
735 }
736
737 static bool valid_mtrr_type(unsigned t)
738 {
739 return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
740 }
741
742 static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
743 {
744 int i;
745
746 if (!msr_mtrr_valid(msr))
747 return false;
748
749 if (msr == MSR_IA32_CR_PAT) {
750 for (i = 0; i < 8; i++)
751 if (!valid_pat_type((data >> (i * 8)) & 0xff))
752 return false;
753 return true;
754 } else if (msr == MSR_MTRRdefType) {
755 if (data & ~0xcff)
756 return false;
757 return valid_mtrr_type(data & 0xff);
758 } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
759 for (i = 0; i < 8 ; i++)
760 if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
761 return false;
762 return true;
763 }
764
765 /* variable MTRRs */
766 return valid_mtrr_type(data & 0xff);
767 }
768
769 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
770 {
771 u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
772
773 if (!mtrr_valid(vcpu, msr, data))
774 return 1;
775
776 if (msr == MSR_MTRRdefType) {
777 vcpu->arch.mtrr_state.def_type = data;
778 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
779 } else if (msr == MSR_MTRRfix64K_00000)
780 p[0] = data;
781 else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
782 p[1 + msr - MSR_MTRRfix16K_80000] = data;
783 else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
784 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
785 else if (msr == MSR_IA32_CR_PAT)
786 vcpu->arch.pat = data;
787 else { /* Variable MTRRs */
788 int idx, is_mtrr_mask;
789 u64 *pt;
790
791 idx = (msr - 0x200) / 2;
792 is_mtrr_mask = msr - 0x200 - 2 * idx;
793 if (!is_mtrr_mask)
794 pt =
795 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
796 else
797 pt =
798 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
799 *pt = data;
800 }
801
802 kvm_mmu_reset_context(vcpu);
803 return 0;
804 }
805
806 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
807 {
808 u64 mcg_cap = vcpu->arch.mcg_cap;
809 unsigned bank_num = mcg_cap & 0xff;
810
811 switch (msr) {
812 case MSR_IA32_MCG_STATUS:
813 vcpu->arch.mcg_status = data;
814 break;
815 case MSR_IA32_MCG_CTL:
816 if (!(mcg_cap & MCG_CTL_P))
817 return 1;
818 if (data != 0 && data != ~(u64)0)
819 return -1;
820 vcpu->arch.mcg_ctl = data;
821 break;
822 default:
823 if (msr >= MSR_IA32_MC0_CTL &&
824 msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
825 u32 offset = msr - MSR_IA32_MC0_CTL;
826 /* only 0 or all 1s can be written to IA32_MCi_CTL */
827 if ((offset & 0x3) == 0 &&
828 data != 0 && data != ~(u64)0)
829 return -1;
830 vcpu->arch.mce_banks[offset] = data;
831 break;
832 }
833 return 1;
834 }
835 return 0;
836 }
837
838 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
839 {
840 switch (msr) {
841 case MSR_EFER:
842 set_efer(vcpu, data);
843 break;
844 case MSR_K7_HWCR:
845 data &= ~(u64)0x40; /* ignore flush filter disable */
846 if (data != 0) {
847 pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
848 data);
849 return 1;
850 }
851 break;
852 case MSR_FAM10H_MMIO_CONF_BASE:
853 if (data != 0) {
854 pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
855 "0x%llx\n", data);
856 return 1;
857 }
858 break;
859 case MSR_AMD64_NB_CFG:
860 break;
861 case MSR_IA32_DEBUGCTLMSR:
862 if (!data) {
863 /* We support the non-activated case already */
864 break;
865 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
866 /* Values other than LBR and BTF are vendor-specific,
867 thus reserved and should throw a #GP */
868 return 1;
869 }
870 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
871 __func__, data);
872 break;
873 case MSR_IA32_UCODE_REV:
874 case MSR_IA32_UCODE_WRITE:
875 case MSR_VM_HSAVE_PA:
876 case MSR_AMD64_PATCH_LOADER:
877 break;
878 case 0x200 ... 0x2ff:
879 return set_msr_mtrr(vcpu, msr, data);
880 case MSR_IA32_APICBASE:
881 kvm_set_apic_base(vcpu, data);
882 break;
883 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
884 return kvm_x2apic_msr_write(vcpu, msr, data);
885 case MSR_IA32_MISC_ENABLE:
886 vcpu->arch.ia32_misc_enable_msr = data;
887 break;
888 case MSR_KVM_WALL_CLOCK:
889 vcpu->kvm->arch.wall_clock = data;
890 kvm_write_wall_clock(vcpu->kvm, data);
891 break;
892 case MSR_KVM_SYSTEM_TIME: {
893 if (vcpu->arch.time_page) {
894 kvm_release_page_dirty(vcpu->arch.time_page);
895 vcpu->arch.time_page = NULL;
896 }
897
898 vcpu->arch.time = data;
899
900 /* we verify if the enable bit is set... */
901 if (!(data & 1))
902 break;
903
904 /* ...but clean it before doing the actual write */
905 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
906
907 vcpu->arch.time_page =
908 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
909
910 if (is_error_page(vcpu->arch.time_page)) {
911 kvm_release_page_clean(vcpu->arch.time_page);
912 vcpu->arch.time_page = NULL;
913 }
914
915 kvm_request_guest_time_update(vcpu);
916 break;
917 }
918 case MSR_IA32_MCG_CTL:
919 case MSR_IA32_MCG_STATUS:
920 case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
921 return set_msr_mce(vcpu, msr, data);
922
923 /* Performance counters are not protected by a CPUID bit,
924 * so we should check all of them in the generic path for the sake of
925 * cross vendor migration.
926 * Writing a zero into the event select MSRs disables them,
927 * which we perfectly emulate ;-). Any other value should be at least
928 * reported, some guests depend on them.
929 */
930 case MSR_P6_EVNTSEL0:
931 case MSR_P6_EVNTSEL1:
932 case MSR_K7_EVNTSEL0:
933 case MSR_K7_EVNTSEL1:
934 case MSR_K7_EVNTSEL2:
935 case MSR_K7_EVNTSEL3:
936 if (data != 0)
937 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
938 "0x%x data 0x%llx\n", msr, data);
939 break;
940 /* at least RHEL 4 unconditionally writes to the perfctr registers,
941 * so we ignore writes to make it happy.
942 */
943 case MSR_P6_PERFCTR0:
944 case MSR_P6_PERFCTR1:
945 case MSR_K7_PERFCTR0:
946 case MSR_K7_PERFCTR1:
947 case MSR_K7_PERFCTR2:
948 case MSR_K7_PERFCTR3:
949 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
950 "0x%x data 0x%llx\n", msr, data);
951 break;
952 default:
953 if (!ignore_msrs) {
954 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
955 msr, data);
956 return 1;
957 } else {
958 pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
959 msr, data);
960 break;
961 }
962 }
963 return 0;
964 }
965 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
966
967
968 /*
969 * Reads an msr value (of 'msr_index') into 'pdata'.
970 * Returns 0 on success, non-0 otherwise.
971 * Assumes vcpu_load() was already called.
972 */
973 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
974 {
975 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
976 }
977
978 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
979 {
980 u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
981
982 if (!msr_mtrr_valid(msr))
983 return 1;
984
985 if (msr == MSR_MTRRdefType)
986 *pdata = vcpu->arch.mtrr_state.def_type +
987 (vcpu->arch.mtrr_state.enabled << 10);
988 else if (msr == MSR_MTRRfix64K_00000)
989 *pdata = p[0];
990 else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
991 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
992 else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
993 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
994 else if (msr == MSR_IA32_CR_PAT)
995 *pdata = vcpu->arch.pat;
996 else { /* Variable MTRRs */
997 int idx, is_mtrr_mask;
998 u64 *pt;
999
1000 idx = (msr - 0x200) / 2;
1001 is_mtrr_mask = msr - 0x200 - 2 * idx;
1002 if (!is_mtrr_mask)
1003 pt =
1004 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1005 else
1006 pt =
1007 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1008 *pdata = *pt;
1009 }
1010
1011 return 0;
1012 }
1013
1014 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1015 {
1016 u64 data;
1017 u64 mcg_cap = vcpu->arch.mcg_cap;
1018 unsigned bank_num = mcg_cap & 0xff;
1019
1020 switch (msr) {
1021 case MSR_IA32_P5_MC_ADDR:
1022 case MSR_IA32_P5_MC_TYPE:
1023 data = 0;
1024 break;
1025 case MSR_IA32_MCG_CAP:
1026 data = vcpu->arch.mcg_cap;
1027 break;
1028 case MSR_IA32_MCG_CTL:
1029 if (!(mcg_cap & MCG_CTL_P))
1030 return 1;
1031 data = vcpu->arch.mcg_ctl;
1032 break;
1033 case MSR_IA32_MCG_STATUS:
1034 data = vcpu->arch.mcg_status;
1035 break;
1036 default:
1037 if (msr >= MSR_IA32_MC0_CTL &&
1038 msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1039 u32 offset = msr - MSR_IA32_MC0_CTL;
1040 data = vcpu->arch.mce_banks[offset];
1041 break;
1042 }
1043 return 1;
1044 }
1045 *pdata = data;
1046 return 0;
1047 }
1048
1049 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1050 {
1051 u64 data;
1052
1053 switch (msr) {
1054 case MSR_IA32_PLATFORM_ID:
1055 case MSR_IA32_UCODE_REV:
1056 case MSR_IA32_EBL_CR_POWERON:
1057 case MSR_IA32_DEBUGCTLMSR:
1058 case MSR_IA32_LASTBRANCHFROMIP:
1059 case MSR_IA32_LASTBRANCHTOIP:
1060 case MSR_IA32_LASTINTFROMIP:
1061 case MSR_IA32_LASTINTTOIP:
1062 case MSR_K8_SYSCFG:
1063 case MSR_K7_HWCR:
1064 case MSR_VM_HSAVE_PA:
1065 case MSR_P6_PERFCTR0:
1066 case MSR_P6_PERFCTR1:
1067 case MSR_P6_EVNTSEL0:
1068 case MSR_P6_EVNTSEL1:
1069 case MSR_K7_EVNTSEL0:
1070 case MSR_K7_PERFCTR0:
1071 case MSR_K8_INT_PENDING_MSG:
1072 case MSR_AMD64_NB_CFG:
1073 case MSR_FAM10H_MMIO_CONF_BASE:
1074 data = 0;
1075 break;
1076 case MSR_MTRRcap:
1077 data = 0x500 | KVM_NR_VAR_MTRR;
1078 break;
1079 case 0x200 ... 0x2ff:
1080 return get_msr_mtrr(vcpu, msr, pdata);
1081 case 0xcd: /* fsb frequency */
1082 data = 3;
1083 break;
1084 case MSR_IA32_APICBASE:
1085 data = kvm_get_apic_base(vcpu);
1086 break;
1087 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1088 return kvm_x2apic_msr_read(vcpu, msr, pdata);
1089 break;
1090 case MSR_IA32_MISC_ENABLE:
1091 data = vcpu->arch.ia32_misc_enable_msr;
1092 break;
1093 case MSR_IA32_PERF_STATUS:
1094 /* TSC increment by tick */
1095 data = 1000ULL;
1096 /* CPU multiplier */
1097 data |= (((uint64_t)4ULL) << 40);
1098 break;
1099 case MSR_EFER:
1100 data = vcpu->arch.shadow_efer;
1101 break;
1102 case MSR_KVM_WALL_CLOCK:
1103 data = vcpu->kvm->arch.wall_clock;
1104 break;
1105 case MSR_KVM_SYSTEM_TIME:
1106 data = vcpu->arch.time;
1107 break;
1108 case MSR_IA32_P5_MC_ADDR:
1109 case MSR_IA32_P5_MC_TYPE:
1110 case MSR_IA32_MCG_CAP:
1111 case MSR_IA32_MCG_CTL:
1112 case MSR_IA32_MCG_STATUS:
1113 case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1114 return get_msr_mce(vcpu, msr, pdata);
1115 default:
1116 if (!ignore_msrs) {
1117 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1118 return 1;
1119 } else {
1120 pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
1121 data = 0;
1122 }
1123 break;
1124 }
1125 *pdata = data;
1126 return 0;
1127 }
1128 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1129
1130 /*
1131 * Read or write a bunch of msrs. All parameters are kernel addresses.
1132 *
1133 * @return number of msrs set successfully.
1134 */
1135 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
1136 struct kvm_msr_entry *entries,
1137 int (*do_msr)(struct kvm_vcpu *vcpu,
1138 unsigned index, u64 *data))
1139 {
1140 int i;
1141
1142 vcpu_load(vcpu);
1143
1144 down_read(&vcpu->kvm->slots_lock);
1145 for (i = 0; i < msrs->nmsrs; ++i)
1146 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1147 break;
1148 up_read(&vcpu->kvm->slots_lock);
1149
1150 vcpu_put(vcpu);
1151
1152 return i;
1153 }
1154
1155 /*
1156 * Read or write a bunch of msrs. Parameters are user addresses.
1157 *
1158 * @return number of msrs set successfully.
1159 */
1160 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
1161 int (*do_msr)(struct kvm_vcpu *vcpu,
1162 unsigned index, u64 *data),
1163 int writeback)
1164 {
1165 struct kvm_msrs msrs;
1166 struct kvm_msr_entry *entries;
1167 int r, n;
1168 unsigned size;
1169
1170 r = -EFAULT;
1171 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1172 goto out;
1173
1174 r = -E2BIG;
1175 if (msrs.nmsrs >= MAX_IO_MSRS)
1176 goto out;
1177
1178 r = -ENOMEM;
1179 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1180 entries = vmalloc(size);
1181 if (!entries)
1182 goto out;
1183
1184 r = -EFAULT;
1185 if (copy_from_user(entries, user_msrs->entries, size))
1186 goto out_free;
1187
1188 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
1189 if (r < 0)
1190 goto out_free;
1191
1192 r = -EFAULT;
1193 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1194 goto out_free;
1195
1196 r = n;
1197
1198 out_free:
1199 vfree(entries);
1200 out:
1201 return r;
1202 }
1203
1204 int kvm_dev_ioctl_check_extension(long ext)
1205 {
1206 int r;
1207
1208 switch (ext) {
1209 case KVM_CAP_IRQCHIP:
1210 case KVM_CAP_HLT:
1211 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
1212 case KVM_CAP_SET_TSS_ADDR:
1213 case KVM_CAP_EXT_CPUID:
1214 case KVM_CAP_CLOCKSOURCE:
1215 case KVM_CAP_PIT:
1216 case KVM_CAP_NOP_IO_DELAY:
1217 case KVM_CAP_MP_STATE:
1218 case KVM_CAP_SYNC_MMU:
1219 case KVM_CAP_REINJECT_CONTROL:
1220 case KVM_CAP_IRQ_INJECT_STATUS:
1221 case KVM_CAP_ASSIGN_DEV_IRQ:
1222 case KVM_CAP_IRQFD:
1223 case KVM_CAP_IOEVENTFD:
1224 case KVM_CAP_PIT2:
1225 case KVM_CAP_PIT_STATE2:
1226 case KVM_CAP_SET_IDENTITY_MAP_ADDR:
1227 r = 1;
1228 break;
1229 case KVM_CAP_COALESCED_MMIO:
1230 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
1231 break;
1232 case KVM_CAP_VAPIC:
1233 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
1234 break;
1235 case KVM_CAP_NR_VCPUS:
1236 r = KVM_MAX_VCPUS;
1237 break;
1238 case KVM_CAP_NR_MEMSLOTS:
1239 r = KVM_MEMORY_SLOTS;
1240 break;
1241 case KVM_CAP_PV_MMU:
1242 r = !tdp_enabled;
1243 break;
1244 case KVM_CAP_IOMMU:
1245 r = iommu_found();
1246 break;
1247 case KVM_CAP_MCE:
1248 r = KVM_MAX_MCE_BANKS;
1249 break;
1250 default:
1251 r = 0;
1252 break;
1253 }
1254 return r;
1255
1256 }
1257
1258 long kvm_arch_dev_ioctl(struct file *filp,
1259 unsigned int ioctl, unsigned long arg)
1260 {
1261 void __user *argp = (void __user *)arg;
1262 long r;
1263
1264 switch (ioctl) {
1265 case KVM_GET_MSR_INDEX_LIST: {
1266 struct kvm_msr_list __user *user_msr_list = argp;
1267 struct kvm_msr_list msr_list;
1268 unsigned n;
1269
1270 r = -EFAULT;
1271 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1272 goto out;
1273 n = msr_list.nmsrs;
1274 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
1275 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1276 goto out;
1277 r = -E2BIG;
1278 if (n < msr_list.nmsrs)
1279 goto out;
1280 r = -EFAULT;
1281 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1282 num_msrs_to_save * sizeof(u32)))
1283 goto out;
1284 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
1285 &emulated_msrs,
1286 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1287 goto out;
1288 r = 0;
1289 break;
1290 }
1291 case KVM_GET_SUPPORTED_CPUID: {
1292 struct kvm_cpuid2 __user *cpuid_arg = argp;
1293 struct kvm_cpuid2 cpuid;
1294
1295 r = -EFAULT;
1296 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1297 goto out;
1298 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
1299 cpuid_arg->entries);
1300 if (r)
1301 goto out;
1302
1303 r = -EFAULT;
1304 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1305 goto out;
1306 r = 0;
1307 break;
1308 }
1309 case KVM_X86_GET_MCE_CAP_SUPPORTED: {
1310 u64 mce_cap;
1311
1312 mce_cap = KVM_MCE_CAP_SUPPORTED;
1313 r = -EFAULT;
1314 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
1315 goto out;
1316 r = 0;
1317 break;
1318 }
1319 default:
1320 r = -EINVAL;
1321 }
1322 out:
1323 return r;
1324 }
1325
1326 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1327 {
1328 kvm_x86_ops->vcpu_load(vcpu, cpu);
1329 kvm_request_guest_time_update(vcpu);
1330 }
1331
1332 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
1333 {
1334 kvm_x86_ops->vcpu_put(vcpu);
1335 kvm_put_guest_fpu(vcpu);
1336 }
1337
1338 static int is_efer_nx(void)
1339 {
1340 unsigned long long efer = 0;
1341
1342 rdmsrl_safe(MSR_EFER, &efer);
1343 return efer & EFER_NX;
1344 }
1345
1346 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
1347 {
1348 int i;
1349 struct kvm_cpuid_entry2 *e, *entry;
1350
1351 entry = NULL;
1352 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
1353 e = &vcpu->arch.cpuid_entries[i];
1354 if (e->function == 0x80000001) {
1355 entry = e;
1356 break;
1357 }
1358 }
1359 if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
1360 entry->edx &= ~(1 << 20);
1361 printk(KERN_INFO "kvm: guest NX capability removed\n");
1362 }
1363 }
1364
1365 /* when an old userspace process fills a new kernel module */
1366 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
1367 struct kvm_cpuid *cpuid,
1368 struct kvm_cpuid_entry __user *entries)
1369 {
1370 int r, i;
1371 struct kvm_cpuid_entry *cpuid_entries;
1372
1373 r = -E2BIG;
1374 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1375 goto out;
1376 r = -ENOMEM;
1377 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
1378 if (!cpuid_entries)
1379 goto out;
1380 r = -EFAULT;
1381 if (copy_from_user(cpuid_entries, entries,
1382 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
1383 goto out_free;
1384 for (i = 0; i < cpuid->nent; i++) {
1385 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
1386 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
1387 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
1388 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
1389 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
1390 vcpu->arch.cpuid_entries[i].index = 0;
1391 vcpu->arch.cpuid_entries[i].flags = 0;
1392 vcpu->arch.cpuid_entries[i].padding[0] = 0;
1393 vcpu->arch.cpuid_entries[i].padding[1] = 0;
1394 vcpu->arch.cpuid_entries[i].padding[2] = 0;
1395 }
1396 vcpu->arch.cpuid_nent = cpuid->nent;
1397 cpuid_fix_nx_cap(vcpu);
1398 r = 0;
1399 kvm_apic_set_version(vcpu);
1400
1401 out_free:
1402 vfree(cpuid_entries);
1403 out:
1404 return r;
1405 }
1406
1407 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
1408 struct kvm_cpuid2 *cpuid,
1409 struct kvm_cpuid_entry2 __user *entries)
1410 {
1411 int r;
1412
1413 r = -E2BIG;
1414 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1415 goto out;
1416 r = -EFAULT;
1417 if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
1418 cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
1419 goto out;
1420 vcpu->arch.cpuid_nent = cpuid->nent;
1421 kvm_apic_set_version(vcpu);
1422 return 0;
1423
1424 out:
1425 return r;
1426 }
1427
1428 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
1429 struct kvm_cpuid2 *cpuid,
1430 struct kvm_cpuid_entry2 __user *entries)
1431 {
1432 int r;
1433
1434 r = -E2BIG;
1435 if (cpuid->nent < vcpu->arch.cpuid_nent)
1436 goto out;
1437 r = -EFAULT;
1438 if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
1439 vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
1440 goto out;
1441 return 0;
1442
1443 out:
1444 cpuid->nent = vcpu->arch.cpuid_nent;
1445 return r;
1446 }
1447
1448 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1449 u32 index)
1450 {
1451 entry->function = function;
1452 entry->index = index;
1453 cpuid_count(entry->function, entry->index,
1454 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
1455 entry->flags = 0;
1456 }
1457
1458 #define F(x) bit(X86_FEATURE_##x)
1459
1460 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1461 u32 index, int *nent, int maxnent)
1462 {
1463 unsigned f_nx = is_efer_nx() ? F(NX) : 0;
1464 unsigned f_gbpages = kvm_x86_ops->gb_page_enable() ? F(GBPAGES) : 0;
1465 #ifdef CONFIG_X86_64
1466 unsigned f_lm = F(LM);
1467 #else
1468 unsigned f_lm = 0;
1469 #endif
1470
1471 /* cpuid 1.edx */
1472 const u32 kvm_supported_word0_x86_features =
1473 F(FPU) | F(VME) | F(DE) | F(PSE) |
1474 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
1475 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
1476 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
1477 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) |
1478 0 /* Reserved, DS, ACPI */ | F(MMX) |
1479 F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
1480 0 /* HTT, TM, Reserved, PBE */;
1481 /* cpuid 0x80000001.edx */
1482 const u32 kvm_supported_word1_x86_features =
1483 F(FPU) | F(VME) | F(DE) | F(PSE) |
1484 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
1485 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
1486 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
1487 F(PAT) | F(PSE36) | 0 /* Reserved */ |
1488 f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
1489 F(FXSR) | F(FXSR_OPT) | f_gbpages | 0 /* RDTSCP */ |
1490 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
1491 /* cpuid 1.ecx */
1492 const u32 kvm_supported_word4_x86_features =
1493 F(XMM3) | 0 /* Reserved, DTES64, MONITOR */ |
1494 0 /* DS-CPL, VMX, SMX, EST */ |
1495 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
1496 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ |
1497 0 /* Reserved, DCA */ | F(XMM4_1) |
1498 F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
1499 0 /* Reserved, XSAVE, OSXSAVE */;
1500 /* cpuid 0x80000001.ecx */
1501 const u32 kvm_supported_word6_x86_features =
1502 F(LAHF_LM) | F(CMP_LEGACY) | F(SVM) | 0 /* ExtApicSpace */ |
1503 F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
1504 F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(SSE5) |
1505 0 /* SKINIT */ | 0 /* WDT */;
1506
1507 /* all calls to cpuid_count() should be made on the same cpu */
1508 get_cpu();
1509 do_cpuid_1_ent(entry, function, index);
1510 ++*nent;
1511
1512 switch (function) {
1513 case 0:
1514 entry->eax = min(entry->eax, (u32)0xb);
1515 break;
1516 case 1:
1517 entry->edx &= kvm_supported_word0_x86_features;
1518 entry->ecx &= kvm_supported_word4_x86_features;
1519 /* we support x2apic emulation even if host does not support
1520 * it since we emulate x2apic in software */
1521 entry->ecx |= F(X2APIC);
1522 break;
1523 /* function 2 entries are STATEFUL. That is, repeated cpuid commands
1524 * may return different values. This forces us to get_cpu() before
1525 * issuing the first command, and also to emulate this annoying behavior
1526 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
1527 case 2: {
1528 int t, times = entry->eax & 0xff;
1529
1530 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1531 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
1532 for (t = 1; t < times && *nent < maxnent; ++t) {
1533 do_cpuid_1_ent(&entry[t], function, 0);
1534 entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1535 ++*nent;
1536 }
1537 break;
1538 }
1539 /* function 4 and 0xb have additional index. */
1540 case 4: {
1541 int i, cache_type;
1542
1543 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1544 /* read more entries until cache_type is zero */
1545 for (i = 1; *nent < maxnent; ++i) {
1546 cache_type = entry[i - 1].eax & 0x1f;
1547 if (!cache_type)
1548 break;
1549 do_cpuid_1_ent(&entry[i], function, i);
1550 entry[i].flags |=
1551 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1552 ++*nent;
1553 }
1554 break;
1555 }
1556 case 0xb: {
1557 int i, level_type;
1558
1559 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1560 /* read more entries until level_type is zero */
1561 for (i = 1; *nent < maxnent; ++i) {
1562 level_type = entry[i - 1].ecx & 0xff00;
1563 if (!level_type)
1564 break;
1565 do_cpuid_1_ent(&entry[i], function, i);
1566 entry[i].flags |=
1567 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1568 ++*nent;
1569 }
1570 break;
1571 }
1572 case 0x80000000:
1573 entry->eax = min(entry->eax, 0x8000001a);
1574 break;
1575 case 0x80000001:
1576 entry->edx &= kvm_supported_word1_x86_features;
1577 entry->ecx &= kvm_supported_word6_x86_features;
1578 break;
1579 }
1580 put_cpu();
1581 }
1582
1583 #undef F
1584
1585 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
1586 struct kvm_cpuid_entry2 __user *entries)
1587 {
1588 struct kvm_cpuid_entry2 *cpuid_entries;
1589 int limit, nent = 0, r = -E2BIG;
1590 u32 func;
1591
1592 if (cpuid->nent < 1)
1593 goto out;
1594 r = -ENOMEM;
1595 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
1596 if (!cpuid_entries)
1597 goto out;
1598
1599 do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
1600 limit = cpuid_entries[0].eax;
1601 for (func = 1; func <= limit && nent < cpuid->nent; ++func)
1602 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1603 &nent, cpuid->nent);
1604 r = -E2BIG;
1605 if (nent >= cpuid->nent)
1606 goto out_free;
1607
1608 do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
1609 limit = cpuid_entries[nent - 1].eax;
1610 for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
1611 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1612 &nent, cpuid->nent);
1613 r = -E2BIG;
1614 if (nent >= cpuid->nent)
1615 goto out_free;
1616
1617 r = -EFAULT;
1618 if (copy_to_user(entries, cpuid_entries,
1619 nent * sizeof(struct kvm_cpuid_entry2)))
1620 goto out_free;
1621 cpuid->nent = nent;
1622 r = 0;
1623
1624 out_free:
1625 vfree(cpuid_entries);
1626 out:
1627 return r;
1628 }
1629
1630 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
1631 struct kvm_lapic_state *s)
1632 {
1633 vcpu_load(vcpu);
1634 memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
1635 vcpu_put(vcpu);
1636
1637 return 0;
1638 }
1639
1640 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
1641 struct kvm_lapic_state *s)
1642 {
1643 vcpu_load(vcpu);
1644 memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1645 kvm_apic_post_state_restore(vcpu);
1646 update_cr8_intercept(vcpu);
1647 vcpu_put(vcpu);
1648
1649 return 0;
1650 }
1651
1652 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1653 struct kvm_interrupt *irq)
1654 {
1655 if (irq->irq < 0 || irq->irq >= 256)
1656 return -EINVAL;
1657 if (irqchip_in_kernel(vcpu->kvm))
1658 return -ENXIO;
1659 vcpu_load(vcpu);
1660
1661 kvm_queue_interrupt(vcpu, irq->irq, false);
1662
1663 vcpu_put(vcpu);
1664
1665 return 0;
1666 }
1667
1668 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
1669 {
1670 vcpu_load(vcpu);
1671 kvm_inject_nmi(vcpu);
1672 vcpu_put(vcpu);
1673
1674 return 0;
1675 }
1676
1677 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
1678 struct kvm_tpr_access_ctl *tac)
1679 {
1680 if (tac->flags)
1681 return -EINVAL;
1682 vcpu->arch.tpr_access_reporting = !!tac->enabled;
1683 return 0;
1684 }
1685
1686 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
1687 u64 mcg_cap)
1688 {
1689 int r;
1690 unsigned bank_num = mcg_cap & 0xff, bank;
1691
1692 r = -EINVAL;
1693 if (!bank_num)
1694 goto out;
1695 if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
1696 goto out;
1697 r = 0;
1698 vcpu->arch.mcg_cap = mcg_cap;
1699 /* Init IA32_MCG_CTL to all 1s */
1700 if (mcg_cap & MCG_CTL_P)
1701 vcpu->arch.mcg_ctl = ~(u64)0;
1702 /* Init IA32_MCi_CTL to all 1s */
1703 for (bank = 0; bank < bank_num; bank++)
1704 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
1705 out:
1706 return r;
1707 }
1708
1709 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
1710 struct kvm_x86_mce *mce)
1711 {
1712 u64 mcg_cap = vcpu->arch.mcg_cap;
1713 unsigned bank_num = mcg_cap & 0xff;
1714 u64 *banks = vcpu->arch.mce_banks;
1715
1716 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
1717 return -EINVAL;
1718 /*
1719 * if IA32_MCG_CTL is not all 1s, the uncorrected error
1720 * reporting is disabled
1721 */
1722 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
1723 vcpu->arch.mcg_ctl != ~(u64)0)
1724 return 0;
1725 banks += 4 * mce->bank;
1726 /*
1727 * if IA32_MCi_CTL is not all 1s, the uncorrected error
1728 * reporting is disabled for the bank
1729 */
1730 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
1731 return 0;
1732 if (mce->status & MCI_STATUS_UC) {
1733 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
1734 !(vcpu->arch.cr4 & X86_CR4_MCE)) {
1735 printk(KERN_DEBUG "kvm: set_mce: "
1736 "injects mce exception while "
1737 "previous one is in progress!\n");
1738 set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
1739 return 0;
1740 }
1741 if (banks[1] & MCI_STATUS_VAL)
1742 mce->status |= MCI_STATUS_OVER;
1743 banks[2] = mce->addr;
1744 banks[3] = mce->misc;
1745 vcpu->arch.mcg_status = mce->mcg_status;
1746 banks[1] = mce->status;
1747 kvm_queue_exception(vcpu, MC_VECTOR);
1748 } else if (!(banks[1] & MCI_STATUS_VAL)
1749 || !(banks[1] & MCI_STATUS_UC)) {
1750 if (banks[1] & MCI_STATUS_VAL)
1751 mce->status |= MCI_STATUS_OVER;
1752 banks[2] = mce->addr;
1753 banks[3] = mce->misc;
1754 banks[1] = mce->status;
1755 } else
1756 banks[1] |= MCI_STATUS_OVER;
1757 return 0;
1758 }
1759
1760 long kvm_arch_vcpu_ioctl(struct file *filp,
1761 unsigned int ioctl, unsigned long arg)
1762 {
1763 struct kvm_vcpu *vcpu = filp->private_data;
1764 void __user *argp = (void __user *)arg;
1765 int r;
1766 struct kvm_lapic_state *lapic = NULL;
1767
1768 switch (ioctl) {
1769 case KVM_GET_LAPIC: {
1770 lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
1771
1772 r = -ENOMEM;
1773 if (!lapic)
1774 goto out;
1775 r = kvm_vcpu_ioctl_get_lapic(vcpu, lapic);
1776 if (r)
1777 goto out;
1778 r = -EFAULT;
1779 if (copy_to_user(argp, lapic, sizeof(struct kvm_lapic_state)))
1780 goto out;
1781 r = 0;
1782 break;
1783 }
1784 case KVM_SET_LAPIC: {
1785 lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
1786 r = -ENOMEM;
1787 if (!lapic)
1788 goto out;
1789 r = -EFAULT;
1790 if (copy_from_user(lapic, argp, sizeof(struct kvm_lapic_state)))
1791 goto out;
1792 r = kvm_vcpu_ioctl_set_lapic(vcpu, lapic);
1793 if (r)
1794 goto out;
1795 r = 0;
1796 break;
1797 }
1798 case KVM_INTERRUPT: {
1799 struct kvm_interrupt irq;
1800
1801 r = -EFAULT;
1802 if (copy_from_user(&irq, argp, sizeof irq))
1803 goto out;
1804 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
1805 if (r)
1806 goto out;
1807 r = 0;
1808 break;
1809 }
1810 case KVM_NMI: {
1811 r = kvm_vcpu_ioctl_nmi(vcpu);
1812 if (r)
1813 goto out;
1814 r = 0;
1815 break;
1816 }
1817 case KVM_SET_CPUID: {
1818 struct kvm_cpuid __user *cpuid_arg = argp;
1819 struct kvm_cpuid cpuid;
1820
1821 r = -EFAULT;
1822 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1823 goto out;
1824 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
1825 if (r)
1826 goto out;
1827 break;
1828 }
1829 case KVM_SET_CPUID2: {
1830 struct kvm_cpuid2 __user *cpuid_arg = argp;
1831 struct kvm_cpuid2 cpuid;
1832
1833 r = -EFAULT;
1834 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1835 goto out;
1836 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
1837 cpuid_arg->entries);
1838 if (r)
1839 goto out;
1840 break;
1841 }
1842 case KVM_GET_CPUID2: {
1843 struct kvm_cpuid2 __user *cpuid_arg = argp;
1844 struct kvm_cpuid2 cpuid;
1845
1846 r = -EFAULT;
1847 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1848 goto out;
1849 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
1850 cpuid_arg->entries);
1851 if (r)
1852 goto out;
1853 r = -EFAULT;
1854 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1855 goto out;
1856 r = 0;
1857 break;
1858 }
1859 case KVM_GET_MSRS:
1860 r = msr_io(vcpu, argp, kvm_get_msr, 1);
1861 break;
1862 case KVM_SET_MSRS:
1863 r = msr_io(vcpu, argp, do_set_msr, 0);
1864 break;
1865 case KVM_TPR_ACCESS_REPORTING: {
1866 struct kvm_tpr_access_ctl tac;
1867
1868 r = -EFAULT;
1869 if (copy_from_user(&tac, argp, sizeof tac))
1870 goto out;
1871 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
1872 if (r)
1873 goto out;
1874 r = -EFAULT;
1875 if (copy_to_user(argp, &tac, sizeof tac))
1876 goto out;
1877 r = 0;
1878 break;
1879 };
1880 case KVM_SET_VAPIC_ADDR: {
1881 struct kvm_vapic_addr va;
1882
1883 r = -EINVAL;
1884 if (!irqchip_in_kernel(vcpu->kvm))
1885 goto out;
1886 r = -EFAULT;
1887 if (copy_from_user(&va, argp, sizeof va))
1888 goto out;
1889 r = 0;
1890 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
1891 break;
1892 }
1893 case KVM_X86_SETUP_MCE: {
1894 u64 mcg_cap;
1895
1896 r = -EFAULT;
1897 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
1898 goto out;
1899 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
1900 break;
1901 }
1902 case KVM_X86_SET_MCE: {
1903 struct kvm_x86_mce mce;
1904
1905 r = -EFAULT;
1906 if (copy_from_user(&mce, argp, sizeof mce))
1907 goto out;
1908 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
1909 break;
1910 }
1911 default:
1912 r = -EINVAL;
1913 }
1914 out:
1915 kfree(lapic);
1916 return r;
1917 }
1918
1919 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
1920 {
1921 int ret;
1922
1923 if (addr > (unsigned int)(-3 * PAGE_SIZE))
1924 return -1;
1925 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
1926 return ret;
1927 }
1928
1929 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
1930 u64 ident_addr)
1931 {
1932 kvm->arch.ept_identity_map_addr = ident_addr;
1933 return 0;
1934 }
1935
1936 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
1937 u32 kvm_nr_mmu_pages)
1938 {
1939 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
1940 return -EINVAL;
1941
1942 down_write(&kvm->slots_lock);
1943 spin_lock(&kvm->mmu_lock);
1944
1945 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1946 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1947
1948 spin_unlock(&kvm->mmu_lock);
1949 up_write(&kvm->slots_lock);
1950 return 0;
1951 }
1952
1953 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
1954 {
1955 return kvm->arch.n_alloc_mmu_pages;
1956 }
1957
1958 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
1959 {
1960 int i;
1961 struct kvm_mem_alias *alias;
1962
1963 for (i = 0; i < kvm->arch.naliases; ++i) {
1964 alias = &kvm->arch.aliases[i];
1965 if (gfn >= alias->base_gfn
1966 && gfn < alias->base_gfn + alias->npages)
1967 return alias->target_gfn + gfn - alias->base_gfn;
1968 }
1969 return gfn;
1970 }
1971
1972 /*
1973 * Set a new alias region. Aliases map a portion of physical memory into
1974 * another portion. This is useful for memory windows, for example the PC
1975 * VGA region.
1976 */
1977 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
1978 struct kvm_memory_alias *alias)
1979 {
1980 int r, n;
1981 struct kvm_mem_alias *p;
1982
1983 r = -EINVAL;
1984 /* General sanity checks */
1985 if (alias->memory_size & (PAGE_SIZE - 1))
1986 goto out;
1987 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
1988 goto out;
1989 if (alias->slot >= KVM_ALIAS_SLOTS)
1990 goto out;
1991 if (alias->guest_phys_addr + alias->memory_size
1992 < alias->guest_phys_addr)
1993 goto out;
1994 if (alias->target_phys_addr + alias->memory_size
1995 < alias->target_phys_addr)
1996 goto out;
1997
1998 down_write(&kvm->slots_lock);
1999 spin_lock(&kvm->mmu_lock);
2000
2001 p = &kvm->arch.aliases[alias->slot];
2002 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
2003 p->npages = alias->memory_size >> PAGE_SHIFT;
2004 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
2005
2006 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
2007 if (kvm->arch.aliases[n - 1].npages)
2008 break;
2009 kvm->arch.naliases = n;
2010
2011 spin_unlock(&kvm->mmu_lock);
2012 kvm_mmu_zap_all(kvm);
2013
2014 up_write(&kvm->slots_lock);
2015
2016 return 0;
2017
2018 out:
2019 return r;
2020 }
2021
2022 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2023 {
2024 int r;
2025
2026 r = 0;
2027 switch (chip->chip_id) {
2028 case KVM_IRQCHIP_PIC_MASTER:
2029 memcpy(&chip->chip.pic,
2030 &pic_irqchip(kvm)->pics[0],
2031 sizeof(struct kvm_pic_state));
2032 break;
2033 case KVM_IRQCHIP_PIC_SLAVE:
2034 memcpy(&chip->chip.pic,
2035 &pic_irqchip(kvm)->pics[1],
2036 sizeof(struct kvm_pic_state));
2037 break;
2038 case KVM_IRQCHIP_IOAPIC:
2039 memcpy(&chip->chip.ioapic,
2040 ioapic_irqchip(kvm),
2041 sizeof(struct kvm_ioapic_state));
2042 break;
2043 default:
2044 r = -EINVAL;
2045 break;
2046 }
2047 return r;
2048 }
2049
2050 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2051 {
2052 int r;
2053
2054 r = 0;
2055 switch (chip->chip_id) {
2056 case KVM_IRQCHIP_PIC_MASTER:
2057 spin_lock(&pic_irqchip(kvm)->lock);
2058 memcpy(&pic_irqchip(kvm)->pics[0],
2059 &chip->chip.pic,
2060 sizeof(struct kvm_pic_state));
2061 spin_unlock(&pic_irqchip(kvm)->lock);
2062 break;
2063 case KVM_IRQCHIP_PIC_SLAVE:
2064 spin_lock(&pic_irqchip(kvm)->lock);
2065 memcpy(&pic_irqchip(kvm)->pics[1],
2066 &chip->chip.pic,
2067 sizeof(struct kvm_pic_state));
2068 spin_unlock(&pic_irqchip(kvm)->lock);
2069 break;
2070 case KVM_IRQCHIP_IOAPIC:
2071 mutex_lock(&kvm->irq_lock);
2072 memcpy(ioapic_irqchip(kvm),
2073 &chip->chip.ioapic,
2074 sizeof(struct kvm_ioapic_state));
2075 mutex_unlock(&kvm->irq_lock);
2076 break;
2077 default:
2078 r = -EINVAL;
2079 break;
2080 }
2081 kvm_pic_update_irq(pic_irqchip(kvm));
2082 return r;
2083 }
2084
2085 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
2086 {
2087 int r = 0;
2088
2089 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2090 memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
2091 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2092 return r;
2093 }
2094
2095 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
2096 {
2097 int r = 0;
2098
2099 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2100 memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
2101 kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
2102 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2103 return r;
2104 }
2105
2106 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
2107 {
2108 int r = 0;
2109
2110 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2111 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
2112 sizeof(ps->channels));
2113 ps->flags = kvm->arch.vpit->pit_state.flags;
2114 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2115 return r;
2116 }
2117
2118 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
2119 {
2120 int r = 0, start = 0;
2121 u32 prev_legacy, cur_legacy;
2122 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2123 prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
2124 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
2125 if (!prev_legacy && cur_legacy)
2126 start = 1;
2127 memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
2128 sizeof(kvm->arch.vpit->pit_state.channels));
2129 kvm->arch.vpit->pit_state.flags = ps->flags;
2130 kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
2131 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2132 return r;
2133 }
2134
2135 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
2136 struct kvm_reinject_control *control)
2137 {
2138 if (!kvm->arch.vpit)
2139 return -ENXIO;
2140 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2141 kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject;
2142 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2143 return 0;
2144 }
2145
2146 /*
2147 * Get (and clear) the dirty memory log for a memory slot.
2148 */
2149 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
2150 struct kvm_dirty_log *log)
2151 {
2152 int r;
2153 int n;
2154 struct kvm_memory_slot *memslot;
2155 int is_dirty = 0;
2156
2157 down_write(&kvm->slots_lock);
2158
2159 r = kvm_get_dirty_log(kvm, log, &is_dirty);
2160 if (r)
2161 goto out;
2162
2163 /* If nothing is dirty, don't bother messing with page tables. */
2164 if (is_dirty) {
2165 spin_lock(&kvm->mmu_lock);
2166 kvm_mmu_slot_remove_write_access(kvm, log->slot);
2167 spin_unlock(&kvm->mmu_lock);
2168 memslot = &kvm->memslots[log->slot];
2169 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
2170 memset(memslot->dirty_bitmap, 0, n);
2171 }
2172 r = 0;
2173 out:
2174 up_write(&kvm->slots_lock);
2175 return r;
2176 }
2177
2178 long kvm_arch_vm_ioctl(struct file *filp,
2179 unsigned int ioctl, unsigned long arg)
2180 {
2181 struct kvm *kvm = filp->private_data;
2182 void __user *argp = (void __user *)arg;
2183 int r = -EINVAL;
2184 /*
2185 * This union makes it completely explicit to gcc-3.x
2186 * that these two variables' stack usage should be
2187 * combined, not added together.
2188 */
2189 union {
2190 struct kvm_pit_state ps;
2191 struct kvm_pit_state2 ps2;
2192 struct kvm_memory_alias alias;
2193 struct kvm_pit_config pit_config;
2194 } u;
2195
2196 switch (ioctl) {
2197 case KVM_SET_TSS_ADDR:
2198 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
2199 if (r < 0)
2200 goto out;
2201 break;
2202 case KVM_SET_IDENTITY_MAP_ADDR: {
2203 u64 ident_addr;
2204
2205 r = -EFAULT;
2206 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
2207 goto out;
2208 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
2209 if (r < 0)
2210 goto out;
2211 break;
2212 }
2213 case KVM_SET_MEMORY_REGION: {
2214 struct kvm_memory_region kvm_mem;
2215 struct kvm_userspace_memory_region kvm_userspace_mem;
2216
2217 r = -EFAULT;
2218 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
2219 goto out;
2220 kvm_userspace_mem.slot = kvm_mem.slot;
2221 kvm_userspace_mem.flags = kvm_mem.flags;
2222 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
2223 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
2224 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
2225 if (r)
2226 goto out;
2227 break;
2228 }
2229 case KVM_SET_NR_MMU_PAGES:
2230 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
2231 if (r)
2232 goto out;
2233 break;
2234 case KVM_GET_NR_MMU_PAGES:
2235 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
2236 break;
2237 case KVM_SET_MEMORY_ALIAS:
2238 r = -EFAULT;
2239 if (copy_from_user(&u.alias, argp, sizeof(struct kvm_memory_alias)))
2240 goto out;
2241 r = kvm_vm_ioctl_set_memory_alias(kvm, &u.alias);
2242 if (r)
2243 goto out;
2244 break;
2245 case KVM_CREATE_IRQCHIP:
2246 r = -ENOMEM;
2247 kvm->arch.vpic = kvm_create_pic(kvm);
2248 if (kvm->arch.vpic) {
2249 r = kvm_ioapic_init(kvm);
2250 if (r) {
2251 kfree(kvm->arch.vpic);
2252 kvm->arch.vpic = NULL;
2253 goto out;
2254 }
2255 } else
2256 goto out;
2257 r = kvm_setup_default_irq_routing(kvm);
2258 if (r) {
2259 kfree(kvm->arch.vpic);
2260 kfree(kvm->arch.vioapic);
2261 goto out;
2262 }
2263 break;
2264 case KVM_CREATE_PIT:
2265 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
2266 goto create_pit;
2267 case KVM_CREATE_PIT2:
2268 r = -EFAULT;
2269 if (copy_from_user(&u.pit_config, argp,
2270 sizeof(struct kvm_pit_config)))
2271 goto out;
2272 create_pit:
2273 down_write(&kvm->slots_lock);
2274 r = -EEXIST;
2275 if (kvm->arch.vpit)
2276 goto create_pit_unlock;
2277 r = -ENOMEM;
2278 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
2279 if (kvm->arch.vpit)
2280 r = 0;
2281 create_pit_unlock:
2282 up_write(&kvm->slots_lock);
2283 break;
2284 case KVM_IRQ_LINE_STATUS:
2285 case KVM_IRQ_LINE: {
2286 struct kvm_irq_level irq_event;
2287
2288 r = -EFAULT;
2289 if (copy_from_user(&irq_event, argp, sizeof irq_event))
2290 goto out;
2291 if (irqchip_in_kernel(kvm)) {
2292 __s32 status;
2293 mutex_lock(&kvm->irq_lock);
2294 status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
2295 irq_event.irq, irq_event.level);
2296 mutex_unlock(&kvm->irq_lock);
2297 if (ioctl == KVM_IRQ_LINE_STATUS) {
2298 irq_event.status = status;
2299 if (copy_to_user(argp, &irq_event,
2300 sizeof irq_event))
2301 goto out;
2302 }
2303 r = 0;
2304 }
2305 break;
2306 }
2307 case KVM_GET_IRQCHIP: {
2308 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
2309 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
2310
2311 r = -ENOMEM;
2312 if (!chip)
2313 goto out;
2314 r = -EFAULT;
2315 if (copy_from_user(chip, argp, sizeof *chip))
2316 goto get_irqchip_out;
2317 r = -ENXIO;
2318 if (!irqchip_in_kernel(kvm))
2319 goto get_irqchip_out;
2320 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
2321 if (r)
2322 goto get_irqchip_out;
2323 r = -EFAULT;
2324 if (copy_to_user(argp, chip, sizeof *chip))
2325 goto get_irqchip_out;
2326 r = 0;
2327 get_irqchip_out:
2328 kfree(chip);
2329 if (r)
2330 goto out;
2331 break;
2332 }
2333 case KVM_SET_IRQCHIP: {
2334 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
2335 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
2336
2337 r = -ENOMEM;
2338 if (!chip)
2339 goto out;
2340 r = -EFAULT;
2341 if (copy_from_user(chip, argp, sizeof *chip))
2342 goto set_irqchip_out;
2343 r = -ENXIO;
2344 if (!irqchip_in_kernel(kvm))
2345 goto set_irqchip_out;
2346 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
2347 if (r)
2348 goto set_irqchip_out;
2349 r = 0;
2350 set_irqchip_out:
2351 kfree(chip);
2352 if (r)
2353 goto out;
2354 break;
2355 }
2356 case KVM_GET_PIT: {
2357 r = -EFAULT;
2358 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
2359 goto out;
2360 r = -ENXIO;
2361 if (!kvm->arch.vpit)
2362 goto out;
2363 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
2364 if (r)
2365 goto out;
2366 r = -EFAULT;
2367 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
2368 goto out;
2369 r = 0;
2370 break;
2371 }
2372 case KVM_SET_PIT: {
2373 r = -EFAULT;
2374 if (copy_from_user(&u.ps, argp, sizeof u.ps))
2375 goto out;
2376 r = -ENXIO;
2377 if (!kvm->arch.vpit)
2378 goto out;
2379 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
2380 if (r)
2381 goto out;
2382 r = 0;
2383 break;
2384 }
2385 case KVM_GET_PIT2: {
2386 r = -ENXIO;
2387 if (!kvm->arch.vpit)
2388 goto out;
2389 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
2390 if (r)
2391 goto out;
2392 r = -EFAULT;
2393 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
2394 goto out;
2395 r = 0;
2396 break;
2397 }
2398 case KVM_SET_PIT2: {
2399 r = -EFAULT;
2400 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
2401 goto out;
2402 r = -ENXIO;
2403 if (!kvm->arch.vpit)
2404 goto out;
2405 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
2406 if (r)
2407 goto out;
2408 r = 0;
2409 break;
2410 }
2411 case KVM_REINJECT_CONTROL: {
2412 struct kvm_reinject_control control;
2413 r = -EFAULT;
2414 if (copy_from_user(&control, argp, sizeof(control)))
2415 goto out;
2416 r = kvm_vm_ioctl_reinject(kvm, &control);
2417 if (r)
2418 goto out;
2419 r = 0;
2420 break;
2421 }
2422 default:
2423 ;
2424 }
2425 out:
2426 return r;
2427 }
2428
2429 static void kvm_init_msr_list(void)
2430 {
2431 u32 dummy[2];
2432 unsigned i, j;
2433
2434 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2435 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2436 continue;
2437 if (j < i)
2438 msrs_to_save[j] = msrs_to_save[i];
2439 j++;
2440 }
2441 num_msrs_to_save = j;
2442 }
2443
2444 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
2445 const void *v)
2446 {
2447 if (vcpu->arch.apic &&
2448 !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, len, v))
2449 return 0;
2450
2451 return kvm_io_bus_write(&vcpu->kvm->mmio_bus, addr, len, v);
2452 }
2453
2454 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
2455 {
2456 if (vcpu->arch.apic &&
2457 !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, len, v))
2458 return 0;
2459
2460 return kvm_io_bus_read(&vcpu->kvm->mmio_bus, addr, len, v);
2461 }
2462
2463 static int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
2464 struct kvm_vcpu *vcpu)
2465 {
2466 void *data = val;
2467 int r = X86EMUL_CONTINUE;
2468
2469 while (bytes) {
2470 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2471 unsigned offset = addr & (PAGE_SIZE-1);
2472 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
2473 int ret;
2474
2475 if (gpa == UNMAPPED_GVA) {
2476 r = X86EMUL_PROPAGATE_FAULT;
2477 goto out;
2478 }
2479 ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
2480 if (ret < 0) {
2481 r = X86EMUL_UNHANDLEABLE;
2482 goto out;
2483 }
2484
2485 bytes -= toread;
2486 data += toread;
2487 addr += toread;
2488 }
2489 out:
2490 return r;
2491 }
2492
2493 static int kvm_write_guest_virt(gva_t addr, void *val, unsigned int bytes,
2494 struct kvm_vcpu *vcpu)
2495 {
2496 void *data = val;
2497 int r = X86EMUL_CONTINUE;
2498
2499 while (bytes) {
2500 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2501 unsigned offset = addr & (PAGE_SIZE-1);
2502 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
2503 int ret;
2504
2505 if (gpa == UNMAPPED_GVA) {
2506 r = X86EMUL_PROPAGATE_FAULT;
2507 goto out;
2508 }
2509 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
2510 if (ret < 0) {
2511 r = X86EMUL_UNHANDLEABLE;
2512 goto out;
2513 }
2514
2515 bytes -= towrite;
2516 data += towrite;
2517 addr += towrite;
2518 }
2519 out:
2520 return r;
2521 }
2522
2523
2524 static int emulator_read_emulated(unsigned long addr,
2525 void *val,
2526 unsigned int bytes,
2527 struct kvm_vcpu *vcpu)
2528 {
2529 gpa_t gpa;
2530
2531 if (vcpu->mmio_read_completed) {
2532 memcpy(val, vcpu->mmio_data, bytes);
2533 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
2534 vcpu->mmio_phys_addr, *(u64 *)val);
2535 vcpu->mmio_read_completed = 0;
2536 return X86EMUL_CONTINUE;
2537 }
2538
2539 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2540
2541 /* For APIC access vmexit */
2542 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2543 goto mmio;
2544
2545 if (kvm_read_guest_virt(addr, val, bytes, vcpu)
2546 == X86EMUL_CONTINUE)
2547 return X86EMUL_CONTINUE;
2548 if (gpa == UNMAPPED_GVA)
2549 return X86EMUL_PROPAGATE_FAULT;
2550
2551 mmio:
2552 /*
2553 * Is this MMIO handled locally?
2554 */
2555 if (!vcpu_mmio_read(vcpu, gpa, bytes, val)) {
2556 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, gpa, *(u64 *)val);
2557 return X86EMUL_CONTINUE;
2558 }
2559
2560 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
2561
2562 vcpu->mmio_needed = 1;
2563 vcpu->mmio_phys_addr = gpa;
2564 vcpu->mmio_size = bytes;
2565 vcpu->mmio_is_write = 0;
2566
2567 return X86EMUL_UNHANDLEABLE;
2568 }
2569
2570 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
2571 const void *val, int bytes)
2572 {
2573 int ret;
2574
2575 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
2576 if (ret < 0)
2577 return 0;
2578 kvm_mmu_pte_write(vcpu, gpa, val, bytes, 1);
2579 return 1;
2580 }
2581
2582 static int emulator_write_emulated_onepage(unsigned long addr,
2583 const void *val,
2584 unsigned int bytes,
2585 struct kvm_vcpu *vcpu)
2586 {
2587 gpa_t gpa;
2588
2589 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2590
2591 if (gpa == UNMAPPED_GVA) {
2592 kvm_inject_page_fault(vcpu, addr, 2);
2593 return X86EMUL_PROPAGATE_FAULT;
2594 }
2595
2596 /* For APIC access vmexit */
2597 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2598 goto mmio;
2599
2600 if (emulator_write_phys(vcpu, gpa, val, bytes))
2601 return X86EMUL_CONTINUE;
2602
2603 mmio:
2604 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
2605 /*
2606 * Is this MMIO handled locally?
2607 */
2608 if (!vcpu_mmio_write(vcpu, gpa, bytes, val))
2609 return X86EMUL_CONTINUE;
2610
2611 vcpu->mmio_needed = 1;
2612 vcpu->mmio_phys_addr = gpa;
2613 vcpu->mmio_size = bytes;
2614 vcpu->mmio_is_write = 1;
2615 memcpy(vcpu->mmio_data, val, bytes);
2616
2617 return X86EMUL_CONTINUE;
2618 }
2619
2620 int emulator_write_emulated(unsigned long addr,
2621 const void *val,
2622 unsigned int bytes,
2623 struct kvm_vcpu *vcpu)
2624 {
2625 /* Crossing a page boundary? */
2626 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
2627 int rc, now;
2628
2629 now = -addr & ~PAGE_MASK;
2630 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
2631 if (rc != X86EMUL_CONTINUE)
2632 return rc;
2633 addr += now;
2634 val += now;
2635 bytes -= now;
2636 }
2637 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
2638 }
2639 EXPORT_SYMBOL_GPL(emulator_write_emulated);
2640
2641 static int emulator_cmpxchg_emulated(unsigned long addr,
2642 const void *old,
2643 const void *new,
2644 unsigned int bytes,
2645 struct kvm_vcpu *vcpu)
2646 {
2647 printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
2648 #ifndef CONFIG_X86_64
2649 /* guests cmpxchg8b have to be emulated atomically */
2650 if (bytes == 8) {
2651 gpa_t gpa;
2652 struct page *page;
2653 char *kaddr;
2654 u64 val;
2655
2656 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2657
2658 if (gpa == UNMAPPED_GVA ||
2659 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2660 goto emul_write;
2661
2662 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
2663 goto emul_write;
2664
2665 val = *(u64 *)new;
2666
2667 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
2668
2669 kaddr = kmap_atomic(page, KM_USER0);
2670 set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
2671 kunmap_atomic(kaddr, KM_USER0);
2672 kvm_release_page_dirty(page);
2673 }
2674 emul_write:
2675 #endif
2676
2677 return emulator_write_emulated(addr, new, bytes, vcpu);
2678 }
2679
2680 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
2681 {
2682 return kvm_x86_ops->get_segment_base(vcpu, seg);
2683 }
2684
2685 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
2686 {
2687 kvm_mmu_invlpg(vcpu, address);
2688 return X86EMUL_CONTINUE;
2689 }
2690
2691 int emulate_clts(struct kvm_vcpu *vcpu)
2692 {
2693 kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
2694 return X86EMUL_CONTINUE;
2695 }
2696
2697 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
2698 {
2699 struct kvm_vcpu *vcpu = ctxt->vcpu;
2700
2701 switch (dr) {
2702 case 0 ... 3:
2703 *dest = kvm_x86_ops->get_dr(vcpu, dr);
2704 return X86EMUL_CONTINUE;
2705 default:
2706 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __func__, dr);
2707 return X86EMUL_UNHANDLEABLE;
2708 }
2709 }
2710
2711 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
2712 {
2713 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
2714 int exception;
2715
2716 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
2717 if (exception) {
2718 /* FIXME: better handling */
2719 return X86EMUL_UNHANDLEABLE;
2720 }
2721 return X86EMUL_CONTINUE;
2722 }
2723
2724 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
2725 {
2726 u8 opcodes[4];
2727 unsigned long rip = kvm_rip_read(vcpu);
2728 unsigned long rip_linear;
2729
2730 if (!printk_ratelimit())
2731 return;
2732
2733 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
2734
2735 kvm_read_guest_virt(rip_linear, (void *)opcodes, 4, vcpu);
2736
2737 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
2738 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
2739 }
2740 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
2741
2742 static struct x86_emulate_ops emulate_ops = {
2743 .read_std = kvm_read_guest_virt,
2744 .read_emulated = emulator_read_emulated,
2745 .write_emulated = emulator_write_emulated,
2746 .cmpxchg_emulated = emulator_cmpxchg_emulated,
2747 };
2748
2749 static void cache_all_regs(struct kvm_vcpu *vcpu)
2750 {
2751 kvm_register_read(vcpu, VCPU_REGS_RAX);
2752 kvm_register_read(vcpu, VCPU_REGS_RSP);
2753 kvm_register_read(vcpu, VCPU_REGS_RIP);
2754 vcpu->arch.regs_dirty = ~0;
2755 }
2756
2757 int emulate_instruction(struct kvm_vcpu *vcpu,
2758 struct kvm_run *run,
2759 unsigned long cr2,
2760 u16 error_code,
2761 int emulation_type)
2762 {
2763 int r, shadow_mask;
2764 struct decode_cache *c;
2765
2766 kvm_clear_exception_queue(vcpu);
2767 vcpu->arch.mmio_fault_cr2 = cr2;
2768 /*
2769 * TODO: fix emulate.c to use guest_read/write_register
2770 * instead of direct ->regs accesses, can save hundred cycles
2771 * on Intel for instructions that don't read/change RSP, for
2772 * for example.
2773 */
2774 cache_all_regs(vcpu);
2775
2776 vcpu->mmio_is_write = 0;
2777 vcpu->arch.pio.string = 0;
2778
2779 if (!(emulation_type & EMULTYPE_NO_DECODE)) {
2780 int cs_db, cs_l;
2781 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
2782
2783 vcpu->arch.emulate_ctxt.vcpu = vcpu;
2784 vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
2785 vcpu->arch.emulate_ctxt.mode =
2786 (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
2787 ? X86EMUL_MODE_REAL : cs_l
2788 ? X86EMUL_MODE_PROT64 : cs_db
2789 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
2790
2791 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2792
2793 /* Only allow emulation of specific instructions on #UD
2794 * (namely VMMCALL, sysenter, sysexit, syscall)*/
2795 c = &vcpu->arch.emulate_ctxt.decode;
2796 if (emulation_type & EMULTYPE_TRAP_UD) {
2797 if (!c->twobyte)
2798 return EMULATE_FAIL;
2799 switch (c->b) {
2800 case 0x01: /* VMMCALL */
2801 if (c->modrm_mod != 3 || c->modrm_rm != 1)
2802 return EMULATE_FAIL;
2803 break;
2804 case 0x34: /* sysenter */
2805 case 0x35: /* sysexit */
2806 if (c->modrm_mod != 0 || c->modrm_rm != 0)
2807 return EMULATE_FAIL;
2808 break;
2809 case 0x05: /* syscall */
2810 if (c->modrm_mod != 0 || c->modrm_rm != 0)
2811 return EMULATE_FAIL;
2812 break;
2813 default:
2814 return EMULATE_FAIL;
2815 }
2816
2817 if (!(c->modrm_reg == 0 || c->modrm_reg == 3))
2818 return EMULATE_FAIL;
2819 }
2820
2821 ++vcpu->stat.insn_emulation;
2822 if (r) {
2823 ++vcpu->stat.insn_emulation_fail;
2824 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2825 return EMULATE_DONE;
2826 return EMULATE_FAIL;
2827 }
2828 }
2829
2830 if (emulation_type & EMULTYPE_SKIP) {
2831 kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.decode.eip);
2832 return EMULATE_DONE;
2833 }
2834
2835 r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2836 shadow_mask = vcpu->arch.emulate_ctxt.interruptibility;
2837
2838 if (r == 0)
2839 kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask);
2840
2841 if (vcpu->arch.pio.string)
2842 return EMULATE_DO_MMIO;
2843
2844 if ((r || vcpu->mmio_is_write) && run) {
2845 run->exit_reason = KVM_EXIT_MMIO;
2846 run->mmio.phys_addr = vcpu->mmio_phys_addr;
2847 memcpy(run->mmio.data, vcpu->mmio_data, 8);
2848 run->mmio.len = vcpu->mmio_size;
2849 run->mmio.is_write = vcpu->mmio_is_write;
2850 }
2851
2852 if (r) {
2853 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2854 return EMULATE_DONE;
2855 if (!vcpu->mmio_needed) {
2856 kvm_report_emulation_failure(vcpu, "mmio");
2857 return EMULATE_FAIL;
2858 }
2859 return EMULATE_DO_MMIO;
2860 }
2861
2862 kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
2863
2864 if (vcpu->mmio_is_write) {
2865 vcpu->mmio_needed = 0;
2866 return EMULATE_DO_MMIO;
2867 }
2868
2869 return EMULATE_DONE;
2870 }
2871 EXPORT_SYMBOL_GPL(emulate_instruction);
2872
2873 static int pio_copy_data(struct kvm_vcpu *vcpu)
2874 {
2875 void *p = vcpu->arch.pio_data;
2876 gva_t q = vcpu->arch.pio.guest_gva;
2877 unsigned bytes;
2878 int ret;
2879
2880 bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
2881 if (vcpu->arch.pio.in)
2882 ret = kvm_write_guest_virt(q, p, bytes, vcpu);
2883 else
2884 ret = kvm_read_guest_virt(q, p, bytes, vcpu);
2885 return ret;
2886 }
2887
2888 int complete_pio(struct kvm_vcpu *vcpu)
2889 {
2890 struct kvm_pio_request *io = &vcpu->arch.pio;
2891 long delta;
2892 int r;
2893 unsigned long val;
2894
2895 if (!io->string) {
2896 if (io->in) {
2897 val = kvm_register_read(vcpu, VCPU_REGS_RAX);
2898 memcpy(&val, vcpu->arch.pio_data, io->size);
2899 kvm_register_write(vcpu, VCPU_REGS_RAX, val);
2900 }
2901 } else {
2902 if (io->in) {
2903 r = pio_copy_data(vcpu);
2904 if (r)
2905 return r;
2906 }
2907
2908 delta = 1;
2909 if (io->rep) {
2910 delta *= io->cur_count;
2911 /*
2912 * The size of the register should really depend on
2913 * current address size.
2914 */
2915 val = kvm_register_read(vcpu, VCPU_REGS_RCX);
2916 val -= delta;
2917 kvm_register_write(vcpu, VCPU_REGS_RCX, val);
2918 }
2919 if (io->down)
2920 delta = -delta;
2921 delta *= io->size;
2922 if (io->in) {
2923 val = kvm_register_read(vcpu, VCPU_REGS_RDI);
2924 val += delta;
2925 kvm_register_write(vcpu, VCPU_REGS_RDI, val);
2926 } else {
2927 val = kvm_register_read(vcpu, VCPU_REGS_RSI);
2928 val += delta;
2929 kvm_register_write(vcpu, VCPU_REGS_RSI, val);
2930 }
2931 }
2932
2933 io->count -= io->cur_count;
2934 io->cur_count = 0;
2935
2936 return 0;
2937 }
2938
2939 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
2940 {
2941 /* TODO: String I/O for in kernel device */
2942 int r;
2943
2944 if (vcpu->arch.pio.in)
2945 r = kvm_io_bus_read(&vcpu->kvm->pio_bus, vcpu->arch.pio.port,
2946 vcpu->arch.pio.size, pd);
2947 else
2948 r = kvm_io_bus_write(&vcpu->kvm->pio_bus, vcpu->arch.pio.port,
2949 vcpu->arch.pio.size, pd);
2950 return r;
2951 }
2952
2953 static int pio_string_write(struct kvm_vcpu *vcpu)
2954 {
2955 struct kvm_pio_request *io = &vcpu->arch.pio;
2956 void *pd = vcpu->arch.pio_data;
2957 int i, r = 0;
2958
2959 for (i = 0; i < io->cur_count; i++) {
2960 if (kvm_io_bus_write(&vcpu->kvm->pio_bus,
2961 io->port, io->size, pd)) {
2962 r = -EOPNOTSUPP;
2963 break;
2964 }
2965 pd += io->size;
2966 }
2967 return r;
2968 }
2969
2970 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2971 int size, unsigned port)
2972 {
2973 unsigned long val;
2974
2975 vcpu->run->exit_reason = KVM_EXIT_IO;
2976 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2977 vcpu->run->io.size = vcpu->arch.pio.size = size;
2978 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2979 vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1;
2980 vcpu->run->io.port = vcpu->arch.pio.port = port;
2981 vcpu->arch.pio.in = in;
2982 vcpu->arch.pio.string = 0;
2983 vcpu->arch.pio.down = 0;
2984 vcpu->arch.pio.rep = 0;
2985
2986 trace_kvm_pio(vcpu->run->io.direction == KVM_EXIT_IO_OUT, port,
2987 size, 1);
2988
2989 val = kvm_register_read(vcpu, VCPU_REGS_RAX);
2990 memcpy(vcpu->arch.pio_data, &val, 4);
2991
2992 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
2993 complete_pio(vcpu);
2994 return 1;
2995 }
2996 return 0;
2997 }
2998 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
2999
3000 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
3001 int size, unsigned long count, int down,
3002 gva_t address, int rep, unsigned port)
3003 {
3004 unsigned now, in_page;
3005 int ret = 0;
3006
3007 vcpu->run->exit_reason = KVM_EXIT_IO;
3008 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
3009 vcpu->run->io.size = vcpu->arch.pio.size = size;
3010 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
3011 vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count;
3012 vcpu->run->io.port = vcpu->arch.pio.port = port;
3013 vcpu->arch.pio.in = in;
3014 vcpu->arch.pio.string = 1;
3015 vcpu->arch.pio.down = down;
3016 vcpu->arch.pio.rep = rep;
3017
3018 trace_kvm_pio(vcpu->run->io.direction == KVM_EXIT_IO_OUT, port,
3019 size, count);
3020
3021 if (!count) {
3022 kvm_x86_ops->skip_emulated_instruction(vcpu);
3023 return 1;
3024 }
3025
3026 if (!down)
3027 in_page = PAGE_SIZE - offset_in_page(address);
3028 else
3029 in_page = offset_in_page(address) + size;
3030 now = min(count, (unsigned long)in_page / size);
3031 if (!now)
3032 now = 1;
3033 if (down) {
3034 /*
3035 * String I/O in reverse. Yuck. Kill the guest, fix later.
3036 */
3037 pr_unimpl(vcpu, "guest string pio down\n");
3038 kvm_inject_gp(vcpu, 0);
3039 return 1;
3040 }
3041 vcpu->run->io.count = now;
3042 vcpu->arch.pio.cur_count = now;
3043
3044 if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
3045 kvm_x86_ops->skip_emulated_instruction(vcpu);
3046
3047 vcpu->arch.pio.guest_gva = address;
3048
3049 if (!vcpu->arch.pio.in) {
3050 /* string PIO write */
3051 ret = pio_copy_data(vcpu);
3052 if (ret == X86EMUL_PROPAGATE_FAULT) {
3053 kvm_inject_gp(vcpu, 0);
3054 return 1;
3055 }
3056 if (ret == 0 && !pio_string_write(vcpu)) {
3057 complete_pio(vcpu);
3058 if (vcpu->arch.pio.count == 0)
3059 ret = 1;
3060 }
3061 }
3062 /* no string PIO read support yet */
3063
3064 return ret;
3065 }
3066 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
3067
3068 static void bounce_off(void *info)
3069 {
3070 /* nothing */
3071 }
3072
3073 static unsigned int ref_freq;
3074 static unsigned long tsc_khz_ref;
3075
3076 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
3077 void *data)
3078 {
3079 struct cpufreq_freqs *freq = data;
3080 struct kvm *kvm;
3081 struct kvm_vcpu *vcpu;
3082 int i, send_ipi = 0;
3083
3084 if (!ref_freq)
3085 ref_freq = freq->old;
3086
3087 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
3088 return 0;
3089 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
3090 return 0;
3091 per_cpu(cpu_tsc_khz, freq->cpu) = cpufreq_scale(tsc_khz_ref, ref_freq, freq->new);
3092
3093 spin_lock(&kvm_lock);
3094 list_for_each_entry(kvm, &vm_list, vm_list) {
3095 kvm_for_each_vcpu(i, vcpu, kvm) {
3096 if (vcpu->cpu != freq->cpu)
3097 continue;
3098 if (!kvm_request_guest_time_update(vcpu))
3099 continue;
3100 if (vcpu->cpu != smp_processor_id())
3101 send_ipi++;
3102 }
3103 }
3104 spin_unlock(&kvm_lock);
3105
3106 if (freq->old < freq->new && send_ipi) {
3107 /*
3108 * We upscale the frequency. Must make the guest
3109 * doesn't see old kvmclock values while running with
3110 * the new frequency, otherwise we risk the guest sees
3111 * time go backwards.
3112 *
3113 * In case we update the frequency for another cpu
3114 * (which might be in guest context) send an interrupt
3115 * to kick the cpu out of guest context. Next time
3116 * guest context is entered kvmclock will be updated,
3117 * so the guest will not see stale values.
3118 */
3119 smp_call_function_single(freq->cpu, bounce_off, NULL, 1);
3120 }
3121 return 0;
3122 }
3123
3124 static struct notifier_block kvmclock_cpufreq_notifier_block = {
3125 .notifier_call = kvmclock_cpufreq_notifier
3126 };
3127
3128 int kvm_arch_init(void *opaque)
3129 {
3130 int r, cpu;
3131 struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
3132
3133 if (kvm_x86_ops) {
3134 printk(KERN_ERR "kvm: already loaded the other module\n");
3135 r = -EEXIST;
3136 goto out;
3137 }
3138
3139 if (!ops->cpu_has_kvm_support()) {
3140 printk(KERN_ERR "kvm: no hardware support\n");
3141 r = -EOPNOTSUPP;
3142 goto out;
3143 }
3144 if (ops->disabled_by_bios()) {
3145 printk(KERN_ERR "kvm: disabled by bios\n");
3146 r = -EOPNOTSUPP;
3147 goto out;
3148 }
3149
3150 r = kvm_mmu_module_init();
3151 if (r)
3152 goto out;
3153
3154 kvm_init_msr_list();
3155
3156 kvm_x86_ops = ops;
3157 kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
3158 kvm_mmu_set_base_ptes(PT_PRESENT_MASK);
3159 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
3160 PT_DIRTY_MASK, PT64_NX_MASK, 0);
3161
3162 for_each_possible_cpu(cpu)
3163 per_cpu(cpu_tsc_khz, cpu) = tsc_khz;
3164 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
3165 tsc_khz_ref = tsc_khz;
3166 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
3167 CPUFREQ_TRANSITION_NOTIFIER);
3168 }
3169
3170 return 0;
3171
3172 out:
3173 return r;
3174 }
3175
3176 void kvm_arch_exit(void)
3177 {
3178 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
3179 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
3180 CPUFREQ_TRANSITION_NOTIFIER);
3181 kvm_x86_ops = NULL;
3182 kvm_mmu_module_exit();
3183 }
3184
3185 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
3186 {
3187 ++vcpu->stat.halt_exits;
3188 if (irqchip_in_kernel(vcpu->kvm)) {
3189 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
3190 return 1;
3191 } else {
3192 vcpu->run->exit_reason = KVM_EXIT_HLT;
3193 return 0;
3194 }
3195 }
3196 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
3197
3198 static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
3199 unsigned long a1)
3200 {
3201 if (is_long_mode(vcpu))
3202 return a0;
3203 else
3204 return a0 | ((gpa_t)a1 << 32);
3205 }
3206
3207 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
3208 {
3209 unsigned long nr, a0, a1, a2, a3, ret;
3210 int r = 1;
3211
3212 nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
3213 a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
3214 a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
3215 a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
3216 a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
3217
3218 trace_kvm_hypercall(nr, a0, a1, a2, a3);
3219
3220 if (!is_long_mode(vcpu)) {
3221 nr &= 0xFFFFFFFF;
3222 a0 &= 0xFFFFFFFF;
3223 a1 &= 0xFFFFFFFF;
3224 a2 &= 0xFFFFFFFF;
3225 a3 &= 0xFFFFFFFF;
3226 }
3227
3228 if (kvm_x86_ops->get_cpl(vcpu) != 0) {
3229 ret = -KVM_EPERM;
3230 goto out;
3231 }
3232
3233 switch (nr) {
3234 case KVM_HC_VAPIC_POLL_IRQ:
3235 ret = 0;
3236 break;
3237 case KVM_HC_MMU_OP:
3238 r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
3239 break;
3240 default:
3241 ret = -KVM_ENOSYS;
3242 break;
3243 }
3244 out:
3245 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
3246 ++vcpu->stat.hypercalls;
3247 return r;
3248 }
3249 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
3250
3251 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
3252 {
3253 char instruction[3];
3254 int ret = 0;
3255 unsigned long rip = kvm_rip_read(vcpu);
3256
3257
3258 /*
3259 * Blow out the MMU to ensure that no other VCPU has an active mapping
3260 * to ensure that the updated hypercall appears atomically across all
3261 * VCPUs.
3262 */
3263 kvm_mmu_zap_all(vcpu->kvm);
3264
3265 kvm_x86_ops->patch_hypercall(vcpu, instruction);
3266 if (emulator_write_emulated(rip, instruction, 3, vcpu)
3267 != X86EMUL_CONTINUE)
3268 ret = -EFAULT;
3269
3270 return ret;
3271 }
3272
3273 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
3274 {
3275 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
3276 }
3277
3278 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
3279 {
3280 struct descriptor_table dt = { limit, base };
3281
3282 kvm_x86_ops->set_gdt(vcpu, &dt);
3283 }
3284
3285 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
3286 {
3287 struct descriptor_table dt = { limit, base };
3288
3289 kvm_x86_ops->set_idt(vcpu, &dt);
3290 }
3291
3292 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
3293 unsigned long *rflags)
3294 {
3295 kvm_lmsw(vcpu, msw);
3296 *rflags = kvm_x86_ops->get_rflags(vcpu);
3297 }
3298
3299 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
3300 {
3301 unsigned long value;
3302
3303 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3304 switch (cr) {
3305 case 0:
3306 value = vcpu->arch.cr0;
3307 break;
3308 case 2:
3309 value = vcpu->arch.cr2;
3310 break;
3311 case 3:
3312 value = vcpu->arch.cr3;
3313 break;
3314 case 4:
3315 value = vcpu->arch.cr4;
3316 break;
3317 case 8:
3318 value = kvm_get_cr8(vcpu);
3319 break;
3320 default:
3321 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
3322 return 0;
3323 }
3324
3325 return value;
3326 }
3327
3328 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
3329 unsigned long *rflags)
3330 {
3331 switch (cr) {
3332 case 0:
3333 kvm_set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
3334 *rflags = kvm_x86_ops->get_rflags(vcpu);
3335 break;
3336 case 2:
3337 vcpu->arch.cr2 = val;
3338 break;
3339 case 3:
3340 kvm_set_cr3(vcpu, val);
3341 break;
3342 case 4:
3343 kvm_set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
3344 break;
3345 case 8:
3346 kvm_set_cr8(vcpu, val & 0xfUL);
3347 break;
3348 default:
3349 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
3350 }
3351 }
3352
3353 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
3354 {
3355 struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
3356 int j, nent = vcpu->arch.cpuid_nent;
3357
3358 e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
3359 /* when no next entry is found, the current entry[i] is reselected */
3360 for (j = i + 1; ; j = (j + 1) % nent) {
3361 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
3362 if (ej->function == e->function) {
3363 ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
3364 return j;
3365 }
3366 }
3367 return 0; /* silence gcc, even though control never reaches here */
3368 }
3369
3370 /* find an entry with matching function, matching index (if needed), and that
3371 * should be read next (if it's stateful) */
3372 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
3373 u32 function, u32 index)
3374 {
3375 if (e->function != function)
3376 return 0;
3377 if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
3378 return 0;
3379 if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
3380 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
3381 return 0;
3382 return 1;
3383 }
3384
3385 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
3386 u32 function, u32 index)
3387 {
3388 int i;
3389 struct kvm_cpuid_entry2 *best = NULL;
3390
3391 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
3392 struct kvm_cpuid_entry2 *e;
3393
3394 e = &vcpu->arch.cpuid_entries[i];
3395 if (is_matching_cpuid_entry(e, function, index)) {
3396 if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
3397 move_to_next_stateful_cpuid_entry(vcpu, i);
3398 best = e;
3399 break;
3400 }
3401 /*
3402 * Both basic or both extended?
3403 */
3404 if (((e->function ^ function) & 0x80000000) == 0)
3405 if (!best || e->function > best->function)
3406 best = e;
3407 }
3408 return best;
3409 }
3410
3411 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
3412 {
3413 struct kvm_cpuid_entry2 *best;
3414
3415 best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
3416 if (best)
3417 return best->eax & 0xff;
3418 return 36;
3419 }
3420
3421 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
3422 {
3423 u32 function, index;
3424 struct kvm_cpuid_entry2 *best;
3425
3426 function = kvm_register_read(vcpu, VCPU_REGS_RAX);
3427 index = kvm_register_read(vcpu, VCPU_REGS_RCX);
3428 kvm_register_write(vcpu, VCPU_REGS_RAX, 0);
3429 kvm_register_write(vcpu, VCPU_REGS_RBX, 0);
3430 kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
3431 kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
3432 best = kvm_find_cpuid_entry(vcpu, function, index);
3433 if (best) {
3434 kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
3435 kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
3436 kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx);
3437 kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx);
3438 }
3439 kvm_x86_ops->skip_emulated_instruction(vcpu);
3440 trace_kvm_cpuid(function,
3441 kvm_register_read(vcpu, VCPU_REGS_RAX),
3442 kvm_register_read(vcpu, VCPU_REGS_RBX),
3443 kvm_register_read(vcpu, VCPU_REGS_RCX),
3444 kvm_register_read(vcpu, VCPU_REGS_RDX));
3445 }
3446 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
3447
3448 /*
3449 * Check if userspace requested an interrupt window, and that the
3450 * interrupt window is open.
3451 *
3452 * No need to exit to userspace if we already have an interrupt queued.
3453 */
3454 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
3455 struct kvm_run *kvm_run)
3456 {
3457 return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
3458 kvm_run->request_interrupt_window &&
3459 kvm_arch_interrupt_allowed(vcpu));
3460 }
3461
3462 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
3463 struct kvm_run *kvm_run)
3464 {
3465 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
3466 kvm_run->cr8 = kvm_get_cr8(vcpu);
3467 kvm_run->apic_base = kvm_get_apic_base(vcpu);
3468 if (irqchip_in_kernel(vcpu->kvm))
3469 kvm_run->ready_for_interrupt_injection = 1;
3470 else
3471 kvm_run->ready_for_interrupt_injection =
3472 kvm_arch_interrupt_allowed(vcpu) &&
3473 !kvm_cpu_has_interrupt(vcpu) &&
3474 !kvm_event_needs_reinjection(vcpu);
3475 }
3476
3477 static void vapic_enter(struct kvm_vcpu *vcpu)
3478 {
3479 struct kvm_lapic *apic = vcpu->arch.apic;
3480 struct page *page;
3481
3482 if (!apic || !apic->vapic_addr)
3483 return;
3484
3485 page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
3486
3487 vcpu->arch.apic->vapic_page = page;
3488 }
3489
3490 static void vapic_exit(struct kvm_vcpu *vcpu)
3491 {
3492 struct kvm_lapic *apic = vcpu->arch.apic;
3493
3494 if (!apic || !apic->vapic_addr)
3495 return;
3496
3497 down_read(&vcpu->kvm->slots_lock);
3498 kvm_release_page_dirty(apic->vapic_page);
3499 mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
3500 up_read(&vcpu->kvm->slots_lock);
3501 }
3502
3503 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
3504 {
3505 int max_irr, tpr;
3506
3507 if (!kvm_x86_ops->update_cr8_intercept)
3508 return;
3509
3510 if (!vcpu->arch.apic)
3511 return;
3512
3513 if (!vcpu->arch.apic->vapic_addr)
3514 max_irr = kvm_lapic_find_highest_irr(vcpu);
3515 else
3516 max_irr = -1;
3517
3518 if (max_irr != -1)
3519 max_irr >>= 4;
3520
3521 tpr = kvm_lapic_get_cr8(vcpu);
3522
3523 kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
3524 }
3525
3526 static void inject_pending_event(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3527 {
3528 /* try to reinject previous events if any */
3529 if (vcpu->arch.exception.pending) {
3530 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
3531 vcpu->arch.exception.has_error_code,
3532 vcpu->arch.exception.error_code);
3533 return;
3534 }
3535
3536 if (vcpu->arch.nmi_injected) {
3537 kvm_x86_ops->set_nmi(vcpu);
3538 return;
3539 }
3540
3541 if (vcpu->arch.interrupt.pending) {
3542 kvm_x86_ops->set_irq(vcpu);
3543 return;
3544 }
3545
3546 /* try to inject new event if pending */
3547 if (vcpu->arch.nmi_pending) {
3548 if (kvm_x86_ops->nmi_allowed(vcpu)) {
3549 vcpu->arch.nmi_pending = false;
3550 vcpu->arch.nmi_injected = true;
3551 kvm_x86_ops->set_nmi(vcpu);
3552 }
3553 } else if (kvm_cpu_has_interrupt(vcpu)) {
3554 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
3555 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
3556 false);
3557 kvm_x86_ops->set_irq(vcpu);
3558 }
3559 }
3560 }
3561
3562 static int vcpu_enter_guest(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3563 {
3564 int r;
3565 bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
3566 kvm_run->request_interrupt_window;
3567
3568 if (vcpu->requests)
3569 if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
3570 kvm_mmu_unload(vcpu);
3571
3572 r = kvm_mmu_reload(vcpu);
3573 if (unlikely(r))
3574 goto out;
3575
3576 if (vcpu->requests) {
3577 if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
3578 __kvm_migrate_timers(vcpu);
3579 if (test_and_clear_bit(KVM_REQ_KVMCLOCK_UPDATE, &vcpu->requests))
3580 kvm_write_guest_time(vcpu);
3581 if (test_and_clear_bit(KVM_REQ_MMU_SYNC, &vcpu->requests))
3582 kvm_mmu_sync_roots(vcpu);
3583 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
3584 kvm_x86_ops->tlb_flush(vcpu);
3585 if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
3586 &vcpu->requests)) {
3587 kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS;
3588 r = 0;
3589 goto out;
3590 }
3591 if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) {
3592 kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
3593 r = 0;
3594 goto out;
3595 }
3596 }
3597
3598 preempt_disable();
3599
3600 kvm_x86_ops->prepare_guest_switch(vcpu);
3601 kvm_load_guest_fpu(vcpu);
3602
3603 local_irq_disable();
3604
3605 clear_bit(KVM_REQ_KICK, &vcpu->requests);
3606 smp_mb__after_clear_bit();
3607
3608 if (vcpu->requests || need_resched() || signal_pending(current)) {
3609 set_bit(KVM_REQ_KICK, &vcpu->requests);
3610 local_irq_enable();
3611 preempt_enable();
3612 r = 1;
3613 goto out;
3614 }
3615
3616 inject_pending_event(vcpu, kvm_run);
3617
3618 /* enable NMI/IRQ window open exits if needed */
3619 if (vcpu->arch.nmi_pending)
3620 kvm_x86_ops->enable_nmi_window(vcpu);
3621 else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
3622 kvm_x86_ops->enable_irq_window(vcpu);
3623
3624 if (kvm_lapic_enabled(vcpu)) {
3625 update_cr8_intercept(vcpu);
3626 kvm_lapic_sync_to_vapic(vcpu);
3627 }
3628
3629 up_read(&vcpu->kvm->slots_lock);
3630
3631 kvm_guest_enter();
3632
3633 if (unlikely(vcpu->arch.switch_db_regs)) {
3634 set_debugreg(0, 7);
3635 set_debugreg(vcpu->arch.eff_db[0], 0);
3636 set_debugreg(vcpu->arch.eff_db[1], 1);
3637 set_debugreg(vcpu->arch.eff_db[2], 2);
3638 set_debugreg(vcpu->arch.eff_db[3], 3);
3639 }
3640
3641 trace_kvm_entry(vcpu->vcpu_id);
3642 kvm_x86_ops->run(vcpu, kvm_run);
3643
3644 if (unlikely(vcpu->arch.switch_db_regs || test_thread_flag(TIF_DEBUG))) {
3645 set_debugreg(current->thread.debugreg0, 0);
3646 set_debugreg(current->thread.debugreg1, 1);
3647 set_debugreg(current->thread.debugreg2, 2);
3648 set_debugreg(current->thread.debugreg3, 3);
3649 set_debugreg(current->thread.debugreg6, 6);
3650 set_debugreg(current->thread.debugreg7, 7);
3651 }
3652
3653 set_bit(KVM_REQ_KICK, &vcpu->requests);
3654 local_irq_enable();
3655
3656 ++vcpu->stat.exits;
3657
3658 /*
3659 * We must have an instruction between local_irq_enable() and
3660 * kvm_guest_exit(), so the timer interrupt isn't delayed by
3661 * the interrupt shadow. The stat.exits increment will do nicely.
3662 * But we need to prevent reordering, hence this barrier():
3663 */
3664 barrier();
3665
3666 kvm_guest_exit();
3667
3668 preempt_enable();
3669
3670 down_read(&vcpu->kvm->slots_lock);
3671
3672 /*
3673 * Profile KVM exit RIPs:
3674 */
3675 if (unlikely(prof_on == KVM_PROFILING)) {
3676 unsigned long rip = kvm_rip_read(vcpu);
3677 profile_hit(KVM_PROFILING, (void *)rip);
3678 }
3679
3680
3681 kvm_lapic_sync_from_vapic(vcpu);
3682
3683 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
3684 out:
3685 return r;
3686 }
3687
3688
3689 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3690 {
3691 int r;
3692
3693 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
3694 pr_debug("vcpu %d received sipi with vector # %x\n",
3695 vcpu->vcpu_id, vcpu->arch.sipi_vector);
3696 kvm_lapic_reset(vcpu);
3697 r = kvm_arch_vcpu_reset(vcpu);
3698 if (r)
3699 return r;
3700 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
3701 }
3702
3703 down_read(&vcpu->kvm->slots_lock);
3704 vapic_enter(vcpu);
3705
3706 r = 1;
3707 while (r > 0) {
3708 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
3709 r = vcpu_enter_guest(vcpu, kvm_run);
3710 else {
3711 up_read(&vcpu->kvm->slots_lock);
3712 kvm_vcpu_block(vcpu);
3713 down_read(&vcpu->kvm->slots_lock);
3714 if (test_and_clear_bit(KVM_REQ_UNHALT, &vcpu->requests))
3715 {
3716 switch(vcpu->arch.mp_state) {
3717 case KVM_MP_STATE_HALTED:
3718 vcpu->arch.mp_state =
3719 KVM_MP_STATE_RUNNABLE;
3720 case KVM_MP_STATE_RUNNABLE:
3721 break;
3722 case KVM_MP_STATE_SIPI_RECEIVED:
3723 default:
3724 r = -EINTR;
3725 break;
3726 }
3727 }
3728 }
3729
3730 if (r <= 0)
3731 break;
3732
3733 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
3734 if (kvm_cpu_has_pending_timer(vcpu))
3735 kvm_inject_pending_timer_irqs(vcpu);
3736
3737 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
3738 r = -EINTR;
3739 kvm_run->exit_reason = KVM_EXIT_INTR;
3740 ++vcpu->stat.request_irq_exits;
3741 }
3742 if (signal_pending(current)) {
3743 r = -EINTR;
3744 kvm_run->exit_reason = KVM_EXIT_INTR;
3745 ++vcpu->stat.signal_exits;
3746 }
3747 if (need_resched()) {
3748 up_read(&vcpu->kvm->slots_lock);
3749 kvm_resched(vcpu);
3750 down_read(&vcpu->kvm->slots_lock);
3751 }
3752 }
3753
3754 up_read(&vcpu->kvm->slots_lock);
3755 post_kvm_run_save(vcpu, kvm_run);
3756
3757 vapic_exit(vcpu);
3758
3759 return r;
3760 }
3761
3762 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3763 {
3764 int r;
3765 sigset_t sigsaved;
3766
3767 vcpu_load(vcpu);
3768
3769 if (vcpu->sigset_active)
3770 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
3771
3772 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
3773 kvm_vcpu_block(vcpu);
3774 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
3775 r = -EAGAIN;
3776 goto out;
3777 }
3778
3779 /* re-sync apic's tpr */
3780 if (!irqchip_in_kernel(vcpu->kvm))
3781 kvm_set_cr8(vcpu, kvm_run->cr8);
3782
3783 if (vcpu->arch.pio.cur_count) {
3784 r = complete_pio(vcpu);
3785 if (r)
3786 goto out;
3787 }
3788 #if CONFIG_HAS_IOMEM
3789 if (vcpu->mmio_needed) {
3790 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
3791 vcpu->mmio_read_completed = 1;
3792 vcpu->mmio_needed = 0;
3793
3794 down_read(&vcpu->kvm->slots_lock);
3795 r = emulate_instruction(vcpu, kvm_run,
3796 vcpu->arch.mmio_fault_cr2, 0,
3797 EMULTYPE_NO_DECODE);
3798 up_read(&vcpu->kvm->slots_lock);
3799 if (r == EMULATE_DO_MMIO) {
3800 /*
3801 * Read-modify-write. Back to userspace.
3802 */
3803 r = 0;
3804 goto out;
3805 }
3806 }
3807 #endif
3808 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL)
3809 kvm_register_write(vcpu, VCPU_REGS_RAX,
3810 kvm_run->hypercall.ret);
3811
3812 r = __vcpu_run(vcpu, kvm_run);
3813
3814 out:
3815 if (vcpu->sigset_active)
3816 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
3817
3818 vcpu_put(vcpu);
3819 return r;
3820 }
3821
3822 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3823 {
3824 vcpu_load(vcpu);
3825
3826 regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
3827 regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
3828 regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
3829 regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
3830 regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
3831 regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
3832 regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
3833 regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
3834 #ifdef CONFIG_X86_64
3835 regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
3836 regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
3837 regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
3838 regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
3839 regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
3840 regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
3841 regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
3842 regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
3843 #endif
3844
3845 regs->rip = kvm_rip_read(vcpu);
3846 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
3847
3848 /*
3849 * Don't leak debug flags in case they were set for guest debugging
3850 */
3851 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
3852 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
3853
3854 vcpu_put(vcpu);
3855
3856 return 0;
3857 }
3858
3859 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3860 {
3861 vcpu_load(vcpu);
3862
3863 kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
3864 kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
3865 kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
3866 kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
3867 kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
3868 kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
3869 kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
3870 kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
3871 #ifdef CONFIG_X86_64
3872 kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
3873 kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
3874 kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
3875 kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
3876 kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
3877 kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
3878 kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
3879 kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
3880
3881 #endif
3882
3883 kvm_rip_write(vcpu, regs->rip);
3884 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
3885
3886
3887 vcpu->arch.exception.pending = false;
3888
3889 vcpu_put(vcpu);
3890
3891 return 0;
3892 }
3893
3894 void kvm_get_segment(struct kvm_vcpu *vcpu,
3895 struct kvm_segment *var, int seg)
3896 {
3897 kvm_x86_ops->get_segment(vcpu, var, seg);
3898 }
3899
3900 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
3901 {
3902 struct kvm_segment cs;
3903
3904 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
3905 *db = cs.db;
3906 *l = cs.l;
3907 }
3908 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
3909
3910 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
3911 struct kvm_sregs *sregs)
3912 {
3913 struct descriptor_table dt;
3914
3915 vcpu_load(vcpu);
3916
3917 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3918 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3919 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3920 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3921 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3922 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3923
3924 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3925 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3926
3927 kvm_x86_ops->get_idt(vcpu, &dt);
3928 sregs->idt.limit = dt.limit;
3929 sregs->idt.base = dt.base;
3930 kvm_x86_ops->get_gdt(vcpu, &dt);
3931 sregs->gdt.limit = dt.limit;
3932 sregs->gdt.base = dt.base;
3933
3934 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3935 sregs->cr0 = vcpu->arch.cr0;
3936 sregs->cr2 = vcpu->arch.cr2;
3937 sregs->cr3 = vcpu->arch.cr3;
3938 sregs->cr4 = vcpu->arch.cr4;
3939 sregs->cr8 = kvm_get_cr8(vcpu);
3940 sregs->efer = vcpu->arch.shadow_efer;
3941 sregs->apic_base = kvm_get_apic_base(vcpu);
3942
3943 memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
3944
3945 if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
3946 set_bit(vcpu->arch.interrupt.nr,
3947 (unsigned long *)sregs->interrupt_bitmap);
3948
3949 vcpu_put(vcpu);
3950
3951 return 0;
3952 }
3953
3954 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
3955 struct kvm_mp_state *mp_state)
3956 {
3957 vcpu_load(vcpu);
3958 mp_state->mp_state = vcpu->arch.mp_state;
3959 vcpu_put(vcpu);
3960 return 0;
3961 }
3962
3963 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
3964 struct kvm_mp_state *mp_state)
3965 {
3966 vcpu_load(vcpu);
3967 vcpu->arch.mp_state = mp_state->mp_state;
3968 vcpu_put(vcpu);
3969 return 0;
3970 }
3971
3972 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3973 struct kvm_segment *var, int seg)
3974 {
3975 kvm_x86_ops->set_segment(vcpu, var, seg);
3976 }
3977
3978 static void seg_desct_to_kvm_desct(struct desc_struct *seg_desc, u16 selector,
3979 struct kvm_segment *kvm_desct)
3980 {
3981 kvm_desct->base = get_desc_base(seg_desc);
3982 kvm_desct->limit = get_desc_limit(seg_desc);
3983 if (seg_desc->g) {
3984 kvm_desct->limit <<= 12;
3985 kvm_desct->limit |= 0xfff;
3986 }
3987 kvm_desct->selector = selector;
3988 kvm_desct->type = seg_desc->type;
3989 kvm_desct->present = seg_desc->p;
3990 kvm_desct->dpl = seg_desc->dpl;
3991 kvm_desct->db = seg_desc->d;
3992 kvm_desct->s = seg_desc->s;
3993 kvm_desct->l = seg_desc->l;
3994 kvm_desct->g = seg_desc->g;
3995 kvm_desct->avl = seg_desc->avl;
3996 if (!selector)
3997 kvm_desct->unusable = 1;
3998 else
3999 kvm_desct->unusable = 0;
4000 kvm_desct->padding = 0;
4001 }
4002
4003 static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu,
4004 u16 selector,
4005 struct descriptor_table *dtable)
4006 {
4007 if (selector & 1 << 2) {
4008 struct kvm_segment kvm_seg;
4009
4010 kvm_get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR);
4011
4012 if (kvm_seg.unusable)
4013 dtable->limit = 0;
4014 else
4015 dtable->limit = kvm_seg.limit;
4016 dtable->base = kvm_seg.base;
4017 }
4018 else
4019 kvm_x86_ops->get_gdt(vcpu, dtable);
4020 }
4021
4022 /* allowed just for 8 bytes segments */
4023 static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
4024 struct desc_struct *seg_desc)
4025 {
4026 struct descriptor_table dtable;
4027 u16 index = selector >> 3;
4028
4029 get_segment_descriptor_dtable(vcpu, selector, &dtable);
4030
4031 if (dtable.limit < index * 8 + 7) {
4032 kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
4033 return 1;
4034 }
4035 return kvm_read_guest_virt(dtable.base + index*8, seg_desc, sizeof(*seg_desc), vcpu);
4036 }
4037
4038 /* allowed just for 8 bytes segments */
4039 static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
4040 struct desc_struct *seg_desc)
4041 {
4042 struct descriptor_table dtable;
4043 u16 index = selector >> 3;
4044
4045 get_segment_descriptor_dtable(vcpu, selector, &dtable);
4046
4047 if (dtable.limit < index * 8 + 7)
4048 return 1;
4049 return kvm_write_guest_virt(dtable.base + index*8, seg_desc, sizeof(*seg_desc), vcpu);
4050 }
4051
4052 static u32 get_tss_base_addr(struct kvm_vcpu *vcpu,
4053 struct desc_struct *seg_desc)
4054 {
4055 u32 base_addr = get_desc_base(seg_desc);
4056
4057 return vcpu->arch.mmu.gva_to_gpa(vcpu, base_addr);
4058 }
4059
4060 static u16 get_segment_selector(struct kvm_vcpu *vcpu, int seg)
4061 {
4062 struct kvm_segment kvm_seg;
4063
4064 kvm_get_segment(vcpu, &kvm_seg, seg);
4065 return kvm_seg.selector;
4066 }
4067
4068 static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu,
4069 u16 selector,
4070 struct kvm_segment *kvm_seg)
4071 {
4072 struct desc_struct seg_desc;
4073
4074 if (load_guest_segment_descriptor(vcpu, selector, &seg_desc))
4075 return 1;
4076 seg_desct_to_kvm_desct(&seg_desc, selector, kvm_seg);
4077 return 0;
4078 }
4079
4080 static int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg)
4081 {
4082 struct kvm_segment segvar = {
4083 .base = selector << 4,
4084 .limit = 0xffff,
4085 .selector = selector,
4086 .type = 3,
4087 .present = 1,
4088 .dpl = 3,
4089 .db = 0,
4090 .s = 1,
4091 .l = 0,
4092 .g = 0,
4093 .avl = 0,
4094 .unusable = 0,
4095 };
4096 kvm_x86_ops->set_segment(vcpu, &segvar, seg);
4097 return 0;
4098 }
4099
4100 static int is_vm86_segment(struct kvm_vcpu *vcpu, int seg)
4101 {
4102 return (seg != VCPU_SREG_LDTR) &&
4103 (seg != VCPU_SREG_TR) &&
4104 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_VM);
4105 }
4106
4107 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
4108 int type_bits, int seg)
4109 {
4110 struct kvm_segment kvm_seg;
4111
4112 if (is_vm86_segment(vcpu, seg) || !(vcpu->arch.cr0 & X86_CR0_PE))
4113 return kvm_load_realmode_segment(vcpu, selector, seg);
4114 if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg))
4115 return 1;
4116 kvm_seg.type |= type_bits;
4117
4118 if (seg != VCPU_SREG_SS && seg != VCPU_SREG_CS &&
4119 seg != VCPU_SREG_LDTR)
4120 if (!kvm_seg.s)
4121 kvm_seg.unusable = 1;
4122
4123 kvm_set_segment(vcpu, &kvm_seg, seg);
4124 return 0;
4125 }
4126
4127 static void save_state_to_tss32(struct kvm_vcpu *vcpu,
4128 struct tss_segment_32 *tss)
4129 {
4130 tss->cr3 = vcpu->arch.cr3;
4131 tss->eip = kvm_rip_read(vcpu);
4132 tss->eflags = kvm_x86_ops->get_rflags(vcpu);
4133 tss->eax = kvm_register_read(vcpu, VCPU_REGS_RAX);
4134 tss->ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
4135 tss->edx = kvm_register_read(vcpu, VCPU_REGS_RDX);
4136 tss->ebx = kvm_register_read(vcpu, VCPU_REGS_RBX);
4137 tss->esp = kvm_register_read(vcpu, VCPU_REGS_RSP);
4138 tss->ebp = kvm_register_read(vcpu, VCPU_REGS_RBP);
4139 tss->esi = kvm_register_read(vcpu, VCPU_REGS_RSI);
4140 tss->edi = kvm_register_read(vcpu, VCPU_REGS_RDI);
4141 tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
4142 tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
4143 tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
4144 tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
4145 tss->fs = get_segment_selector(vcpu, VCPU_SREG_FS);
4146 tss->gs = get_segment_selector(vcpu, VCPU_SREG_GS);
4147 tss->ldt_selector = get_segment_selector(vcpu, VCPU_SREG_LDTR);
4148 }
4149
4150 static int load_state_from_tss32(struct kvm_vcpu *vcpu,
4151 struct tss_segment_32 *tss)
4152 {
4153 kvm_set_cr3(vcpu, tss->cr3);
4154
4155 kvm_rip_write(vcpu, tss->eip);
4156 kvm_x86_ops->set_rflags(vcpu, tss->eflags | 2);
4157
4158 kvm_register_write(vcpu, VCPU_REGS_RAX, tss->eax);
4159 kvm_register_write(vcpu, VCPU_REGS_RCX, tss->ecx);
4160 kvm_register_write(vcpu, VCPU_REGS_RDX, tss->edx);
4161 kvm_register_write(vcpu, VCPU_REGS_RBX, tss->ebx);
4162 kvm_register_write(vcpu, VCPU_REGS_RSP, tss->esp);
4163 kvm_register_write(vcpu, VCPU_REGS_RBP, tss->ebp);
4164 kvm_register_write(vcpu, VCPU_REGS_RSI, tss->esi);
4165 kvm_register_write(vcpu, VCPU_REGS_RDI, tss->edi);
4166
4167 if (kvm_load_segment_descriptor(vcpu, tss->ldt_selector, 0, VCPU_SREG_LDTR))
4168 return 1;
4169
4170 if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
4171 return 1;
4172
4173 if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
4174 return 1;
4175
4176 if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
4177 return 1;
4178
4179 if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
4180 return 1;
4181
4182 if (kvm_load_segment_descriptor(vcpu, tss->fs, 1, VCPU_SREG_FS))
4183 return 1;
4184
4185 if (kvm_load_segment_descriptor(vcpu, tss->gs, 1, VCPU_SREG_GS))
4186 return 1;
4187 return 0;
4188 }
4189
4190 static void save_state_to_tss16(struct kvm_vcpu *vcpu,
4191 struct tss_segment_16 *tss)
4192 {
4193 tss->ip = kvm_rip_read(vcpu);
4194 tss->flag = kvm_x86_ops->get_rflags(vcpu);
4195 tss->ax = kvm_register_read(vcpu, VCPU_REGS_RAX);
4196 tss->cx = kvm_register_read(vcpu, VCPU_REGS_RCX);
4197 tss->dx = kvm_register_read(vcpu, VCPU_REGS_RDX);
4198 tss->bx = kvm_register_read(vcpu, VCPU_REGS_RBX);
4199 tss->sp = kvm_register_read(vcpu, VCPU_REGS_RSP);
4200 tss->bp = kvm_register_read(vcpu, VCPU_REGS_RBP);
4201 tss->si = kvm_register_read(vcpu, VCPU_REGS_RSI);
4202 tss->di = kvm_register_read(vcpu, VCPU_REGS_RDI);
4203
4204 tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
4205 tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
4206 tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
4207 tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
4208 tss->ldt = get_segment_selector(vcpu, VCPU_SREG_LDTR);
4209 tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
4210 }
4211
4212 static int load_state_from_tss16(struct kvm_vcpu *vcpu,
4213 struct tss_segment_16 *tss)
4214 {
4215 kvm_rip_write(vcpu, tss->ip);
4216 kvm_x86_ops->set_rflags(vcpu, tss->flag | 2);
4217 kvm_register_write(vcpu, VCPU_REGS_RAX, tss->ax);
4218 kvm_register_write(vcpu, VCPU_REGS_RCX, tss->cx);
4219 kvm_register_write(vcpu, VCPU_REGS_RDX, tss->dx);
4220 kvm_register_write(vcpu, VCPU_REGS_RBX, tss->bx);
4221 kvm_register_write(vcpu, VCPU_REGS_RSP, tss->sp);
4222 kvm_register_write(vcpu, VCPU_REGS_RBP, tss->bp);
4223 kvm_register_write(vcpu, VCPU_REGS_RSI, tss->si);
4224 kvm_register_write(vcpu, VCPU_REGS_RDI, tss->di);
4225
4226 if (kvm_load_segment_descriptor(vcpu, tss->ldt, 0, VCPU_SREG_LDTR))
4227 return 1;
4228
4229 if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
4230 return 1;
4231
4232 if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
4233 return 1;
4234
4235 if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
4236 return 1;
4237
4238 if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
4239 return 1;
4240 return 0;
4241 }
4242
4243 static int kvm_task_switch_16(struct kvm_vcpu *vcpu, u16 tss_selector,
4244 u16 old_tss_sel, u32 old_tss_base,
4245 struct desc_struct *nseg_desc)
4246 {
4247 struct tss_segment_16 tss_segment_16;
4248 int ret = 0;
4249
4250 if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
4251 sizeof tss_segment_16))
4252 goto out;
4253
4254 save_state_to_tss16(vcpu, &tss_segment_16);
4255
4256 if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
4257 sizeof tss_segment_16))
4258 goto out;
4259
4260 if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
4261 &tss_segment_16, sizeof tss_segment_16))
4262 goto out;
4263
4264 if (old_tss_sel != 0xffff) {
4265 tss_segment_16.prev_task_link = old_tss_sel;
4266
4267 if (kvm_write_guest(vcpu->kvm,
4268 get_tss_base_addr(vcpu, nseg_desc),
4269 &tss_segment_16.prev_task_link,
4270 sizeof tss_segment_16.prev_task_link))
4271 goto out;
4272 }
4273
4274 if (load_state_from_tss16(vcpu, &tss_segment_16))
4275 goto out;
4276
4277 ret = 1;
4278 out:
4279 return ret;
4280 }
4281
4282 static int kvm_task_switch_32(struct kvm_vcpu *vcpu, u16 tss_selector,
4283 u16 old_tss_sel, u32 old_tss_base,
4284 struct desc_struct *nseg_desc)
4285 {
4286 struct tss_segment_32 tss_segment_32;
4287 int ret = 0;
4288
4289 if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
4290 sizeof tss_segment_32))
4291 goto out;
4292
4293 save_state_to_tss32(vcpu, &tss_segment_32);
4294
4295 if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
4296 sizeof tss_segment_32))
4297 goto out;
4298
4299 if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
4300 &tss_segment_32, sizeof tss_segment_32))
4301 goto out;
4302
4303 if (old_tss_sel != 0xffff) {
4304 tss_segment_32.prev_task_link = old_tss_sel;
4305
4306 if (kvm_write_guest(vcpu->kvm,
4307 get_tss_base_addr(vcpu, nseg_desc),
4308 &tss_segment_32.prev_task_link,
4309 sizeof tss_segment_32.prev_task_link))
4310 goto out;
4311 }
4312
4313 if (load_state_from_tss32(vcpu, &tss_segment_32))
4314 goto out;
4315
4316 ret = 1;
4317 out:
4318 return ret;
4319 }
4320
4321 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
4322 {
4323 struct kvm_segment tr_seg;
4324 struct desc_struct cseg_desc;
4325 struct desc_struct nseg_desc;
4326 int ret = 0;
4327 u32 old_tss_base = get_segment_base(vcpu, VCPU_SREG_TR);
4328 u16 old_tss_sel = get_segment_selector(vcpu, VCPU_SREG_TR);
4329
4330 old_tss_base = vcpu->arch.mmu.gva_to_gpa(vcpu, old_tss_base);
4331
4332 /* FIXME: Handle errors. Failure to read either TSS or their
4333 * descriptors should generate a pagefault.
4334 */
4335 if (load_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc))
4336 goto out;
4337
4338 if (load_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc))
4339 goto out;
4340
4341 if (reason != TASK_SWITCH_IRET) {
4342 int cpl;
4343
4344 cpl = kvm_x86_ops->get_cpl(vcpu);
4345 if ((tss_selector & 3) > nseg_desc.dpl || cpl > nseg_desc.dpl) {
4346 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
4347 return 1;
4348 }
4349 }
4350
4351 if (!nseg_desc.p || get_desc_limit(&nseg_desc) < 0x67) {
4352 kvm_queue_exception_e(vcpu, TS_VECTOR, tss_selector & 0xfffc);
4353 return 1;
4354 }
4355
4356 if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
4357 cseg_desc.type &= ~(1 << 1); //clear the B flag
4358 save_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc);
4359 }
4360
4361 if (reason == TASK_SWITCH_IRET) {
4362 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
4363 kvm_x86_ops->set_rflags(vcpu, eflags & ~X86_EFLAGS_NT);
4364 }
4365
4366 /* set back link to prev task only if NT bit is set in eflags
4367 note that old_tss_sel is not used afetr this point */
4368 if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
4369 old_tss_sel = 0xffff;
4370
4371 /* set back link to prev task only if NT bit is set in eflags
4372 note that old_tss_sel is not used afetr this point */
4373 if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
4374 old_tss_sel = 0xffff;
4375
4376 if (nseg_desc.type & 8)
4377 ret = kvm_task_switch_32(vcpu, tss_selector, old_tss_sel,
4378 old_tss_base, &nseg_desc);
4379 else
4380 ret = kvm_task_switch_16(vcpu, tss_selector, old_tss_sel,
4381 old_tss_base, &nseg_desc);
4382
4383 if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) {
4384 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
4385 kvm_x86_ops->set_rflags(vcpu, eflags | X86_EFLAGS_NT);
4386 }
4387
4388 if (reason != TASK_SWITCH_IRET) {
4389 nseg_desc.type |= (1 << 1);
4390 save_guest_segment_descriptor(vcpu, tss_selector,
4391 &nseg_desc);
4392 }
4393
4394 kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 | X86_CR0_TS);
4395 seg_desct_to_kvm_desct(&nseg_desc, tss_selector, &tr_seg);
4396 tr_seg.type = 11;
4397 kvm_set_segment(vcpu, &tr_seg, VCPU_SREG_TR);
4398 out:
4399 return ret;
4400 }
4401 EXPORT_SYMBOL_GPL(kvm_task_switch);
4402
4403 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
4404 struct kvm_sregs *sregs)
4405 {
4406 int mmu_reset_needed = 0;
4407 int pending_vec, max_bits;
4408 struct descriptor_table dt;
4409
4410 vcpu_load(vcpu);
4411
4412 dt.limit = sregs->idt.limit;
4413 dt.base = sregs->idt.base;
4414 kvm_x86_ops->set_idt(vcpu, &dt);
4415 dt.limit = sregs->gdt.limit;
4416 dt.base = sregs->gdt.base;
4417 kvm_x86_ops->set_gdt(vcpu, &dt);
4418
4419 vcpu->arch.cr2 = sregs->cr2;
4420 mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
4421 vcpu->arch.cr3 = sregs->cr3;
4422
4423 kvm_set_cr8(vcpu, sregs->cr8);
4424
4425 mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
4426 kvm_x86_ops->set_efer(vcpu, sregs->efer);
4427 kvm_set_apic_base(vcpu, sregs->apic_base);
4428
4429 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
4430
4431 mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
4432 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
4433 vcpu->arch.cr0 = sregs->cr0;
4434
4435 mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
4436 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
4437 if (!is_long_mode(vcpu) && is_pae(vcpu))
4438 load_pdptrs(vcpu, vcpu->arch.cr3);
4439
4440 if (mmu_reset_needed)
4441 kvm_mmu_reset_context(vcpu);
4442
4443 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
4444 pending_vec = find_first_bit(
4445 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
4446 if (pending_vec < max_bits) {
4447 kvm_queue_interrupt(vcpu, pending_vec, false);
4448 pr_debug("Set back pending irq %d\n", pending_vec);
4449 if (irqchip_in_kernel(vcpu->kvm))
4450 kvm_pic_clear_isr_ack(vcpu->kvm);
4451 }
4452
4453 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
4454 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
4455 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
4456 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
4457 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
4458 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
4459
4460 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
4461 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
4462
4463 update_cr8_intercept(vcpu);
4464
4465 /* Older userspace won't unhalt the vcpu on reset. */
4466 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
4467 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
4468 !(vcpu->arch.cr0 & X86_CR0_PE))
4469 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4470
4471 vcpu_put(vcpu);
4472
4473 return 0;
4474 }
4475
4476 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
4477 struct kvm_guest_debug *dbg)
4478 {
4479 int i, r;
4480
4481 vcpu_load(vcpu);
4482
4483 if ((dbg->control & (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP)) ==
4484 (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP)) {
4485 for (i = 0; i < KVM_NR_DB_REGS; ++i)
4486 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
4487 vcpu->arch.switch_db_regs =
4488 (dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
4489 } else {
4490 for (i = 0; i < KVM_NR_DB_REGS; i++)
4491 vcpu->arch.eff_db[i] = vcpu->arch.db[i];
4492 vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
4493 }
4494
4495 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
4496
4497 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
4498 kvm_queue_exception(vcpu, DB_VECTOR);
4499 else if (dbg->control & KVM_GUESTDBG_INJECT_BP)
4500 kvm_queue_exception(vcpu, BP_VECTOR);
4501
4502 vcpu_put(vcpu);
4503
4504 return r;
4505 }
4506
4507 /*
4508 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
4509 * we have asm/x86/processor.h
4510 */
4511 struct fxsave {
4512 u16 cwd;
4513 u16 swd;
4514 u16 twd;
4515 u16 fop;
4516 u64 rip;
4517 u64 rdp;
4518 u32 mxcsr;
4519 u32 mxcsr_mask;
4520 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
4521 #ifdef CONFIG_X86_64
4522 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
4523 #else
4524 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
4525 #endif
4526 };
4527
4528 /*
4529 * Translate a guest virtual address to a guest physical address.
4530 */
4531 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
4532 struct kvm_translation *tr)
4533 {
4534 unsigned long vaddr = tr->linear_address;
4535 gpa_t gpa;
4536
4537 vcpu_load(vcpu);
4538 down_read(&vcpu->kvm->slots_lock);
4539 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
4540 up_read(&vcpu->kvm->slots_lock);
4541 tr->physical_address = gpa;
4542 tr->valid = gpa != UNMAPPED_GVA;
4543 tr->writeable = 1;
4544 tr->usermode = 0;
4545 vcpu_put(vcpu);
4546
4547 return 0;
4548 }
4549
4550 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4551 {
4552 struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
4553
4554 vcpu_load(vcpu);
4555
4556 memcpy(fpu->fpr, fxsave->st_space, 128);
4557 fpu->fcw = fxsave->cwd;
4558 fpu->fsw = fxsave->swd;
4559 fpu->ftwx = fxsave->twd;
4560 fpu->last_opcode = fxsave->fop;
4561 fpu->last_ip = fxsave->rip;
4562 fpu->last_dp = fxsave->rdp;
4563 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
4564
4565 vcpu_put(vcpu);
4566
4567 return 0;
4568 }
4569
4570 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4571 {
4572 struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
4573
4574 vcpu_load(vcpu);
4575
4576 memcpy(fxsave->st_space, fpu->fpr, 128);
4577 fxsave->cwd = fpu->fcw;
4578 fxsave->swd = fpu->fsw;
4579 fxsave->twd = fpu->ftwx;
4580 fxsave->fop = fpu->last_opcode;
4581 fxsave->rip = fpu->last_ip;
4582 fxsave->rdp = fpu->last_dp;
4583 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
4584
4585 vcpu_put(vcpu);
4586
4587 return 0;
4588 }
4589
4590 void fx_init(struct kvm_vcpu *vcpu)
4591 {
4592 unsigned after_mxcsr_mask;
4593
4594 /*
4595 * Touch the fpu the first time in non atomic context as if
4596 * this is the first fpu instruction the exception handler
4597 * will fire before the instruction returns and it'll have to
4598 * allocate ram with GFP_KERNEL.
4599 */
4600 if (!used_math())
4601 kvm_fx_save(&vcpu->arch.host_fx_image);
4602
4603 /* Initialize guest FPU by resetting ours and saving into guest's */
4604 preempt_disable();
4605 kvm_fx_save(&vcpu->arch.host_fx_image);
4606 kvm_fx_finit();
4607 kvm_fx_save(&vcpu->arch.guest_fx_image);
4608 kvm_fx_restore(&vcpu->arch.host_fx_image);
4609 preempt_enable();
4610
4611 vcpu->arch.cr0 |= X86_CR0_ET;
4612 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
4613 vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
4614 memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
4615 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
4616 }
4617 EXPORT_SYMBOL_GPL(fx_init);
4618
4619 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
4620 {
4621 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
4622 return;
4623
4624 vcpu->guest_fpu_loaded = 1;
4625 kvm_fx_save(&vcpu->arch.host_fx_image);
4626 kvm_fx_restore(&vcpu->arch.guest_fx_image);
4627 }
4628 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
4629
4630 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
4631 {
4632 if (!vcpu->guest_fpu_loaded)
4633 return;
4634
4635 vcpu->guest_fpu_loaded = 0;
4636 kvm_fx_save(&vcpu->arch.guest_fx_image);
4637 kvm_fx_restore(&vcpu->arch.host_fx_image);
4638 ++vcpu->stat.fpu_reload;
4639 }
4640 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
4641
4642 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
4643 {
4644 if (vcpu->arch.time_page) {
4645 kvm_release_page_dirty(vcpu->arch.time_page);
4646 vcpu->arch.time_page = NULL;
4647 }
4648
4649 kvm_x86_ops->vcpu_free(vcpu);
4650 }
4651
4652 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
4653 unsigned int id)
4654 {
4655 return kvm_x86_ops->vcpu_create(kvm, id);
4656 }
4657
4658 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
4659 {
4660 int r;
4661
4662 /* We do fxsave: this must be aligned. */
4663 BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
4664
4665 vcpu->arch.mtrr_state.have_fixed = 1;
4666 vcpu_load(vcpu);
4667 r = kvm_arch_vcpu_reset(vcpu);
4668 if (r == 0)
4669 r = kvm_mmu_setup(vcpu);
4670 vcpu_put(vcpu);
4671 if (r < 0)
4672 goto free_vcpu;
4673
4674 return 0;
4675 free_vcpu:
4676 kvm_x86_ops->vcpu_free(vcpu);
4677 return r;
4678 }
4679
4680 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
4681 {
4682 vcpu_load(vcpu);
4683 kvm_mmu_unload(vcpu);
4684 vcpu_put(vcpu);
4685
4686 kvm_x86_ops->vcpu_free(vcpu);
4687 }
4688
4689 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
4690 {
4691 vcpu->arch.nmi_pending = false;
4692 vcpu->arch.nmi_injected = false;
4693
4694 vcpu->arch.switch_db_regs = 0;
4695 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
4696 vcpu->arch.dr6 = DR6_FIXED_1;
4697 vcpu->arch.dr7 = DR7_FIXED_1;
4698
4699 return kvm_x86_ops->vcpu_reset(vcpu);
4700 }
4701
4702 void kvm_arch_hardware_enable(void *garbage)
4703 {
4704 kvm_x86_ops->hardware_enable(garbage);
4705 }
4706
4707 void kvm_arch_hardware_disable(void *garbage)
4708 {
4709 kvm_x86_ops->hardware_disable(garbage);
4710 }
4711
4712 int kvm_arch_hardware_setup(void)
4713 {
4714 return kvm_x86_ops->hardware_setup();
4715 }
4716
4717 void kvm_arch_hardware_unsetup(void)
4718 {
4719 kvm_x86_ops->hardware_unsetup();
4720 }
4721
4722 void kvm_arch_check_processor_compat(void *rtn)
4723 {
4724 kvm_x86_ops->check_processor_compatibility(rtn);
4725 }
4726
4727 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
4728 {
4729 struct page *page;
4730 struct kvm *kvm;
4731 int r;
4732
4733 BUG_ON(vcpu->kvm == NULL);
4734 kvm = vcpu->kvm;
4735
4736 vcpu->arch.mmu.root_hpa = INVALID_PAGE;
4737 if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
4738 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4739 else
4740 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
4741
4742 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
4743 if (!page) {
4744 r = -ENOMEM;
4745 goto fail;
4746 }
4747 vcpu->arch.pio_data = page_address(page);
4748
4749 r = kvm_mmu_create(vcpu);
4750 if (r < 0)
4751 goto fail_free_pio_data;
4752
4753 if (irqchip_in_kernel(kvm)) {
4754 r = kvm_create_lapic(vcpu);
4755 if (r < 0)
4756 goto fail_mmu_destroy;
4757 }
4758
4759 vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
4760 GFP_KERNEL);
4761 if (!vcpu->arch.mce_banks) {
4762 r = -ENOMEM;
4763 goto fail_mmu_destroy;
4764 }
4765 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
4766
4767 return 0;
4768
4769 fail_mmu_destroy:
4770 kvm_mmu_destroy(vcpu);
4771 fail_free_pio_data:
4772 free_page((unsigned long)vcpu->arch.pio_data);
4773 fail:
4774 return r;
4775 }
4776
4777 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
4778 {
4779 kvm_free_lapic(vcpu);
4780 down_read(&vcpu->kvm->slots_lock);
4781 kvm_mmu_destroy(vcpu);
4782 up_read(&vcpu->kvm->slots_lock);
4783 free_page((unsigned long)vcpu->arch.pio_data);
4784 }
4785
4786 struct kvm *kvm_arch_create_vm(void)
4787 {
4788 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
4789
4790 if (!kvm)
4791 return ERR_PTR(-ENOMEM);
4792
4793 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
4794 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
4795
4796 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
4797 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
4798
4799 rdtscll(kvm->arch.vm_init_tsc);
4800
4801 return kvm;
4802 }
4803
4804 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
4805 {
4806 vcpu_load(vcpu);
4807 kvm_mmu_unload(vcpu);
4808 vcpu_put(vcpu);
4809 }
4810
4811 static void kvm_free_vcpus(struct kvm *kvm)
4812 {
4813 unsigned int i;
4814 struct kvm_vcpu *vcpu;
4815
4816 /*
4817 * Unpin any mmu pages first.
4818 */
4819 kvm_for_each_vcpu(i, vcpu, kvm)
4820 kvm_unload_vcpu_mmu(vcpu);
4821 kvm_for_each_vcpu(i, vcpu, kvm)
4822 kvm_arch_vcpu_free(vcpu);
4823
4824 mutex_lock(&kvm->lock);
4825 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
4826 kvm->vcpus[i] = NULL;
4827
4828 atomic_set(&kvm->online_vcpus, 0);
4829 mutex_unlock(&kvm->lock);
4830 }
4831
4832 void kvm_arch_sync_events(struct kvm *kvm)
4833 {
4834 kvm_free_all_assigned_devices(kvm);
4835 }
4836
4837 void kvm_arch_destroy_vm(struct kvm *kvm)
4838 {
4839 kvm_iommu_unmap_guest(kvm);
4840 kvm_free_pit(kvm);
4841 kfree(kvm->arch.vpic);
4842 kfree(kvm->arch.vioapic);
4843 kvm_free_vcpus(kvm);
4844 kvm_free_physmem(kvm);
4845 if (kvm->arch.apic_access_page)
4846 put_page(kvm->arch.apic_access_page);
4847 if (kvm->arch.ept_identity_pagetable)
4848 put_page(kvm->arch.ept_identity_pagetable);
4849 kfree(kvm);
4850 }
4851
4852 int kvm_arch_set_memory_region(struct kvm *kvm,
4853 struct kvm_userspace_memory_region *mem,
4854 struct kvm_memory_slot old,
4855 int user_alloc)
4856 {
4857 int npages = mem->memory_size >> PAGE_SHIFT;
4858 struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
4859
4860 /*To keep backward compatibility with older userspace,
4861 *x86 needs to hanlde !user_alloc case.
4862 */
4863 if (!user_alloc) {
4864 if (npages && !old.rmap) {
4865 unsigned long userspace_addr;
4866
4867 down_write(&current->mm->mmap_sem);
4868 userspace_addr = do_mmap(NULL, 0,
4869 npages * PAGE_SIZE,
4870 PROT_READ | PROT_WRITE,
4871 MAP_PRIVATE | MAP_ANONYMOUS,
4872 0);
4873 up_write(&current->mm->mmap_sem);
4874
4875 if (IS_ERR((void *)userspace_addr))
4876 return PTR_ERR((void *)userspace_addr);
4877
4878 /* set userspace_addr atomically for kvm_hva_to_rmapp */
4879 spin_lock(&kvm->mmu_lock);
4880 memslot->userspace_addr = userspace_addr;
4881 spin_unlock(&kvm->mmu_lock);
4882 } else {
4883 if (!old.user_alloc && old.rmap) {
4884 int ret;
4885
4886 down_write(&current->mm->mmap_sem);
4887 ret = do_munmap(current->mm, old.userspace_addr,
4888 old.npages * PAGE_SIZE);
4889 up_write(&current->mm->mmap_sem);
4890 if (ret < 0)
4891 printk(KERN_WARNING
4892 "kvm_vm_ioctl_set_memory_region: "
4893 "failed to munmap memory\n");
4894 }
4895 }
4896 }
4897
4898 spin_lock(&kvm->mmu_lock);
4899 if (!kvm->arch.n_requested_mmu_pages) {
4900 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
4901 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
4902 }
4903
4904 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
4905 spin_unlock(&kvm->mmu_lock);
4906
4907 return 0;
4908 }
4909
4910 void kvm_arch_flush_shadow(struct kvm *kvm)
4911 {
4912 kvm_mmu_zap_all(kvm);
4913 kvm_reload_remote_mmus(kvm);
4914 }
4915
4916 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
4917 {
4918 return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
4919 || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
4920 || vcpu->arch.nmi_pending ||
4921 (kvm_arch_interrupt_allowed(vcpu) &&
4922 kvm_cpu_has_interrupt(vcpu));
4923 }
4924
4925 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
4926 {
4927 int me;
4928 int cpu = vcpu->cpu;
4929
4930 if (waitqueue_active(&vcpu->wq)) {
4931 wake_up_interruptible(&vcpu->wq);
4932 ++vcpu->stat.halt_wakeup;
4933 }
4934
4935 me = get_cpu();
4936 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
4937 if (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests))
4938 smp_send_reschedule(cpu);
4939 put_cpu();
4940 }
4941
4942 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
4943 {
4944 return kvm_x86_ops->interrupt_allowed(vcpu);
4945 }
4946
4947 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
4948 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
4949 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
4950 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
4951 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
Linux with added FPC-III support