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KVM: x86: Drop unneeded CONFIG_HAS_IOMEM check
[linux-2.6/kvm.git] / arch / x86 / kvm / x86.c
blob5d450cc6f84182b280147e7fb2a78f577c632548
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 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
239 {
240 unsigned long rflags;
241
242 rflags = kvm_x86_ops->get_rflags(vcpu);
243 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
244 rflags &= ~(unsigned long)(X86_EFLAGS_TF | X86_EFLAGS_RF);
245 return rflags;
246 }
247 EXPORT_SYMBOL_GPL(kvm_get_rflags);
248
249 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
250 {
251 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
252 rflags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
253 kvm_x86_ops->set_rflags(vcpu, rflags);
254 }
255 EXPORT_SYMBOL_GPL(kvm_set_rflags);
256
257 /*
258 * Load the pae pdptrs. Return true is they are all valid.
259 */
260 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
261 {
262 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
263 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
264 int i;
265 int ret;
266 u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
267
268 ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
269 offset * sizeof(u64), sizeof(pdpte));
270 if (ret < 0) {
271 ret = 0;
272 goto out;
273 }
274 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
275 if (is_present_gpte(pdpte[i]) &&
276 (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
277 ret = 0;
278 goto out;
279 }
280 }
281 ret = 1;
282
283 memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
284 __set_bit(VCPU_EXREG_PDPTR,
285 (unsigned long *)&vcpu->arch.regs_avail);
286 __set_bit(VCPU_EXREG_PDPTR,
287 (unsigned long *)&vcpu->arch.regs_dirty);
288 out:
289
290 return ret;
291 }
292 EXPORT_SYMBOL_GPL(load_pdptrs);
293
294 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
295 {
296 u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
297 bool changed = true;
298 int r;
299
300 if (is_long_mode(vcpu) || !is_pae(vcpu))
301 return false;
302
303 if (!test_bit(VCPU_EXREG_PDPTR,
304 (unsigned long *)&vcpu->arch.regs_avail))
305 return true;
306
307 r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
308 if (r < 0)
309 goto out;
310 changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
311 out:
312
313 return changed;
314 }
315
316 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
317 {
318 if (cr0 & CR0_RESERVED_BITS) {
319 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
320 cr0, vcpu->arch.cr0);
321 kvm_inject_gp(vcpu, 0);
322 return;
323 }
324
325 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
326 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
327 kvm_inject_gp(vcpu, 0);
328 return;
329 }
330
331 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
332 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
333 "and a clear PE flag\n");
334 kvm_inject_gp(vcpu, 0);
335 return;
336 }
337
338 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
339 #ifdef CONFIG_X86_64
340 if ((vcpu->arch.shadow_efer & EFER_LME)) {
341 int cs_db, cs_l;
342
343 if (!is_pae(vcpu)) {
344 printk(KERN_DEBUG "set_cr0: #GP, start paging "
345 "in long mode while PAE is disabled\n");
346 kvm_inject_gp(vcpu, 0);
347 return;
348 }
349 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
350 if (cs_l) {
351 printk(KERN_DEBUG "set_cr0: #GP, start paging "
352 "in long mode while CS.L == 1\n");
353 kvm_inject_gp(vcpu, 0);
354 return;
355
356 }
357 } else
358 #endif
359 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
360 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
361 "reserved bits\n");
362 kvm_inject_gp(vcpu, 0);
363 return;
364 }
365
366 }
367
368 kvm_x86_ops->set_cr0(vcpu, cr0);
369 vcpu->arch.cr0 = cr0;
370
371 kvm_mmu_reset_context(vcpu);
372 return;
373 }
374 EXPORT_SYMBOL_GPL(kvm_set_cr0);
375
376 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
377 {
378 kvm_set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
379 }
380 EXPORT_SYMBOL_GPL(kvm_lmsw);
381
382 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
383 {
384 unsigned long old_cr4 = vcpu->arch.cr4;
385 unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE;
386
387 if (cr4 & CR4_RESERVED_BITS) {
388 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
389 kvm_inject_gp(vcpu, 0);
390 return;
391 }
392
393 if (is_long_mode(vcpu)) {
394 if (!(cr4 & X86_CR4_PAE)) {
395 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
396 "in long mode\n");
397 kvm_inject_gp(vcpu, 0);
398 return;
399 }
400 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
401 && ((cr4 ^ old_cr4) & pdptr_bits)
402 && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
403 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
404 kvm_inject_gp(vcpu, 0);
405 return;
406 }
407
408 if (cr4 & X86_CR4_VMXE) {
409 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
410 kvm_inject_gp(vcpu, 0);
411 return;
412 }
413 kvm_x86_ops->set_cr4(vcpu, cr4);
414 vcpu->arch.cr4 = cr4;
415 vcpu->arch.mmu.base_role.cr4_pge = (cr4 & X86_CR4_PGE) && !tdp_enabled;
416 kvm_mmu_reset_context(vcpu);
417 }
418 EXPORT_SYMBOL_GPL(kvm_set_cr4);
419
420 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
421 {
422 if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
423 kvm_mmu_sync_roots(vcpu);
424 kvm_mmu_flush_tlb(vcpu);
425 return;
426 }
427
428 if (is_long_mode(vcpu)) {
429 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
430 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
431 kvm_inject_gp(vcpu, 0);
432 return;
433 }
434 } else {
435 if (is_pae(vcpu)) {
436 if (cr3 & CR3_PAE_RESERVED_BITS) {
437 printk(KERN_DEBUG
438 "set_cr3: #GP, reserved bits\n");
439 kvm_inject_gp(vcpu, 0);
440 return;
441 }
442 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
443 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
444 "reserved bits\n");
445 kvm_inject_gp(vcpu, 0);
446 return;
447 }
448 }
449 /*
450 * We don't check reserved bits in nonpae mode, because
451 * this isn't enforced, and VMware depends on this.
452 */
453 }
454
455 /*
456 * Does the new cr3 value map to physical memory? (Note, we
457 * catch an invalid cr3 even in real-mode, because it would
458 * cause trouble later on when we turn on paging anyway.)
459 *
460 * A real CPU would silently accept an invalid cr3 and would
461 * attempt to use it - with largely undefined (and often hard
462 * to debug) behavior on the guest side.
463 */
464 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
465 kvm_inject_gp(vcpu, 0);
466 else {
467 vcpu->arch.cr3 = cr3;
468 vcpu->arch.mmu.new_cr3(vcpu);
469 }
470 }
471 EXPORT_SYMBOL_GPL(kvm_set_cr3);
472
473 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
474 {
475 if (cr8 & CR8_RESERVED_BITS) {
476 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
477 kvm_inject_gp(vcpu, 0);
478 return;
479 }
480 if (irqchip_in_kernel(vcpu->kvm))
481 kvm_lapic_set_tpr(vcpu, cr8);
482 else
483 vcpu->arch.cr8 = cr8;
484 }
485 EXPORT_SYMBOL_GPL(kvm_set_cr8);
486
487 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
488 {
489 if (irqchip_in_kernel(vcpu->kvm))
490 return kvm_lapic_get_cr8(vcpu);
491 else
492 return vcpu->arch.cr8;
493 }
494 EXPORT_SYMBOL_GPL(kvm_get_cr8);
495
496 static inline u32 bit(int bitno)
497 {
498 return 1 << (bitno & 31);
499 }
500
501 /*
502 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
503 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
504 *
505 * This list is modified at module load time to reflect the
506 * capabilities of the host cpu. This capabilities test skips MSRs that are
507 * kvm-specific. Those are put in the beginning of the list.
508 */
509
510 #define KVM_SAVE_MSRS_BEGIN 2
511 static u32 msrs_to_save[] = {
512 MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
513 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
514 MSR_K6_STAR,
515 #ifdef CONFIG_X86_64
516 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
517 #endif
518 MSR_IA32_TSC, MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
519 };
520
521 static unsigned num_msrs_to_save;
522
523 static u32 emulated_msrs[] = {
524 MSR_IA32_MISC_ENABLE,
525 };
526
527 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
528 {
529 if (efer & efer_reserved_bits) {
530 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
531 efer);
532 kvm_inject_gp(vcpu, 0);
533 return;
534 }
535
536 if (is_paging(vcpu)
537 && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) {
538 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
539 kvm_inject_gp(vcpu, 0);
540 return;
541 }
542
543 if (efer & EFER_FFXSR) {
544 struct kvm_cpuid_entry2 *feat;
545
546 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
547 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT))) {
548 printk(KERN_DEBUG "set_efer: #GP, enable FFXSR w/o CPUID capability\n");
549 kvm_inject_gp(vcpu, 0);
550 return;
551 }
552 }
553
554 if (efer & EFER_SVME) {
555 struct kvm_cpuid_entry2 *feat;
556
557 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
558 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM))) {
559 printk(KERN_DEBUG "set_efer: #GP, enable SVM w/o SVM\n");
560 kvm_inject_gp(vcpu, 0);
561 return;
562 }
563 }
564
565 kvm_x86_ops->set_efer(vcpu, efer);
566
567 efer &= ~EFER_LMA;
568 efer |= vcpu->arch.shadow_efer & EFER_LMA;
569
570 vcpu->arch.shadow_efer = efer;
571
572 vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
573 kvm_mmu_reset_context(vcpu);
574 }
575
576 void kvm_enable_efer_bits(u64 mask)
577 {
578 efer_reserved_bits &= ~mask;
579 }
580 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
581
582
583 /*
584 * Writes msr value into into the appropriate "register".
585 * Returns 0 on success, non-0 otherwise.
586 * Assumes vcpu_load() was already called.
587 */
588 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
589 {
590 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
591 }
592
593 /*
594 * Adapt set_msr() to msr_io()'s calling convention
595 */
596 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
597 {
598 return kvm_set_msr(vcpu, index, *data);
599 }
600
601 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
602 {
603 static int version;
604 struct pvclock_wall_clock wc;
605 struct timespec now, sys, boot;
606
607 if (!wall_clock)
608 return;
609
610 version++;
611
612 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
613
614 /*
615 * The guest calculates current wall clock time by adding
616 * system time (updated by kvm_write_guest_time below) to the
617 * wall clock specified here. guest system time equals host
618 * system time for us, thus we must fill in host boot time here.
619 */
620 now = current_kernel_time();
621 ktime_get_ts(&sys);
622 boot = ns_to_timespec(timespec_to_ns(&now) - timespec_to_ns(&sys));
623
624 wc.sec = boot.tv_sec;
625 wc.nsec = boot.tv_nsec;
626 wc.version = version;
627
628 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
629
630 version++;
631 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
632 }
633
634 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
635 {
636 uint32_t quotient, remainder;
637
638 /* Don't try to replace with do_div(), this one calculates
639 * "(dividend << 32) / divisor" */
640 __asm__ ( "divl %4"
641 : "=a" (quotient), "=d" (remainder)
642 : "0" (0), "1" (dividend), "r" (divisor) );
643 return quotient;
644 }
645
646 static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock)
647 {
648 uint64_t nsecs = 1000000000LL;
649 int32_t shift = 0;
650 uint64_t tps64;
651 uint32_t tps32;
652
653 tps64 = tsc_khz * 1000LL;
654 while (tps64 > nsecs*2) {
655 tps64 >>= 1;
656 shift--;
657 }
658
659 tps32 = (uint32_t)tps64;
660 while (tps32 <= (uint32_t)nsecs) {
661 tps32 <<= 1;
662 shift++;
663 }
664
665 hv_clock->tsc_shift = shift;
666 hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32);
667
668 pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n",
669 __func__, tsc_khz, hv_clock->tsc_shift,
670 hv_clock->tsc_to_system_mul);
671 }
672
673 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
674
675 static void kvm_write_guest_time(struct kvm_vcpu *v)
676 {
677 struct timespec ts;
678 unsigned long flags;
679 struct kvm_vcpu_arch *vcpu = &v->arch;
680 void *shared_kaddr;
681 unsigned long this_tsc_khz;
682
683 if ((!vcpu->time_page))
684 return;
685
686 this_tsc_khz = get_cpu_var(cpu_tsc_khz);
687 if (unlikely(vcpu->hv_clock_tsc_khz != this_tsc_khz)) {
688 kvm_set_time_scale(this_tsc_khz, &vcpu->hv_clock);
689 vcpu->hv_clock_tsc_khz = this_tsc_khz;
690 }
691 put_cpu_var(cpu_tsc_khz);
692
693 /* Keep irq disabled to prevent changes to the clock */
694 local_irq_save(flags);
695 kvm_get_msr(v, MSR_IA32_TSC, &vcpu->hv_clock.tsc_timestamp);
696 ktime_get_ts(&ts);
697 local_irq_restore(flags);
698
699 /* With all the info we got, fill in the values */
700
701 vcpu->hv_clock.system_time = ts.tv_nsec +
702 (NSEC_PER_SEC * (u64)ts.tv_sec);
703 /*
704 * The interface expects us to write an even number signaling that the
705 * update is finished. Since the guest won't see the intermediate
706 * state, we just increase by 2 at the end.
707 */
708 vcpu->hv_clock.version += 2;
709
710 shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
711
712 memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
713 sizeof(vcpu->hv_clock));
714
715 kunmap_atomic(shared_kaddr, KM_USER0);
716
717 mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
718 }
719
720 static int kvm_request_guest_time_update(struct kvm_vcpu *v)
721 {
722 struct kvm_vcpu_arch *vcpu = &v->arch;
723
724 if (!vcpu->time_page)
725 return 0;
726 set_bit(KVM_REQ_KVMCLOCK_UPDATE, &v->requests);
727 return 1;
728 }
729
730 static bool msr_mtrr_valid(unsigned msr)
731 {
732 switch (msr) {
733 case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
734 case MSR_MTRRfix64K_00000:
735 case MSR_MTRRfix16K_80000:
736 case MSR_MTRRfix16K_A0000:
737 case MSR_MTRRfix4K_C0000:
738 case MSR_MTRRfix4K_C8000:
739 case MSR_MTRRfix4K_D0000:
740 case MSR_MTRRfix4K_D8000:
741 case MSR_MTRRfix4K_E0000:
742 case MSR_MTRRfix4K_E8000:
743 case MSR_MTRRfix4K_F0000:
744 case MSR_MTRRfix4K_F8000:
745 case MSR_MTRRdefType:
746 case MSR_IA32_CR_PAT:
747 return true;
748 case 0x2f8:
749 return true;
750 }
751 return false;
752 }
753
754 static bool valid_pat_type(unsigned t)
755 {
756 return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
757 }
758
759 static bool valid_mtrr_type(unsigned t)
760 {
761 return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
762 }
763
764 static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
765 {
766 int i;
767
768 if (!msr_mtrr_valid(msr))
769 return false;
770
771 if (msr == MSR_IA32_CR_PAT) {
772 for (i = 0; i < 8; i++)
773 if (!valid_pat_type((data >> (i * 8)) & 0xff))
774 return false;
775 return true;
776 } else if (msr == MSR_MTRRdefType) {
777 if (data & ~0xcff)
778 return false;
779 return valid_mtrr_type(data & 0xff);
780 } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
781 for (i = 0; i < 8 ; i++)
782 if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
783 return false;
784 return true;
785 }
786
787 /* variable MTRRs */
788 return valid_mtrr_type(data & 0xff);
789 }
790
791 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
792 {
793 u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
794
795 if (!mtrr_valid(vcpu, msr, data))
796 return 1;
797
798 if (msr == MSR_MTRRdefType) {
799 vcpu->arch.mtrr_state.def_type = data;
800 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
801 } else if (msr == MSR_MTRRfix64K_00000)
802 p[0] = data;
803 else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
804 p[1 + msr - MSR_MTRRfix16K_80000] = data;
805 else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
806 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
807 else if (msr == MSR_IA32_CR_PAT)
808 vcpu->arch.pat = data;
809 else { /* Variable MTRRs */
810 int idx, is_mtrr_mask;
811 u64 *pt;
812
813 idx = (msr - 0x200) / 2;
814 is_mtrr_mask = msr - 0x200 - 2 * idx;
815 if (!is_mtrr_mask)
816 pt =
817 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
818 else
819 pt =
820 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
821 *pt = data;
822 }
823
824 kvm_mmu_reset_context(vcpu);
825 return 0;
826 }
827
828 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
829 {
830 u64 mcg_cap = vcpu->arch.mcg_cap;
831 unsigned bank_num = mcg_cap & 0xff;
832
833 switch (msr) {
834 case MSR_IA32_MCG_STATUS:
835 vcpu->arch.mcg_status = data;
836 break;
837 case MSR_IA32_MCG_CTL:
838 if (!(mcg_cap & MCG_CTL_P))
839 return 1;
840 if (data != 0 && data != ~(u64)0)
841 return -1;
842 vcpu->arch.mcg_ctl = data;
843 break;
844 default:
845 if (msr >= MSR_IA32_MC0_CTL &&
846 msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
847 u32 offset = msr - MSR_IA32_MC0_CTL;
848 /* only 0 or all 1s can be written to IA32_MCi_CTL */
849 if ((offset & 0x3) == 0 &&
850 data != 0 && data != ~(u64)0)
851 return -1;
852 vcpu->arch.mce_banks[offset] = data;
853 break;
854 }
855 return 1;
856 }
857 return 0;
858 }
859
860 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
861 {
862 switch (msr) {
863 case MSR_EFER:
864 set_efer(vcpu, data);
865 break;
866 case MSR_K7_HWCR:
867 data &= ~(u64)0x40; /* ignore flush filter disable */
868 if (data != 0) {
869 pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
870 data);
871 return 1;
872 }
873 break;
874 case MSR_FAM10H_MMIO_CONF_BASE:
875 if (data != 0) {
876 pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
877 "0x%llx\n", data);
878 return 1;
879 }
880 break;
881 case MSR_AMD64_NB_CFG:
882 break;
883 case MSR_IA32_DEBUGCTLMSR:
884 if (!data) {
885 /* We support the non-activated case already */
886 break;
887 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
888 /* Values other than LBR and BTF are vendor-specific,
889 thus reserved and should throw a #GP */
890 return 1;
891 }
892 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
893 __func__, data);
894 break;
895 case MSR_IA32_UCODE_REV:
896 case MSR_IA32_UCODE_WRITE:
897 case MSR_VM_HSAVE_PA:
898 case MSR_AMD64_PATCH_LOADER:
899 break;
900 case 0x200 ... 0x2ff:
901 return set_msr_mtrr(vcpu, msr, data);
902 case MSR_IA32_APICBASE:
903 kvm_set_apic_base(vcpu, data);
904 break;
905 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
906 return kvm_x2apic_msr_write(vcpu, msr, data);
907 case MSR_IA32_MISC_ENABLE:
908 vcpu->arch.ia32_misc_enable_msr = data;
909 break;
910 case MSR_KVM_WALL_CLOCK:
911 vcpu->kvm->arch.wall_clock = data;
912 kvm_write_wall_clock(vcpu->kvm, data);
913 break;
914 case MSR_KVM_SYSTEM_TIME: {
915 if (vcpu->arch.time_page) {
916 kvm_release_page_dirty(vcpu->arch.time_page);
917 vcpu->arch.time_page = NULL;
918 }
919
920 vcpu->arch.time = data;
921
922 /* we verify if the enable bit is set... */
923 if (!(data & 1))
924 break;
925
926 /* ...but clean it before doing the actual write */
927 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
928
929 vcpu->arch.time_page =
930 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
931
932 if (is_error_page(vcpu->arch.time_page)) {
933 kvm_release_page_clean(vcpu->arch.time_page);
934 vcpu->arch.time_page = NULL;
935 }
936
937 kvm_request_guest_time_update(vcpu);
938 break;
939 }
940 case MSR_IA32_MCG_CTL:
941 case MSR_IA32_MCG_STATUS:
942 case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
943 return set_msr_mce(vcpu, msr, data);
944
945 /* Performance counters are not protected by a CPUID bit,
946 * so we should check all of them in the generic path for the sake of
947 * cross vendor migration.
948 * Writing a zero into the event select MSRs disables them,
949 * which we perfectly emulate ;-). Any other value should be at least
950 * reported, some guests depend on them.
951 */
952 case MSR_P6_EVNTSEL0:
953 case MSR_P6_EVNTSEL1:
954 case MSR_K7_EVNTSEL0:
955 case MSR_K7_EVNTSEL1:
956 case MSR_K7_EVNTSEL2:
957 case MSR_K7_EVNTSEL3:
958 if (data != 0)
959 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
960 "0x%x data 0x%llx\n", msr, data);
961 break;
962 /* at least RHEL 4 unconditionally writes to the perfctr registers,
963 * so we ignore writes to make it happy.
964 */
965 case MSR_P6_PERFCTR0:
966 case MSR_P6_PERFCTR1:
967 case MSR_K7_PERFCTR0:
968 case MSR_K7_PERFCTR1:
969 case MSR_K7_PERFCTR2:
970 case MSR_K7_PERFCTR3:
971 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
972 "0x%x data 0x%llx\n", msr, data);
973 break;
974 default:
975 if (!ignore_msrs) {
976 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
977 msr, data);
978 return 1;
979 } else {
980 pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
981 msr, data);
982 break;
983 }
984 }
985 return 0;
986 }
987 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
988
989
990 /*
991 * Reads an msr value (of 'msr_index') into 'pdata'.
992 * Returns 0 on success, non-0 otherwise.
993 * Assumes vcpu_load() was already called.
994 */
995 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
996 {
997 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
998 }
999
1000 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1001 {
1002 u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1003
1004 if (!msr_mtrr_valid(msr))
1005 return 1;
1006
1007 if (msr == MSR_MTRRdefType)
1008 *pdata = vcpu->arch.mtrr_state.def_type +
1009 (vcpu->arch.mtrr_state.enabled << 10);
1010 else if (msr == MSR_MTRRfix64K_00000)
1011 *pdata = p[0];
1012 else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1013 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
1014 else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1015 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
1016 else if (msr == MSR_IA32_CR_PAT)
1017 *pdata = vcpu->arch.pat;
1018 else { /* Variable MTRRs */
1019 int idx, is_mtrr_mask;
1020 u64 *pt;
1021
1022 idx = (msr - 0x200) / 2;
1023 is_mtrr_mask = msr - 0x200 - 2 * idx;
1024 if (!is_mtrr_mask)
1025 pt =
1026 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1027 else
1028 pt =
1029 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1030 *pdata = *pt;
1031 }
1032
1033 return 0;
1034 }
1035
1036 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1037 {
1038 u64 data;
1039 u64 mcg_cap = vcpu->arch.mcg_cap;
1040 unsigned bank_num = mcg_cap & 0xff;
1041
1042 switch (msr) {
1043 case MSR_IA32_P5_MC_ADDR:
1044 case MSR_IA32_P5_MC_TYPE:
1045 data = 0;
1046 break;
1047 case MSR_IA32_MCG_CAP:
1048 data = vcpu->arch.mcg_cap;
1049 break;
1050 case MSR_IA32_MCG_CTL:
1051 if (!(mcg_cap & MCG_CTL_P))
1052 return 1;
1053 data = vcpu->arch.mcg_ctl;
1054 break;
1055 case MSR_IA32_MCG_STATUS:
1056 data = vcpu->arch.mcg_status;
1057 break;
1058 default:
1059 if (msr >= MSR_IA32_MC0_CTL &&
1060 msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1061 u32 offset = msr - MSR_IA32_MC0_CTL;
1062 data = vcpu->arch.mce_banks[offset];
1063 break;
1064 }
1065 return 1;
1066 }
1067 *pdata = data;
1068 return 0;
1069 }
1070
1071 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1072 {
1073 u64 data;
1074
1075 switch (msr) {
1076 case MSR_IA32_PLATFORM_ID:
1077 case MSR_IA32_UCODE_REV:
1078 case MSR_IA32_EBL_CR_POWERON:
1079 case MSR_IA32_DEBUGCTLMSR:
1080 case MSR_IA32_LASTBRANCHFROMIP:
1081 case MSR_IA32_LASTBRANCHTOIP:
1082 case MSR_IA32_LASTINTFROMIP:
1083 case MSR_IA32_LASTINTTOIP:
1084 case MSR_K8_SYSCFG:
1085 case MSR_K7_HWCR:
1086 case MSR_VM_HSAVE_PA:
1087 case MSR_P6_PERFCTR0:
1088 case MSR_P6_PERFCTR1:
1089 case MSR_P6_EVNTSEL0:
1090 case MSR_P6_EVNTSEL1:
1091 case MSR_K7_EVNTSEL0:
1092 case MSR_K7_PERFCTR0:
1093 case MSR_K8_INT_PENDING_MSG:
1094 case MSR_AMD64_NB_CFG:
1095 case MSR_FAM10H_MMIO_CONF_BASE:
1096 data = 0;
1097 break;
1098 case MSR_MTRRcap:
1099 data = 0x500 | KVM_NR_VAR_MTRR;
1100 break;
1101 case 0x200 ... 0x2ff:
1102 return get_msr_mtrr(vcpu, msr, pdata);
1103 case 0xcd: /* fsb frequency */
1104 data = 3;
1105 break;
1106 case MSR_IA32_APICBASE:
1107 data = kvm_get_apic_base(vcpu);
1108 break;
1109 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1110 return kvm_x2apic_msr_read(vcpu, msr, pdata);
1111 break;
1112 case MSR_IA32_MISC_ENABLE:
1113 data = vcpu->arch.ia32_misc_enable_msr;
1114 break;
1115 case MSR_IA32_PERF_STATUS:
1116 /* TSC increment by tick */
1117 data = 1000ULL;
1118 /* CPU multiplier */
1119 data |= (((uint64_t)4ULL) << 40);
1120 break;
1121 case MSR_EFER:
1122 data = vcpu->arch.shadow_efer;
1123 break;
1124 case MSR_KVM_WALL_CLOCK:
1125 data = vcpu->kvm->arch.wall_clock;
1126 break;
1127 case MSR_KVM_SYSTEM_TIME:
1128 data = vcpu->arch.time;
1129 break;
1130 case MSR_IA32_P5_MC_ADDR:
1131 case MSR_IA32_P5_MC_TYPE:
1132 case MSR_IA32_MCG_CAP:
1133 case MSR_IA32_MCG_CTL:
1134 case MSR_IA32_MCG_STATUS:
1135 case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1136 return get_msr_mce(vcpu, msr, pdata);
1137 default:
1138 if (!ignore_msrs) {
1139 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1140 return 1;
1141 } else {
1142 pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
1143 data = 0;
1144 }
1145 break;
1146 }
1147 *pdata = data;
1148 return 0;
1149 }
1150 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1151
1152 /*
1153 * Read or write a bunch of msrs. All parameters are kernel addresses.
1154 *
1155 * @return number of msrs set successfully.
1156 */
1157 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
1158 struct kvm_msr_entry *entries,
1159 int (*do_msr)(struct kvm_vcpu *vcpu,
1160 unsigned index, u64 *data))
1161 {
1162 int i;
1163
1164 vcpu_load(vcpu);
1165
1166 down_read(&vcpu->kvm->slots_lock);
1167 for (i = 0; i < msrs->nmsrs; ++i)
1168 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1169 break;
1170 up_read(&vcpu->kvm->slots_lock);
1171
1172 vcpu_put(vcpu);
1173
1174 return i;
1175 }
1176
1177 /*
1178 * Read or write a bunch of msrs. Parameters are user addresses.
1179 *
1180 * @return number of msrs set successfully.
1181 */
1182 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
1183 int (*do_msr)(struct kvm_vcpu *vcpu,
1184 unsigned index, u64 *data),
1185 int writeback)
1186 {
1187 struct kvm_msrs msrs;
1188 struct kvm_msr_entry *entries;
1189 int r, n;
1190 unsigned size;
1191
1192 r = -EFAULT;
1193 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1194 goto out;
1195
1196 r = -E2BIG;
1197 if (msrs.nmsrs >= MAX_IO_MSRS)
1198 goto out;
1199
1200 r = -ENOMEM;
1201 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1202 entries = vmalloc(size);
1203 if (!entries)
1204 goto out;
1205
1206 r = -EFAULT;
1207 if (copy_from_user(entries, user_msrs->entries, size))
1208 goto out_free;
1209
1210 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
1211 if (r < 0)
1212 goto out_free;
1213
1214 r = -EFAULT;
1215 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1216 goto out_free;
1217
1218 r = n;
1219
1220 out_free:
1221 vfree(entries);
1222 out:
1223 return r;
1224 }
1225
1226 int kvm_dev_ioctl_check_extension(long ext)
1227 {
1228 int r;
1229
1230 switch (ext) {
1231 case KVM_CAP_IRQCHIP:
1232 case KVM_CAP_HLT:
1233 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
1234 case KVM_CAP_SET_TSS_ADDR:
1235 case KVM_CAP_EXT_CPUID:
1236 case KVM_CAP_CLOCKSOURCE:
1237 case KVM_CAP_PIT:
1238 case KVM_CAP_NOP_IO_DELAY:
1239 case KVM_CAP_MP_STATE:
1240 case KVM_CAP_SYNC_MMU:
1241 case KVM_CAP_REINJECT_CONTROL:
1242 case KVM_CAP_IRQ_INJECT_STATUS:
1243 case KVM_CAP_ASSIGN_DEV_IRQ:
1244 case KVM_CAP_IRQFD:
1245 case KVM_CAP_IOEVENTFD:
1246 case KVM_CAP_PIT2:
1247 case KVM_CAP_PIT_STATE2:
1248 case KVM_CAP_SET_IDENTITY_MAP_ADDR:
1249 r = 1;
1250 break;
1251 case KVM_CAP_COALESCED_MMIO:
1252 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
1253 break;
1254 case KVM_CAP_VAPIC:
1255 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
1256 break;
1257 case KVM_CAP_NR_VCPUS:
1258 r = KVM_MAX_VCPUS;
1259 break;
1260 case KVM_CAP_NR_MEMSLOTS:
1261 r = KVM_MEMORY_SLOTS;
1262 break;
1263 case KVM_CAP_PV_MMU: /* obsolete */
1264 r = 0;
1265 break;
1266 case KVM_CAP_IOMMU:
1267 r = iommu_found();
1268 break;
1269 case KVM_CAP_MCE:
1270 r = KVM_MAX_MCE_BANKS;
1271 break;
1272 default:
1273 r = 0;
1274 break;
1275 }
1276 return r;
1277
1278 }
1279
1280 long kvm_arch_dev_ioctl(struct file *filp,
1281 unsigned int ioctl, unsigned long arg)
1282 {
1283 void __user *argp = (void __user *)arg;
1284 long r;
1285
1286 switch (ioctl) {
1287 case KVM_GET_MSR_INDEX_LIST: {
1288 struct kvm_msr_list __user *user_msr_list = argp;
1289 struct kvm_msr_list msr_list;
1290 unsigned n;
1291
1292 r = -EFAULT;
1293 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1294 goto out;
1295 n = msr_list.nmsrs;
1296 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
1297 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1298 goto out;
1299 r = -E2BIG;
1300 if (n < msr_list.nmsrs)
1301 goto out;
1302 r = -EFAULT;
1303 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1304 num_msrs_to_save * sizeof(u32)))
1305 goto out;
1306 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
1307 &emulated_msrs,
1308 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1309 goto out;
1310 r = 0;
1311 break;
1312 }
1313 case KVM_GET_SUPPORTED_CPUID: {
1314 struct kvm_cpuid2 __user *cpuid_arg = argp;
1315 struct kvm_cpuid2 cpuid;
1316
1317 r = -EFAULT;
1318 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1319 goto out;
1320 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
1321 cpuid_arg->entries);
1322 if (r)
1323 goto out;
1324
1325 r = -EFAULT;
1326 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1327 goto out;
1328 r = 0;
1329 break;
1330 }
1331 case KVM_X86_GET_MCE_CAP_SUPPORTED: {
1332 u64 mce_cap;
1333
1334 mce_cap = KVM_MCE_CAP_SUPPORTED;
1335 r = -EFAULT;
1336 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
1337 goto out;
1338 r = 0;
1339 break;
1340 }
1341 default:
1342 r = -EINVAL;
1343 }
1344 out:
1345 return r;
1346 }
1347
1348 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1349 {
1350 kvm_x86_ops->vcpu_load(vcpu, cpu);
1351 if (unlikely(per_cpu(cpu_tsc_khz, cpu) == 0)) {
1352 unsigned long khz = cpufreq_quick_get(cpu);
1353 if (!khz)
1354 khz = tsc_khz;
1355 per_cpu(cpu_tsc_khz, cpu) = khz;
1356 }
1357 kvm_request_guest_time_update(vcpu);
1358 }
1359
1360 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
1361 {
1362 kvm_x86_ops->vcpu_put(vcpu);
1363 kvm_put_guest_fpu(vcpu);
1364 }
1365
1366 static int is_efer_nx(void)
1367 {
1368 unsigned long long efer = 0;
1369
1370 rdmsrl_safe(MSR_EFER, &efer);
1371 return efer & EFER_NX;
1372 }
1373
1374 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
1375 {
1376 int i;
1377 struct kvm_cpuid_entry2 *e, *entry;
1378
1379 entry = NULL;
1380 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
1381 e = &vcpu->arch.cpuid_entries[i];
1382 if (e->function == 0x80000001) {
1383 entry = e;
1384 break;
1385 }
1386 }
1387 if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
1388 entry->edx &= ~(1 << 20);
1389 printk(KERN_INFO "kvm: guest NX capability removed\n");
1390 }
1391 }
1392
1393 /* when an old userspace process fills a new kernel module */
1394 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
1395 struct kvm_cpuid *cpuid,
1396 struct kvm_cpuid_entry __user *entries)
1397 {
1398 int r, i;
1399 struct kvm_cpuid_entry *cpuid_entries;
1400
1401 r = -E2BIG;
1402 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1403 goto out;
1404 r = -ENOMEM;
1405 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
1406 if (!cpuid_entries)
1407 goto out;
1408 r = -EFAULT;
1409 if (copy_from_user(cpuid_entries, entries,
1410 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
1411 goto out_free;
1412 for (i = 0; i < cpuid->nent; i++) {
1413 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
1414 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
1415 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
1416 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
1417 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
1418 vcpu->arch.cpuid_entries[i].index = 0;
1419 vcpu->arch.cpuid_entries[i].flags = 0;
1420 vcpu->arch.cpuid_entries[i].padding[0] = 0;
1421 vcpu->arch.cpuid_entries[i].padding[1] = 0;
1422 vcpu->arch.cpuid_entries[i].padding[2] = 0;
1423 }
1424 vcpu->arch.cpuid_nent = cpuid->nent;
1425 cpuid_fix_nx_cap(vcpu);
1426 r = 0;
1427 kvm_apic_set_version(vcpu);
1428
1429 out_free:
1430 vfree(cpuid_entries);
1431 out:
1432 return r;
1433 }
1434
1435 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
1436 struct kvm_cpuid2 *cpuid,
1437 struct kvm_cpuid_entry2 __user *entries)
1438 {
1439 int r;
1440
1441 r = -E2BIG;
1442 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1443 goto out;
1444 r = -EFAULT;
1445 if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
1446 cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
1447 goto out;
1448 vcpu->arch.cpuid_nent = cpuid->nent;
1449 kvm_apic_set_version(vcpu);
1450 return 0;
1451
1452 out:
1453 return r;
1454 }
1455
1456 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
1457 struct kvm_cpuid2 *cpuid,
1458 struct kvm_cpuid_entry2 __user *entries)
1459 {
1460 int r;
1461
1462 r = -E2BIG;
1463 if (cpuid->nent < vcpu->arch.cpuid_nent)
1464 goto out;
1465 r = -EFAULT;
1466 if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
1467 vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
1468 goto out;
1469 return 0;
1470
1471 out:
1472 cpuid->nent = vcpu->arch.cpuid_nent;
1473 return r;
1474 }
1475
1476 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1477 u32 index)
1478 {
1479 entry->function = function;
1480 entry->index = index;
1481 cpuid_count(entry->function, entry->index,
1482 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
1483 entry->flags = 0;
1484 }
1485
1486 #define F(x) bit(X86_FEATURE_##x)
1487
1488 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1489 u32 index, int *nent, int maxnent)
1490 {
1491 unsigned f_nx = is_efer_nx() ? F(NX) : 0;
1492 unsigned f_gbpages = kvm_x86_ops->gb_page_enable() ? F(GBPAGES) : 0;
1493 #ifdef CONFIG_X86_64
1494 unsigned f_lm = F(LM);
1495 #else
1496 unsigned f_lm = 0;
1497 #endif
1498
1499 /* cpuid 1.edx */
1500 const u32 kvm_supported_word0_x86_features =
1501 F(FPU) | F(VME) | F(DE) | F(PSE) |
1502 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
1503 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
1504 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
1505 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) |
1506 0 /* Reserved, DS, ACPI */ | F(MMX) |
1507 F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
1508 0 /* HTT, TM, Reserved, PBE */;
1509 /* cpuid 0x80000001.edx */
1510 const u32 kvm_supported_word1_x86_features =
1511 F(FPU) | F(VME) | F(DE) | F(PSE) |
1512 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
1513 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
1514 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
1515 F(PAT) | F(PSE36) | 0 /* Reserved */ |
1516 f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
1517 F(FXSR) | F(FXSR_OPT) | f_gbpages | 0 /* RDTSCP */ |
1518 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
1519 /* cpuid 1.ecx */
1520 const u32 kvm_supported_word4_x86_features =
1521 F(XMM3) | 0 /* Reserved, DTES64, MONITOR */ |
1522 0 /* DS-CPL, VMX, SMX, EST */ |
1523 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
1524 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ |
1525 0 /* Reserved, DCA */ | F(XMM4_1) |
1526 F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
1527 0 /* Reserved, XSAVE, OSXSAVE */;
1528 /* cpuid 0x80000001.ecx */
1529 const u32 kvm_supported_word6_x86_features =
1530 F(LAHF_LM) | F(CMP_LEGACY) | F(SVM) | 0 /* ExtApicSpace */ |
1531 F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
1532 F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(SSE5) |
1533 0 /* SKINIT */ | 0 /* WDT */;
1534
1535 /* all calls to cpuid_count() should be made on the same cpu */
1536 get_cpu();
1537 do_cpuid_1_ent(entry, function, index);
1538 ++*nent;
1539
1540 switch (function) {
1541 case 0:
1542 entry->eax = min(entry->eax, (u32)0xb);
1543 break;
1544 case 1:
1545 entry->edx &= kvm_supported_word0_x86_features;
1546 entry->ecx &= kvm_supported_word4_x86_features;
1547 /* we support x2apic emulation even if host does not support
1548 * it since we emulate x2apic in software */
1549 entry->ecx |= F(X2APIC);
1550 break;
1551 /* function 2 entries are STATEFUL. That is, repeated cpuid commands
1552 * may return different values. This forces us to get_cpu() before
1553 * issuing the first command, and also to emulate this annoying behavior
1554 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
1555 case 2: {
1556 int t, times = entry->eax & 0xff;
1557
1558 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1559 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
1560 for (t = 1; t < times && *nent < maxnent; ++t) {
1561 do_cpuid_1_ent(&entry[t], function, 0);
1562 entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1563 ++*nent;
1564 }
1565 break;
1566 }
1567 /* function 4 and 0xb have additional index. */
1568 case 4: {
1569 int i, cache_type;
1570
1571 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1572 /* read more entries until cache_type is zero */
1573 for (i = 1; *nent < maxnent; ++i) {
1574 cache_type = entry[i - 1].eax & 0x1f;
1575 if (!cache_type)
1576 break;
1577 do_cpuid_1_ent(&entry[i], function, i);
1578 entry[i].flags |=
1579 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1580 ++*nent;
1581 }
1582 break;
1583 }
1584 case 0xb: {
1585 int i, level_type;
1586
1587 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1588 /* read more entries until level_type is zero */
1589 for (i = 1; *nent < maxnent; ++i) {
1590 level_type = entry[i - 1].ecx & 0xff00;
1591 if (!level_type)
1592 break;
1593 do_cpuid_1_ent(&entry[i], function, i);
1594 entry[i].flags |=
1595 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1596 ++*nent;
1597 }
1598 break;
1599 }
1600 case 0x80000000:
1601 entry->eax = min(entry->eax, 0x8000001a);
1602 break;
1603 case 0x80000001:
1604 entry->edx &= kvm_supported_word1_x86_features;
1605 entry->ecx &= kvm_supported_word6_x86_features;
1606 break;
1607 }
1608 put_cpu();
1609 }
1610
1611 #undef F
1612
1613 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
1614 struct kvm_cpuid_entry2 __user *entries)
1615 {
1616 struct kvm_cpuid_entry2 *cpuid_entries;
1617 int limit, nent = 0, r = -E2BIG;
1618 u32 func;
1619
1620 if (cpuid->nent < 1)
1621 goto out;
1622 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1623 cpuid->nent = KVM_MAX_CPUID_ENTRIES;
1624 r = -ENOMEM;
1625 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
1626 if (!cpuid_entries)
1627 goto out;
1628
1629 do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
1630 limit = cpuid_entries[0].eax;
1631 for (func = 1; func <= limit && nent < cpuid->nent; ++func)
1632 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1633 &nent, cpuid->nent);
1634 r = -E2BIG;
1635 if (nent >= cpuid->nent)
1636 goto out_free;
1637
1638 do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
1639 limit = cpuid_entries[nent - 1].eax;
1640 for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
1641 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1642 &nent, cpuid->nent);
1643 r = -E2BIG;
1644 if (nent >= cpuid->nent)
1645 goto out_free;
1646
1647 r = -EFAULT;
1648 if (copy_to_user(entries, cpuid_entries,
1649 nent * sizeof(struct kvm_cpuid_entry2)))
1650 goto out_free;
1651 cpuid->nent = nent;
1652 r = 0;
1653
1654 out_free:
1655 vfree(cpuid_entries);
1656 out:
1657 return r;
1658 }
1659
1660 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
1661 struct kvm_lapic_state *s)
1662 {
1663 vcpu_load(vcpu);
1664 memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
1665 vcpu_put(vcpu);
1666
1667 return 0;
1668 }
1669
1670 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
1671 struct kvm_lapic_state *s)
1672 {
1673 vcpu_load(vcpu);
1674 memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1675 kvm_apic_post_state_restore(vcpu);
1676 update_cr8_intercept(vcpu);
1677 vcpu_put(vcpu);
1678
1679 return 0;
1680 }
1681
1682 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1683 struct kvm_interrupt *irq)
1684 {
1685 if (irq->irq < 0 || irq->irq >= 256)
1686 return -EINVAL;
1687 if (irqchip_in_kernel(vcpu->kvm))
1688 return -ENXIO;
1689 vcpu_load(vcpu);
1690
1691 kvm_queue_interrupt(vcpu, irq->irq, false);
1692
1693 vcpu_put(vcpu);
1694
1695 return 0;
1696 }
1697
1698 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
1699 {
1700 vcpu_load(vcpu);
1701 kvm_inject_nmi(vcpu);
1702 vcpu_put(vcpu);
1703
1704 return 0;
1705 }
1706
1707 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
1708 struct kvm_tpr_access_ctl *tac)
1709 {
1710 if (tac->flags)
1711 return -EINVAL;
1712 vcpu->arch.tpr_access_reporting = !!tac->enabled;
1713 return 0;
1714 }
1715
1716 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
1717 u64 mcg_cap)
1718 {
1719 int r;
1720 unsigned bank_num = mcg_cap & 0xff, bank;
1721
1722 r = -EINVAL;
1723 if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
1724 goto out;
1725 if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
1726 goto out;
1727 r = 0;
1728 vcpu->arch.mcg_cap = mcg_cap;
1729 /* Init IA32_MCG_CTL to all 1s */
1730 if (mcg_cap & MCG_CTL_P)
1731 vcpu->arch.mcg_ctl = ~(u64)0;
1732 /* Init IA32_MCi_CTL to all 1s */
1733 for (bank = 0; bank < bank_num; bank++)
1734 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
1735 out:
1736 return r;
1737 }
1738
1739 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
1740 struct kvm_x86_mce *mce)
1741 {
1742 u64 mcg_cap = vcpu->arch.mcg_cap;
1743 unsigned bank_num = mcg_cap & 0xff;
1744 u64 *banks = vcpu->arch.mce_banks;
1745
1746 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
1747 return -EINVAL;
1748 /*
1749 * if IA32_MCG_CTL is not all 1s, the uncorrected error
1750 * reporting is disabled
1751 */
1752 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
1753 vcpu->arch.mcg_ctl != ~(u64)0)
1754 return 0;
1755 banks += 4 * mce->bank;
1756 /*
1757 * if IA32_MCi_CTL is not all 1s, the uncorrected error
1758 * reporting is disabled for the bank
1759 */
1760 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
1761 return 0;
1762 if (mce->status & MCI_STATUS_UC) {
1763 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
1764 !(vcpu->arch.cr4 & X86_CR4_MCE)) {
1765 printk(KERN_DEBUG "kvm: set_mce: "
1766 "injects mce exception while "
1767 "previous one is in progress!\n");
1768 set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
1769 return 0;
1770 }
1771 if (banks[1] & MCI_STATUS_VAL)
1772 mce->status |= MCI_STATUS_OVER;
1773 banks[2] = mce->addr;
1774 banks[3] = mce->misc;
1775 vcpu->arch.mcg_status = mce->mcg_status;
1776 banks[1] = mce->status;
1777 kvm_queue_exception(vcpu, MC_VECTOR);
1778 } else if (!(banks[1] & MCI_STATUS_VAL)
1779 || !(banks[1] & MCI_STATUS_UC)) {
1780 if (banks[1] & MCI_STATUS_VAL)
1781 mce->status |= MCI_STATUS_OVER;
1782 banks[2] = mce->addr;
1783 banks[3] = mce->misc;
1784 banks[1] = mce->status;
1785 } else
1786 banks[1] |= MCI_STATUS_OVER;
1787 return 0;
1788 }
1789
1790 long kvm_arch_vcpu_ioctl(struct file *filp,
1791 unsigned int ioctl, unsigned long arg)
1792 {
1793 struct kvm_vcpu *vcpu = filp->private_data;
1794 void __user *argp = (void __user *)arg;
1795 int r;
1796 struct kvm_lapic_state *lapic = NULL;
1797
1798 switch (ioctl) {
1799 case KVM_GET_LAPIC: {
1800 lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
1801
1802 r = -ENOMEM;
1803 if (!lapic)
1804 goto out;
1805 r = kvm_vcpu_ioctl_get_lapic(vcpu, lapic);
1806 if (r)
1807 goto out;
1808 r = -EFAULT;
1809 if (copy_to_user(argp, lapic, sizeof(struct kvm_lapic_state)))
1810 goto out;
1811 r = 0;
1812 break;
1813 }
1814 case KVM_SET_LAPIC: {
1815 lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
1816 r = -ENOMEM;
1817 if (!lapic)
1818 goto out;
1819 r = -EFAULT;
1820 if (copy_from_user(lapic, argp, sizeof(struct kvm_lapic_state)))
1821 goto out;
1822 r = kvm_vcpu_ioctl_set_lapic(vcpu, lapic);
1823 if (r)
1824 goto out;
1825 r = 0;
1826 break;
1827 }
1828 case KVM_INTERRUPT: {
1829 struct kvm_interrupt irq;
1830
1831 r = -EFAULT;
1832 if (copy_from_user(&irq, argp, sizeof irq))
1833 goto out;
1834 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
1835 if (r)
1836 goto out;
1837 r = 0;
1838 break;
1839 }
1840 case KVM_NMI: {
1841 r = kvm_vcpu_ioctl_nmi(vcpu);
1842 if (r)
1843 goto out;
1844 r = 0;
1845 break;
1846 }
1847 case KVM_SET_CPUID: {
1848 struct kvm_cpuid __user *cpuid_arg = argp;
1849 struct kvm_cpuid cpuid;
1850
1851 r = -EFAULT;
1852 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1853 goto out;
1854 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
1855 if (r)
1856 goto out;
1857 break;
1858 }
1859 case KVM_SET_CPUID2: {
1860 struct kvm_cpuid2 __user *cpuid_arg = argp;
1861 struct kvm_cpuid2 cpuid;
1862
1863 r = -EFAULT;
1864 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1865 goto out;
1866 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
1867 cpuid_arg->entries);
1868 if (r)
1869 goto out;
1870 break;
1871 }
1872 case KVM_GET_CPUID2: {
1873 struct kvm_cpuid2 __user *cpuid_arg = argp;
1874 struct kvm_cpuid2 cpuid;
1875
1876 r = -EFAULT;
1877 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1878 goto out;
1879 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
1880 cpuid_arg->entries);
1881 if (r)
1882 goto out;
1883 r = -EFAULT;
1884 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1885 goto out;
1886 r = 0;
1887 break;
1888 }
1889 case KVM_GET_MSRS:
1890 r = msr_io(vcpu, argp, kvm_get_msr, 1);
1891 break;
1892 case KVM_SET_MSRS:
1893 r = msr_io(vcpu, argp, do_set_msr, 0);
1894 break;
1895 case KVM_TPR_ACCESS_REPORTING: {
1896 struct kvm_tpr_access_ctl tac;
1897
1898 r = -EFAULT;
1899 if (copy_from_user(&tac, argp, sizeof tac))
1900 goto out;
1901 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
1902 if (r)
1903 goto out;
1904 r = -EFAULT;
1905 if (copy_to_user(argp, &tac, sizeof tac))
1906 goto out;
1907 r = 0;
1908 break;
1909 };
1910 case KVM_SET_VAPIC_ADDR: {
1911 struct kvm_vapic_addr va;
1912
1913 r = -EINVAL;
1914 if (!irqchip_in_kernel(vcpu->kvm))
1915 goto out;
1916 r = -EFAULT;
1917 if (copy_from_user(&va, argp, sizeof va))
1918 goto out;
1919 r = 0;
1920 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
1921 break;
1922 }
1923 case KVM_X86_SETUP_MCE: {
1924 u64 mcg_cap;
1925
1926 r = -EFAULT;
1927 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
1928 goto out;
1929 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
1930 break;
1931 }
1932 case KVM_X86_SET_MCE: {
1933 struct kvm_x86_mce mce;
1934
1935 r = -EFAULT;
1936 if (copy_from_user(&mce, argp, sizeof mce))
1937 goto out;
1938 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
1939 break;
1940 }
1941 default:
1942 r = -EINVAL;
1943 }
1944 out:
1945 kfree(lapic);
1946 return r;
1947 }
1948
1949 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
1950 {
1951 int ret;
1952
1953 if (addr > (unsigned int)(-3 * PAGE_SIZE))
1954 return -1;
1955 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
1956 return ret;
1957 }
1958
1959 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
1960 u64 ident_addr)
1961 {
1962 kvm->arch.ept_identity_map_addr = ident_addr;
1963 return 0;
1964 }
1965
1966 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
1967 u32 kvm_nr_mmu_pages)
1968 {
1969 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
1970 return -EINVAL;
1971
1972 down_write(&kvm->slots_lock);
1973 spin_lock(&kvm->mmu_lock);
1974
1975 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1976 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1977
1978 spin_unlock(&kvm->mmu_lock);
1979 up_write(&kvm->slots_lock);
1980 return 0;
1981 }
1982
1983 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
1984 {
1985 return kvm->arch.n_alloc_mmu_pages;
1986 }
1987
1988 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
1989 {
1990 int i;
1991 struct kvm_mem_alias *alias;
1992
1993 for (i = 0; i < kvm->arch.naliases; ++i) {
1994 alias = &kvm->arch.aliases[i];
1995 if (gfn >= alias->base_gfn
1996 && gfn < alias->base_gfn + alias->npages)
1997 return alias->target_gfn + gfn - alias->base_gfn;
1998 }
1999 return gfn;
2000 }
2001
2002 /*
2003 * Set a new alias region. Aliases map a portion of physical memory into
2004 * another portion. This is useful for memory windows, for example the PC
2005 * VGA region.
2006 */
2007 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
2008 struct kvm_memory_alias *alias)
2009 {
2010 int r, n;
2011 struct kvm_mem_alias *p;
2012
2013 r = -EINVAL;
2014 /* General sanity checks */
2015 if (alias->memory_size & (PAGE_SIZE - 1))
2016 goto out;
2017 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
2018 goto out;
2019 if (alias->slot >= KVM_ALIAS_SLOTS)
2020 goto out;
2021 if (alias->guest_phys_addr + alias->memory_size
2022 < alias->guest_phys_addr)
2023 goto out;
2024 if (alias->target_phys_addr + alias->memory_size
2025 < alias->target_phys_addr)
2026 goto out;
2027
2028 down_write(&kvm->slots_lock);
2029 spin_lock(&kvm->mmu_lock);
2030
2031 p = &kvm->arch.aliases[alias->slot];
2032 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
2033 p->npages = alias->memory_size >> PAGE_SHIFT;
2034 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
2035
2036 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
2037 if (kvm->arch.aliases[n - 1].npages)
2038 break;
2039 kvm->arch.naliases = n;
2040
2041 spin_unlock(&kvm->mmu_lock);
2042 kvm_mmu_zap_all(kvm);
2043
2044 up_write(&kvm->slots_lock);
2045
2046 return 0;
2047
2048 out:
2049 return r;
2050 }
2051
2052 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2053 {
2054 int r;
2055
2056 r = 0;
2057 switch (chip->chip_id) {
2058 case KVM_IRQCHIP_PIC_MASTER:
2059 memcpy(&chip->chip.pic,
2060 &pic_irqchip(kvm)->pics[0],
2061 sizeof(struct kvm_pic_state));
2062 break;
2063 case KVM_IRQCHIP_PIC_SLAVE:
2064 memcpy(&chip->chip.pic,
2065 &pic_irqchip(kvm)->pics[1],
2066 sizeof(struct kvm_pic_state));
2067 break;
2068 case KVM_IRQCHIP_IOAPIC:
2069 r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
2070 break;
2071 default:
2072 r = -EINVAL;
2073 break;
2074 }
2075 return r;
2076 }
2077
2078 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2079 {
2080 int r;
2081
2082 r = 0;
2083 switch (chip->chip_id) {
2084 case KVM_IRQCHIP_PIC_MASTER:
2085 spin_lock(&pic_irqchip(kvm)->lock);
2086 memcpy(&pic_irqchip(kvm)->pics[0],
2087 &chip->chip.pic,
2088 sizeof(struct kvm_pic_state));
2089 spin_unlock(&pic_irqchip(kvm)->lock);
2090 break;
2091 case KVM_IRQCHIP_PIC_SLAVE:
2092 spin_lock(&pic_irqchip(kvm)->lock);
2093 memcpy(&pic_irqchip(kvm)->pics[1],
2094 &chip->chip.pic,
2095 sizeof(struct kvm_pic_state));
2096 spin_unlock(&pic_irqchip(kvm)->lock);
2097 break;
2098 case KVM_IRQCHIP_IOAPIC:
2099 r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
2100 break;
2101 default:
2102 r = -EINVAL;
2103 break;
2104 }
2105 kvm_pic_update_irq(pic_irqchip(kvm));
2106 return r;
2107 }
2108
2109 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
2110 {
2111 int r = 0;
2112
2113 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2114 memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
2115 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2116 return r;
2117 }
2118
2119 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
2120 {
2121 int r = 0;
2122
2123 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2124 memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
2125 kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
2126 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2127 return r;
2128 }
2129
2130 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
2131 {
2132 int r = 0;
2133
2134 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2135 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
2136 sizeof(ps->channels));
2137 ps->flags = kvm->arch.vpit->pit_state.flags;
2138 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2139 return r;
2140 }
2141
2142 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
2143 {
2144 int r = 0, start = 0;
2145 u32 prev_legacy, cur_legacy;
2146 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2147 prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
2148 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
2149 if (!prev_legacy && cur_legacy)
2150 start = 1;
2151 memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
2152 sizeof(kvm->arch.vpit->pit_state.channels));
2153 kvm->arch.vpit->pit_state.flags = ps->flags;
2154 kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
2155 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2156 return r;
2157 }
2158
2159 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
2160 struct kvm_reinject_control *control)
2161 {
2162 if (!kvm->arch.vpit)
2163 return -ENXIO;
2164 mutex_lock(&kvm->arch.vpit->pit_state.lock);
2165 kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject;
2166 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2167 return 0;
2168 }
2169
2170 /*
2171 * Get (and clear) the dirty memory log for a memory slot.
2172 */
2173 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
2174 struct kvm_dirty_log *log)
2175 {
2176 int r;
2177 int n;
2178 struct kvm_memory_slot *memslot;
2179 int is_dirty = 0;
2180
2181 down_write(&kvm->slots_lock);
2182
2183 r = kvm_get_dirty_log(kvm, log, &is_dirty);
2184 if (r)
2185 goto out;
2186
2187 /* If nothing is dirty, don't bother messing with page tables. */
2188 if (is_dirty) {
2189 spin_lock(&kvm->mmu_lock);
2190 kvm_mmu_slot_remove_write_access(kvm, log->slot);
2191 spin_unlock(&kvm->mmu_lock);
2192 memslot = &kvm->memslots[log->slot];
2193 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
2194 memset(memslot->dirty_bitmap, 0, n);
2195 }
2196 r = 0;
2197 out:
2198 up_write(&kvm->slots_lock);
2199 return r;
2200 }
2201
2202 long kvm_arch_vm_ioctl(struct file *filp,
2203 unsigned int ioctl, unsigned long arg)
2204 {
2205 struct kvm *kvm = filp->private_data;
2206 void __user *argp = (void __user *)arg;
2207 int r = -ENOTTY;
2208 /*
2209 * This union makes it completely explicit to gcc-3.x
2210 * that these two variables' stack usage should be
2211 * combined, not added together.
2212 */
2213 union {
2214 struct kvm_pit_state ps;
2215 struct kvm_pit_state2 ps2;
2216 struct kvm_memory_alias alias;
2217 struct kvm_pit_config pit_config;
2218 } u;
2219
2220 switch (ioctl) {
2221 case KVM_SET_TSS_ADDR:
2222 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
2223 if (r < 0)
2224 goto out;
2225 break;
2226 case KVM_SET_IDENTITY_MAP_ADDR: {
2227 u64 ident_addr;
2228
2229 r = -EFAULT;
2230 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
2231 goto out;
2232 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
2233 if (r < 0)
2234 goto out;
2235 break;
2236 }
2237 case KVM_SET_MEMORY_REGION: {
2238 struct kvm_memory_region kvm_mem;
2239 struct kvm_userspace_memory_region kvm_userspace_mem;
2240
2241 r = -EFAULT;
2242 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
2243 goto out;
2244 kvm_userspace_mem.slot = kvm_mem.slot;
2245 kvm_userspace_mem.flags = kvm_mem.flags;
2246 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
2247 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
2248 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
2249 if (r)
2250 goto out;
2251 break;
2252 }
2253 case KVM_SET_NR_MMU_PAGES:
2254 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
2255 if (r)
2256 goto out;
2257 break;
2258 case KVM_GET_NR_MMU_PAGES:
2259 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
2260 break;
2261 case KVM_SET_MEMORY_ALIAS:
2262 r = -EFAULT;
2263 if (copy_from_user(&u.alias, argp, sizeof(struct kvm_memory_alias)))
2264 goto out;
2265 r = kvm_vm_ioctl_set_memory_alias(kvm, &u.alias);
2266 if (r)
2267 goto out;
2268 break;
2269 case KVM_CREATE_IRQCHIP:
2270 r = -ENOMEM;
2271 kvm->arch.vpic = kvm_create_pic(kvm);
2272 if (kvm->arch.vpic) {
2273 r = kvm_ioapic_init(kvm);
2274 if (r) {
2275 kfree(kvm->arch.vpic);
2276 kvm->arch.vpic = NULL;
2277 goto out;
2278 }
2279 } else
2280 goto out;
2281 r = kvm_setup_default_irq_routing(kvm);
2282 if (r) {
2283 kfree(kvm->arch.vpic);
2284 kfree(kvm->arch.vioapic);
2285 goto out;
2286 }
2287 break;
2288 case KVM_CREATE_PIT:
2289 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
2290 goto create_pit;
2291 case KVM_CREATE_PIT2:
2292 r = -EFAULT;
2293 if (copy_from_user(&u.pit_config, argp,
2294 sizeof(struct kvm_pit_config)))
2295 goto out;
2296 create_pit:
2297 down_write(&kvm->slots_lock);
2298 r = -EEXIST;
2299 if (kvm->arch.vpit)
2300 goto create_pit_unlock;
2301 r = -ENOMEM;
2302 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
2303 if (kvm->arch.vpit)
2304 r = 0;
2305 create_pit_unlock:
2306 up_write(&kvm->slots_lock);
2307 break;
2308 case KVM_IRQ_LINE_STATUS:
2309 case KVM_IRQ_LINE: {
2310 struct kvm_irq_level irq_event;
2311
2312 r = -EFAULT;
2313 if (copy_from_user(&irq_event, argp, sizeof irq_event))
2314 goto out;
2315 if (irqchip_in_kernel(kvm)) {
2316 __s32 status;
2317 status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
2318 irq_event.irq, irq_event.level);
2319 if (ioctl == KVM_IRQ_LINE_STATUS) {
2320 irq_event.status = status;
2321 if (copy_to_user(argp, &irq_event,
2322 sizeof irq_event))
2323 goto out;
2324 }
2325 r = 0;
2326 }
2327 break;
2328 }
2329 case KVM_GET_IRQCHIP: {
2330 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
2331 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
2332
2333 r = -ENOMEM;
2334 if (!chip)
2335 goto out;
2336 r = -EFAULT;
2337 if (copy_from_user(chip, argp, sizeof *chip))
2338 goto get_irqchip_out;
2339 r = -ENXIO;
2340 if (!irqchip_in_kernel(kvm))
2341 goto get_irqchip_out;
2342 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
2343 if (r)
2344 goto get_irqchip_out;
2345 r = -EFAULT;
2346 if (copy_to_user(argp, chip, sizeof *chip))
2347 goto get_irqchip_out;
2348 r = 0;
2349 get_irqchip_out:
2350 kfree(chip);
2351 if (r)
2352 goto out;
2353 break;
2354 }
2355 case KVM_SET_IRQCHIP: {
2356 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
2357 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
2358
2359 r = -ENOMEM;
2360 if (!chip)
2361 goto out;
2362 r = -EFAULT;
2363 if (copy_from_user(chip, argp, sizeof *chip))
2364 goto set_irqchip_out;
2365 r = -ENXIO;
2366 if (!irqchip_in_kernel(kvm))
2367 goto set_irqchip_out;
2368 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
2369 if (r)
2370 goto set_irqchip_out;
2371 r = 0;
2372 set_irqchip_out:
2373 kfree(chip);
2374 if (r)
2375 goto out;
2376 break;
2377 }
2378 case KVM_GET_PIT: {
2379 r = -EFAULT;
2380 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
2381 goto out;
2382 r = -ENXIO;
2383 if (!kvm->arch.vpit)
2384 goto out;
2385 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
2386 if (r)
2387 goto out;
2388 r = -EFAULT;
2389 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
2390 goto out;
2391 r = 0;
2392 break;
2393 }
2394 case KVM_SET_PIT: {
2395 r = -EFAULT;
2396 if (copy_from_user(&u.ps, argp, sizeof u.ps))
2397 goto out;
2398 r = -ENXIO;
2399 if (!kvm->arch.vpit)
2400 goto out;
2401 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
2402 if (r)
2403 goto out;
2404 r = 0;
2405 break;
2406 }
2407 case KVM_GET_PIT2: {
2408 r = -ENXIO;
2409 if (!kvm->arch.vpit)
2410 goto out;
2411 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
2412 if (r)
2413 goto out;
2414 r = -EFAULT;
2415 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
2416 goto out;
2417 r = 0;
2418 break;
2419 }
2420 case KVM_SET_PIT2: {
2421 r = -EFAULT;
2422 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
2423 goto out;
2424 r = -ENXIO;
2425 if (!kvm->arch.vpit)
2426 goto out;
2427 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
2428 if (r)
2429 goto out;
2430 r = 0;
2431 break;
2432 }
2433 case KVM_REINJECT_CONTROL: {
2434 struct kvm_reinject_control control;
2435 r = -EFAULT;
2436 if (copy_from_user(&control, argp, sizeof(control)))
2437 goto out;
2438 r = kvm_vm_ioctl_reinject(kvm, &control);
2439 if (r)
2440 goto out;
2441 r = 0;
2442 break;
2443 }
2444 default:
2445 ;
2446 }
2447 out:
2448 return r;
2449 }
2450
2451 static void kvm_init_msr_list(void)
2452 {
2453 u32 dummy[2];
2454 unsigned i, j;
2455
2456 /* skip the first msrs in the list. KVM-specific */
2457 for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) {
2458 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2459 continue;
2460 if (j < i)
2461 msrs_to_save[j] = msrs_to_save[i];
2462 j++;
2463 }
2464 num_msrs_to_save = j;
2465 }
2466
2467 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
2468 const void *v)
2469 {
2470 if (vcpu->arch.apic &&
2471 !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, len, v))
2472 return 0;
2473
2474 return kvm_io_bus_write(&vcpu->kvm->mmio_bus, addr, len, v);
2475 }
2476
2477 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
2478 {
2479 if (vcpu->arch.apic &&
2480 !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, len, v))
2481 return 0;
2482
2483 return kvm_io_bus_read(&vcpu->kvm->mmio_bus, addr, len, v);
2484 }
2485
2486 static int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
2487 struct kvm_vcpu *vcpu)
2488 {
2489 void *data = val;
2490 int r = X86EMUL_CONTINUE;
2491
2492 while (bytes) {
2493 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2494 unsigned offset = addr & (PAGE_SIZE-1);
2495 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
2496 int ret;
2497
2498 if (gpa == UNMAPPED_GVA) {
2499 r = X86EMUL_PROPAGATE_FAULT;
2500 goto out;
2501 }
2502 ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
2503 if (ret < 0) {
2504 r = X86EMUL_UNHANDLEABLE;
2505 goto out;
2506 }
2507
2508 bytes -= toread;
2509 data += toread;
2510 addr += toread;
2511 }
2512 out:
2513 return r;
2514 }
2515
2516 static int kvm_write_guest_virt(gva_t addr, void *val, unsigned int bytes,
2517 struct kvm_vcpu *vcpu)
2518 {
2519 void *data = val;
2520 int r = X86EMUL_CONTINUE;
2521
2522 while (bytes) {
2523 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2524 unsigned offset = addr & (PAGE_SIZE-1);
2525 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
2526 int ret;
2527
2528 if (gpa == UNMAPPED_GVA) {
2529 r = X86EMUL_PROPAGATE_FAULT;
2530 goto out;
2531 }
2532 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
2533 if (ret < 0) {
2534 r = X86EMUL_UNHANDLEABLE;
2535 goto out;
2536 }
2537
2538 bytes -= towrite;
2539 data += towrite;
2540 addr += towrite;
2541 }
2542 out:
2543 return r;
2544 }
2545
2546
2547 static int emulator_read_emulated(unsigned long addr,
2548 void *val,
2549 unsigned int bytes,
2550 struct kvm_vcpu *vcpu)
2551 {
2552 gpa_t gpa;
2553
2554 if (vcpu->mmio_read_completed) {
2555 memcpy(val, vcpu->mmio_data, bytes);
2556 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
2557 vcpu->mmio_phys_addr, *(u64 *)val);
2558 vcpu->mmio_read_completed = 0;
2559 return X86EMUL_CONTINUE;
2560 }
2561
2562 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2563
2564 /* For APIC access vmexit */
2565 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2566 goto mmio;
2567
2568 if (kvm_read_guest_virt(addr, val, bytes, vcpu)
2569 == X86EMUL_CONTINUE)
2570 return X86EMUL_CONTINUE;
2571 if (gpa == UNMAPPED_GVA)
2572 return X86EMUL_PROPAGATE_FAULT;
2573
2574 mmio:
2575 /*
2576 * Is this MMIO handled locally?
2577 */
2578 if (!vcpu_mmio_read(vcpu, gpa, bytes, val)) {
2579 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, gpa, *(u64 *)val);
2580 return X86EMUL_CONTINUE;
2581 }
2582
2583 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
2584
2585 vcpu->mmio_needed = 1;
2586 vcpu->mmio_phys_addr = gpa;
2587 vcpu->mmio_size = bytes;
2588 vcpu->mmio_is_write = 0;
2589
2590 return X86EMUL_UNHANDLEABLE;
2591 }
2592
2593 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
2594 const void *val, int bytes)
2595 {
2596 int ret;
2597
2598 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
2599 if (ret < 0)
2600 return 0;
2601 kvm_mmu_pte_write(vcpu, gpa, val, bytes, 1);
2602 return 1;
2603 }
2604
2605 static int emulator_write_emulated_onepage(unsigned long addr,
2606 const void *val,
2607 unsigned int bytes,
2608 struct kvm_vcpu *vcpu)
2609 {
2610 gpa_t gpa;
2611
2612 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2613
2614 if (gpa == UNMAPPED_GVA) {
2615 kvm_inject_page_fault(vcpu, addr, 2);
2616 return X86EMUL_PROPAGATE_FAULT;
2617 }
2618
2619 /* For APIC access vmexit */
2620 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2621 goto mmio;
2622
2623 if (emulator_write_phys(vcpu, gpa, val, bytes))
2624 return X86EMUL_CONTINUE;
2625
2626 mmio:
2627 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
2628 /*
2629 * Is this MMIO handled locally?
2630 */
2631 if (!vcpu_mmio_write(vcpu, gpa, bytes, val))
2632 return X86EMUL_CONTINUE;
2633
2634 vcpu->mmio_needed = 1;
2635 vcpu->mmio_phys_addr = gpa;
2636 vcpu->mmio_size = bytes;
2637 vcpu->mmio_is_write = 1;
2638 memcpy(vcpu->mmio_data, val, bytes);
2639
2640 return X86EMUL_CONTINUE;
2641 }
2642
2643 int emulator_write_emulated(unsigned long addr,
2644 const void *val,
2645 unsigned int bytes,
2646 struct kvm_vcpu *vcpu)
2647 {
2648 /* Crossing a page boundary? */
2649 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
2650 int rc, now;
2651
2652 now = -addr & ~PAGE_MASK;
2653 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
2654 if (rc != X86EMUL_CONTINUE)
2655 return rc;
2656 addr += now;
2657 val += now;
2658 bytes -= now;
2659 }
2660 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
2661 }
2662 EXPORT_SYMBOL_GPL(emulator_write_emulated);
2663
2664 static int emulator_cmpxchg_emulated(unsigned long addr,
2665 const void *old,
2666 const void *new,
2667 unsigned int bytes,
2668 struct kvm_vcpu *vcpu)
2669 {
2670 printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
2671 #ifndef CONFIG_X86_64
2672 /* guests cmpxchg8b have to be emulated atomically */
2673 if (bytes == 8) {
2674 gpa_t gpa;
2675 struct page *page;
2676 char *kaddr;
2677 u64 val;
2678
2679 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2680
2681 if (gpa == UNMAPPED_GVA ||
2682 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2683 goto emul_write;
2684
2685 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
2686 goto emul_write;
2687
2688 val = *(u64 *)new;
2689
2690 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
2691
2692 kaddr = kmap_atomic(page, KM_USER0);
2693 set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
2694 kunmap_atomic(kaddr, KM_USER0);
2695 kvm_release_page_dirty(page);
2696 }
2697 emul_write:
2698 #endif
2699
2700 return emulator_write_emulated(addr, new, bytes, vcpu);
2701 }
2702
2703 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
2704 {
2705 return kvm_x86_ops->get_segment_base(vcpu, seg);
2706 }
2707
2708 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
2709 {
2710 kvm_mmu_invlpg(vcpu, address);
2711 return X86EMUL_CONTINUE;
2712 }
2713
2714 int emulate_clts(struct kvm_vcpu *vcpu)
2715 {
2716 kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
2717 return X86EMUL_CONTINUE;
2718 }
2719
2720 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
2721 {
2722 struct kvm_vcpu *vcpu = ctxt->vcpu;
2723
2724 switch (dr) {
2725 case 0 ... 3:
2726 *dest = kvm_x86_ops->get_dr(vcpu, dr);
2727 return X86EMUL_CONTINUE;
2728 default:
2729 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __func__, dr);
2730 return X86EMUL_UNHANDLEABLE;
2731 }
2732 }
2733
2734 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
2735 {
2736 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
2737 int exception;
2738
2739 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
2740 if (exception) {
2741 /* FIXME: better handling */
2742 return X86EMUL_UNHANDLEABLE;
2743 }
2744 return X86EMUL_CONTINUE;
2745 }
2746
2747 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
2748 {
2749 u8 opcodes[4];
2750 unsigned long rip = kvm_rip_read(vcpu);
2751 unsigned long rip_linear;
2752
2753 if (!printk_ratelimit())
2754 return;
2755
2756 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
2757
2758 kvm_read_guest_virt(rip_linear, (void *)opcodes, 4, vcpu);
2759
2760 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
2761 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
2762 }
2763 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
2764
2765 static struct x86_emulate_ops emulate_ops = {
2766 .read_std = kvm_read_guest_virt,
2767 .read_emulated = emulator_read_emulated,
2768 .write_emulated = emulator_write_emulated,
2769 .cmpxchg_emulated = emulator_cmpxchg_emulated,
2770 };
2771
2772 static void cache_all_regs(struct kvm_vcpu *vcpu)
2773 {
2774 kvm_register_read(vcpu, VCPU_REGS_RAX);
2775 kvm_register_read(vcpu, VCPU_REGS_RSP);
2776 kvm_register_read(vcpu, VCPU_REGS_RIP);
2777 vcpu->arch.regs_dirty = ~0;
2778 }
2779
2780 int emulate_instruction(struct kvm_vcpu *vcpu,
2781 unsigned long cr2,
2782 u16 error_code,
2783 int emulation_type)
2784 {
2785 int r, shadow_mask;
2786 struct decode_cache *c;
2787 struct kvm_run *run = vcpu->run;
2788
2789 kvm_clear_exception_queue(vcpu);
2790 vcpu->arch.mmio_fault_cr2 = cr2;
2791 /*
2792 * TODO: fix emulate.c to use guest_read/write_register
2793 * instead of direct ->regs accesses, can save hundred cycles
2794 * on Intel for instructions that don't read/change RSP, for
2795 * for example.
2796 */
2797 cache_all_regs(vcpu);
2798
2799 vcpu->mmio_is_write = 0;
2800 vcpu->arch.pio.string = 0;
2801
2802 if (!(emulation_type & EMULTYPE_NO_DECODE)) {
2803 int cs_db, cs_l;
2804 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
2805
2806 vcpu->arch.emulate_ctxt.vcpu = vcpu;
2807 vcpu->arch.emulate_ctxt.eflags = kvm_get_rflags(vcpu);
2808 vcpu->arch.emulate_ctxt.mode =
2809 (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
2810 ? X86EMUL_MODE_REAL : cs_l
2811 ? X86EMUL_MODE_PROT64 : cs_db
2812 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
2813
2814 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2815
2816 /* Only allow emulation of specific instructions on #UD
2817 * (namely VMMCALL, sysenter, sysexit, syscall)*/
2818 c = &vcpu->arch.emulate_ctxt.decode;
2819 if (emulation_type & EMULTYPE_TRAP_UD) {
2820 if (!c->twobyte)
2821 return EMULATE_FAIL;
2822 switch (c->b) {
2823 case 0x01: /* VMMCALL */
2824 if (c->modrm_mod != 3 || c->modrm_rm != 1)
2825 return EMULATE_FAIL;
2826 break;
2827 case 0x34: /* sysenter */
2828 case 0x35: /* sysexit */
2829 if (c->modrm_mod != 0 || c->modrm_rm != 0)
2830 return EMULATE_FAIL;
2831 break;
2832 case 0x05: /* syscall */
2833 if (c->modrm_mod != 0 || c->modrm_rm != 0)
2834 return EMULATE_FAIL;
2835 break;
2836 default:
2837 return EMULATE_FAIL;
2838 }
2839
2840 if (!(c->modrm_reg == 0 || c->modrm_reg == 3))
2841 return EMULATE_FAIL;
2842 }
2843
2844 ++vcpu->stat.insn_emulation;
2845 if (r) {
2846 ++vcpu->stat.insn_emulation_fail;
2847 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2848 return EMULATE_DONE;
2849 return EMULATE_FAIL;
2850 }
2851 }
2852
2853 if (emulation_type & EMULTYPE_SKIP) {
2854 kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.decode.eip);
2855 return EMULATE_DONE;
2856 }
2857
2858 r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2859 shadow_mask = vcpu->arch.emulate_ctxt.interruptibility;
2860
2861 if (r == 0)
2862 kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask);
2863
2864 if (vcpu->arch.pio.string)
2865 return EMULATE_DO_MMIO;
2866
2867 if ((r || vcpu->mmio_is_write) && run) {
2868 run->exit_reason = KVM_EXIT_MMIO;
2869 run->mmio.phys_addr = vcpu->mmio_phys_addr;
2870 memcpy(run->mmio.data, vcpu->mmio_data, 8);
2871 run->mmio.len = vcpu->mmio_size;
2872 run->mmio.is_write = vcpu->mmio_is_write;
2873 }
2874
2875 if (r) {
2876 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2877 return EMULATE_DONE;
2878 if (!vcpu->mmio_needed) {
2879 kvm_report_emulation_failure(vcpu, "mmio");
2880 return EMULATE_FAIL;
2881 }
2882 return EMULATE_DO_MMIO;
2883 }
2884
2885 kvm_set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
2886
2887 if (vcpu->mmio_is_write) {
2888 vcpu->mmio_needed = 0;
2889 return EMULATE_DO_MMIO;
2890 }
2891
2892 return EMULATE_DONE;
2893 }
2894 EXPORT_SYMBOL_GPL(emulate_instruction);
2895
2896 static int pio_copy_data(struct kvm_vcpu *vcpu)
2897 {
2898 void *p = vcpu->arch.pio_data;
2899 gva_t q = vcpu->arch.pio.guest_gva;
2900 unsigned bytes;
2901 int ret;
2902
2903 bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
2904 if (vcpu->arch.pio.in)
2905 ret = kvm_write_guest_virt(q, p, bytes, vcpu);
2906 else
2907 ret = kvm_read_guest_virt(q, p, bytes, vcpu);
2908 return ret;
2909 }
2910
2911 int complete_pio(struct kvm_vcpu *vcpu)
2912 {
2913 struct kvm_pio_request *io = &vcpu->arch.pio;
2914 long delta;
2915 int r;
2916 unsigned long val;
2917
2918 if (!io->string) {
2919 if (io->in) {
2920 val = kvm_register_read(vcpu, VCPU_REGS_RAX);
2921 memcpy(&val, vcpu->arch.pio_data, io->size);
2922 kvm_register_write(vcpu, VCPU_REGS_RAX, val);
2923 }
2924 } else {
2925 if (io->in) {
2926 r = pio_copy_data(vcpu);
2927 if (r)
2928 return r;
2929 }
2930
2931 delta = 1;
2932 if (io->rep) {
2933 delta *= io->cur_count;
2934 /*
2935 * The size of the register should really depend on
2936 * current address size.
2937 */
2938 val = kvm_register_read(vcpu, VCPU_REGS_RCX);
2939 val -= delta;
2940 kvm_register_write(vcpu, VCPU_REGS_RCX, val);
2941 }
2942 if (io->down)
2943 delta = -delta;
2944 delta *= io->size;
2945 if (io->in) {
2946 val = kvm_register_read(vcpu, VCPU_REGS_RDI);
2947 val += delta;
2948 kvm_register_write(vcpu, VCPU_REGS_RDI, val);
2949 } else {
2950 val = kvm_register_read(vcpu, VCPU_REGS_RSI);
2951 val += delta;
2952 kvm_register_write(vcpu, VCPU_REGS_RSI, val);
2953 }
2954 }
2955
2956 io->count -= io->cur_count;
2957 io->cur_count = 0;
2958
2959 return 0;
2960 }
2961
2962 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
2963 {
2964 /* TODO: String I/O for in kernel device */
2965 int r;
2966
2967 if (vcpu->arch.pio.in)
2968 r = kvm_io_bus_read(&vcpu->kvm->pio_bus, vcpu->arch.pio.port,
2969 vcpu->arch.pio.size, pd);
2970 else
2971 r = kvm_io_bus_write(&vcpu->kvm->pio_bus, vcpu->arch.pio.port,
2972 vcpu->arch.pio.size, pd);
2973 return r;
2974 }
2975
2976 static int pio_string_write(struct kvm_vcpu *vcpu)
2977 {
2978 struct kvm_pio_request *io = &vcpu->arch.pio;
2979 void *pd = vcpu->arch.pio_data;
2980 int i, r = 0;
2981
2982 for (i = 0; i < io->cur_count; i++) {
2983 if (kvm_io_bus_write(&vcpu->kvm->pio_bus,
2984 io->port, io->size, pd)) {
2985 r = -EOPNOTSUPP;
2986 break;
2987 }
2988 pd += io->size;
2989 }
2990 return r;
2991 }
2992
2993 int kvm_emulate_pio(struct kvm_vcpu *vcpu, int in, int size, unsigned port)
2994 {
2995 unsigned long val;
2996
2997 vcpu->run->exit_reason = KVM_EXIT_IO;
2998 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2999 vcpu->run->io.size = vcpu->arch.pio.size = size;
3000 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
3001 vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1;
3002 vcpu->run->io.port = vcpu->arch.pio.port = port;
3003 vcpu->arch.pio.in = in;
3004 vcpu->arch.pio.string = 0;
3005 vcpu->arch.pio.down = 0;
3006 vcpu->arch.pio.rep = 0;
3007
3008 trace_kvm_pio(vcpu->run->io.direction == KVM_EXIT_IO_OUT, port,
3009 size, 1);
3010
3011 val = kvm_register_read(vcpu, VCPU_REGS_RAX);
3012 memcpy(vcpu->arch.pio_data, &val, 4);
3013
3014 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
3015 complete_pio(vcpu);
3016 return 1;
3017 }
3018 return 0;
3019 }
3020 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
3021
3022 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, int in,
3023 int size, unsigned long count, int down,
3024 gva_t address, int rep, unsigned port)
3025 {
3026 unsigned now, in_page;
3027 int ret = 0;
3028
3029 vcpu->run->exit_reason = KVM_EXIT_IO;
3030 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
3031 vcpu->run->io.size = vcpu->arch.pio.size = size;
3032 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
3033 vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count;
3034 vcpu->run->io.port = vcpu->arch.pio.port = port;
3035 vcpu->arch.pio.in = in;
3036 vcpu->arch.pio.string = 1;
3037 vcpu->arch.pio.down = down;
3038 vcpu->arch.pio.rep = rep;
3039
3040 trace_kvm_pio(vcpu->run->io.direction == KVM_EXIT_IO_OUT, port,
3041 size, count);
3042
3043 if (!count) {
3044 kvm_x86_ops->skip_emulated_instruction(vcpu);
3045 return 1;
3046 }
3047
3048 if (!down)
3049 in_page = PAGE_SIZE - offset_in_page(address);
3050 else
3051 in_page = offset_in_page(address) + size;
3052 now = min(count, (unsigned long)in_page / size);
3053 if (!now)
3054 now = 1;
3055 if (down) {
3056 /*
3057 * String I/O in reverse. Yuck. Kill the guest, fix later.
3058 */
3059 pr_unimpl(vcpu, "guest string pio down\n");
3060 kvm_inject_gp(vcpu, 0);
3061 return 1;
3062 }
3063 vcpu->run->io.count = now;
3064 vcpu->arch.pio.cur_count = now;
3065
3066 if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
3067 kvm_x86_ops->skip_emulated_instruction(vcpu);
3068
3069 vcpu->arch.pio.guest_gva = address;
3070
3071 if (!vcpu->arch.pio.in) {
3072 /* string PIO write */
3073 ret = pio_copy_data(vcpu);
3074 if (ret == X86EMUL_PROPAGATE_FAULT) {
3075 kvm_inject_gp(vcpu, 0);
3076 return 1;
3077 }
3078 if (ret == 0 && !pio_string_write(vcpu)) {
3079 complete_pio(vcpu);
3080 if (vcpu->arch.pio.count == 0)
3081 ret = 1;
3082 }
3083 }
3084 /* no string PIO read support yet */
3085
3086 return ret;
3087 }
3088 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
3089
3090 static void bounce_off(void *info)
3091 {
3092 /* nothing */
3093 }
3094
3095 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
3096 void *data)
3097 {
3098 struct cpufreq_freqs *freq = data;
3099 struct kvm *kvm;
3100 struct kvm_vcpu *vcpu;
3101 int i, send_ipi = 0;
3102
3103 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
3104 return 0;
3105 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
3106 return 0;
3107 per_cpu(cpu_tsc_khz, freq->cpu) = freq->new;
3108
3109 spin_lock(&kvm_lock);
3110 list_for_each_entry(kvm, &vm_list, vm_list) {
3111 kvm_for_each_vcpu(i, vcpu, kvm) {
3112 if (vcpu->cpu != freq->cpu)
3113 continue;
3114 if (!kvm_request_guest_time_update(vcpu))
3115 continue;
3116 if (vcpu->cpu != smp_processor_id())
3117 send_ipi++;
3118 }
3119 }
3120 spin_unlock(&kvm_lock);
3121
3122 if (freq->old < freq->new && send_ipi) {
3123 /*
3124 * We upscale the frequency. Must make the guest
3125 * doesn't see old kvmclock values while running with
3126 * the new frequency, otherwise we risk the guest sees
3127 * time go backwards.
3128 *
3129 * In case we update the frequency for another cpu
3130 * (which might be in guest context) send an interrupt
3131 * to kick the cpu out of guest context. Next time
3132 * guest context is entered kvmclock will be updated,
3133 * so the guest will not see stale values.
3134 */
3135 smp_call_function_single(freq->cpu, bounce_off, NULL, 1);
3136 }
3137 return 0;
3138 }
3139
3140 static struct notifier_block kvmclock_cpufreq_notifier_block = {
3141 .notifier_call = kvmclock_cpufreq_notifier
3142 };
3143
3144 static void kvm_timer_init(void)
3145 {
3146 int cpu;
3147
3148 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
3149 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
3150 CPUFREQ_TRANSITION_NOTIFIER);
3151 for_each_online_cpu(cpu) {
3152 unsigned long khz = cpufreq_get(cpu);
3153 if (!khz)
3154 khz = tsc_khz;
3155 per_cpu(cpu_tsc_khz, cpu) = khz;
3156 }
3157 } else {
3158 for_each_possible_cpu(cpu)
3159 per_cpu(cpu_tsc_khz, cpu) = tsc_khz;
3160 }
3161 }
3162
3163 int kvm_arch_init(void *opaque)
3164 {
3165 int r;
3166 struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
3167
3168 if (kvm_x86_ops) {
3169 printk(KERN_ERR "kvm: already loaded the other module\n");
3170 r = -EEXIST;
3171 goto out;
3172 }
3173
3174 if (!ops->cpu_has_kvm_support()) {
3175 printk(KERN_ERR "kvm: no hardware support\n");
3176 r = -EOPNOTSUPP;
3177 goto out;
3178 }
3179 if (ops->disabled_by_bios()) {
3180 printk(KERN_ERR "kvm: disabled by bios\n");
3181 r = -EOPNOTSUPP;
3182 goto out;
3183 }
3184
3185 r = kvm_mmu_module_init();
3186 if (r)
3187 goto out;
3188
3189 kvm_init_msr_list();
3190
3191 kvm_x86_ops = ops;
3192 kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
3193 kvm_mmu_set_base_ptes(PT_PRESENT_MASK);
3194 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
3195 PT_DIRTY_MASK, PT64_NX_MASK, 0);
3196
3197 kvm_timer_init();
3198
3199 return 0;
3200
3201 out:
3202 return r;
3203 }
3204
3205 void kvm_arch_exit(void)
3206 {
3207 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
3208 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
3209 CPUFREQ_TRANSITION_NOTIFIER);
3210 kvm_x86_ops = NULL;
3211 kvm_mmu_module_exit();
3212 }
3213
3214 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
3215 {
3216 ++vcpu->stat.halt_exits;
3217 if (irqchip_in_kernel(vcpu->kvm)) {
3218 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
3219 return 1;
3220 } else {
3221 vcpu->run->exit_reason = KVM_EXIT_HLT;
3222 return 0;
3223 }
3224 }
3225 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
3226
3227 static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
3228 unsigned long a1)
3229 {
3230 if (is_long_mode(vcpu))
3231 return a0;
3232 else
3233 return a0 | ((gpa_t)a1 << 32);
3234 }
3235
3236 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
3237 {
3238 unsigned long nr, a0, a1, a2, a3, ret;
3239 int r = 1;
3240
3241 nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
3242 a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
3243 a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
3244 a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
3245 a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
3246
3247 trace_kvm_hypercall(nr, a0, a1, a2, a3);
3248
3249 if (!is_long_mode(vcpu)) {
3250 nr &= 0xFFFFFFFF;
3251 a0 &= 0xFFFFFFFF;
3252 a1 &= 0xFFFFFFFF;
3253 a2 &= 0xFFFFFFFF;
3254 a3 &= 0xFFFFFFFF;
3255 }
3256
3257 if (kvm_x86_ops->get_cpl(vcpu) != 0) {
3258 ret = -KVM_EPERM;
3259 goto out;
3260 }
3261
3262 switch (nr) {
3263 case KVM_HC_VAPIC_POLL_IRQ:
3264 ret = 0;
3265 break;
3266 case KVM_HC_MMU_OP:
3267 r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
3268 break;
3269 default:
3270 ret = -KVM_ENOSYS;
3271 break;
3272 }
3273 out:
3274 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
3275 ++vcpu->stat.hypercalls;
3276 return r;
3277 }
3278 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
3279
3280 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
3281 {
3282 char instruction[3];
3283 int ret = 0;
3284 unsigned long rip = kvm_rip_read(vcpu);
3285
3286
3287 /*
3288 * Blow out the MMU to ensure that no other VCPU has an active mapping
3289 * to ensure that the updated hypercall appears atomically across all
3290 * VCPUs.
3291 */
3292 kvm_mmu_zap_all(vcpu->kvm);
3293
3294 kvm_x86_ops->patch_hypercall(vcpu, instruction);
3295 if (emulator_write_emulated(rip, instruction, 3, vcpu)
3296 != X86EMUL_CONTINUE)
3297 ret = -EFAULT;
3298
3299 return ret;
3300 }
3301
3302 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
3303 {
3304 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
3305 }
3306
3307 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
3308 {
3309 struct descriptor_table dt = { limit, base };
3310
3311 kvm_x86_ops->set_gdt(vcpu, &dt);
3312 }
3313
3314 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
3315 {
3316 struct descriptor_table dt = { limit, base };
3317
3318 kvm_x86_ops->set_idt(vcpu, &dt);
3319 }
3320
3321 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
3322 unsigned long *rflags)
3323 {
3324 kvm_lmsw(vcpu, msw);
3325 *rflags = kvm_get_rflags(vcpu);
3326 }
3327
3328 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
3329 {
3330 unsigned long value;
3331
3332 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3333 switch (cr) {
3334 case 0:
3335 value = vcpu->arch.cr0;
3336 break;
3337 case 2:
3338 value = vcpu->arch.cr2;
3339 break;
3340 case 3:
3341 value = vcpu->arch.cr3;
3342 break;
3343 case 4:
3344 value = vcpu->arch.cr4;
3345 break;
3346 case 8:
3347 value = kvm_get_cr8(vcpu);
3348 break;
3349 default:
3350 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
3351 return 0;
3352 }
3353
3354 return value;
3355 }
3356
3357 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
3358 unsigned long *rflags)
3359 {
3360 switch (cr) {
3361 case 0:
3362 kvm_set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
3363 *rflags = kvm_get_rflags(vcpu);
3364 break;
3365 case 2:
3366 vcpu->arch.cr2 = val;
3367 break;
3368 case 3:
3369 kvm_set_cr3(vcpu, val);
3370 break;
3371 case 4:
3372 kvm_set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
3373 break;
3374 case 8:
3375 kvm_set_cr8(vcpu, val & 0xfUL);
3376 break;
3377 default:
3378 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
3379 }
3380 }
3381
3382 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
3383 {
3384 struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
3385 int j, nent = vcpu->arch.cpuid_nent;
3386
3387 e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
3388 /* when no next entry is found, the current entry[i] is reselected */
3389 for (j = i + 1; ; j = (j + 1) % nent) {
3390 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
3391 if (ej->function == e->function) {
3392 ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
3393 return j;
3394 }
3395 }
3396 return 0; /* silence gcc, even though control never reaches here */
3397 }
3398
3399 /* find an entry with matching function, matching index (if needed), and that
3400 * should be read next (if it's stateful) */
3401 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
3402 u32 function, u32 index)
3403 {
3404 if (e->function != function)
3405 return 0;
3406 if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
3407 return 0;
3408 if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
3409 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
3410 return 0;
3411 return 1;
3412 }
3413
3414 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
3415 u32 function, u32 index)
3416 {
3417 int i;
3418 struct kvm_cpuid_entry2 *best = NULL;
3419
3420 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
3421 struct kvm_cpuid_entry2 *e;
3422
3423 e = &vcpu->arch.cpuid_entries[i];
3424 if (is_matching_cpuid_entry(e, function, index)) {
3425 if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
3426 move_to_next_stateful_cpuid_entry(vcpu, i);
3427 best = e;
3428 break;
3429 }
3430 /*
3431 * Both basic or both extended?
3432 */
3433 if (((e->function ^ function) & 0x80000000) == 0)
3434 if (!best || e->function > best->function)
3435 best = e;
3436 }
3437 return best;
3438 }
3439
3440 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
3441 {
3442 struct kvm_cpuid_entry2 *best;
3443
3444 best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
3445 if (best)
3446 return best->eax & 0xff;
3447 return 36;
3448 }
3449
3450 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
3451 {
3452 u32 function, index;
3453 struct kvm_cpuid_entry2 *best;
3454
3455 function = kvm_register_read(vcpu, VCPU_REGS_RAX);
3456 index = kvm_register_read(vcpu, VCPU_REGS_RCX);
3457 kvm_register_write(vcpu, VCPU_REGS_RAX, 0);
3458 kvm_register_write(vcpu, VCPU_REGS_RBX, 0);
3459 kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
3460 kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
3461 best = kvm_find_cpuid_entry(vcpu, function, index);
3462 if (best) {
3463 kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
3464 kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
3465 kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx);
3466 kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx);
3467 }
3468 kvm_x86_ops->skip_emulated_instruction(vcpu);
3469 trace_kvm_cpuid(function,
3470 kvm_register_read(vcpu, VCPU_REGS_RAX),
3471 kvm_register_read(vcpu, VCPU_REGS_RBX),
3472 kvm_register_read(vcpu, VCPU_REGS_RCX),
3473 kvm_register_read(vcpu, VCPU_REGS_RDX));
3474 }
3475 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
3476
3477 /*
3478 * Check if userspace requested an interrupt window, and that the
3479 * interrupt window is open.
3480 *
3481 * No need to exit to userspace if we already have an interrupt queued.
3482 */
3483 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
3484 {
3485 return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
3486 vcpu->run->request_interrupt_window &&
3487 kvm_arch_interrupt_allowed(vcpu));
3488 }
3489
3490 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
3491 {
3492 struct kvm_run *kvm_run = vcpu->run;
3493
3494 kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
3495 kvm_run->cr8 = kvm_get_cr8(vcpu);
3496 kvm_run->apic_base = kvm_get_apic_base(vcpu);
3497 if (irqchip_in_kernel(vcpu->kvm))
3498 kvm_run->ready_for_interrupt_injection = 1;
3499 else
3500 kvm_run->ready_for_interrupt_injection =
3501 kvm_arch_interrupt_allowed(vcpu) &&
3502 !kvm_cpu_has_interrupt(vcpu) &&
3503 !kvm_event_needs_reinjection(vcpu);
3504 }
3505
3506 static void vapic_enter(struct kvm_vcpu *vcpu)
3507 {
3508 struct kvm_lapic *apic = vcpu->arch.apic;
3509 struct page *page;
3510
3511 if (!apic || !apic->vapic_addr)
3512 return;
3513
3514 page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
3515
3516 vcpu->arch.apic->vapic_page = page;
3517 }
3518
3519 static void vapic_exit(struct kvm_vcpu *vcpu)
3520 {
3521 struct kvm_lapic *apic = vcpu->arch.apic;
3522
3523 if (!apic || !apic->vapic_addr)
3524 return;
3525
3526 down_read(&vcpu->kvm->slots_lock);
3527 kvm_release_page_dirty(apic->vapic_page);
3528 mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
3529 up_read(&vcpu->kvm->slots_lock);
3530 }
3531
3532 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
3533 {
3534 int max_irr, tpr;
3535
3536 if (!kvm_x86_ops->update_cr8_intercept)
3537 return;
3538
3539 if (!vcpu->arch.apic)
3540 return;
3541
3542 if (!vcpu->arch.apic->vapic_addr)
3543 max_irr = kvm_lapic_find_highest_irr(vcpu);
3544 else
3545 max_irr = -1;
3546
3547 if (max_irr != -1)
3548 max_irr >>= 4;
3549
3550 tpr = kvm_lapic_get_cr8(vcpu);
3551
3552 kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
3553 }
3554
3555 static void inject_pending_event(struct kvm_vcpu *vcpu)
3556 {
3557 /* try to reinject previous events if any */
3558 if (vcpu->arch.exception.pending) {
3559 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
3560 vcpu->arch.exception.has_error_code,
3561 vcpu->arch.exception.error_code);
3562 return;
3563 }
3564
3565 if (vcpu->arch.nmi_injected) {
3566 kvm_x86_ops->set_nmi(vcpu);
3567 return;
3568 }
3569
3570 if (vcpu->arch.interrupt.pending) {
3571 kvm_x86_ops->set_irq(vcpu);
3572 return;
3573 }
3574
3575 /* try to inject new event if pending */
3576 if (vcpu->arch.nmi_pending) {
3577 if (kvm_x86_ops->nmi_allowed(vcpu)) {
3578 vcpu->arch.nmi_pending = false;
3579 vcpu->arch.nmi_injected = true;
3580 kvm_x86_ops->set_nmi(vcpu);
3581 }
3582 } else if (kvm_cpu_has_interrupt(vcpu)) {
3583 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
3584 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
3585 false);
3586 kvm_x86_ops->set_irq(vcpu);
3587 }
3588 }
3589 }
3590
3591 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
3592 {
3593 int r;
3594 bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
3595 vcpu->run->request_interrupt_window;
3596
3597 if (vcpu->requests)
3598 if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
3599 kvm_mmu_unload(vcpu);
3600
3601 r = kvm_mmu_reload(vcpu);
3602 if (unlikely(r))
3603 goto out;
3604
3605 if (vcpu->requests) {
3606 if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
3607 __kvm_migrate_timers(vcpu);
3608 if (test_and_clear_bit(KVM_REQ_KVMCLOCK_UPDATE, &vcpu->requests))
3609 kvm_write_guest_time(vcpu);
3610 if (test_and_clear_bit(KVM_REQ_MMU_SYNC, &vcpu->requests))
3611 kvm_mmu_sync_roots(vcpu);
3612 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
3613 kvm_x86_ops->tlb_flush(vcpu);
3614 if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
3615 &vcpu->requests)) {
3616 vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
3617 r = 0;
3618 goto out;
3619 }
3620 if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) {
3621 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
3622 r = 0;
3623 goto out;
3624 }
3625 }
3626
3627 preempt_disable();
3628
3629 kvm_x86_ops->prepare_guest_switch(vcpu);
3630 kvm_load_guest_fpu(vcpu);
3631
3632 local_irq_disable();
3633
3634 clear_bit(KVM_REQ_KICK, &vcpu->requests);
3635 smp_mb__after_clear_bit();
3636
3637 if (vcpu->requests || need_resched() || signal_pending(current)) {
3638 set_bit(KVM_REQ_KICK, &vcpu->requests);
3639 local_irq_enable();
3640 preempt_enable();
3641 r = 1;
3642 goto out;
3643 }
3644
3645 inject_pending_event(vcpu);
3646
3647 /* enable NMI/IRQ window open exits if needed */
3648 if (vcpu->arch.nmi_pending)
3649 kvm_x86_ops->enable_nmi_window(vcpu);
3650 else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
3651 kvm_x86_ops->enable_irq_window(vcpu);
3652
3653 if (kvm_lapic_enabled(vcpu)) {
3654 update_cr8_intercept(vcpu);
3655 kvm_lapic_sync_to_vapic(vcpu);
3656 }
3657
3658 up_read(&vcpu->kvm->slots_lock);
3659
3660 kvm_guest_enter();
3661
3662 if (unlikely(vcpu->arch.switch_db_regs)) {
3663 set_debugreg(0, 7);
3664 set_debugreg(vcpu->arch.eff_db[0], 0);
3665 set_debugreg(vcpu->arch.eff_db[1], 1);
3666 set_debugreg(vcpu->arch.eff_db[2], 2);
3667 set_debugreg(vcpu->arch.eff_db[3], 3);
3668 }
3669
3670 trace_kvm_entry(vcpu->vcpu_id);
3671 kvm_x86_ops->run(vcpu);
3672
3673 if (unlikely(vcpu->arch.switch_db_regs || test_thread_flag(TIF_DEBUG))) {
3674 set_debugreg(current->thread.debugreg0, 0);
3675 set_debugreg(current->thread.debugreg1, 1);
3676 set_debugreg(current->thread.debugreg2, 2);
3677 set_debugreg(current->thread.debugreg3, 3);
3678 set_debugreg(current->thread.debugreg6, 6);
3679 set_debugreg(current->thread.debugreg7, 7);
3680 }
3681
3682 set_bit(KVM_REQ_KICK, &vcpu->requests);
3683 local_irq_enable();
3684
3685 ++vcpu->stat.exits;
3686
3687 /*
3688 * We must have an instruction between local_irq_enable() and
3689 * kvm_guest_exit(), so the timer interrupt isn't delayed by
3690 * the interrupt shadow. The stat.exits increment will do nicely.
3691 * But we need to prevent reordering, hence this barrier():
3692 */
3693 barrier();
3694
3695 kvm_guest_exit();
3696
3697 preempt_enable();
3698
3699 down_read(&vcpu->kvm->slots_lock);
3700
3701 /*
3702 * Profile KVM exit RIPs:
3703 */
3704 if (unlikely(prof_on == KVM_PROFILING)) {
3705 unsigned long rip = kvm_rip_read(vcpu);
3706 profile_hit(KVM_PROFILING, (void *)rip);
3707 }
3708
3709
3710 kvm_lapic_sync_from_vapic(vcpu);
3711
3712 r = kvm_x86_ops->handle_exit(vcpu);
3713 out:
3714 return r;
3715 }
3716
3717
3718 static int __vcpu_run(struct kvm_vcpu *vcpu)
3719 {
3720 int r;
3721
3722 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
3723 pr_debug("vcpu %d received sipi with vector # %x\n",
3724 vcpu->vcpu_id, vcpu->arch.sipi_vector);
3725 kvm_lapic_reset(vcpu);
3726 r = kvm_arch_vcpu_reset(vcpu);
3727 if (r)
3728 return r;
3729 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
3730 }
3731
3732 down_read(&vcpu->kvm->slots_lock);
3733 vapic_enter(vcpu);
3734
3735 r = 1;
3736 while (r > 0) {
3737 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
3738 r = vcpu_enter_guest(vcpu);
3739 else {
3740 up_read(&vcpu->kvm->slots_lock);
3741 kvm_vcpu_block(vcpu);
3742 down_read(&vcpu->kvm->slots_lock);
3743 if (test_and_clear_bit(KVM_REQ_UNHALT, &vcpu->requests))
3744 {
3745 switch(vcpu->arch.mp_state) {
3746 case KVM_MP_STATE_HALTED:
3747 vcpu->arch.mp_state =
3748 KVM_MP_STATE_RUNNABLE;
3749 case KVM_MP_STATE_RUNNABLE:
3750 break;
3751 case KVM_MP_STATE_SIPI_RECEIVED:
3752 default:
3753 r = -EINTR;
3754 break;
3755 }
3756 }
3757 }
3758
3759 if (r <= 0)
3760 break;
3761
3762 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
3763 if (kvm_cpu_has_pending_timer(vcpu))
3764 kvm_inject_pending_timer_irqs(vcpu);
3765
3766 if (dm_request_for_irq_injection(vcpu)) {
3767 r = -EINTR;
3768 vcpu->run->exit_reason = KVM_EXIT_INTR;
3769 ++vcpu->stat.request_irq_exits;
3770 }
3771 if (signal_pending(current)) {
3772 r = -EINTR;
3773 vcpu->run->exit_reason = KVM_EXIT_INTR;
3774 ++vcpu->stat.signal_exits;
3775 }
3776 if (need_resched()) {
3777 up_read(&vcpu->kvm->slots_lock);
3778 kvm_resched(vcpu);
3779 down_read(&vcpu->kvm->slots_lock);
3780 }
3781 }
3782
3783 up_read(&vcpu->kvm->slots_lock);
3784 post_kvm_run_save(vcpu);
3785
3786 vapic_exit(vcpu);
3787
3788 return r;
3789 }
3790
3791 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3792 {
3793 int r;
3794 sigset_t sigsaved;
3795
3796 vcpu_load(vcpu);
3797
3798 if (vcpu->sigset_active)
3799 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
3800
3801 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
3802 kvm_vcpu_block(vcpu);
3803 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
3804 r = -EAGAIN;
3805 goto out;
3806 }
3807
3808 /* re-sync apic's tpr */
3809 if (!irqchip_in_kernel(vcpu->kvm))
3810 kvm_set_cr8(vcpu, kvm_run->cr8);
3811
3812 if (vcpu->arch.pio.cur_count) {
3813 r = complete_pio(vcpu);
3814 if (r)
3815 goto out;
3816 }
3817 if (vcpu->mmio_needed) {
3818 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
3819 vcpu->mmio_read_completed = 1;
3820 vcpu->mmio_needed = 0;
3821
3822 down_read(&vcpu->kvm->slots_lock);
3823 r = emulate_instruction(vcpu, vcpu->arch.mmio_fault_cr2, 0,
3824 EMULTYPE_NO_DECODE);
3825 up_read(&vcpu->kvm->slots_lock);
3826 if (r == EMULATE_DO_MMIO) {
3827 /*
3828 * Read-modify-write. Back to userspace.
3829 */
3830 r = 0;
3831 goto out;
3832 }
3833 }
3834 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL)
3835 kvm_register_write(vcpu, VCPU_REGS_RAX,
3836 kvm_run->hypercall.ret);
3837
3838 r = __vcpu_run(vcpu);
3839
3840 out:
3841 if (vcpu->sigset_active)
3842 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
3843
3844 vcpu_put(vcpu);
3845 return r;
3846 }
3847
3848 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3849 {
3850 vcpu_load(vcpu);
3851
3852 regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
3853 regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
3854 regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
3855 regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
3856 regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
3857 regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
3858 regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
3859 regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
3860 #ifdef CONFIG_X86_64
3861 regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
3862 regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
3863 regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
3864 regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
3865 regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
3866 regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
3867 regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
3868 regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
3869 #endif
3870
3871 regs->rip = kvm_rip_read(vcpu);
3872 regs->rflags = kvm_get_rflags(vcpu);
3873
3874 vcpu_put(vcpu);
3875
3876 return 0;
3877 }
3878
3879 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3880 {
3881 vcpu_load(vcpu);
3882
3883 kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
3884 kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
3885 kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
3886 kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
3887 kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
3888 kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
3889 kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
3890 kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
3891 #ifdef CONFIG_X86_64
3892 kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
3893 kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
3894 kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
3895 kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
3896 kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
3897 kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
3898 kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
3899 kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
3900 #endif
3901
3902 kvm_rip_write(vcpu, regs->rip);
3903 kvm_set_rflags(vcpu, regs->rflags);
3904
3905 vcpu->arch.exception.pending = false;
3906
3907 vcpu_put(vcpu);
3908
3909 return 0;
3910 }
3911
3912 void kvm_get_segment(struct kvm_vcpu *vcpu,
3913 struct kvm_segment *var, int seg)
3914 {
3915 kvm_x86_ops->get_segment(vcpu, var, seg);
3916 }
3917
3918 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
3919 {
3920 struct kvm_segment cs;
3921
3922 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
3923 *db = cs.db;
3924 *l = cs.l;
3925 }
3926 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
3927
3928 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
3929 struct kvm_sregs *sregs)
3930 {
3931 struct descriptor_table dt;
3932
3933 vcpu_load(vcpu);
3934
3935 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3936 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3937 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3938 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3939 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3940 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3941
3942 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3943 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3944
3945 kvm_x86_ops->get_idt(vcpu, &dt);
3946 sregs->idt.limit = dt.limit;
3947 sregs->idt.base = dt.base;
3948 kvm_x86_ops->get_gdt(vcpu, &dt);
3949 sregs->gdt.limit = dt.limit;
3950 sregs->gdt.base = dt.base;
3951
3952 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3953 sregs->cr0 = vcpu->arch.cr0;
3954 sregs->cr2 = vcpu->arch.cr2;
3955 sregs->cr3 = vcpu->arch.cr3;
3956 sregs->cr4 = vcpu->arch.cr4;
3957 sregs->cr8 = kvm_get_cr8(vcpu);
3958 sregs->efer = vcpu->arch.shadow_efer;
3959 sregs->apic_base = kvm_get_apic_base(vcpu);
3960
3961 memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
3962
3963 if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
3964 set_bit(vcpu->arch.interrupt.nr,
3965 (unsigned long *)sregs->interrupt_bitmap);
3966
3967 vcpu_put(vcpu);
3968
3969 return 0;
3970 }
3971
3972 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
3973 struct kvm_mp_state *mp_state)
3974 {
3975 vcpu_load(vcpu);
3976 mp_state->mp_state = vcpu->arch.mp_state;
3977 vcpu_put(vcpu);
3978 return 0;
3979 }
3980
3981 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
3982 struct kvm_mp_state *mp_state)
3983 {
3984 vcpu_load(vcpu);
3985 vcpu->arch.mp_state = mp_state->mp_state;
3986 vcpu_put(vcpu);
3987 return 0;
3988 }
3989
3990 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3991 struct kvm_segment *var, int seg)
3992 {
3993 kvm_x86_ops->set_segment(vcpu, var, seg);
3994 }
3995
3996 static void seg_desct_to_kvm_desct(struct desc_struct *seg_desc, u16 selector,
3997 struct kvm_segment *kvm_desct)
3998 {
3999 kvm_desct->base = get_desc_base(seg_desc);
4000 kvm_desct->limit = get_desc_limit(seg_desc);
4001 if (seg_desc->g) {
4002 kvm_desct->limit <<= 12;
4003 kvm_desct->limit |= 0xfff;
4004 }
4005 kvm_desct->selector = selector;
4006 kvm_desct->type = seg_desc->type;
4007 kvm_desct->present = seg_desc->p;
4008 kvm_desct->dpl = seg_desc->dpl;
4009 kvm_desct->db = seg_desc->d;
4010 kvm_desct->s = seg_desc->s;
4011 kvm_desct->l = seg_desc->l;
4012 kvm_desct->g = seg_desc->g;
4013 kvm_desct->avl = seg_desc->avl;
4014 if (!selector)
4015 kvm_desct->unusable = 1;
4016 else
4017 kvm_desct->unusable = 0;
4018 kvm_desct->padding = 0;
4019 }
4020
4021 static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu,
4022 u16 selector,
4023 struct descriptor_table *dtable)
4024 {
4025 if (selector & 1 << 2) {
4026 struct kvm_segment kvm_seg;
4027
4028 kvm_get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR);
4029
4030 if (kvm_seg.unusable)
4031 dtable->limit = 0;
4032 else
4033 dtable->limit = kvm_seg.limit;
4034 dtable->base = kvm_seg.base;
4035 }
4036 else
4037 kvm_x86_ops->get_gdt(vcpu, dtable);
4038 }
4039
4040 /* allowed just for 8 bytes segments */
4041 static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
4042 struct desc_struct *seg_desc)
4043 {
4044 struct descriptor_table dtable;
4045 u16 index = selector >> 3;
4046
4047 get_segment_descriptor_dtable(vcpu, selector, &dtable);
4048
4049 if (dtable.limit < index * 8 + 7) {
4050 kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
4051 return 1;
4052 }
4053 return kvm_read_guest_virt(dtable.base + index*8, seg_desc, sizeof(*seg_desc), vcpu);
4054 }
4055
4056 /* allowed just for 8 bytes segments */
4057 static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
4058 struct desc_struct *seg_desc)
4059 {
4060 struct descriptor_table dtable;
4061 u16 index = selector >> 3;
4062
4063 get_segment_descriptor_dtable(vcpu, selector, &dtable);
4064
4065 if (dtable.limit < index * 8 + 7)
4066 return 1;
4067 return kvm_write_guest_virt(dtable.base + index*8, seg_desc, sizeof(*seg_desc), vcpu);
4068 }
4069
4070 static gpa_t get_tss_base_addr(struct kvm_vcpu *vcpu,
4071 struct desc_struct *seg_desc)
4072 {
4073 u32 base_addr = get_desc_base(seg_desc);
4074
4075 return vcpu->arch.mmu.gva_to_gpa(vcpu, base_addr);
4076 }
4077
4078 static u16 get_segment_selector(struct kvm_vcpu *vcpu, int seg)
4079 {
4080 struct kvm_segment kvm_seg;
4081
4082 kvm_get_segment(vcpu, &kvm_seg, seg);
4083 return kvm_seg.selector;
4084 }
4085
4086 static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu,
4087 u16 selector,
4088 struct kvm_segment *kvm_seg)
4089 {
4090 struct desc_struct seg_desc;
4091
4092 if (load_guest_segment_descriptor(vcpu, selector, &seg_desc))
4093 return 1;
4094 seg_desct_to_kvm_desct(&seg_desc, selector, kvm_seg);
4095 return 0;
4096 }
4097
4098 static int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg)
4099 {
4100 struct kvm_segment segvar = {
4101 .base = selector << 4,
4102 .limit = 0xffff,
4103 .selector = selector,
4104 .type = 3,
4105 .present = 1,
4106 .dpl = 3,
4107 .db = 0,
4108 .s = 1,
4109 .l = 0,
4110 .g = 0,
4111 .avl = 0,
4112 .unusable = 0,
4113 };
4114 kvm_x86_ops->set_segment(vcpu, &segvar, seg);
4115 return 0;
4116 }
4117
4118 static int is_vm86_segment(struct kvm_vcpu *vcpu, int seg)
4119 {
4120 return (seg != VCPU_SREG_LDTR) &&
4121 (seg != VCPU_SREG_TR) &&
4122 (kvm_get_rflags(vcpu) & X86_EFLAGS_VM);
4123 }
4124
4125 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
4126 int type_bits, int seg)
4127 {
4128 struct kvm_segment kvm_seg;
4129
4130 if (is_vm86_segment(vcpu, seg) || !(vcpu->arch.cr0 & X86_CR0_PE))
4131 return kvm_load_realmode_segment(vcpu, selector, seg);
4132 if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg))
4133 return 1;
4134 kvm_seg.type |= type_bits;
4135
4136 if (seg != VCPU_SREG_SS && seg != VCPU_SREG_CS &&
4137 seg != VCPU_SREG_LDTR)
4138 if (!kvm_seg.s)
4139 kvm_seg.unusable = 1;
4140
4141 kvm_set_segment(vcpu, &kvm_seg, seg);
4142 return 0;
4143 }
4144
4145 static void save_state_to_tss32(struct kvm_vcpu *vcpu,
4146 struct tss_segment_32 *tss)
4147 {
4148 tss->cr3 = vcpu->arch.cr3;
4149 tss->eip = kvm_rip_read(vcpu);
4150 tss->eflags = kvm_get_rflags(vcpu);
4151 tss->eax = kvm_register_read(vcpu, VCPU_REGS_RAX);
4152 tss->ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
4153 tss->edx = kvm_register_read(vcpu, VCPU_REGS_RDX);
4154 tss->ebx = kvm_register_read(vcpu, VCPU_REGS_RBX);
4155 tss->esp = kvm_register_read(vcpu, VCPU_REGS_RSP);
4156 tss->ebp = kvm_register_read(vcpu, VCPU_REGS_RBP);
4157 tss->esi = kvm_register_read(vcpu, VCPU_REGS_RSI);
4158 tss->edi = kvm_register_read(vcpu, VCPU_REGS_RDI);
4159 tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
4160 tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
4161 tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
4162 tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
4163 tss->fs = get_segment_selector(vcpu, VCPU_SREG_FS);
4164 tss->gs = get_segment_selector(vcpu, VCPU_SREG_GS);
4165 tss->ldt_selector = get_segment_selector(vcpu, VCPU_SREG_LDTR);
4166 }
4167
4168 static int load_state_from_tss32(struct kvm_vcpu *vcpu,
4169 struct tss_segment_32 *tss)
4170 {
4171 kvm_set_cr3(vcpu, tss->cr3);
4172
4173 kvm_rip_write(vcpu, tss->eip);
4174 kvm_set_rflags(vcpu, tss->eflags | 2);
4175
4176 kvm_register_write(vcpu, VCPU_REGS_RAX, tss->eax);
4177 kvm_register_write(vcpu, VCPU_REGS_RCX, tss->ecx);
4178 kvm_register_write(vcpu, VCPU_REGS_RDX, tss->edx);
4179 kvm_register_write(vcpu, VCPU_REGS_RBX, tss->ebx);
4180 kvm_register_write(vcpu, VCPU_REGS_RSP, tss->esp);
4181 kvm_register_write(vcpu, VCPU_REGS_RBP, tss->ebp);
4182 kvm_register_write(vcpu, VCPU_REGS_RSI, tss->esi);
4183 kvm_register_write(vcpu, VCPU_REGS_RDI, tss->edi);
4184
4185 if (kvm_load_segment_descriptor(vcpu, tss->ldt_selector, 0, VCPU_SREG_LDTR))
4186 return 1;
4187
4188 if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
4189 return 1;
4190
4191 if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
4192 return 1;
4193
4194 if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
4195 return 1;
4196
4197 if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
4198 return 1;
4199
4200 if (kvm_load_segment_descriptor(vcpu, tss->fs, 1, VCPU_SREG_FS))
4201 return 1;
4202
4203 if (kvm_load_segment_descriptor(vcpu, tss->gs, 1, VCPU_SREG_GS))
4204 return 1;
4205 return 0;
4206 }
4207
4208 static void save_state_to_tss16(struct kvm_vcpu *vcpu,
4209 struct tss_segment_16 *tss)
4210 {
4211 tss->ip = kvm_rip_read(vcpu);
4212 tss->flag = kvm_get_rflags(vcpu);
4213 tss->ax = kvm_register_read(vcpu, VCPU_REGS_RAX);
4214 tss->cx = kvm_register_read(vcpu, VCPU_REGS_RCX);
4215 tss->dx = kvm_register_read(vcpu, VCPU_REGS_RDX);
4216 tss->bx = kvm_register_read(vcpu, VCPU_REGS_RBX);
4217 tss->sp = kvm_register_read(vcpu, VCPU_REGS_RSP);
4218 tss->bp = kvm_register_read(vcpu, VCPU_REGS_RBP);
4219 tss->si = kvm_register_read(vcpu, VCPU_REGS_RSI);
4220 tss->di = kvm_register_read(vcpu, VCPU_REGS_RDI);
4221
4222 tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
4223 tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
4224 tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
4225 tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
4226 tss->ldt = get_segment_selector(vcpu, VCPU_SREG_LDTR);
4227 }
4228
4229 static int load_state_from_tss16(struct kvm_vcpu *vcpu,
4230 struct tss_segment_16 *tss)
4231 {
4232 kvm_rip_write(vcpu, tss->ip);
4233 kvm_set_rflags(vcpu, tss->flag | 2);
4234 kvm_register_write(vcpu, VCPU_REGS_RAX, tss->ax);
4235 kvm_register_write(vcpu, VCPU_REGS_RCX, tss->cx);
4236 kvm_register_write(vcpu, VCPU_REGS_RDX, tss->dx);
4237 kvm_register_write(vcpu, VCPU_REGS_RBX, tss->bx);
4238 kvm_register_write(vcpu, VCPU_REGS_RSP, tss->sp);
4239 kvm_register_write(vcpu, VCPU_REGS_RBP, tss->bp);
4240 kvm_register_write(vcpu, VCPU_REGS_RSI, tss->si);
4241 kvm_register_write(vcpu, VCPU_REGS_RDI, tss->di);
4242
4243 if (kvm_load_segment_descriptor(vcpu, tss->ldt, 0, VCPU_SREG_LDTR))
4244 return 1;
4245
4246 if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
4247 return 1;
4248
4249 if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
4250 return 1;
4251
4252 if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
4253 return 1;
4254
4255 if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
4256 return 1;
4257 return 0;
4258 }
4259
4260 static int kvm_task_switch_16(struct kvm_vcpu *vcpu, u16 tss_selector,
4261 u16 old_tss_sel, u32 old_tss_base,
4262 struct desc_struct *nseg_desc)
4263 {
4264 struct tss_segment_16 tss_segment_16;
4265 int ret = 0;
4266
4267 if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
4268 sizeof tss_segment_16))
4269 goto out;
4270
4271 save_state_to_tss16(vcpu, &tss_segment_16);
4272
4273 if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
4274 sizeof tss_segment_16))
4275 goto out;
4276
4277 if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
4278 &tss_segment_16, sizeof tss_segment_16))
4279 goto out;
4280
4281 if (old_tss_sel != 0xffff) {
4282 tss_segment_16.prev_task_link = old_tss_sel;
4283
4284 if (kvm_write_guest(vcpu->kvm,
4285 get_tss_base_addr(vcpu, nseg_desc),
4286 &tss_segment_16.prev_task_link,
4287 sizeof tss_segment_16.prev_task_link))
4288 goto out;
4289 }
4290
4291 if (load_state_from_tss16(vcpu, &tss_segment_16))
4292 goto out;
4293
4294 ret = 1;
4295 out:
4296 return ret;
4297 }
4298
4299 static int kvm_task_switch_32(struct kvm_vcpu *vcpu, u16 tss_selector,
4300 u16 old_tss_sel, u32 old_tss_base,
4301 struct desc_struct *nseg_desc)
4302 {
4303 struct tss_segment_32 tss_segment_32;
4304 int ret = 0;
4305
4306 if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
4307 sizeof tss_segment_32))
4308 goto out;
4309
4310 save_state_to_tss32(vcpu, &tss_segment_32);
4311
4312 if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
4313 sizeof tss_segment_32))
4314 goto out;
4315
4316 if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
4317 &tss_segment_32, sizeof tss_segment_32))
4318 goto out;
4319
4320 if (old_tss_sel != 0xffff) {
4321 tss_segment_32.prev_task_link = old_tss_sel;
4322
4323 if (kvm_write_guest(vcpu->kvm,
4324 get_tss_base_addr(vcpu, nseg_desc),
4325 &tss_segment_32.prev_task_link,
4326 sizeof tss_segment_32.prev_task_link))
4327 goto out;
4328 }
4329
4330 if (load_state_from_tss32(vcpu, &tss_segment_32))
4331 goto out;
4332
4333 ret = 1;
4334 out:
4335 return ret;
4336 }
4337
4338 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
4339 {
4340 struct kvm_segment tr_seg;
4341 struct desc_struct cseg_desc;
4342 struct desc_struct nseg_desc;
4343 int ret = 0;
4344 u32 old_tss_base = get_segment_base(vcpu, VCPU_SREG_TR);
4345 u16 old_tss_sel = get_segment_selector(vcpu, VCPU_SREG_TR);
4346
4347 old_tss_base = vcpu->arch.mmu.gva_to_gpa(vcpu, old_tss_base);
4348
4349 /* FIXME: Handle errors. Failure to read either TSS or their
4350 * descriptors should generate a pagefault.
4351 */
4352 if (load_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc))
4353 goto out;
4354
4355 if (load_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc))
4356 goto out;
4357
4358 if (reason != TASK_SWITCH_IRET) {
4359 int cpl;
4360
4361 cpl = kvm_x86_ops->get_cpl(vcpu);
4362 if ((tss_selector & 3) > nseg_desc.dpl || cpl > nseg_desc.dpl) {
4363 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
4364 return 1;
4365 }
4366 }
4367
4368 if (!nseg_desc.p || get_desc_limit(&nseg_desc) < 0x67) {
4369 kvm_queue_exception_e(vcpu, TS_VECTOR, tss_selector & 0xfffc);
4370 return 1;
4371 }
4372
4373 if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
4374 cseg_desc.type &= ~(1 << 1); //clear the B flag
4375 save_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc);
4376 }
4377
4378 if (reason == TASK_SWITCH_IRET) {
4379 u32 eflags = kvm_get_rflags(vcpu);
4380 kvm_set_rflags(vcpu, eflags & ~X86_EFLAGS_NT);
4381 }
4382
4383 /* set back link to prev task only if NT bit is set in eflags
4384 note that old_tss_sel is not used afetr this point */
4385 if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
4386 old_tss_sel = 0xffff;
4387
4388 /* set back link to prev task only if NT bit is set in eflags
4389 note that old_tss_sel is not used afetr this point */
4390 if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
4391 old_tss_sel = 0xffff;
4392
4393 if (nseg_desc.type & 8)
4394 ret = kvm_task_switch_32(vcpu, tss_selector, old_tss_sel,
4395 old_tss_base, &nseg_desc);
4396 else
4397 ret = kvm_task_switch_16(vcpu, tss_selector, old_tss_sel,
4398 old_tss_base, &nseg_desc);
4399
4400 if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) {
4401 u32 eflags = kvm_get_rflags(vcpu);
4402 kvm_set_rflags(vcpu, eflags | X86_EFLAGS_NT);
4403 }
4404
4405 if (reason != TASK_SWITCH_IRET) {
4406 nseg_desc.type |= (1 << 1);
4407 save_guest_segment_descriptor(vcpu, tss_selector,
4408 &nseg_desc);
4409 }
4410
4411 kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 | X86_CR0_TS);
4412 seg_desct_to_kvm_desct(&nseg_desc, tss_selector, &tr_seg);
4413 tr_seg.type = 11;
4414 kvm_set_segment(vcpu, &tr_seg, VCPU_SREG_TR);
4415 out:
4416 return ret;
4417 }
4418 EXPORT_SYMBOL_GPL(kvm_task_switch);
4419
4420 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
4421 struct kvm_sregs *sregs)
4422 {
4423 int mmu_reset_needed = 0;
4424 int pending_vec, max_bits;
4425 struct descriptor_table dt;
4426
4427 vcpu_load(vcpu);
4428
4429 dt.limit = sregs->idt.limit;
4430 dt.base = sregs->idt.base;
4431 kvm_x86_ops->set_idt(vcpu, &dt);
4432 dt.limit = sregs->gdt.limit;
4433 dt.base = sregs->gdt.base;
4434 kvm_x86_ops->set_gdt(vcpu, &dt);
4435
4436 vcpu->arch.cr2 = sregs->cr2;
4437 mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
4438 vcpu->arch.cr3 = sregs->cr3;
4439
4440 kvm_set_cr8(vcpu, sregs->cr8);
4441
4442 mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
4443 kvm_x86_ops->set_efer(vcpu, sregs->efer);
4444 kvm_set_apic_base(vcpu, sregs->apic_base);
4445
4446 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
4447
4448 mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
4449 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
4450 vcpu->arch.cr0 = sregs->cr0;
4451
4452 mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
4453 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
4454 if (!is_long_mode(vcpu) && is_pae(vcpu))
4455 load_pdptrs(vcpu, vcpu->arch.cr3);
4456
4457 if (mmu_reset_needed)
4458 kvm_mmu_reset_context(vcpu);
4459
4460 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
4461 pending_vec = find_first_bit(
4462 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
4463 if (pending_vec < max_bits) {
4464 kvm_queue_interrupt(vcpu, pending_vec, false);
4465 pr_debug("Set back pending irq %d\n", pending_vec);
4466 if (irqchip_in_kernel(vcpu->kvm))
4467 kvm_pic_clear_isr_ack(vcpu->kvm);
4468 }
4469
4470 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
4471 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
4472 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
4473 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
4474 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
4475 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
4476
4477 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
4478 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
4479
4480 update_cr8_intercept(vcpu);
4481
4482 /* Older userspace won't unhalt the vcpu on reset. */
4483 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
4484 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
4485 !(vcpu->arch.cr0 & X86_CR0_PE))
4486 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4487
4488 vcpu_put(vcpu);
4489
4490 return 0;
4491 }
4492
4493 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
4494 struct kvm_guest_debug *dbg)
4495 {
4496 unsigned long rflags;
4497 int i;
4498
4499 vcpu_load(vcpu);
4500
4501 /*
4502 * Read rflags as long as potentially injected trace flags are still
4503 * filtered out.
4504 */
4505 rflags = kvm_get_rflags(vcpu);
4506
4507 vcpu->guest_debug = dbg->control;
4508 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
4509 vcpu->guest_debug = 0;
4510
4511 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
4512 for (i = 0; i < KVM_NR_DB_REGS; ++i)
4513 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
4514 vcpu->arch.switch_db_regs =
4515 (dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
4516 } else {
4517 for (i = 0; i < KVM_NR_DB_REGS; i++)
4518 vcpu->arch.eff_db[i] = vcpu->arch.db[i];
4519 vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
4520 }
4521
4522 /*
4523 * Trigger an rflags update that will inject or remove the trace
4524 * flags.
4525 */
4526 kvm_set_rflags(vcpu, rflags);
4527
4528 kvm_x86_ops->set_guest_debug(vcpu, dbg);
4529
4530 if (vcpu->guest_debug & KVM_GUESTDBG_INJECT_DB)
4531 kvm_queue_exception(vcpu, DB_VECTOR);
4532 else if (vcpu->guest_debug & KVM_GUESTDBG_INJECT_BP)
4533 kvm_queue_exception(vcpu, BP_VECTOR);
4534
4535 vcpu_put(vcpu);
4536
4537 return 0;
4538 }
4539
4540 /*
4541 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
4542 * we have asm/x86/processor.h
4543 */
4544 struct fxsave {
4545 u16 cwd;
4546 u16 swd;
4547 u16 twd;
4548 u16 fop;
4549 u64 rip;
4550 u64 rdp;
4551 u32 mxcsr;
4552 u32 mxcsr_mask;
4553 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
4554 #ifdef CONFIG_X86_64
4555 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
4556 #else
4557 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
4558 #endif
4559 };
4560
4561 /*
4562 * Translate a guest virtual address to a guest physical address.
4563 */
4564 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
4565 struct kvm_translation *tr)
4566 {
4567 unsigned long vaddr = tr->linear_address;
4568 gpa_t gpa;
4569
4570 vcpu_load(vcpu);
4571 down_read(&vcpu->kvm->slots_lock);
4572 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
4573 up_read(&vcpu->kvm->slots_lock);
4574 tr->physical_address = gpa;
4575 tr->valid = gpa != UNMAPPED_GVA;
4576 tr->writeable = 1;
4577 tr->usermode = 0;
4578 vcpu_put(vcpu);
4579
4580 return 0;
4581 }
4582
4583 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4584 {
4585 struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
4586
4587 vcpu_load(vcpu);
4588
4589 memcpy(fpu->fpr, fxsave->st_space, 128);
4590 fpu->fcw = fxsave->cwd;
4591 fpu->fsw = fxsave->swd;
4592 fpu->ftwx = fxsave->twd;
4593 fpu->last_opcode = fxsave->fop;
4594 fpu->last_ip = fxsave->rip;
4595 fpu->last_dp = fxsave->rdp;
4596 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
4597
4598 vcpu_put(vcpu);
4599
4600 return 0;
4601 }
4602
4603 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4604 {
4605 struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
4606
4607 vcpu_load(vcpu);
4608
4609 memcpy(fxsave->st_space, fpu->fpr, 128);
4610 fxsave->cwd = fpu->fcw;
4611 fxsave->swd = fpu->fsw;
4612 fxsave->twd = fpu->ftwx;
4613 fxsave->fop = fpu->last_opcode;
4614 fxsave->rip = fpu->last_ip;
4615 fxsave->rdp = fpu->last_dp;
4616 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
4617
4618 vcpu_put(vcpu);
4619
4620 return 0;
4621 }
4622
4623 void fx_init(struct kvm_vcpu *vcpu)
4624 {
4625 unsigned after_mxcsr_mask;
4626
4627 /*
4628 * Touch the fpu the first time in non atomic context as if
4629 * this is the first fpu instruction the exception handler
4630 * will fire before the instruction returns and it'll have to
4631 * allocate ram with GFP_KERNEL.
4632 */
4633 if (!used_math())
4634 kvm_fx_save(&vcpu->arch.host_fx_image);
4635
4636 /* Initialize guest FPU by resetting ours and saving into guest's */
4637 preempt_disable();
4638 kvm_fx_save(&vcpu->arch.host_fx_image);
4639 kvm_fx_finit();
4640 kvm_fx_save(&vcpu->arch.guest_fx_image);
4641 kvm_fx_restore(&vcpu->arch.host_fx_image);
4642 preempt_enable();
4643
4644 vcpu->arch.cr0 |= X86_CR0_ET;
4645 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
4646 vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
4647 memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
4648 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
4649 }
4650 EXPORT_SYMBOL_GPL(fx_init);
4651
4652 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
4653 {
4654 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
4655 return;
4656
4657 vcpu->guest_fpu_loaded = 1;
4658 kvm_fx_save(&vcpu->arch.host_fx_image);
4659 kvm_fx_restore(&vcpu->arch.guest_fx_image);
4660 }
4661 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
4662
4663 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
4664 {
4665 if (!vcpu->guest_fpu_loaded)
4666 return;
4667
4668 vcpu->guest_fpu_loaded = 0;
4669 kvm_fx_save(&vcpu->arch.guest_fx_image);
4670 kvm_fx_restore(&vcpu->arch.host_fx_image);
4671 ++vcpu->stat.fpu_reload;
4672 }
4673 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
4674
4675 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
4676 {
4677 if (vcpu->arch.time_page) {
4678 kvm_release_page_dirty(vcpu->arch.time_page);
4679 vcpu->arch.time_page = NULL;
4680 }
4681
4682 kvm_x86_ops->vcpu_free(vcpu);
4683 }
4684
4685 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
4686 unsigned int id)
4687 {
4688 return kvm_x86_ops->vcpu_create(kvm, id);
4689 }
4690
4691 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
4692 {
4693 int r;
4694
4695 /* We do fxsave: this must be aligned. */
4696 BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
4697
4698 vcpu->arch.mtrr_state.have_fixed = 1;
4699 vcpu_load(vcpu);
4700 r = kvm_arch_vcpu_reset(vcpu);
4701 if (r == 0)
4702 r = kvm_mmu_setup(vcpu);
4703 vcpu_put(vcpu);
4704 if (r < 0)
4705 goto free_vcpu;
4706
4707 return 0;
4708 free_vcpu:
4709 kvm_x86_ops->vcpu_free(vcpu);
4710 return r;
4711 }
4712
4713 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
4714 {
4715 vcpu_load(vcpu);
4716 kvm_mmu_unload(vcpu);
4717 vcpu_put(vcpu);
4718
4719 kvm_x86_ops->vcpu_free(vcpu);
4720 }
4721
4722 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
4723 {
4724 vcpu->arch.nmi_pending = false;
4725 vcpu->arch.nmi_injected = false;
4726
4727 vcpu->arch.switch_db_regs = 0;
4728 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
4729 vcpu->arch.dr6 = DR6_FIXED_1;
4730 vcpu->arch.dr7 = DR7_FIXED_1;
4731
4732 return kvm_x86_ops->vcpu_reset(vcpu);
4733 }
4734
4735 int kvm_arch_hardware_enable(void *garbage)
4736 {
4737 /*
4738 * Since this may be called from a hotplug notifcation,
4739 * we can't get the CPU frequency directly.
4740 */
4741 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
4742 int cpu = raw_smp_processor_id();
4743 per_cpu(cpu_tsc_khz, cpu) = 0;
4744 }
4745 return kvm_x86_ops->hardware_enable(garbage);
4746 }
4747
4748 void kvm_arch_hardware_disable(void *garbage)
4749 {
4750 kvm_x86_ops->hardware_disable(garbage);
4751 }
4752
4753 int kvm_arch_hardware_setup(void)
4754 {
4755 return kvm_x86_ops->hardware_setup();
4756 }
4757
4758 void kvm_arch_hardware_unsetup(void)
4759 {
4760 kvm_x86_ops->hardware_unsetup();
4761 }
4762
4763 void kvm_arch_check_processor_compat(void *rtn)
4764 {
4765 kvm_x86_ops->check_processor_compatibility(rtn);
4766 }
4767
4768 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
4769 {
4770 struct page *page;
4771 struct kvm *kvm;
4772 int r;
4773
4774 BUG_ON(vcpu->kvm == NULL);
4775 kvm = vcpu->kvm;
4776
4777 vcpu->arch.mmu.root_hpa = INVALID_PAGE;
4778 if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
4779 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4780 else
4781 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
4782
4783 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
4784 if (!page) {
4785 r = -ENOMEM;
4786 goto fail;
4787 }
4788 vcpu->arch.pio_data = page_address(page);
4789
4790 r = kvm_mmu_create(vcpu);
4791 if (r < 0)
4792 goto fail_free_pio_data;
4793
4794 if (irqchip_in_kernel(kvm)) {
4795 r = kvm_create_lapic(vcpu);
4796 if (r < 0)
4797 goto fail_mmu_destroy;
4798 }
4799
4800 vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
4801 GFP_KERNEL);
4802 if (!vcpu->arch.mce_banks) {
4803 r = -ENOMEM;
4804 goto fail_mmu_destroy;
4805 }
4806 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
4807
4808 return 0;
4809
4810 fail_mmu_destroy:
4811 kvm_mmu_destroy(vcpu);
4812 fail_free_pio_data:
4813 free_page((unsigned long)vcpu->arch.pio_data);
4814 fail:
4815 return r;
4816 }
4817
4818 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
4819 {
4820 kvm_free_lapic(vcpu);
4821 down_read(&vcpu->kvm->slots_lock);
4822 kvm_mmu_destroy(vcpu);
4823 up_read(&vcpu->kvm->slots_lock);
4824 free_page((unsigned long)vcpu->arch.pio_data);
4825 }
4826
4827 struct kvm *kvm_arch_create_vm(void)
4828 {
4829 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
4830
4831 if (!kvm)
4832 return ERR_PTR(-ENOMEM);
4833
4834 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
4835 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
4836
4837 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
4838 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
4839
4840 rdtscll(kvm->arch.vm_init_tsc);
4841
4842 return kvm;
4843 }
4844
4845 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
4846 {
4847 vcpu_load(vcpu);
4848 kvm_mmu_unload(vcpu);
4849 vcpu_put(vcpu);
4850 }
4851
4852 static void kvm_free_vcpus(struct kvm *kvm)
4853 {
4854 unsigned int i;
4855 struct kvm_vcpu *vcpu;
4856
4857 /*
4858 * Unpin any mmu pages first.
4859 */
4860 kvm_for_each_vcpu(i, vcpu, kvm)
4861 kvm_unload_vcpu_mmu(vcpu);
4862 kvm_for_each_vcpu(i, vcpu, kvm)
4863 kvm_arch_vcpu_free(vcpu);
4864
4865 mutex_lock(&kvm->lock);
4866 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
4867 kvm->vcpus[i] = NULL;
4868
4869 atomic_set(&kvm->online_vcpus, 0);
4870 mutex_unlock(&kvm->lock);
4871 }
4872
4873 void kvm_arch_sync_events(struct kvm *kvm)
4874 {
4875 kvm_free_all_assigned_devices(kvm);
4876 }
4877
4878 void kvm_arch_destroy_vm(struct kvm *kvm)
4879 {
4880 kvm_iommu_unmap_guest(kvm);
4881 kvm_free_pit(kvm);
4882 kfree(kvm->arch.vpic);
4883 kfree(kvm->arch.vioapic);
4884 kvm_free_vcpus(kvm);
4885 kvm_free_physmem(kvm);
4886 if (kvm->arch.apic_access_page)
4887 put_page(kvm->arch.apic_access_page);
4888 if (kvm->arch.ept_identity_pagetable)
4889 put_page(kvm->arch.ept_identity_pagetable);
4890 kfree(kvm);
4891 }
4892
4893 int kvm_arch_set_memory_region(struct kvm *kvm,
4894 struct kvm_userspace_memory_region *mem,
4895 struct kvm_memory_slot old,
4896 int user_alloc)
4897 {
4898 int npages = mem->memory_size >> PAGE_SHIFT;
4899 struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
4900
4901 /*To keep backward compatibility with older userspace,
4902 *x86 needs to hanlde !user_alloc case.
4903 */
4904 if (!user_alloc) {
4905 if (npages && !old.rmap) {
4906 unsigned long userspace_addr;
4907
4908 down_write(&current->mm->mmap_sem);
4909 userspace_addr = do_mmap(NULL, 0,
4910 npages * PAGE_SIZE,
4911 PROT_READ | PROT_WRITE,
4912 MAP_PRIVATE | MAP_ANONYMOUS,
4913 0);
4914 up_write(&current->mm->mmap_sem);
4915
4916 if (IS_ERR((void *)userspace_addr))
4917 return PTR_ERR((void *)userspace_addr);
4918
4919 /* set userspace_addr atomically for kvm_hva_to_rmapp */
4920 spin_lock(&kvm->mmu_lock);
4921 memslot->userspace_addr = userspace_addr;
4922 spin_unlock(&kvm->mmu_lock);
4923 } else {
4924 if (!old.user_alloc && old.rmap) {
4925 int ret;
4926
4927 down_write(&current->mm->mmap_sem);
4928 ret = do_munmap(current->mm, old.userspace_addr,
4929 old.npages * PAGE_SIZE);
4930 up_write(&current->mm->mmap_sem);
4931 if (ret < 0)
4932 printk(KERN_WARNING
4933 "kvm_vm_ioctl_set_memory_region: "
4934 "failed to munmap memory\n");
4935 }
4936 }
4937 }
4938
4939 spin_lock(&kvm->mmu_lock);
4940 if (!kvm->arch.n_requested_mmu_pages) {
4941 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
4942 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
4943 }
4944
4945 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
4946 spin_unlock(&kvm->mmu_lock);
4947
4948 return 0;
4949 }
4950
4951 void kvm_arch_flush_shadow(struct kvm *kvm)
4952 {
4953 kvm_mmu_zap_all(kvm);
4954 kvm_reload_remote_mmus(kvm);
4955 }
4956
4957 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
4958 {
4959 return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
4960 || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
4961 || vcpu->arch.nmi_pending ||
4962 (kvm_arch_interrupt_allowed(vcpu) &&
4963 kvm_cpu_has_interrupt(vcpu));
4964 }
4965
4966 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
4967 {
4968 int me;
4969 int cpu = vcpu->cpu;
4970
4971 if (waitqueue_active(&vcpu->wq)) {
4972 wake_up_interruptible(&vcpu->wq);
4973 ++vcpu->stat.halt_wakeup;
4974 }
4975
4976 me = get_cpu();
4977 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
4978 if (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests))
4979 smp_send_reschedule(cpu);
4980 put_cpu();
4981 }
4982
4983 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
4984 {
4985 return kvm_x86_ops->interrupt_allowed(vcpu);
4986 }
4987
4988 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
4989 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
4990 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
4991 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
4992 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
4993 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
4994 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
4995 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
4996 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
4997 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
4998 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
kernel-based virtual machine