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c7b01efe06469627b32d0e850a76347a5fbb9e40
[deliverable/linux.git] / arch / x86 / kvm / x86.c
1 /*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * derived from drivers/kvm/kvm_main.c
5 *
6 * Copyright (C) 2006 Qumranet, Inc.
7 *
8 * Authors:
9 * Avi Kivity <avi@qumranet.com>
10 * Yaniv Kamay <yaniv@qumranet.com>
11 *
12 * This work is licensed under the terms of the GNU GPL, version 2. See
13 * the COPYING file in the top-level directory.
14 *
15 */
16
17 #include <linux/kvm_host.h>
18 #include "irq.h"
19 #include "mmu.h"
20 #include "i8254.h"
21 #include "tss.h"
22
23 #include <linux/clocksource.h>
24 #include <linux/kvm.h>
25 #include <linux/fs.h>
26 #include <linux/vmalloc.h>
27 #include <linux/module.h>
28 #include <linux/mman.h>
29 #include <linux/highmem.h>
30
31 #include <asm/uaccess.h>
32 #include <asm/msr.h>
33 #include <asm/desc.h>
34
35 #define MAX_IO_MSRS 256
36 #define CR0_RESERVED_BITS \
37 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
38 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
39 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
40 #define CR4_RESERVED_BITS \
41 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
42 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
43 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
44 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
45
46 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
47 /* EFER defaults:
48 * - enable syscall per default because its emulated by KVM
49 * - enable LME and LMA per default on 64 bit KVM
50 */
51 #ifdef CONFIG_X86_64
52 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
53 #else
54 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
55 #endif
56
57 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
58 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
59
60 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
61 struct kvm_cpuid_entry2 __user *entries);
62
63 struct kvm_x86_ops *kvm_x86_ops;
64
65 struct kvm_stats_debugfs_item debugfs_entries[] = {
66 { "pf_fixed", VCPU_STAT(pf_fixed) },
67 { "pf_guest", VCPU_STAT(pf_guest) },
68 { "tlb_flush", VCPU_STAT(tlb_flush) },
69 { "invlpg", VCPU_STAT(invlpg) },
70 { "exits", VCPU_STAT(exits) },
71 { "io_exits", VCPU_STAT(io_exits) },
72 { "mmio_exits", VCPU_STAT(mmio_exits) },
73 { "signal_exits", VCPU_STAT(signal_exits) },
74 { "irq_window", VCPU_STAT(irq_window_exits) },
75 { "nmi_window", VCPU_STAT(nmi_window_exits) },
76 { "halt_exits", VCPU_STAT(halt_exits) },
77 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
78 { "hypercalls", VCPU_STAT(hypercalls) },
79 { "request_irq", VCPU_STAT(request_irq_exits) },
80 { "irq_exits", VCPU_STAT(irq_exits) },
81 { "host_state_reload", VCPU_STAT(host_state_reload) },
82 { "efer_reload", VCPU_STAT(efer_reload) },
83 { "fpu_reload", VCPU_STAT(fpu_reload) },
84 { "insn_emulation", VCPU_STAT(insn_emulation) },
85 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
86 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
87 { "mmu_pte_write", VM_STAT(mmu_pte_write) },
88 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
89 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
90 { "mmu_flooded", VM_STAT(mmu_flooded) },
91 { "mmu_recycled", VM_STAT(mmu_recycled) },
92 { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
93 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
94 { "largepages", VM_STAT(lpages) },
95 { NULL }
96 };
97
98
99 unsigned long segment_base(u16 selector)
100 {
101 struct descriptor_table gdt;
102 struct desc_struct *d;
103 unsigned long table_base;
104 unsigned long v;
105
106 if (selector == 0)
107 return 0;
108
109 asm("sgdt %0" : "=m"(gdt));
110 table_base = gdt.base;
111
112 if (selector & 4) { /* from ldt */
113 u16 ldt_selector;
114
115 asm("sldt %0" : "=g"(ldt_selector));
116 table_base = segment_base(ldt_selector);
117 }
118 d = (struct desc_struct *)(table_base + (selector & ~7));
119 v = d->base0 | ((unsigned long)d->base1 << 16) |
120 ((unsigned long)d->base2 << 24);
121 #ifdef CONFIG_X86_64
122 if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
123 v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
124 #endif
125 return v;
126 }
127 EXPORT_SYMBOL_GPL(segment_base);
128
129 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
130 {
131 if (irqchip_in_kernel(vcpu->kvm))
132 return vcpu->arch.apic_base;
133 else
134 return vcpu->arch.apic_base;
135 }
136 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
137
138 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
139 {
140 /* TODO: reserve bits check */
141 if (irqchip_in_kernel(vcpu->kvm))
142 kvm_lapic_set_base(vcpu, data);
143 else
144 vcpu->arch.apic_base = data;
145 }
146 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
147
148 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
149 {
150 WARN_ON(vcpu->arch.exception.pending);
151 vcpu->arch.exception.pending = true;
152 vcpu->arch.exception.has_error_code = false;
153 vcpu->arch.exception.nr = nr;
154 }
155 EXPORT_SYMBOL_GPL(kvm_queue_exception);
156
157 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
158 u32 error_code)
159 {
160 ++vcpu->stat.pf_guest;
161 if (vcpu->arch.exception.pending) {
162 if (vcpu->arch.exception.nr == PF_VECTOR) {
163 printk(KERN_DEBUG "kvm: inject_page_fault:"
164 " double fault 0x%lx\n", addr);
165 vcpu->arch.exception.nr = DF_VECTOR;
166 vcpu->arch.exception.error_code = 0;
167 } else if (vcpu->arch.exception.nr == DF_VECTOR) {
168 /* triple fault -> shutdown */
169 set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
170 }
171 return;
172 }
173 vcpu->arch.cr2 = addr;
174 kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
175 }
176
177 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
178 {
179 vcpu->arch.nmi_pending = 1;
180 }
181 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
182
183 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
184 {
185 WARN_ON(vcpu->arch.exception.pending);
186 vcpu->arch.exception.pending = true;
187 vcpu->arch.exception.has_error_code = true;
188 vcpu->arch.exception.nr = nr;
189 vcpu->arch.exception.error_code = error_code;
190 }
191 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
192
193 static void __queue_exception(struct kvm_vcpu *vcpu)
194 {
195 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
196 vcpu->arch.exception.has_error_code,
197 vcpu->arch.exception.error_code);
198 }
199
200 /*
201 * Load the pae pdptrs. Return true is they are all valid.
202 */
203 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
204 {
205 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
206 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
207 int i;
208 int ret;
209 u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
210
211 ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
212 offset * sizeof(u64), sizeof(pdpte));
213 if (ret < 0) {
214 ret = 0;
215 goto out;
216 }
217 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
218 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
219 ret = 0;
220 goto out;
221 }
222 }
223 ret = 1;
224
225 memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
226 out:
227
228 return ret;
229 }
230 EXPORT_SYMBOL_GPL(load_pdptrs);
231
232 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
233 {
234 u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
235 bool changed = true;
236 int r;
237
238 if (is_long_mode(vcpu) || !is_pae(vcpu))
239 return false;
240
241 r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
242 if (r < 0)
243 goto out;
244 changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
245 out:
246
247 return changed;
248 }
249
250 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
251 {
252 if (cr0 & CR0_RESERVED_BITS) {
253 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
254 cr0, vcpu->arch.cr0);
255 kvm_inject_gp(vcpu, 0);
256 return;
257 }
258
259 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
260 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
261 kvm_inject_gp(vcpu, 0);
262 return;
263 }
264
265 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
266 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
267 "and a clear PE flag\n");
268 kvm_inject_gp(vcpu, 0);
269 return;
270 }
271
272 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
273 #ifdef CONFIG_X86_64
274 if ((vcpu->arch.shadow_efer & EFER_LME)) {
275 int cs_db, cs_l;
276
277 if (!is_pae(vcpu)) {
278 printk(KERN_DEBUG "set_cr0: #GP, start paging "
279 "in long mode while PAE is disabled\n");
280 kvm_inject_gp(vcpu, 0);
281 return;
282 }
283 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
284 if (cs_l) {
285 printk(KERN_DEBUG "set_cr0: #GP, start paging "
286 "in long mode while CS.L == 1\n");
287 kvm_inject_gp(vcpu, 0);
288 return;
289
290 }
291 } else
292 #endif
293 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
294 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
295 "reserved bits\n");
296 kvm_inject_gp(vcpu, 0);
297 return;
298 }
299
300 }
301
302 kvm_x86_ops->set_cr0(vcpu, cr0);
303 vcpu->arch.cr0 = cr0;
304
305 kvm_mmu_reset_context(vcpu);
306 return;
307 }
308 EXPORT_SYMBOL_GPL(kvm_set_cr0);
309
310 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
311 {
312 kvm_set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
313 KVMTRACE_1D(LMSW, vcpu,
314 (u32)((vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f)),
315 handler);
316 }
317 EXPORT_SYMBOL_GPL(kvm_lmsw);
318
319 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
320 {
321 if (cr4 & CR4_RESERVED_BITS) {
322 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
323 kvm_inject_gp(vcpu, 0);
324 return;
325 }
326
327 if (is_long_mode(vcpu)) {
328 if (!(cr4 & X86_CR4_PAE)) {
329 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
330 "in long mode\n");
331 kvm_inject_gp(vcpu, 0);
332 return;
333 }
334 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
335 && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
336 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
337 kvm_inject_gp(vcpu, 0);
338 return;
339 }
340
341 if (cr4 & X86_CR4_VMXE) {
342 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
343 kvm_inject_gp(vcpu, 0);
344 return;
345 }
346 kvm_x86_ops->set_cr4(vcpu, cr4);
347 vcpu->arch.cr4 = cr4;
348 kvm_mmu_reset_context(vcpu);
349 }
350 EXPORT_SYMBOL_GPL(kvm_set_cr4);
351
352 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
353 {
354 if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
355 kvm_mmu_flush_tlb(vcpu);
356 return;
357 }
358
359 if (is_long_mode(vcpu)) {
360 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
361 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
362 kvm_inject_gp(vcpu, 0);
363 return;
364 }
365 } else {
366 if (is_pae(vcpu)) {
367 if (cr3 & CR3_PAE_RESERVED_BITS) {
368 printk(KERN_DEBUG
369 "set_cr3: #GP, reserved bits\n");
370 kvm_inject_gp(vcpu, 0);
371 return;
372 }
373 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
374 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
375 "reserved bits\n");
376 kvm_inject_gp(vcpu, 0);
377 return;
378 }
379 }
380 /*
381 * We don't check reserved bits in nonpae mode, because
382 * this isn't enforced, and VMware depends on this.
383 */
384 }
385
386 /*
387 * Does the new cr3 value map to physical memory? (Note, we
388 * catch an invalid cr3 even in real-mode, because it would
389 * cause trouble later on when we turn on paging anyway.)
390 *
391 * A real CPU would silently accept an invalid cr3 and would
392 * attempt to use it - with largely undefined (and often hard
393 * to debug) behavior on the guest side.
394 */
395 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
396 kvm_inject_gp(vcpu, 0);
397 else {
398 vcpu->arch.cr3 = cr3;
399 vcpu->arch.mmu.new_cr3(vcpu);
400 }
401 }
402 EXPORT_SYMBOL_GPL(kvm_set_cr3);
403
404 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
405 {
406 if (cr8 & CR8_RESERVED_BITS) {
407 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
408 kvm_inject_gp(vcpu, 0);
409 return;
410 }
411 if (irqchip_in_kernel(vcpu->kvm))
412 kvm_lapic_set_tpr(vcpu, cr8);
413 else
414 vcpu->arch.cr8 = cr8;
415 }
416 EXPORT_SYMBOL_GPL(kvm_set_cr8);
417
418 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
419 {
420 if (irqchip_in_kernel(vcpu->kvm))
421 return kvm_lapic_get_cr8(vcpu);
422 else
423 return vcpu->arch.cr8;
424 }
425 EXPORT_SYMBOL_GPL(kvm_get_cr8);
426
427 /*
428 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
429 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
430 *
431 * This list is modified at module load time to reflect the
432 * capabilities of the host cpu.
433 */
434 static u32 msrs_to_save[] = {
435 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
436 MSR_K6_STAR,
437 #ifdef CONFIG_X86_64
438 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
439 #endif
440 MSR_IA32_TIME_STAMP_COUNTER, MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
441 MSR_IA32_PERF_STATUS,
442 };
443
444 static unsigned num_msrs_to_save;
445
446 static u32 emulated_msrs[] = {
447 MSR_IA32_MISC_ENABLE,
448 };
449
450 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
451 {
452 if (efer & efer_reserved_bits) {
453 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
454 efer);
455 kvm_inject_gp(vcpu, 0);
456 return;
457 }
458
459 if (is_paging(vcpu)
460 && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) {
461 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
462 kvm_inject_gp(vcpu, 0);
463 return;
464 }
465
466 kvm_x86_ops->set_efer(vcpu, efer);
467
468 efer &= ~EFER_LMA;
469 efer |= vcpu->arch.shadow_efer & EFER_LMA;
470
471 vcpu->arch.shadow_efer = efer;
472 }
473
474 void kvm_enable_efer_bits(u64 mask)
475 {
476 efer_reserved_bits &= ~mask;
477 }
478 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
479
480
481 /*
482 * Writes msr value into into the appropriate "register".
483 * Returns 0 on success, non-0 otherwise.
484 * Assumes vcpu_load() was already called.
485 */
486 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
487 {
488 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
489 }
490
491 /*
492 * Adapt set_msr() to msr_io()'s calling convention
493 */
494 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
495 {
496 return kvm_set_msr(vcpu, index, *data);
497 }
498
499 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
500 {
501 static int version;
502 struct pvclock_wall_clock wc;
503 struct timespec now, sys, boot;
504
505 if (!wall_clock)
506 return;
507
508 version++;
509
510 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
511
512 /*
513 * The guest calculates current wall clock time by adding
514 * system time (updated by kvm_write_guest_time below) to the
515 * wall clock specified here. guest system time equals host
516 * system time for us, thus we must fill in host boot time here.
517 */
518 now = current_kernel_time();
519 ktime_get_ts(&sys);
520 boot = ns_to_timespec(timespec_to_ns(&now) - timespec_to_ns(&sys));
521
522 wc.sec = boot.tv_sec;
523 wc.nsec = boot.tv_nsec;
524 wc.version = version;
525
526 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
527
528 version++;
529 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
530 }
531
532 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
533 {
534 uint32_t quotient, remainder;
535
536 /* Don't try to replace with do_div(), this one calculates
537 * "(dividend << 32) / divisor" */
538 __asm__ ( "divl %4"
539 : "=a" (quotient), "=d" (remainder)
540 : "0" (0), "1" (dividend), "r" (divisor) );
541 return quotient;
542 }
543
544 static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock)
545 {
546 uint64_t nsecs = 1000000000LL;
547 int32_t shift = 0;
548 uint64_t tps64;
549 uint32_t tps32;
550
551 tps64 = tsc_khz * 1000LL;
552 while (tps64 > nsecs*2) {
553 tps64 >>= 1;
554 shift--;
555 }
556
557 tps32 = (uint32_t)tps64;
558 while (tps32 <= (uint32_t)nsecs) {
559 tps32 <<= 1;
560 shift++;
561 }
562
563 hv_clock->tsc_shift = shift;
564 hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32);
565
566 pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n",
567 __FUNCTION__, tsc_khz, hv_clock->tsc_shift,
568 hv_clock->tsc_to_system_mul);
569 }
570
571 static void kvm_write_guest_time(struct kvm_vcpu *v)
572 {
573 struct timespec ts;
574 unsigned long flags;
575 struct kvm_vcpu_arch *vcpu = &v->arch;
576 void *shared_kaddr;
577
578 if ((!vcpu->time_page))
579 return;
580
581 if (unlikely(vcpu->hv_clock_tsc_khz != tsc_khz)) {
582 kvm_set_time_scale(tsc_khz, &vcpu->hv_clock);
583 vcpu->hv_clock_tsc_khz = tsc_khz;
584 }
585
586 /* Keep irq disabled to prevent changes to the clock */
587 local_irq_save(flags);
588 kvm_get_msr(v, MSR_IA32_TIME_STAMP_COUNTER,
589 &vcpu->hv_clock.tsc_timestamp);
590 ktime_get_ts(&ts);
591 local_irq_restore(flags);
592
593 /* With all the info we got, fill in the values */
594
595 vcpu->hv_clock.system_time = ts.tv_nsec +
596 (NSEC_PER_SEC * (u64)ts.tv_sec);
597 /*
598 * The interface expects us to write an even number signaling that the
599 * update is finished. Since the guest won't see the intermediate
600 * state, we just increase by 2 at the end.
601 */
602 vcpu->hv_clock.version += 2;
603
604 shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
605
606 memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
607 sizeof(vcpu->hv_clock));
608
609 kunmap_atomic(shared_kaddr, KM_USER0);
610
611 mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
612 }
613
614 static bool msr_mtrr_valid(unsigned msr)
615 {
616 switch (msr) {
617 case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
618 case MSR_MTRRfix64K_00000:
619 case MSR_MTRRfix16K_80000:
620 case MSR_MTRRfix16K_A0000:
621 case MSR_MTRRfix4K_C0000:
622 case MSR_MTRRfix4K_C8000:
623 case MSR_MTRRfix4K_D0000:
624 case MSR_MTRRfix4K_D8000:
625 case MSR_MTRRfix4K_E0000:
626 case MSR_MTRRfix4K_E8000:
627 case MSR_MTRRfix4K_F0000:
628 case MSR_MTRRfix4K_F8000:
629 case MSR_MTRRdefType:
630 case MSR_IA32_CR_PAT:
631 return true;
632 case 0x2f8:
633 return true;
634 }
635 return false;
636 }
637
638 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
639 {
640 if (!msr_mtrr_valid(msr))
641 return 1;
642
643 vcpu->arch.mtrr[msr - 0x200] = data;
644 return 0;
645 }
646
647 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
648 {
649 switch (msr) {
650 case MSR_EFER:
651 set_efer(vcpu, data);
652 break;
653 case MSR_IA32_MC0_STATUS:
654 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
655 __func__, data);
656 break;
657 case MSR_IA32_MCG_STATUS:
658 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
659 __func__, data);
660 break;
661 case MSR_IA32_MCG_CTL:
662 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
663 __func__, data);
664 break;
665 case MSR_IA32_UCODE_REV:
666 case MSR_IA32_UCODE_WRITE:
667 break;
668 case 0x200 ... 0x2ff:
669 return set_msr_mtrr(vcpu, msr, data);
670 case MSR_IA32_APICBASE:
671 kvm_set_apic_base(vcpu, data);
672 break;
673 case MSR_IA32_MISC_ENABLE:
674 vcpu->arch.ia32_misc_enable_msr = data;
675 break;
676 case MSR_KVM_WALL_CLOCK:
677 vcpu->kvm->arch.wall_clock = data;
678 kvm_write_wall_clock(vcpu->kvm, data);
679 break;
680 case MSR_KVM_SYSTEM_TIME: {
681 if (vcpu->arch.time_page) {
682 kvm_release_page_dirty(vcpu->arch.time_page);
683 vcpu->arch.time_page = NULL;
684 }
685
686 vcpu->arch.time = data;
687
688 /* we verify if the enable bit is set... */
689 if (!(data & 1))
690 break;
691
692 /* ...but clean it before doing the actual write */
693 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
694
695 down_read(&current->mm->mmap_sem);
696 vcpu->arch.time_page =
697 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
698 up_read(&current->mm->mmap_sem);
699
700 if (is_error_page(vcpu->arch.time_page)) {
701 kvm_release_page_clean(vcpu->arch.time_page);
702 vcpu->arch.time_page = NULL;
703 }
704
705 kvm_write_guest_time(vcpu);
706 break;
707 }
708 default:
709 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data);
710 return 1;
711 }
712 return 0;
713 }
714 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
715
716
717 /*
718 * Reads an msr value (of 'msr_index') into 'pdata'.
719 * Returns 0 on success, non-0 otherwise.
720 * Assumes vcpu_load() was already called.
721 */
722 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
723 {
724 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
725 }
726
727 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
728 {
729 if (!msr_mtrr_valid(msr))
730 return 1;
731
732 *pdata = vcpu->arch.mtrr[msr - 0x200];
733 return 0;
734 }
735
736 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
737 {
738 u64 data;
739
740 switch (msr) {
741 case 0xc0010010: /* SYSCFG */
742 case 0xc0010015: /* HWCR */
743 case MSR_IA32_PLATFORM_ID:
744 case MSR_IA32_P5_MC_ADDR:
745 case MSR_IA32_P5_MC_TYPE:
746 case MSR_IA32_MC0_CTL:
747 case MSR_IA32_MCG_STATUS:
748 case MSR_IA32_MCG_CAP:
749 case MSR_IA32_MCG_CTL:
750 case MSR_IA32_MC0_MISC:
751 case MSR_IA32_MC0_MISC+4:
752 case MSR_IA32_MC0_MISC+8:
753 case MSR_IA32_MC0_MISC+12:
754 case MSR_IA32_MC0_MISC+16:
755 case MSR_IA32_UCODE_REV:
756 case MSR_IA32_EBL_CR_POWERON:
757 data = 0;
758 break;
759 case MSR_MTRRcap:
760 data = 0x500 | KVM_NR_VAR_MTRR;
761 break;
762 case 0x200 ... 0x2ff:
763 return get_msr_mtrr(vcpu, msr, pdata);
764 case 0xcd: /* fsb frequency */
765 data = 3;
766 break;
767 case MSR_IA32_APICBASE:
768 data = kvm_get_apic_base(vcpu);
769 break;
770 case MSR_IA32_MISC_ENABLE:
771 data = vcpu->arch.ia32_misc_enable_msr;
772 break;
773 case MSR_IA32_PERF_STATUS:
774 /* TSC increment by tick */
775 data = 1000ULL;
776 /* CPU multiplier */
777 data |= (((uint64_t)4ULL) << 40);
778 break;
779 case MSR_EFER:
780 data = vcpu->arch.shadow_efer;
781 break;
782 case MSR_KVM_WALL_CLOCK:
783 data = vcpu->kvm->arch.wall_clock;
784 break;
785 case MSR_KVM_SYSTEM_TIME:
786 data = vcpu->arch.time;
787 break;
788 default:
789 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
790 return 1;
791 }
792 *pdata = data;
793 return 0;
794 }
795 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
796
797 /*
798 * Read or write a bunch of msrs. All parameters are kernel addresses.
799 *
800 * @return number of msrs set successfully.
801 */
802 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
803 struct kvm_msr_entry *entries,
804 int (*do_msr)(struct kvm_vcpu *vcpu,
805 unsigned index, u64 *data))
806 {
807 int i;
808
809 vcpu_load(vcpu);
810
811 down_read(&vcpu->kvm->slots_lock);
812 for (i = 0; i < msrs->nmsrs; ++i)
813 if (do_msr(vcpu, entries[i].index, &entries[i].data))
814 break;
815 up_read(&vcpu->kvm->slots_lock);
816
817 vcpu_put(vcpu);
818
819 return i;
820 }
821
822 /*
823 * Read or write a bunch of msrs. Parameters are user addresses.
824 *
825 * @return number of msrs set successfully.
826 */
827 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
828 int (*do_msr)(struct kvm_vcpu *vcpu,
829 unsigned index, u64 *data),
830 int writeback)
831 {
832 struct kvm_msrs msrs;
833 struct kvm_msr_entry *entries;
834 int r, n;
835 unsigned size;
836
837 r = -EFAULT;
838 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
839 goto out;
840
841 r = -E2BIG;
842 if (msrs.nmsrs >= MAX_IO_MSRS)
843 goto out;
844
845 r = -ENOMEM;
846 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
847 entries = vmalloc(size);
848 if (!entries)
849 goto out;
850
851 r = -EFAULT;
852 if (copy_from_user(entries, user_msrs->entries, size))
853 goto out_free;
854
855 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
856 if (r < 0)
857 goto out_free;
858
859 r = -EFAULT;
860 if (writeback && copy_to_user(user_msrs->entries, entries, size))
861 goto out_free;
862
863 r = n;
864
865 out_free:
866 vfree(entries);
867 out:
868 return r;
869 }
870
871 int kvm_dev_ioctl_check_extension(long ext)
872 {
873 int r;
874
875 switch (ext) {
876 case KVM_CAP_IRQCHIP:
877 case KVM_CAP_HLT:
878 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
879 case KVM_CAP_USER_MEMORY:
880 case KVM_CAP_SET_TSS_ADDR:
881 case KVM_CAP_EXT_CPUID:
882 case KVM_CAP_CLOCKSOURCE:
883 case KVM_CAP_PIT:
884 case KVM_CAP_NOP_IO_DELAY:
885 case KVM_CAP_MP_STATE:
886 r = 1;
887 break;
888 case KVM_CAP_COALESCED_MMIO:
889 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
890 break;
891 case KVM_CAP_VAPIC:
892 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
893 break;
894 case KVM_CAP_NR_VCPUS:
895 r = KVM_MAX_VCPUS;
896 break;
897 case KVM_CAP_NR_MEMSLOTS:
898 r = KVM_MEMORY_SLOTS;
899 break;
900 case KVM_CAP_PV_MMU:
901 r = !tdp_enabled;
902 break;
903 default:
904 r = 0;
905 break;
906 }
907 return r;
908
909 }
910
911 long kvm_arch_dev_ioctl(struct file *filp,
912 unsigned int ioctl, unsigned long arg)
913 {
914 void __user *argp = (void __user *)arg;
915 long r;
916
917 switch (ioctl) {
918 case KVM_GET_MSR_INDEX_LIST: {
919 struct kvm_msr_list __user *user_msr_list = argp;
920 struct kvm_msr_list msr_list;
921 unsigned n;
922
923 r = -EFAULT;
924 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
925 goto out;
926 n = msr_list.nmsrs;
927 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
928 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
929 goto out;
930 r = -E2BIG;
931 if (n < num_msrs_to_save)
932 goto out;
933 r = -EFAULT;
934 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
935 num_msrs_to_save * sizeof(u32)))
936 goto out;
937 if (copy_to_user(user_msr_list->indices
938 + num_msrs_to_save * sizeof(u32),
939 &emulated_msrs,
940 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
941 goto out;
942 r = 0;
943 break;
944 }
945 case KVM_GET_SUPPORTED_CPUID: {
946 struct kvm_cpuid2 __user *cpuid_arg = argp;
947 struct kvm_cpuid2 cpuid;
948
949 r = -EFAULT;
950 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
951 goto out;
952 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
953 cpuid_arg->entries);
954 if (r)
955 goto out;
956
957 r = -EFAULT;
958 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
959 goto out;
960 r = 0;
961 break;
962 }
963 default:
964 r = -EINVAL;
965 }
966 out:
967 return r;
968 }
969
970 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
971 {
972 kvm_x86_ops->vcpu_load(vcpu, cpu);
973 kvm_write_guest_time(vcpu);
974 }
975
976 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
977 {
978 kvm_x86_ops->vcpu_put(vcpu);
979 kvm_put_guest_fpu(vcpu);
980 }
981
982 static int is_efer_nx(void)
983 {
984 u64 efer;
985
986 rdmsrl(MSR_EFER, efer);
987 return efer & EFER_NX;
988 }
989
990 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
991 {
992 int i;
993 struct kvm_cpuid_entry2 *e, *entry;
994
995 entry = NULL;
996 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
997 e = &vcpu->arch.cpuid_entries[i];
998 if (e->function == 0x80000001) {
999 entry = e;
1000 break;
1001 }
1002 }
1003 if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
1004 entry->edx &= ~(1 << 20);
1005 printk(KERN_INFO "kvm: guest NX capability removed\n");
1006 }
1007 }
1008
1009 /* when an old userspace process fills a new kernel module */
1010 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
1011 struct kvm_cpuid *cpuid,
1012 struct kvm_cpuid_entry __user *entries)
1013 {
1014 int r, i;
1015 struct kvm_cpuid_entry *cpuid_entries;
1016
1017 r = -E2BIG;
1018 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1019 goto out;
1020 r = -ENOMEM;
1021 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
1022 if (!cpuid_entries)
1023 goto out;
1024 r = -EFAULT;
1025 if (copy_from_user(cpuid_entries, entries,
1026 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
1027 goto out_free;
1028 for (i = 0; i < cpuid->nent; i++) {
1029 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
1030 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
1031 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
1032 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
1033 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
1034 vcpu->arch.cpuid_entries[i].index = 0;
1035 vcpu->arch.cpuid_entries[i].flags = 0;
1036 vcpu->arch.cpuid_entries[i].padding[0] = 0;
1037 vcpu->arch.cpuid_entries[i].padding[1] = 0;
1038 vcpu->arch.cpuid_entries[i].padding[2] = 0;
1039 }
1040 vcpu->arch.cpuid_nent = cpuid->nent;
1041 cpuid_fix_nx_cap(vcpu);
1042 r = 0;
1043
1044 out_free:
1045 vfree(cpuid_entries);
1046 out:
1047 return r;
1048 }
1049
1050 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
1051 struct kvm_cpuid2 *cpuid,
1052 struct kvm_cpuid_entry2 __user *entries)
1053 {
1054 int r;
1055
1056 r = -E2BIG;
1057 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1058 goto out;
1059 r = -EFAULT;
1060 if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
1061 cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
1062 goto out;
1063 vcpu->arch.cpuid_nent = cpuid->nent;
1064 return 0;
1065
1066 out:
1067 return r;
1068 }
1069
1070 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
1071 struct kvm_cpuid2 *cpuid,
1072 struct kvm_cpuid_entry2 __user *entries)
1073 {
1074 int r;
1075
1076 r = -E2BIG;
1077 if (cpuid->nent < vcpu->arch.cpuid_nent)
1078 goto out;
1079 r = -EFAULT;
1080 if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
1081 vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
1082 goto out;
1083 return 0;
1084
1085 out:
1086 cpuid->nent = vcpu->arch.cpuid_nent;
1087 return r;
1088 }
1089
1090 static inline u32 bit(int bitno)
1091 {
1092 return 1 << (bitno & 31);
1093 }
1094
1095 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1096 u32 index)
1097 {
1098 entry->function = function;
1099 entry->index = index;
1100 cpuid_count(entry->function, entry->index,
1101 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
1102 entry->flags = 0;
1103 }
1104
1105 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1106 u32 index, int *nent, int maxnent)
1107 {
1108 const u32 kvm_supported_word0_x86_features = bit(X86_FEATURE_FPU) |
1109 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
1110 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
1111 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
1112 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
1113 bit(X86_FEATURE_SEP) | bit(X86_FEATURE_PGE) |
1114 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
1115 bit(X86_FEATURE_CLFLSH) | bit(X86_FEATURE_MMX) |
1116 bit(X86_FEATURE_FXSR) | bit(X86_FEATURE_XMM) |
1117 bit(X86_FEATURE_XMM2) | bit(X86_FEATURE_SELFSNOOP);
1118 const u32 kvm_supported_word1_x86_features = bit(X86_FEATURE_FPU) |
1119 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
1120 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
1121 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
1122 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
1123 bit(X86_FEATURE_PGE) |
1124 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
1125 bit(X86_FEATURE_MMX) | bit(X86_FEATURE_FXSR) |
1126 bit(X86_FEATURE_SYSCALL) |
1127 (bit(X86_FEATURE_NX) && is_efer_nx()) |
1128 #ifdef CONFIG_X86_64
1129 bit(X86_FEATURE_LM) |
1130 #endif
1131 bit(X86_FEATURE_MMXEXT) |
1132 bit(X86_FEATURE_3DNOWEXT) |
1133 bit(X86_FEATURE_3DNOW);
1134 const u32 kvm_supported_word3_x86_features =
1135 bit(X86_FEATURE_XMM3) | bit(X86_FEATURE_CX16);
1136 const u32 kvm_supported_word6_x86_features =
1137 bit(X86_FEATURE_LAHF_LM) | bit(X86_FEATURE_CMP_LEGACY);
1138
1139 /* all func 2 cpuid_count() should be called on the same cpu */
1140 get_cpu();
1141 do_cpuid_1_ent(entry, function, index);
1142 ++*nent;
1143
1144 switch (function) {
1145 case 0:
1146 entry->eax = min(entry->eax, (u32)0xb);
1147 break;
1148 case 1:
1149 entry->edx &= kvm_supported_word0_x86_features;
1150 entry->ecx &= kvm_supported_word3_x86_features;
1151 break;
1152 /* function 2 entries are STATEFUL. That is, repeated cpuid commands
1153 * may return different values. This forces us to get_cpu() before
1154 * issuing the first command, and also to emulate this annoying behavior
1155 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
1156 case 2: {
1157 int t, times = entry->eax & 0xff;
1158
1159 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1160 for (t = 1; t < times && *nent < maxnent; ++t) {
1161 do_cpuid_1_ent(&entry[t], function, 0);
1162 entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1163 ++*nent;
1164 }
1165 break;
1166 }
1167 /* function 4 and 0xb have additional index. */
1168 case 4: {
1169 int i, cache_type;
1170
1171 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1172 /* read more entries until cache_type is zero */
1173 for (i = 1; *nent < maxnent; ++i) {
1174 cache_type = entry[i - 1].eax & 0x1f;
1175 if (!cache_type)
1176 break;
1177 do_cpuid_1_ent(&entry[i], function, i);
1178 entry[i].flags |=
1179 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1180 ++*nent;
1181 }
1182 break;
1183 }
1184 case 0xb: {
1185 int i, level_type;
1186
1187 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1188 /* read more entries until level_type is zero */
1189 for (i = 1; *nent < maxnent; ++i) {
1190 level_type = entry[i - 1].ecx & 0xff;
1191 if (!level_type)
1192 break;
1193 do_cpuid_1_ent(&entry[i], function, i);
1194 entry[i].flags |=
1195 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1196 ++*nent;
1197 }
1198 break;
1199 }
1200 case 0x80000000:
1201 entry->eax = min(entry->eax, 0x8000001a);
1202 break;
1203 case 0x80000001:
1204 entry->edx &= kvm_supported_word1_x86_features;
1205 entry->ecx &= kvm_supported_word6_x86_features;
1206 break;
1207 }
1208 put_cpu();
1209 }
1210
1211 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
1212 struct kvm_cpuid_entry2 __user *entries)
1213 {
1214 struct kvm_cpuid_entry2 *cpuid_entries;
1215 int limit, nent = 0, r = -E2BIG;
1216 u32 func;
1217
1218 if (cpuid->nent < 1)
1219 goto out;
1220 r = -ENOMEM;
1221 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
1222 if (!cpuid_entries)
1223 goto out;
1224
1225 do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
1226 limit = cpuid_entries[0].eax;
1227 for (func = 1; func <= limit && nent < cpuid->nent; ++func)
1228 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1229 &nent, cpuid->nent);
1230 r = -E2BIG;
1231 if (nent >= cpuid->nent)
1232 goto out_free;
1233
1234 do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
1235 limit = cpuid_entries[nent - 1].eax;
1236 for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
1237 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1238 &nent, cpuid->nent);
1239 r = -EFAULT;
1240 if (copy_to_user(entries, cpuid_entries,
1241 nent * sizeof(struct kvm_cpuid_entry2)))
1242 goto out_free;
1243 cpuid->nent = nent;
1244 r = 0;
1245
1246 out_free:
1247 vfree(cpuid_entries);
1248 out:
1249 return r;
1250 }
1251
1252 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
1253 struct kvm_lapic_state *s)
1254 {
1255 vcpu_load(vcpu);
1256 memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
1257 vcpu_put(vcpu);
1258
1259 return 0;
1260 }
1261
1262 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
1263 struct kvm_lapic_state *s)
1264 {
1265 vcpu_load(vcpu);
1266 memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1267 kvm_apic_post_state_restore(vcpu);
1268 vcpu_put(vcpu);
1269
1270 return 0;
1271 }
1272
1273 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1274 struct kvm_interrupt *irq)
1275 {
1276 if (irq->irq < 0 || irq->irq >= 256)
1277 return -EINVAL;
1278 if (irqchip_in_kernel(vcpu->kvm))
1279 return -ENXIO;
1280 vcpu_load(vcpu);
1281
1282 set_bit(irq->irq, vcpu->arch.irq_pending);
1283 set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
1284
1285 vcpu_put(vcpu);
1286
1287 return 0;
1288 }
1289
1290 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
1291 struct kvm_tpr_access_ctl *tac)
1292 {
1293 if (tac->flags)
1294 return -EINVAL;
1295 vcpu->arch.tpr_access_reporting = !!tac->enabled;
1296 return 0;
1297 }
1298
1299 long kvm_arch_vcpu_ioctl(struct file *filp,
1300 unsigned int ioctl, unsigned long arg)
1301 {
1302 struct kvm_vcpu *vcpu = filp->private_data;
1303 void __user *argp = (void __user *)arg;
1304 int r;
1305
1306 switch (ioctl) {
1307 case KVM_GET_LAPIC: {
1308 struct kvm_lapic_state lapic;
1309
1310 memset(&lapic, 0, sizeof lapic);
1311 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
1312 if (r)
1313 goto out;
1314 r = -EFAULT;
1315 if (copy_to_user(argp, &lapic, sizeof lapic))
1316 goto out;
1317 r = 0;
1318 break;
1319 }
1320 case KVM_SET_LAPIC: {
1321 struct kvm_lapic_state lapic;
1322
1323 r = -EFAULT;
1324 if (copy_from_user(&lapic, argp, sizeof lapic))
1325 goto out;
1326 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
1327 if (r)
1328 goto out;
1329 r = 0;
1330 break;
1331 }
1332 case KVM_INTERRUPT: {
1333 struct kvm_interrupt irq;
1334
1335 r = -EFAULT;
1336 if (copy_from_user(&irq, argp, sizeof irq))
1337 goto out;
1338 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
1339 if (r)
1340 goto out;
1341 r = 0;
1342 break;
1343 }
1344 case KVM_SET_CPUID: {
1345 struct kvm_cpuid __user *cpuid_arg = argp;
1346 struct kvm_cpuid cpuid;
1347
1348 r = -EFAULT;
1349 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1350 goto out;
1351 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
1352 if (r)
1353 goto out;
1354 break;
1355 }
1356 case KVM_SET_CPUID2: {
1357 struct kvm_cpuid2 __user *cpuid_arg = argp;
1358 struct kvm_cpuid2 cpuid;
1359
1360 r = -EFAULT;
1361 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1362 goto out;
1363 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
1364 cpuid_arg->entries);
1365 if (r)
1366 goto out;
1367 break;
1368 }
1369 case KVM_GET_CPUID2: {
1370 struct kvm_cpuid2 __user *cpuid_arg = argp;
1371 struct kvm_cpuid2 cpuid;
1372
1373 r = -EFAULT;
1374 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1375 goto out;
1376 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
1377 cpuid_arg->entries);
1378 if (r)
1379 goto out;
1380 r = -EFAULT;
1381 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1382 goto out;
1383 r = 0;
1384 break;
1385 }
1386 case KVM_GET_MSRS:
1387 r = msr_io(vcpu, argp, kvm_get_msr, 1);
1388 break;
1389 case KVM_SET_MSRS:
1390 r = msr_io(vcpu, argp, do_set_msr, 0);
1391 break;
1392 case KVM_TPR_ACCESS_REPORTING: {
1393 struct kvm_tpr_access_ctl tac;
1394
1395 r = -EFAULT;
1396 if (copy_from_user(&tac, argp, sizeof tac))
1397 goto out;
1398 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
1399 if (r)
1400 goto out;
1401 r = -EFAULT;
1402 if (copy_to_user(argp, &tac, sizeof tac))
1403 goto out;
1404 r = 0;
1405 break;
1406 };
1407 case KVM_SET_VAPIC_ADDR: {
1408 struct kvm_vapic_addr va;
1409
1410 r = -EINVAL;
1411 if (!irqchip_in_kernel(vcpu->kvm))
1412 goto out;
1413 r = -EFAULT;
1414 if (copy_from_user(&va, argp, sizeof va))
1415 goto out;
1416 r = 0;
1417 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
1418 break;
1419 }
1420 default:
1421 r = -EINVAL;
1422 }
1423 out:
1424 return r;
1425 }
1426
1427 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
1428 {
1429 int ret;
1430
1431 if (addr > (unsigned int)(-3 * PAGE_SIZE))
1432 return -1;
1433 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
1434 return ret;
1435 }
1436
1437 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
1438 u32 kvm_nr_mmu_pages)
1439 {
1440 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
1441 return -EINVAL;
1442
1443 down_write(&kvm->slots_lock);
1444
1445 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1446 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1447
1448 up_write(&kvm->slots_lock);
1449 return 0;
1450 }
1451
1452 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
1453 {
1454 return kvm->arch.n_alloc_mmu_pages;
1455 }
1456
1457 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
1458 {
1459 int i;
1460 struct kvm_mem_alias *alias;
1461
1462 for (i = 0; i < kvm->arch.naliases; ++i) {
1463 alias = &kvm->arch.aliases[i];
1464 if (gfn >= alias->base_gfn
1465 && gfn < alias->base_gfn + alias->npages)
1466 return alias->target_gfn + gfn - alias->base_gfn;
1467 }
1468 return gfn;
1469 }
1470
1471 /*
1472 * Set a new alias region. Aliases map a portion of physical memory into
1473 * another portion. This is useful for memory windows, for example the PC
1474 * VGA region.
1475 */
1476 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
1477 struct kvm_memory_alias *alias)
1478 {
1479 int r, n;
1480 struct kvm_mem_alias *p;
1481
1482 r = -EINVAL;
1483 /* General sanity checks */
1484 if (alias->memory_size & (PAGE_SIZE - 1))
1485 goto out;
1486 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
1487 goto out;
1488 if (alias->slot >= KVM_ALIAS_SLOTS)
1489 goto out;
1490 if (alias->guest_phys_addr + alias->memory_size
1491 < alias->guest_phys_addr)
1492 goto out;
1493 if (alias->target_phys_addr + alias->memory_size
1494 < alias->target_phys_addr)
1495 goto out;
1496
1497 down_write(&kvm->slots_lock);
1498 spin_lock(&kvm->mmu_lock);
1499
1500 p = &kvm->arch.aliases[alias->slot];
1501 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
1502 p->npages = alias->memory_size >> PAGE_SHIFT;
1503 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
1504
1505 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
1506 if (kvm->arch.aliases[n - 1].npages)
1507 break;
1508 kvm->arch.naliases = n;
1509
1510 spin_unlock(&kvm->mmu_lock);
1511 kvm_mmu_zap_all(kvm);
1512
1513 up_write(&kvm->slots_lock);
1514
1515 return 0;
1516
1517 out:
1518 return r;
1519 }
1520
1521 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1522 {
1523 int r;
1524
1525 r = 0;
1526 switch (chip->chip_id) {
1527 case KVM_IRQCHIP_PIC_MASTER:
1528 memcpy(&chip->chip.pic,
1529 &pic_irqchip(kvm)->pics[0],
1530 sizeof(struct kvm_pic_state));
1531 break;
1532 case KVM_IRQCHIP_PIC_SLAVE:
1533 memcpy(&chip->chip.pic,
1534 &pic_irqchip(kvm)->pics[1],
1535 sizeof(struct kvm_pic_state));
1536 break;
1537 case KVM_IRQCHIP_IOAPIC:
1538 memcpy(&chip->chip.ioapic,
1539 ioapic_irqchip(kvm),
1540 sizeof(struct kvm_ioapic_state));
1541 break;
1542 default:
1543 r = -EINVAL;
1544 break;
1545 }
1546 return r;
1547 }
1548
1549 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1550 {
1551 int r;
1552
1553 r = 0;
1554 switch (chip->chip_id) {
1555 case KVM_IRQCHIP_PIC_MASTER:
1556 memcpy(&pic_irqchip(kvm)->pics[0],
1557 &chip->chip.pic,
1558 sizeof(struct kvm_pic_state));
1559 break;
1560 case KVM_IRQCHIP_PIC_SLAVE:
1561 memcpy(&pic_irqchip(kvm)->pics[1],
1562 &chip->chip.pic,
1563 sizeof(struct kvm_pic_state));
1564 break;
1565 case KVM_IRQCHIP_IOAPIC:
1566 memcpy(ioapic_irqchip(kvm),
1567 &chip->chip.ioapic,
1568 sizeof(struct kvm_ioapic_state));
1569 break;
1570 default:
1571 r = -EINVAL;
1572 break;
1573 }
1574 kvm_pic_update_irq(pic_irqchip(kvm));
1575 return r;
1576 }
1577
1578 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
1579 {
1580 int r = 0;
1581
1582 memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
1583 return r;
1584 }
1585
1586 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
1587 {
1588 int r = 0;
1589
1590 memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
1591 kvm_pit_load_count(kvm, 0, ps->channels[0].count);
1592 return r;
1593 }
1594
1595 /*
1596 * Get (and clear) the dirty memory log for a memory slot.
1597 */
1598 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1599 struct kvm_dirty_log *log)
1600 {
1601 int r;
1602 int n;
1603 struct kvm_memory_slot *memslot;
1604 int is_dirty = 0;
1605
1606 down_write(&kvm->slots_lock);
1607
1608 r = kvm_get_dirty_log(kvm, log, &is_dirty);
1609 if (r)
1610 goto out;
1611
1612 /* If nothing is dirty, don't bother messing with page tables. */
1613 if (is_dirty) {
1614 kvm_mmu_slot_remove_write_access(kvm, log->slot);
1615 kvm_flush_remote_tlbs(kvm);
1616 memslot = &kvm->memslots[log->slot];
1617 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1618 memset(memslot->dirty_bitmap, 0, n);
1619 }
1620 r = 0;
1621 out:
1622 up_write(&kvm->slots_lock);
1623 return r;
1624 }
1625
1626 long kvm_arch_vm_ioctl(struct file *filp,
1627 unsigned int ioctl, unsigned long arg)
1628 {
1629 struct kvm *kvm = filp->private_data;
1630 void __user *argp = (void __user *)arg;
1631 int r = -EINVAL;
1632
1633 switch (ioctl) {
1634 case KVM_SET_TSS_ADDR:
1635 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
1636 if (r < 0)
1637 goto out;
1638 break;
1639 case KVM_SET_MEMORY_REGION: {
1640 struct kvm_memory_region kvm_mem;
1641 struct kvm_userspace_memory_region kvm_userspace_mem;
1642
1643 r = -EFAULT;
1644 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1645 goto out;
1646 kvm_userspace_mem.slot = kvm_mem.slot;
1647 kvm_userspace_mem.flags = kvm_mem.flags;
1648 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
1649 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
1650 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
1651 if (r)
1652 goto out;
1653 break;
1654 }
1655 case KVM_SET_NR_MMU_PAGES:
1656 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
1657 if (r)
1658 goto out;
1659 break;
1660 case KVM_GET_NR_MMU_PAGES:
1661 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
1662 break;
1663 case KVM_SET_MEMORY_ALIAS: {
1664 struct kvm_memory_alias alias;
1665
1666 r = -EFAULT;
1667 if (copy_from_user(&alias, argp, sizeof alias))
1668 goto out;
1669 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
1670 if (r)
1671 goto out;
1672 break;
1673 }
1674 case KVM_CREATE_IRQCHIP:
1675 r = -ENOMEM;
1676 kvm->arch.vpic = kvm_create_pic(kvm);
1677 if (kvm->arch.vpic) {
1678 r = kvm_ioapic_init(kvm);
1679 if (r) {
1680 kfree(kvm->arch.vpic);
1681 kvm->arch.vpic = NULL;
1682 goto out;
1683 }
1684 } else
1685 goto out;
1686 break;
1687 case KVM_CREATE_PIT:
1688 r = -ENOMEM;
1689 kvm->arch.vpit = kvm_create_pit(kvm);
1690 if (kvm->arch.vpit)
1691 r = 0;
1692 break;
1693 case KVM_IRQ_LINE: {
1694 struct kvm_irq_level irq_event;
1695
1696 r = -EFAULT;
1697 if (copy_from_user(&irq_event, argp, sizeof irq_event))
1698 goto out;
1699 if (irqchip_in_kernel(kvm)) {
1700 mutex_lock(&kvm->lock);
1701 if (irq_event.irq < 16)
1702 kvm_pic_set_irq(pic_irqchip(kvm),
1703 irq_event.irq,
1704 irq_event.level);
1705 kvm_ioapic_set_irq(kvm->arch.vioapic,
1706 irq_event.irq,
1707 irq_event.level);
1708 mutex_unlock(&kvm->lock);
1709 r = 0;
1710 }
1711 break;
1712 }
1713 case KVM_GET_IRQCHIP: {
1714 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1715 struct kvm_irqchip chip;
1716
1717 r = -EFAULT;
1718 if (copy_from_user(&chip, argp, sizeof chip))
1719 goto out;
1720 r = -ENXIO;
1721 if (!irqchip_in_kernel(kvm))
1722 goto out;
1723 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
1724 if (r)
1725 goto out;
1726 r = -EFAULT;
1727 if (copy_to_user(argp, &chip, sizeof chip))
1728 goto out;
1729 r = 0;
1730 break;
1731 }
1732 case KVM_SET_IRQCHIP: {
1733 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1734 struct kvm_irqchip chip;
1735
1736 r = -EFAULT;
1737 if (copy_from_user(&chip, argp, sizeof chip))
1738 goto out;
1739 r = -ENXIO;
1740 if (!irqchip_in_kernel(kvm))
1741 goto out;
1742 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
1743 if (r)
1744 goto out;
1745 r = 0;
1746 break;
1747 }
1748 case KVM_GET_PIT: {
1749 struct kvm_pit_state ps;
1750 r = -EFAULT;
1751 if (copy_from_user(&ps, argp, sizeof ps))
1752 goto out;
1753 r = -ENXIO;
1754 if (!kvm->arch.vpit)
1755 goto out;
1756 r = kvm_vm_ioctl_get_pit(kvm, &ps);
1757 if (r)
1758 goto out;
1759 r = -EFAULT;
1760 if (copy_to_user(argp, &ps, sizeof ps))
1761 goto out;
1762 r = 0;
1763 break;
1764 }
1765 case KVM_SET_PIT: {
1766 struct kvm_pit_state ps;
1767 r = -EFAULT;
1768 if (copy_from_user(&ps, argp, sizeof ps))
1769 goto out;
1770 r = -ENXIO;
1771 if (!kvm->arch.vpit)
1772 goto out;
1773 r = kvm_vm_ioctl_set_pit(kvm, &ps);
1774 if (r)
1775 goto out;
1776 r = 0;
1777 break;
1778 }
1779 default:
1780 ;
1781 }
1782 out:
1783 return r;
1784 }
1785
1786 static void kvm_init_msr_list(void)
1787 {
1788 u32 dummy[2];
1789 unsigned i, j;
1790
1791 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1792 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1793 continue;
1794 if (j < i)
1795 msrs_to_save[j] = msrs_to_save[i];
1796 j++;
1797 }
1798 num_msrs_to_save = j;
1799 }
1800
1801 /*
1802 * Only apic need an MMIO device hook, so shortcut now..
1803 */
1804 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1805 gpa_t addr, int len,
1806 int is_write)
1807 {
1808 struct kvm_io_device *dev;
1809
1810 if (vcpu->arch.apic) {
1811 dev = &vcpu->arch.apic->dev;
1812 if (dev->in_range(dev, addr, len, is_write))
1813 return dev;
1814 }
1815 return NULL;
1816 }
1817
1818
1819 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1820 gpa_t addr, int len,
1821 int is_write)
1822 {
1823 struct kvm_io_device *dev;
1824
1825 dev = vcpu_find_pervcpu_dev(vcpu, addr, len, is_write);
1826 if (dev == NULL)
1827 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len,
1828 is_write);
1829 return dev;
1830 }
1831
1832 int emulator_read_std(unsigned long addr,
1833 void *val,
1834 unsigned int bytes,
1835 struct kvm_vcpu *vcpu)
1836 {
1837 void *data = val;
1838 int r = X86EMUL_CONTINUE;
1839
1840 while (bytes) {
1841 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1842 unsigned offset = addr & (PAGE_SIZE-1);
1843 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1844 int ret;
1845
1846 if (gpa == UNMAPPED_GVA) {
1847 r = X86EMUL_PROPAGATE_FAULT;
1848 goto out;
1849 }
1850 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1851 if (ret < 0) {
1852 r = X86EMUL_UNHANDLEABLE;
1853 goto out;
1854 }
1855
1856 bytes -= tocopy;
1857 data += tocopy;
1858 addr += tocopy;
1859 }
1860 out:
1861 return r;
1862 }
1863 EXPORT_SYMBOL_GPL(emulator_read_std);
1864
1865 static int emulator_read_emulated(unsigned long addr,
1866 void *val,
1867 unsigned int bytes,
1868 struct kvm_vcpu *vcpu)
1869 {
1870 struct kvm_io_device *mmio_dev;
1871 gpa_t gpa;
1872
1873 if (vcpu->mmio_read_completed) {
1874 memcpy(val, vcpu->mmio_data, bytes);
1875 vcpu->mmio_read_completed = 0;
1876 return X86EMUL_CONTINUE;
1877 }
1878
1879 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1880
1881 /* For APIC access vmexit */
1882 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1883 goto mmio;
1884
1885 if (emulator_read_std(addr, val, bytes, vcpu)
1886 == X86EMUL_CONTINUE)
1887 return X86EMUL_CONTINUE;
1888 if (gpa == UNMAPPED_GVA)
1889 return X86EMUL_PROPAGATE_FAULT;
1890
1891 mmio:
1892 /*
1893 * Is this MMIO handled locally?
1894 */
1895 mutex_lock(&vcpu->kvm->lock);
1896 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 0);
1897 if (mmio_dev) {
1898 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1899 mutex_unlock(&vcpu->kvm->lock);
1900 return X86EMUL_CONTINUE;
1901 }
1902 mutex_unlock(&vcpu->kvm->lock);
1903
1904 vcpu->mmio_needed = 1;
1905 vcpu->mmio_phys_addr = gpa;
1906 vcpu->mmio_size = bytes;
1907 vcpu->mmio_is_write = 0;
1908
1909 return X86EMUL_UNHANDLEABLE;
1910 }
1911
1912 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1913 const void *val, int bytes)
1914 {
1915 int ret;
1916
1917 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
1918 if (ret < 0)
1919 return 0;
1920 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1921 return 1;
1922 }
1923
1924 static int emulator_write_emulated_onepage(unsigned long addr,
1925 const void *val,
1926 unsigned int bytes,
1927 struct kvm_vcpu *vcpu)
1928 {
1929 struct kvm_io_device *mmio_dev;
1930 gpa_t gpa;
1931
1932 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1933
1934 if (gpa == UNMAPPED_GVA) {
1935 kvm_inject_page_fault(vcpu, addr, 2);
1936 return X86EMUL_PROPAGATE_FAULT;
1937 }
1938
1939 /* For APIC access vmexit */
1940 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1941 goto mmio;
1942
1943 if (emulator_write_phys(vcpu, gpa, val, bytes))
1944 return X86EMUL_CONTINUE;
1945
1946 mmio:
1947 /*
1948 * Is this MMIO handled locally?
1949 */
1950 mutex_lock(&vcpu->kvm->lock);
1951 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 1);
1952 if (mmio_dev) {
1953 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1954 mutex_unlock(&vcpu->kvm->lock);
1955 return X86EMUL_CONTINUE;
1956 }
1957 mutex_unlock(&vcpu->kvm->lock);
1958
1959 vcpu->mmio_needed = 1;
1960 vcpu->mmio_phys_addr = gpa;
1961 vcpu->mmio_size = bytes;
1962 vcpu->mmio_is_write = 1;
1963 memcpy(vcpu->mmio_data, val, bytes);
1964
1965 return X86EMUL_CONTINUE;
1966 }
1967
1968 int emulator_write_emulated(unsigned long addr,
1969 const void *val,
1970 unsigned int bytes,
1971 struct kvm_vcpu *vcpu)
1972 {
1973 /* Crossing a page boundary? */
1974 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1975 int rc, now;
1976
1977 now = -addr & ~PAGE_MASK;
1978 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1979 if (rc != X86EMUL_CONTINUE)
1980 return rc;
1981 addr += now;
1982 val += now;
1983 bytes -= now;
1984 }
1985 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1986 }
1987 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1988
1989 static int emulator_cmpxchg_emulated(unsigned long addr,
1990 const void *old,
1991 const void *new,
1992 unsigned int bytes,
1993 struct kvm_vcpu *vcpu)
1994 {
1995 static int reported;
1996
1997 if (!reported) {
1998 reported = 1;
1999 printk(KERN_WARNING "kvm: emulating exchange as write\n");
2000 }
2001 #ifndef CONFIG_X86_64
2002 /* guests cmpxchg8b have to be emulated atomically */
2003 if (bytes == 8) {
2004 gpa_t gpa;
2005 struct page *page;
2006 char *kaddr;
2007 u64 val;
2008
2009 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2010
2011 if (gpa == UNMAPPED_GVA ||
2012 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2013 goto emul_write;
2014
2015 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
2016 goto emul_write;
2017
2018 val = *(u64 *)new;
2019
2020 down_read(&current->mm->mmap_sem);
2021 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
2022 up_read(&current->mm->mmap_sem);
2023
2024 kaddr = kmap_atomic(page, KM_USER0);
2025 set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
2026 kunmap_atomic(kaddr, KM_USER0);
2027 kvm_release_page_dirty(page);
2028 }
2029 emul_write:
2030 #endif
2031
2032 return emulator_write_emulated(addr, new, bytes, vcpu);
2033 }
2034
2035 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
2036 {
2037 return kvm_x86_ops->get_segment_base(vcpu, seg);
2038 }
2039
2040 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
2041 {
2042 return X86EMUL_CONTINUE;
2043 }
2044
2045 int emulate_clts(struct kvm_vcpu *vcpu)
2046 {
2047 KVMTRACE_0D(CLTS, vcpu, handler);
2048 kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
2049 return X86EMUL_CONTINUE;
2050 }
2051
2052 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
2053 {
2054 struct kvm_vcpu *vcpu = ctxt->vcpu;
2055
2056 switch (dr) {
2057 case 0 ... 3:
2058 *dest = kvm_x86_ops->get_dr(vcpu, dr);
2059 return X86EMUL_CONTINUE;
2060 default:
2061 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __func__, dr);
2062 return X86EMUL_UNHANDLEABLE;
2063 }
2064 }
2065
2066 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
2067 {
2068 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
2069 int exception;
2070
2071 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
2072 if (exception) {
2073 /* FIXME: better handling */
2074 return X86EMUL_UNHANDLEABLE;
2075 }
2076 return X86EMUL_CONTINUE;
2077 }
2078
2079 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
2080 {
2081 u8 opcodes[4];
2082 unsigned long rip = vcpu->arch.rip;
2083 unsigned long rip_linear;
2084
2085 if (!printk_ratelimit())
2086 return;
2087
2088 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
2089
2090 emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
2091
2092 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
2093 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
2094 }
2095 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
2096
2097 static struct x86_emulate_ops emulate_ops = {
2098 .read_std = emulator_read_std,
2099 .read_emulated = emulator_read_emulated,
2100 .write_emulated = emulator_write_emulated,
2101 .cmpxchg_emulated = emulator_cmpxchg_emulated,
2102 };
2103
2104 int emulate_instruction(struct kvm_vcpu *vcpu,
2105 struct kvm_run *run,
2106 unsigned long cr2,
2107 u16 error_code,
2108 int emulation_type)
2109 {
2110 int r;
2111 struct decode_cache *c;
2112
2113 vcpu->arch.mmio_fault_cr2 = cr2;
2114 kvm_x86_ops->cache_regs(vcpu);
2115
2116 vcpu->mmio_is_write = 0;
2117 vcpu->arch.pio.string = 0;
2118
2119 if (!(emulation_type & EMULTYPE_NO_DECODE)) {
2120 int cs_db, cs_l;
2121 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
2122
2123 vcpu->arch.emulate_ctxt.vcpu = vcpu;
2124 vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
2125 vcpu->arch.emulate_ctxt.mode =
2126 (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
2127 ? X86EMUL_MODE_REAL : cs_l
2128 ? X86EMUL_MODE_PROT64 : cs_db
2129 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
2130
2131 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2132
2133 /* Reject the instructions other than VMCALL/VMMCALL when
2134 * try to emulate invalid opcode */
2135 c = &vcpu->arch.emulate_ctxt.decode;
2136 if ((emulation_type & EMULTYPE_TRAP_UD) &&
2137 (!(c->twobyte && c->b == 0x01 &&
2138 (c->modrm_reg == 0 || c->modrm_reg == 3) &&
2139 c->modrm_mod == 3 && c->modrm_rm == 1)))
2140 return EMULATE_FAIL;
2141
2142 ++vcpu->stat.insn_emulation;
2143 if (r) {
2144 ++vcpu->stat.insn_emulation_fail;
2145 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2146 return EMULATE_DONE;
2147 return EMULATE_FAIL;
2148 }
2149 }
2150
2151 r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2152
2153 if (vcpu->arch.pio.string)
2154 return EMULATE_DO_MMIO;
2155
2156 if ((r || vcpu->mmio_is_write) && run) {
2157 run->exit_reason = KVM_EXIT_MMIO;
2158 run->mmio.phys_addr = vcpu->mmio_phys_addr;
2159 memcpy(run->mmio.data, vcpu->mmio_data, 8);
2160 run->mmio.len = vcpu->mmio_size;
2161 run->mmio.is_write = vcpu->mmio_is_write;
2162 }
2163
2164 if (r) {
2165 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2166 return EMULATE_DONE;
2167 if (!vcpu->mmio_needed) {
2168 kvm_report_emulation_failure(vcpu, "mmio");
2169 return EMULATE_FAIL;
2170 }
2171 return EMULATE_DO_MMIO;
2172 }
2173
2174 kvm_x86_ops->decache_regs(vcpu);
2175 kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
2176
2177 if (vcpu->mmio_is_write) {
2178 vcpu->mmio_needed = 0;
2179 return EMULATE_DO_MMIO;
2180 }
2181
2182 return EMULATE_DONE;
2183 }
2184 EXPORT_SYMBOL_GPL(emulate_instruction);
2185
2186 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
2187 {
2188 int i;
2189
2190 for (i = 0; i < ARRAY_SIZE(vcpu->arch.pio.guest_pages); ++i)
2191 if (vcpu->arch.pio.guest_pages[i]) {
2192 kvm_release_page_dirty(vcpu->arch.pio.guest_pages[i]);
2193 vcpu->arch.pio.guest_pages[i] = NULL;
2194 }
2195 }
2196
2197 static int pio_copy_data(struct kvm_vcpu *vcpu)
2198 {
2199 void *p = vcpu->arch.pio_data;
2200 void *q;
2201 unsigned bytes;
2202 int nr_pages = vcpu->arch.pio.guest_pages[1] ? 2 : 1;
2203
2204 q = vmap(vcpu->arch.pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
2205 PAGE_KERNEL);
2206 if (!q) {
2207 free_pio_guest_pages(vcpu);
2208 return -ENOMEM;
2209 }
2210 q += vcpu->arch.pio.guest_page_offset;
2211 bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
2212 if (vcpu->arch.pio.in)
2213 memcpy(q, p, bytes);
2214 else
2215 memcpy(p, q, bytes);
2216 q -= vcpu->arch.pio.guest_page_offset;
2217 vunmap(q);
2218 free_pio_guest_pages(vcpu);
2219 return 0;
2220 }
2221
2222 int complete_pio(struct kvm_vcpu *vcpu)
2223 {
2224 struct kvm_pio_request *io = &vcpu->arch.pio;
2225 long delta;
2226 int r;
2227
2228 kvm_x86_ops->cache_regs(vcpu);
2229
2230 if (!io->string) {
2231 if (io->in)
2232 memcpy(&vcpu->arch.regs[VCPU_REGS_RAX], vcpu->arch.pio_data,
2233 io->size);
2234 } else {
2235 if (io->in) {
2236 r = pio_copy_data(vcpu);
2237 if (r) {
2238 kvm_x86_ops->cache_regs(vcpu);
2239 return r;
2240 }
2241 }
2242
2243 delta = 1;
2244 if (io->rep) {
2245 delta *= io->cur_count;
2246 /*
2247 * The size of the register should really depend on
2248 * current address size.
2249 */
2250 vcpu->arch.regs[VCPU_REGS_RCX] -= delta;
2251 }
2252 if (io->down)
2253 delta = -delta;
2254 delta *= io->size;
2255 if (io->in)
2256 vcpu->arch.regs[VCPU_REGS_RDI] += delta;
2257 else
2258 vcpu->arch.regs[VCPU_REGS_RSI] += delta;
2259 }
2260
2261 kvm_x86_ops->decache_regs(vcpu);
2262
2263 io->count -= io->cur_count;
2264 io->cur_count = 0;
2265
2266 return 0;
2267 }
2268
2269 static void kernel_pio(struct kvm_io_device *pio_dev,
2270 struct kvm_vcpu *vcpu,
2271 void *pd)
2272 {
2273 /* TODO: String I/O for in kernel device */
2274
2275 mutex_lock(&vcpu->kvm->lock);
2276 if (vcpu->arch.pio.in)
2277 kvm_iodevice_read(pio_dev, vcpu->arch.pio.port,
2278 vcpu->arch.pio.size,
2279 pd);
2280 else
2281 kvm_iodevice_write(pio_dev, vcpu->arch.pio.port,
2282 vcpu->arch.pio.size,
2283 pd);
2284 mutex_unlock(&vcpu->kvm->lock);
2285 }
2286
2287 static void pio_string_write(struct kvm_io_device *pio_dev,
2288 struct kvm_vcpu *vcpu)
2289 {
2290 struct kvm_pio_request *io = &vcpu->arch.pio;
2291 void *pd = vcpu->arch.pio_data;
2292 int i;
2293
2294 mutex_lock(&vcpu->kvm->lock);
2295 for (i = 0; i < io->cur_count; i++) {
2296 kvm_iodevice_write(pio_dev, io->port,
2297 io->size,
2298 pd);
2299 pd += io->size;
2300 }
2301 mutex_unlock(&vcpu->kvm->lock);
2302 }
2303
2304 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
2305 gpa_t addr, int len,
2306 int is_write)
2307 {
2308 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr, len, is_write);
2309 }
2310
2311 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2312 int size, unsigned port)
2313 {
2314 struct kvm_io_device *pio_dev;
2315
2316 vcpu->run->exit_reason = KVM_EXIT_IO;
2317 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2318 vcpu->run->io.size = vcpu->arch.pio.size = size;
2319 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2320 vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1;
2321 vcpu->run->io.port = vcpu->arch.pio.port = port;
2322 vcpu->arch.pio.in = in;
2323 vcpu->arch.pio.string = 0;
2324 vcpu->arch.pio.down = 0;
2325 vcpu->arch.pio.guest_page_offset = 0;
2326 vcpu->arch.pio.rep = 0;
2327
2328 if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
2329 KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
2330 handler);
2331 else
2332 KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
2333 handler);
2334
2335 kvm_x86_ops->cache_regs(vcpu);
2336 memcpy(vcpu->arch.pio_data, &vcpu->arch.regs[VCPU_REGS_RAX], 4);
2337
2338 kvm_x86_ops->skip_emulated_instruction(vcpu);
2339
2340 pio_dev = vcpu_find_pio_dev(vcpu, port, size, !in);
2341 if (pio_dev) {
2342 kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
2343 complete_pio(vcpu);
2344 return 1;
2345 }
2346 return 0;
2347 }
2348 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
2349
2350 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2351 int size, unsigned long count, int down,
2352 gva_t address, int rep, unsigned port)
2353 {
2354 unsigned now, in_page;
2355 int i, ret = 0;
2356 int nr_pages = 1;
2357 struct page *page;
2358 struct kvm_io_device *pio_dev;
2359
2360 vcpu->run->exit_reason = KVM_EXIT_IO;
2361 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2362 vcpu->run->io.size = vcpu->arch.pio.size = size;
2363 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2364 vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count;
2365 vcpu->run->io.port = vcpu->arch.pio.port = port;
2366 vcpu->arch.pio.in = in;
2367 vcpu->arch.pio.string = 1;
2368 vcpu->arch.pio.down = down;
2369 vcpu->arch.pio.guest_page_offset = offset_in_page(address);
2370 vcpu->arch.pio.rep = rep;
2371
2372 if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
2373 KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
2374 handler);
2375 else
2376 KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
2377 handler);
2378
2379 if (!count) {
2380 kvm_x86_ops->skip_emulated_instruction(vcpu);
2381 return 1;
2382 }
2383
2384 if (!down)
2385 in_page = PAGE_SIZE - offset_in_page(address);
2386 else
2387 in_page = offset_in_page(address) + size;
2388 now = min(count, (unsigned long)in_page / size);
2389 if (!now) {
2390 /*
2391 * String I/O straddles page boundary. Pin two guest pages
2392 * so that we satisfy atomicity constraints. Do just one
2393 * transaction to avoid complexity.
2394 */
2395 nr_pages = 2;
2396 now = 1;
2397 }
2398 if (down) {
2399 /*
2400 * String I/O in reverse. Yuck. Kill the guest, fix later.
2401 */
2402 pr_unimpl(vcpu, "guest string pio down\n");
2403 kvm_inject_gp(vcpu, 0);
2404 return 1;
2405 }
2406 vcpu->run->io.count = now;
2407 vcpu->arch.pio.cur_count = now;
2408
2409 if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
2410 kvm_x86_ops->skip_emulated_instruction(vcpu);
2411
2412 for (i = 0; i < nr_pages; ++i) {
2413 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
2414 vcpu->arch.pio.guest_pages[i] = page;
2415 if (!page) {
2416 kvm_inject_gp(vcpu, 0);
2417 free_pio_guest_pages(vcpu);
2418 return 1;
2419 }
2420 }
2421
2422 pio_dev = vcpu_find_pio_dev(vcpu, port,
2423 vcpu->arch.pio.cur_count,
2424 !vcpu->arch.pio.in);
2425 if (!vcpu->arch.pio.in) {
2426 /* string PIO write */
2427 ret = pio_copy_data(vcpu);
2428 if (ret >= 0 && pio_dev) {
2429 pio_string_write(pio_dev, vcpu);
2430 complete_pio(vcpu);
2431 if (vcpu->arch.pio.count == 0)
2432 ret = 1;
2433 }
2434 } else if (pio_dev)
2435 pr_unimpl(vcpu, "no string pio read support yet, "
2436 "port %x size %d count %ld\n",
2437 port, size, count);
2438
2439 return ret;
2440 }
2441 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
2442
2443 int kvm_arch_init(void *opaque)
2444 {
2445 int r;
2446 struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
2447
2448 if (kvm_x86_ops) {
2449 printk(KERN_ERR "kvm: already loaded the other module\n");
2450 r = -EEXIST;
2451 goto out;
2452 }
2453
2454 if (!ops->cpu_has_kvm_support()) {
2455 printk(KERN_ERR "kvm: no hardware support\n");
2456 r = -EOPNOTSUPP;
2457 goto out;
2458 }
2459 if (ops->disabled_by_bios()) {
2460 printk(KERN_ERR "kvm: disabled by bios\n");
2461 r = -EOPNOTSUPP;
2462 goto out;
2463 }
2464
2465 r = kvm_mmu_module_init();
2466 if (r)
2467 goto out;
2468
2469 kvm_init_msr_list();
2470
2471 kvm_x86_ops = ops;
2472 kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
2473 kvm_mmu_set_base_ptes(PT_PRESENT_MASK);
2474 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
2475 PT_DIRTY_MASK, PT64_NX_MASK, 0);
2476 return 0;
2477
2478 out:
2479 return r;
2480 }
2481
2482 void kvm_arch_exit(void)
2483 {
2484 kvm_x86_ops = NULL;
2485 kvm_mmu_module_exit();
2486 }
2487
2488 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
2489 {
2490 ++vcpu->stat.halt_exits;
2491 KVMTRACE_0D(HLT, vcpu, handler);
2492 if (irqchip_in_kernel(vcpu->kvm)) {
2493 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
2494 up_read(&vcpu->kvm->slots_lock);
2495 kvm_vcpu_block(vcpu);
2496 down_read(&vcpu->kvm->slots_lock);
2497 if (vcpu->arch.mp_state != KVM_MP_STATE_RUNNABLE)
2498 return -EINTR;
2499 return 1;
2500 } else {
2501 vcpu->run->exit_reason = KVM_EXIT_HLT;
2502 return 0;
2503 }
2504 }
2505 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
2506
2507 static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
2508 unsigned long a1)
2509 {
2510 if (is_long_mode(vcpu))
2511 return a0;
2512 else
2513 return a0 | ((gpa_t)a1 << 32);
2514 }
2515
2516 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
2517 {
2518 unsigned long nr, a0, a1, a2, a3, ret;
2519 int r = 1;
2520
2521 kvm_x86_ops->cache_regs(vcpu);
2522
2523 nr = vcpu->arch.regs[VCPU_REGS_RAX];
2524 a0 = vcpu->arch.regs[VCPU_REGS_RBX];
2525 a1 = vcpu->arch.regs[VCPU_REGS_RCX];
2526 a2 = vcpu->arch.regs[VCPU_REGS_RDX];
2527 a3 = vcpu->arch.regs[VCPU_REGS_RSI];
2528
2529 KVMTRACE_1D(VMMCALL, vcpu, (u32)nr, handler);
2530
2531 if (!is_long_mode(vcpu)) {
2532 nr &= 0xFFFFFFFF;
2533 a0 &= 0xFFFFFFFF;
2534 a1 &= 0xFFFFFFFF;
2535 a2 &= 0xFFFFFFFF;
2536 a3 &= 0xFFFFFFFF;
2537 }
2538
2539 switch (nr) {
2540 case KVM_HC_VAPIC_POLL_IRQ:
2541 ret = 0;
2542 break;
2543 case KVM_HC_MMU_OP:
2544 r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
2545 break;
2546 default:
2547 ret = -KVM_ENOSYS;
2548 break;
2549 }
2550 vcpu->arch.regs[VCPU_REGS_RAX] = ret;
2551 kvm_x86_ops->decache_regs(vcpu);
2552 ++vcpu->stat.hypercalls;
2553 return r;
2554 }
2555 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
2556
2557 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
2558 {
2559 char instruction[3];
2560 int ret = 0;
2561
2562
2563 /*
2564 * Blow out the MMU to ensure that no other VCPU has an active mapping
2565 * to ensure that the updated hypercall appears atomically across all
2566 * VCPUs.
2567 */
2568 kvm_mmu_zap_all(vcpu->kvm);
2569
2570 kvm_x86_ops->cache_regs(vcpu);
2571 kvm_x86_ops->patch_hypercall(vcpu, instruction);
2572 if (emulator_write_emulated(vcpu->arch.rip, instruction, 3, vcpu)
2573 != X86EMUL_CONTINUE)
2574 ret = -EFAULT;
2575
2576 return ret;
2577 }
2578
2579 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
2580 {
2581 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
2582 }
2583
2584 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2585 {
2586 struct descriptor_table dt = { limit, base };
2587
2588 kvm_x86_ops->set_gdt(vcpu, &dt);
2589 }
2590
2591 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2592 {
2593 struct descriptor_table dt = { limit, base };
2594
2595 kvm_x86_ops->set_idt(vcpu, &dt);
2596 }
2597
2598 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
2599 unsigned long *rflags)
2600 {
2601 kvm_lmsw(vcpu, msw);
2602 *rflags = kvm_x86_ops->get_rflags(vcpu);
2603 }
2604
2605 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
2606 {
2607 unsigned long value;
2608
2609 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2610 switch (cr) {
2611 case 0:
2612 value = vcpu->arch.cr0;
2613 break;
2614 case 2:
2615 value = vcpu->arch.cr2;
2616 break;
2617 case 3:
2618 value = vcpu->arch.cr3;
2619 break;
2620 case 4:
2621 value = vcpu->arch.cr4;
2622 break;
2623 case 8:
2624 value = kvm_get_cr8(vcpu);
2625 break;
2626 default:
2627 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2628 return 0;
2629 }
2630 KVMTRACE_3D(CR_READ, vcpu, (u32)cr, (u32)value,
2631 (u32)((u64)value >> 32), handler);
2632
2633 return value;
2634 }
2635
2636 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
2637 unsigned long *rflags)
2638 {
2639 KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr, (u32)val,
2640 (u32)((u64)val >> 32), handler);
2641
2642 switch (cr) {
2643 case 0:
2644 kvm_set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
2645 *rflags = kvm_x86_ops->get_rflags(vcpu);
2646 break;
2647 case 2:
2648 vcpu->arch.cr2 = val;
2649 break;
2650 case 3:
2651 kvm_set_cr3(vcpu, val);
2652 break;
2653 case 4:
2654 kvm_set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
2655 break;
2656 case 8:
2657 kvm_set_cr8(vcpu, val & 0xfUL);
2658 break;
2659 default:
2660 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2661 }
2662 }
2663
2664 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
2665 {
2666 struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
2667 int j, nent = vcpu->arch.cpuid_nent;
2668
2669 e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
2670 /* when no next entry is found, the current entry[i] is reselected */
2671 for (j = i + 1; j == i; j = (j + 1) % nent) {
2672 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
2673 if (ej->function == e->function) {
2674 ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2675 return j;
2676 }
2677 }
2678 return 0; /* silence gcc, even though control never reaches here */
2679 }
2680
2681 /* find an entry with matching function, matching index (if needed), and that
2682 * should be read next (if it's stateful) */
2683 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
2684 u32 function, u32 index)
2685 {
2686 if (e->function != function)
2687 return 0;
2688 if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
2689 return 0;
2690 if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
2691 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
2692 return 0;
2693 return 1;
2694 }
2695
2696 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
2697 {
2698 int i;
2699 u32 function, index;
2700 struct kvm_cpuid_entry2 *e, *best;
2701
2702 kvm_x86_ops->cache_regs(vcpu);
2703 function = vcpu->arch.regs[VCPU_REGS_RAX];
2704 index = vcpu->arch.regs[VCPU_REGS_RCX];
2705 vcpu->arch.regs[VCPU_REGS_RAX] = 0;
2706 vcpu->arch.regs[VCPU_REGS_RBX] = 0;
2707 vcpu->arch.regs[VCPU_REGS_RCX] = 0;
2708 vcpu->arch.regs[VCPU_REGS_RDX] = 0;
2709 best = NULL;
2710 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
2711 e = &vcpu->arch.cpuid_entries[i];
2712 if (is_matching_cpuid_entry(e, function, index)) {
2713 if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
2714 move_to_next_stateful_cpuid_entry(vcpu, i);
2715 best = e;
2716 break;
2717 }
2718 /*
2719 * Both basic or both extended?
2720 */
2721 if (((e->function ^ function) & 0x80000000) == 0)
2722 if (!best || e->function > best->function)
2723 best = e;
2724 }
2725 if (best) {
2726 vcpu->arch.regs[VCPU_REGS_RAX] = best->eax;
2727 vcpu->arch.regs[VCPU_REGS_RBX] = best->ebx;
2728 vcpu->arch.regs[VCPU_REGS_RCX] = best->ecx;
2729 vcpu->arch.regs[VCPU_REGS_RDX] = best->edx;
2730 }
2731 kvm_x86_ops->decache_regs(vcpu);
2732 kvm_x86_ops->skip_emulated_instruction(vcpu);
2733 KVMTRACE_5D(CPUID, vcpu, function,
2734 (u32)vcpu->arch.regs[VCPU_REGS_RAX],
2735 (u32)vcpu->arch.regs[VCPU_REGS_RBX],
2736 (u32)vcpu->arch.regs[VCPU_REGS_RCX],
2737 (u32)vcpu->arch.regs[VCPU_REGS_RDX], handler);
2738 }
2739 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
2740
2741 /*
2742 * Check if userspace requested an interrupt window, and that the
2743 * interrupt window is open.
2744 *
2745 * No need to exit to userspace if we already have an interrupt queued.
2746 */
2747 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
2748 struct kvm_run *kvm_run)
2749 {
2750 return (!vcpu->arch.irq_summary &&
2751 kvm_run->request_interrupt_window &&
2752 vcpu->arch.interrupt_window_open &&
2753 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
2754 }
2755
2756 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
2757 struct kvm_run *kvm_run)
2758 {
2759 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
2760 kvm_run->cr8 = kvm_get_cr8(vcpu);
2761 kvm_run->apic_base = kvm_get_apic_base(vcpu);
2762 if (irqchip_in_kernel(vcpu->kvm))
2763 kvm_run->ready_for_interrupt_injection = 1;
2764 else
2765 kvm_run->ready_for_interrupt_injection =
2766 (vcpu->arch.interrupt_window_open &&
2767 vcpu->arch.irq_summary == 0);
2768 }
2769
2770 static void vapic_enter(struct kvm_vcpu *vcpu)
2771 {
2772 struct kvm_lapic *apic = vcpu->arch.apic;
2773 struct page *page;
2774
2775 if (!apic || !apic->vapic_addr)
2776 return;
2777
2778 down_read(&current->mm->mmap_sem);
2779 page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2780 up_read(&current->mm->mmap_sem);
2781
2782 vcpu->arch.apic->vapic_page = page;
2783 }
2784
2785 static void vapic_exit(struct kvm_vcpu *vcpu)
2786 {
2787 struct kvm_lapic *apic = vcpu->arch.apic;
2788
2789 if (!apic || !apic->vapic_addr)
2790 return;
2791
2792 down_read(&vcpu->kvm->slots_lock);
2793 kvm_release_page_dirty(apic->vapic_page);
2794 mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2795 up_read(&vcpu->kvm->slots_lock);
2796 }
2797
2798 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2799 {
2800 int r;
2801
2802 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
2803 pr_debug("vcpu %d received sipi with vector # %x\n",
2804 vcpu->vcpu_id, vcpu->arch.sipi_vector);
2805 kvm_lapic_reset(vcpu);
2806 r = kvm_x86_ops->vcpu_reset(vcpu);
2807 if (r)
2808 return r;
2809 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2810 }
2811
2812 down_read(&vcpu->kvm->slots_lock);
2813 vapic_enter(vcpu);
2814
2815 preempted:
2816 if (vcpu->guest_debug.enabled)
2817 kvm_x86_ops->guest_debug_pre(vcpu);
2818
2819 again:
2820 if (vcpu->requests)
2821 if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
2822 kvm_mmu_unload(vcpu);
2823
2824 r = kvm_mmu_reload(vcpu);
2825 if (unlikely(r))
2826 goto out;
2827
2828 if (vcpu->requests) {
2829 if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
2830 __kvm_migrate_timers(vcpu);
2831 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
2832 kvm_x86_ops->tlb_flush(vcpu);
2833 if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
2834 &vcpu->requests)) {
2835 kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS;
2836 r = 0;
2837 goto out;
2838 }
2839 if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) {
2840 kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
2841 r = 0;
2842 goto out;
2843 }
2844 }
2845
2846 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
2847 kvm_inject_pending_timer_irqs(vcpu);
2848
2849 preempt_disable();
2850
2851 kvm_x86_ops->prepare_guest_switch(vcpu);
2852 kvm_load_guest_fpu(vcpu);
2853
2854 local_irq_disable();
2855
2856 if (vcpu->requests || need_resched()) {
2857 local_irq_enable();
2858 preempt_enable();
2859 r = 1;
2860 goto out;
2861 }
2862
2863 if (signal_pending(current)) {
2864 local_irq_enable();
2865 preempt_enable();
2866 r = -EINTR;
2867 kvm_run->exit_reason = KVM_EXIT_INTR;
2868 ++vcpu->stat.signal_exits;
2869 goto out;
2870 }
2871
2872 vcpu->guest_mode = 1;
2873 /*
2874 * Make sure that guest_mode assignment won't happen after
2875 * testing the pending IRQ vector bitmap.
2876 */
2877 smp_wmb();
2878
2879 if (vcpu->arch.exception.pending)
2880 __queue_exception(vcpu);
2881 else if (irqchip_in_kernel(vcpu->kvm))
2882 kvm_x86_ops->inject_pending_irq(vcpu);
2883 else
2884 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
2885
2886 kvm_lapic_sync_to_vapic(vcpu);
2887
2888 up_read(&vcpu->kvm->slots_lock);
2889
2890 kvm_guest_enter();
2891
2892
2893 KVMTRACE_0D(VMENTRY, vcpu, entryexit);
2894 kvm_x86_ops->run(vcpu, kvm_run);
2895
2896 vcpu->guest_mode = 0;
2897 local_irq_enable();
2898
2899 ++vcpu->stat.exits;
2900
2901 /*
2902 * We must have an instruction between local_irq_enable() and
2903 * kvm_guest_exit(), so the timer interrupt isn't delayed by
2904 * the interrupt shadow. The stat.exits increment will do nicely.
2905 * But we need to prevent reordering, hence this barrier():
2906 */
2907 barrier();
2908
2909 kvm_guest_exit();
2910
2911 preempt_enable();
2912
2913 down_read(&vcpu->kvm->slots_lock);
2914
2915 /*
2916 * Profile KVM exit RIPs:
2917 */
2918 if (unlikely(prof_on == KVM_PROFILING)) {
2919 kvm_x86_ops->cache_regs(vcpu);
2920 profile_hit(KVM_PROFILING, (void *)vcpu->arch.rip);
2921 }
2922
2923 if (vcpu->arch.exception.pending && kvm_x86_ops->exception_injected(vcpu))
2924 vcpu->arch.exception.pending = false;
2925
2926 kvm_lapic_sync_from_vapic(vcpu);
2927
2928 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2929
2930 if (r > 0) {
2931 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2932 r = -EINTR;
2933 kvm_run->exit_reason = KVM_EXIT_INTR;
2934 ++vcpu->stat.request_irq_exits;
2935 goto out;
2936 }
2937 if (!need_resched())
2938 goto again;
2939 }
2940
2941 out:
2942 up_read(&vcpu->kvm->slots_lock);
2943 if (r > 0) {
2944 kvm_resched(vcpu);
2945 down_read(&vcpu->kvm->slots_lock);
2946 goto preempted;
2947 }
2948
2949 post_kvm_run_save(vcpu, kvm_run);
2950
2951 vapic_exit(vcpu);
2952
2953 return r;
2954 }
2955
2956 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2957 {
2958 int r;
2959 sigset_t sigsaved;
2960
2961 vcpu_load(vcpu);
2962
2963 if (vcpu->sigset_active)
2964 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2965
2966 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
2967 kvm_vcpu_block(vcpu);
2968 r = -EAGAIN;
2969 goto out;
2970 }
2971
2972 /* re-sync apic's tpr */
2973 if (!irqchip_in_kernel(vcpu->kvm))
2974 kvm_set_cr8(vcpu, kvm_run->cr8);
2975
2976 if (vcpu->arch.pio.cur_count) {
2977 r = complete_pio(vcpu);
2978 if (r)
2979 goto out;
2980 }
2981 #if CONFIG_HAS_IOMEM
2982 if (vcpu->mmio_needed) {
2983 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2984 vcpu->mmio_read_completed = 1;
2985 vcpu->mmio_needed = 0;
2986
2987 down_read(&vcpu->kvm->slots_lock);
2988 r = emulate_instruction(vcpu, kvm_run,
2989 vcpu->arch.mmio_fault_cr2, 0,
2990 EMULTYPE_NO_DECODE);
2991 up_read(&vcpu->kvm->slots_lock);
2992 if (r == EMULATE_DO_MMIO) {
2993 /*
2994 * Read-modify-write. Back to userspace.
2995 */
2996 r = 0;
2997 goto out;
2998 }
2999 }
3000 #endif
3001 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
3002 kvm_x86_ops->cache_regs(vcpu);
3003 vcpu->arch.regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
3004 kvm_x86_ops->decache_regs(vcpu);
3005 }
3006
3007 r = __vcpu_run(vcpu, kvm_run);
3008
3009 out:
3010 if (vcpu->sigset_active)
3011 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
3012
3013 vcpu_put(vcpu);
3014 return r;
3015 }
3016
3017 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3018 {
3019 vcpu_load(vcpu);
3020
3021 kvm_x86_ops->cache_regs(vcpu);
3022
3023 regs->rax = vcpu->arch.regs[VCPU_REGS_RAX];
3024 regs->rbx = vcpu->arch.regs[VCPU_REGS_RBX];
3025 regs->rcx = vcpu->arch.regs[VCPU_REGS_RCX];
3026 regs->rdx = vcpu->arch.regs[VCPU_REGS_RDX];
3027 regs->rsi = vcpu->arch.regs[VCPU_REGS_RSI];
3028 regs->rdi = vcpu->arch.regs[VCPU_REGS_RDI];
3029 regs->rsp = vcpu->arch.regs[VCPU_REGS_RSP];
3030 regs->rbp = vcpu->arch.regs[VCPU_REGS_RBP];
3031 #ifdef CONFIG_X86_64
3032 regs->r8 = vcpu->arch.regs[VCPU_REGS_R8];
3033 regs->r9 = vcpu->arch.regs[VCPU_REGS_R9];
3034 regs->r10 = vcpu->arch.regs[VCPU_REGS_R10];
3035 regs->r11 = vcpu->arch.regs[VCPU_REGS_R11];
3036 regs->r12 = vcpu->arch.regs[VCPU_REGS_R12];
3037 regs->r13 = vcpu->arch.regs[VCPU_REGS_R13];
3038 regs->r14 = vcpu->arch.regs[VCPU_REGS_R14];
3039 regs->r15 = vcpu->arch.regs[VCPU_REGS_R15];
3040 #endif
3041
3042 regs->rip = vcpu->arch.rip;
3043 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
3044
3045 /*
3046 * Don't leak debug flags in case they were set for guest debugging
3047 */
3048 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
3049 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
3050
3051 vcpu_put(vcpu);
3052
3053 return 0;
3054 }
3055
3056 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3057 {
3058 vcpu_load(vcpu);
3059
3060 vcpu->arch.regs[VCPU_REGS_RAX] = regs->rax;
3061 vcpu->arch.regs[VCPU_REGS_RBX] = regs->rbx;
3062 vcpu->arch.regs[VCPU_REGS_RCX] = regs->rcx;
3063 vcpu->arch.regs[VCPU_REGS_RDX] = regs->rdx;
3064 vcpu->arch.regs[VCPU_REGS_RSI] = regs->rsi;
3065 vcpu->arch.regs[VCPU_REGS_RDI] = regs->rdi;
3066 vcpu->arch.regs[VCPU_REGS_RSP] = regs->rsp;
3067 vcpu->arch.regs[VCPU_REGS_RBP] = regs->rbp;
3068 #ifdef CONFIG_X86_64
3069 vcpu->arch.regs[VCPU_REGS_R8] = regs->r8;
3070 vcpu->arch.regs[VCPU_REGS_R9] = regs->r9;
3071 vcpu->arch.regs[VCPU_REGS_R10] = regs->r10;
3072 vcpu->arch.regs[VCPU_REGS_R11] = regs->r11;
3073 vcpu->arch.regs[VCPU_REGS_R12] = regs->r12;
3074 vcpu->arch.regs[VCPU_REGS_R13] = regs->r13;
3075 vcpu->arch.regs[VCPU_REGS_R14] = regs->r14;
3076 vcpu->arch.regs[VCPU_REGS_R15] = regs->r15;
3077 #endif
3078
3079 vcpu->arch.rip = regs->rip;
3080 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
3081
3082 kvm_x86_ops->decache_regs(vcpu);
3083
3084 vcpu->arch.exception.pending = false;
3085
3086 vcpu_put(vcpu);
3087
3088 return 0;
3089 }
3090
3091 void kvm_get_segment(struct kvm_vcpu *vcpu,
3092 struct kvm_segment *var, int seg)
3093 {
3094 kvm_x86_ops->get_segment(vcpu, var, seg);
3095 }
3096
3097 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
3098 {
3099 struct kvm_segment cs;
3100
3101 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
3102 *db = cs.db;
3103 *l = cs.l;
3104 }
3105 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
3106
3107 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
3108 struct kvm_sregs *sregs)
3109 {
3110 struct descriptor_table dt;
3111 int pending_vec;
3112
3113 vcpu_load(vcpu);
3114
3115 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3116 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3117 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3118 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3119 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3120 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3121
3122 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3123 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3124
3125 kvm_x86_ops->get_idt(vcpu, &dt);
3126 sregs->idt.limit = dt.limit;
3127 sregs->idt.base = dt.base;
3128 kvm_x86_ops->get_gdt(vcpu, &dt);
3129 sregs->gdt.limit = dt.limit;
3130 sregs->gdt.base = dt.base;
3131
3132 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3133 sregs->cr0 = vcpu->arch.cr0;
3134 sregs->cr2 = vcpu->arch.cr2;
3135 sregs->cr3 = vcpu->arch.cr3;
3136 sregs->cr4 = vcpu->arch.cr4;
3137 sregs->cr8 = kvm_get_cr8(vcpu);
3138 sregs->efer = vcpu->arch.shadow_efer;
3139 sregs->apic_base = kvm_get_apic_base(vcpu);
3140
3141 if (irqchip_in_kernel(vcpu->kvm)) {
3142 memset(sregs->interrupt_bitmap, 0,
3143 sizeof sregs->interrupt_bitmap);
3144 pending_vec = kvm_x86_ops->get_irq(vcpu);
3145 if (pending_vec >= 0)
3146 set_bit(pending_vec,
3147 (unsigned long *)sregs->interrupt_bitmap);
3148 } else
3149 memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending,
3150 sizeof sregs->interrupt_bitmap);
3151
3152 vcpu_put(vcpu);
3153
3154 return 0;
3155 }
3156
3157 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
3158 struct kvm_mp_state *mp_state)
3159 {
3160 vcpu_load(vcpu);
3161 mp_state->mp_state = vcpu->arch.mp_state;
3162 vcpu_put(vcpu);
3163 return 0;
3164 }
3165
3166 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
3167 struct kvm_mp_state *mp_state)
3168 {
3169 vcpu_load(vcpu);
3170 vcpu->arch.mp_state = mp_state->mp_state;
3171 vcpu_put(vcpu);
3172 return 0;
3173 }
3174
3175 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3176 struct kvm_segment *var, int seg)
3177 {
3178 kvm_x86_ops->set_segment(vcpu, var, seg);
3179 }
3180
3181 static void seg_desct_to_kvm_desct(struct desc_struct *seg_desc, u16 selector,
3182 struct kvm_segment *kvm_desct)
3183 {
3184 kvm_desct->base = seg_desc->base0;
3185 kvm_desct->base |= seg_desc->base1 << 16;
3186 kvm_desct->base |= seg_desc->base2 << 24;
3187 kvm_desct->limit = seg_desc->limit0;
3188 kvm_desct->limit |= seg_desc->limit << 16;
3189 if (seg_desc->g) {
3190 kvm_desct->limit <<= 12;
3191 kvm_desct->limit |= 0xfff;
3192 }
3193 kvm_desct->selector = selector;
3194 kvm_desct->type = seg_desc->type;
3195 kvm_desct->present = seg_desc->p;
3196 kvm_desct->dpl = seg_desc->dpl;
3197 kvm_desct->db = seg_desc->d;
3198 kvm_desct->s = seg_desc->s;
3199 kvm_desct->l = seg_desc->l;
3200 kvm_desct->g = seg_desc->g;
3201 kvm_desct->avl = seg_desc->avl;
3202 if (!selector)
3203 kvm_desct->unusable = 1;
3204 else
3205 kvm_desct->unusable = 0;
3206 kvm_desct->padding = 0;
3207 }
3208
3209 static void get_segment_descritptor_dtable(struct kvm_vcpu *vcpu,
3210 u16 selector,
3211 struct descriptor_table *dtable)
3212 {
3213 if (selector & 1 << 2) {
3214 struct kvm_segment kvm_seg;
3215
3216 kvm_get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR);
3217
3218 if (kvm_seg.unusable)
3219 dtable->limit = 0;
3220 else
3221 dtable->limit = kvm_seg.limit;
3222 dtable->base = kvm_seg.base;
3223 }
3224 else
3225 kvm_x86_ops->get_gdt(vcpu, dtable);
3226 }
3227
3228 /* allowed just for 8 bytes segments */
3229 static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3230 struct desc_struct *seg_desc)
3231 {
3232 gpa_t gpa;
3233 struct descriptor_table dtable;
3234 u16 index = selector >> 3;
3235
3236 get_segment_descritptor_dtable(vcpu, selector, &dtable);
3237
3238 if (dtable.limit < index * 8 + 7) {
3239 kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
3240 return 1;
3241 }
3242 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
3243 gpa += index * 8;
3244 return kvm_read_guest(vcpu->kvm, gpa, seg_desc, 8);
3245 }
3246
3247 /* allowed just for 8 bytes segments */
3248 static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3249 struct desc_struct *seg_desc)
3250 {
3251 gpa_t gpa;
3252 struct descriptor_table dtable;
3253 u16 index = selector >> 3;
3254
3255 get_segment_descritptor_dtable(vcpu, selector, &dtable);
3256
3257 if (dtable.limit < index * 8 + 7)
3258 return 1;
3259 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
3260 gpa += index * 8;
3261 return kvm_write_guest(vcpu->kvm, gpa, seg_desc, 8);
3262 }
3263
3264 static u32 get_tss_base_addr(struct kvm_vcpu *vcpu,
3265 struct desc_struct *seg_desc)
3266 {
3267 u32 base_addr;
3268
3269 base_addr = seg_desc->base0;
3270 base_addr |= (seg_desc->base1 << 16);
3271 base_addr |= (seg_desc->base2 << 24);
3272
3273 return vcpu->arch.mmu.gva_to_gpa(vcpu, base_addr);
3274 }
3275
3276 static u16 get_segment_selector(struct kvm_vcpu *vcpu, int seg)
3277 {
3278 struct kvm_segment kvm_seg;
3279
3280 kvm_get_segment(vcpu, &kvm_seg, seg);
3281 return kvm_seg.selector;
3282 }
3283
3284 static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu,
3285 u16 selector,
3286 struct kvm_segment *kvm_seg)
3287 {
3288 struct desc_struct seg_desc;
3289
3290 if (load_guest_segment_descriptor(vcpu, selector, &seg_desc))
3291 return 1;
3292 seg_desct_to_kvm_desct(&seg_desc, selector, kvm_seg);
3293 return 0;
3294 }
3295
3296 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3297 int type_bits, int seg)
3298 {
3299 struct kvm_segment kvm_seg;
3300
3301 if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg))
3302 return 1;
3303 kvm_seg.type |= type_bits;
3304
3305 if (seg != VCPU_SREG_SS && seg != VCPU_SREG_CS &&
3306 seg != VCPU_SREG_LDTR)
3307 if (!kvm_seg.s)
3308 kvm_seg.unusable = 1;
3309
3310 kvm_set_segment(vcpu, &kvm_seg, seg);
3311 return 0;
3312 }
3313
3314 static void save_state_to_tss32(struct kvm_vcpu *vcpu,
3315 struct tss_segment_32 *tss)
3316 {
3317 tss->cr3 = vcpu->arch.cr3;
3318 tss->eip = vcpu->arch.rip;
3319 tss->eflags = kvm_x86_ops->get_rflags(vcpu);
3320 tss->eax = vcpu->arch.regs[VCPU_REGS_RAX];
3321 tss->ecx = vcpu->arch.regs[VCPU_REGS_RCX];
3322 tss->edx = vcpu->arch.regs[VCPU_REGS_RDX];
3323 tss->ebx = vcpu->arch.regs[VCPU_REGS_RBX];
3324 tss->esp = vcpu->arch.regs[VCPU_REGS_RSP];
3325 tss->ebp = vcpu->arch.regs[VCPU_REGS_RBP];
3326 tss->esi = vcpu->arch.regs[VCPU_REGS_RSI];
3327 tss->edi = vcpu->arch.regs[VCPU_REGS_RDI];
3328
3329 tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
3330 tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
3331 tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
3332 tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
3333 tss->fs = get_segment_selector(vcpu, VCPU_SREG_FS);
3334 tss->gs = get_segment_selector(vcpu, VCPU_SREG_GS);
3335 tss->ldt_selector = get_segment_selector(vcpu, VCPU_SREG_LDTR);
3336 tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
3337 }
3338
3339 static int load_state_from_tss32(struct kvm_vcpu *vcpu,
3340 struct tss_segment_32 *tss)
3341 {
3342 kvm_set_cr3(vcpu, tss->cr3);
3343
3344 vcpu->arch.rip = tss->eip;
3345 kvm_x86_ops->set_rflags(vcpu, tss->eflags | 2);
3346
3347 vcpu->arch.regs[VCPU_REGS_RAX] = tss->eax;
3348 vcpu->arch.regs[VCPU_REGS_RCX] = tss->ecx;
3349 vcpu->arch.regs[VCPU_REGS_RDX] = tss->edx;
3350 vcpu->arch.regs[VCPU_REGS_RBX] = tss->ebx;
3351 vcpu->arch.regs[VCPU_REGS_RSP] = tss->esp;
3352 vcpu->arch.regs[VCPU_REGS_RBP] = tss->ebp;
3353 vcpu->arch.regs[VCPU_REGS_RSI] = tss->esi;
3354 vcpu->arch.regs[VCPU_REGS_RDI] = tss->edi;
3355
3356 if (kvm_load_segment_descriptor(vcpu, tss->ldt_selector, 0, VCPU_SREG_LDTR))
3357 return 1;
3358
3359 if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3360 return 1;
3361
3362 if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3363 return 1;
3364
3365 if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3366 return 1;
3367
3368 if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3369 return 1;
3370
3371 if (kvm_load_segment_descriptor(vcpu, tss->fs, 1, VCPU_SREG_FS))
3372 return 1;
3373
3374 if (kvm_load_segment_descriptor(vcpu, tss->gs, 1, VCPU_SREG_GS))
3375 return 1;
3376 return 0;
3377 }
3378
3379 static void save_state_to_tss16(struct kvm_vcpu *vcpu,
3380 struct tss_segment_16 *tss)
3381 {
3382 tss->ip = vcpu->arch.rip;
3383 tss->flag = kvm_x86_ops->get_rflags(vcpu);
3384 tss->ax = vcpu->arch.regs[VCPU_REGS_RAX];
3385 tss->cx = vcpu->arch.regs[VCPU_REGS_RCX];
3386 tss->dx = vcpu->arch.regs[VCPU_REGS_RDX];
3387 tss->bx = vcpu->arch.regs[VCPU_REGS_RBX];
3388 tss->sp = vcpu->arch.regs[VCPU_REGS_RSP];
3389 tss->bp = vcpu->arch.regs[VCPU_REGS_RBP];
3390 tss->si = vcpu->arch.regs[VCPU_REGS_RSI];
3391 tss->di = vcpu->arch.regs[VCPU_REGS_RDI];
3392
3393 tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
3394 tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
3395 tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
3396 tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
3397 tss->ldt = get_segment_selector(vcpu, VCPU_SREG_LDTR);
3398 tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
3399 }
3400
3401 static int load_state_from_tss16(struct kvm_vcpu *vcpu,
3402 struct tss_segment_16 *tss)
3403 {
3404 vcpu->arch.rip = tss->ip;
3405 kvm_x86_ops->set_rflags(vcpu, tss->flag | 2);
3406 vcpu->arch.regs[VCPU_REGS_RAX] = tss->ax;
3407 vcpu->arch.regs[VCPU_REGS_RCX] = tss->cx;
3408 vcpu->arch.regs[VCPU_REGS_RDX] = tss->dx;
3409 vcpu->arch.regs[VCPU_REGS_RBX] = tss->bx;
3410 vcpu->arch.regs[VCPU_REGS_RSP] = tss->sp;
3411 vcpu->arch.regs[VCPU_REGS_RBP] = tss->bp;
3412 vcpu->arch.regs[VCPU_REGS_RSI] = tss->si;
3413 vcpu->arch.regs[VCPU_REGS_RDI] = tss->di;
3414
3415 if (kvm_load_segment_descriptor(vcpu, tss->ldt, 0, VCPU_SREG_LDTR))
3416 return 1;
3417
3418 if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3419 return 1;
3420
3421 if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3422 return 1;
3423
3424 if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3425 return 1;
3426
3427 if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3428 return 1;
3429 return 0;
3430 }
3431
3432 static int kvm_task_switch_16(struct kvm_vcpu *vcpu, u16 tss_selector,
3433 u32 old_tss_base,
3434 struct desc_struct *nseg_desc)
3435 {
3436 struct tss_segment_16 tss_segment_16;
3437 int ret = 0;
3438
3439 if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
3440 sizeof tss_segment_16))
3441 goto out;
3442
3443 save_state_to_tss16(vcpu, &tss_segment_16);
3444
3445 if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
3446 sizeof tss_segment_16))
3447 goto out;
3448
3449 if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
3450 &tss_segment_16, sizeof tss_segment_16))
3451 goto out;
3452
3453 if (load_state_from_tss16(vcpu, &tss_segment_16))
3454 goto out;
3455
3456 ret = 1;
3457 out:
3458 return ret;
3459 }
3460
3461 static int kvm_task_switch_32(struct kvm_vcpu *vcpu, u16 tss_selector,
3462 u32 old_tss_base,
3463 struct desc_struct *nseg_desc)
3464 {
3465 struct tss_segment_32 tss_segment_32;
3466 int ret = 0;
3467
3468 if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
3469 sizeof tss_segment_32))
3470 goto out;
3471
3472 save_state_to_tss32(vcpu, &tss_segment_32);
3473
3474 if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
3475 sizeof tss_segment_32))
3476 goto out;
3477
3478 if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
3479 &tss_segment_32, sizeof tss_segment_32))
3480 goto out;
3481
3482 if (load_state_from_tss32(vcpu, &tss_segment_32))
3483 goto out;
3484
3485 ret = 1;
3486 out:
3487 return ret;
3488 }
3489
3490 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
3491 {
3492 struct kvm_segment tr_seg;
3493 struct desc_struct cseg_desc;
3494 struct desc_struct nseg_desc;
3495 int ret = 0;
3496 u32 old_tss_base = get_segment_base(vcpu, VCPU_SREG_TR);
3497 u16 old_tss_sel = get_segment_selector(vcpu, VCPU_SREG_TR);
3498
3499 old_tss_base = vcpu->arch.mmu.gva_to_gpa(vcpu, old_tss_base);
3500
3501 /* FIXME: Handle errors. Failure to read either TSS or their
3502 * descriptors should generate a pagefault.
3503 */
3504 if (load_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc))
3505 goto out;
3506
3507 if (load_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc))
3508 goto out;
3509
3510 if (reason != TASK_SWITCH_IRET) {
3511 int cpl;
3512
3513 cpl = kvm_x86_ops->get_cpl(vcpu);
3514 if ((tss_selector & 3) > nseg_desc.dpl || cpl > nseg_desc.dpl) {
3515 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
3516 return 1;
3517 }
3518 }
3519
3520 if (!nseg_desc.p || (nseg_desc.limit0 | nseg_desc.limit << 16) < 0x67) {
3521 kvm_queue_exception_e(vcpu, TS_VECTOR, tss_selector & 0xfffc);
3522 return 1;
3523 }
3524
3525 if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
3526 cseg_desc.type &= ~(1 << 1); //clear the B flag
3527 save_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc);
3528 }
3529
3530 if (reason == TASK_SWITCH_IRET) {
3531 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
3532 kvm_x86_ops->set_rflags(vcpu, eflags & ~X86_EFLAGS_NT);
3533 }
3534
3535 kvm_x86_ops->skip_emulated_instruction(vcpu);
3536 kvm_x86_ops->cache_regs(vcpu);
3537
3538 if (nseg_desc.type & 8)
3539 ret = kvm_task_switch_32(vcpu, tss_selector, old_tss_base,
3540 &nseg_desc);
3541 else
3542 ret = kvm_task_switch_16(vcpu, tss_selector, old_tss_base,
3543 &nseg_desc);
3544
3545 if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) {
3546 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
3547 kvm_x86_ops->set_rflags(vcpu, eflags | X86_EFLAGS_NT);
3548 }
3549
3550 if (reason != TASK_SWITCH_IRET) {
3551 nseg_desc.type |= (1 << 1);
3552 save_guest_segment_descriptor(vcpu, tss_selector,
3553 &nseg_desc);
3554 }
3555
3556 kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 | X86_CR0_TS);
3557 seg_desct_to_kvm_desct(&nseg_desc, tss_selector, &tr_seg);
3558 tr_seg.type = 11;
3559 kvm_set_segment(vcpu, &tr_seg, VCPU_SREG_TR);
3560 out:
3561 kvm_x86_ops->decache_regs(vcpu);
3562 return ret;
3563 }
3564 EXPORT_SYMBOL_GPL(kvm_task_switch);
3565
3566 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
3567 struct kvm_sregs *sregs)
3568 {
3569 int mmu_reset_needed = 0;
3570 int i, pending_vec, max_bits;
3571 struct descriptor_table dt;
3572
3573 vcpu_load(vcpu);
3574
3575 dt.limit = sregs->idt.limit;
3576 dt.base = sregs->idt.base;
3577 kvm_x86_ops->set_idt(vcpu, &dt);
3578 dt.limit = sregs->gdt.limit;
3579 dt.base = sregs->gdt.base;
3580 kvm_x86_ops->set_gdt(vcpu, &dt);
3581
3582 vcpu->arch.cr2 = sregs->cr2;
3583 mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
3584 vcpu->arch.cr3 = sregs->cr3;
3585
3586 kvm_set_cr8(vcpu, sregs->cr8);
3587
3588 mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
3589 kvm_x86_ops->set_efer(vcpu, sregs->efer);
3590 kvm_set_apic_base(vcpu, sregs->apic_base);
3591
3592 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3593
3594 mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
3595 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
3596 vcpu->arch.cr0 = sregs->cr0;
3597
3598 mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
3599 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
3600 if (!is_long_mode(vcpu) && is_pae(vcpu))
3601 load_pdptrs(vcpu, vcpu->arch.cr3);
3602
3603 if (mmu_reset_needed)
3604 kvm_mmu_reset_context(vcpu);
3605
3606 if (!irqchip_in_kernel(vcpu->kvm)) {
3607 memcpy(vcpu->arch.irq_pending, sregs->interrupt_bitmap,
3608 sizeof vcpu->arch.irq_pending);
3609 vcpu->arch.irq_summary = 0;
3610 for (i = 0; i < ARRAY_SIZE(vcpu->arch.irq_pending); ++i)
3611 if (vcpu->arch.irq_pending[i])
3612 __set_bit(i, &vcpu->arch.irq_summary);
3613 } else {
3614 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
3615 pending_vec = find_first_bit(
3616 (const unsigned long *)sregs->interrupt_bitmap,
3617 max_bits);
3618 /* Only pending external irq is handled here */
3619 if (pending_vec < max_bits) {
3620 kvm_x86_ops->set_irq(vcpu, pending_vec);
3621 pr_debug("Set back pending irq %d\n",
3622 pending_vec);
3623 }
3624 }
3625
3626 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3627 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3628 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3629 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3630 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3631 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3632
3633 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3634 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3635
3636 vcpu_put(vcpu);
3637
3638 return 0;
3639 }
3640
3641 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
3642 struct kvm_debug_guest *dbg)
3643 {
3644 int r;
3645
3646 vcpu_load(vcpu);
3647
3648 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
3649
3650 vcpu_put(vcpu);
3651
3652 return r;
3653 }
3654
3655 /*
3656 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
3657 * we have asm/x86/processor.h
3658 */
3659 struct fxsave {
3660 u16 cwd;
3661 u16 swd;
3662 u16 twd;
3663 u16 fop;
3664 u64 rip;
3665 u64 rdp;
3666 u32 mxcsr;
3667 u32 mxcsr_mask;
3668 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
3669 #ifdef CONFIG_X86_64
3670 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
3671 #else
3672 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
3673 #endif
3674 };
3675
3676 /*
3677 * Translate a guest virtual address to a guest physical address.
3678 */
3679 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
3680 struct kvm_translation *tr)
3681 {
3682 unsigned long vaddr = tr->linear_address;
3683 gpa_t gpa;
3684
3685 vcpu_load(vcpu);
3686 down_read(&vcpu->kvm->slots_lock);
3687 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
3688 up_read(&vcpu->kvm->slots_lock);
3689 tr->physical_address = gpa;
3690 tr->valid = gpa != UNMAPPED_GVA;
3691 tr->writeable = 1;
3692 tr->usermode = 0;
3693 vcpu_put(vcpu);
3694
3695 return 0;
3696 }
3697
3698 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3699 {
3700 struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
3701
3702 vcpu_load(vcpu);
3703
3704 memcpy(fpu->fpr, fxsave->st_space, 128);
3705 fpu->fcw = fxsave->cwd;
3706 fpu->fsw = fxsave->swd;
3707 fpu->ftwx = fxsave->twd;
3708 fpu->last_opcode = fxsave->fop;
3709 fpu->last_ip = fxsave->rip;
3710 fpu->last_dp = fxsave->rdp;
3711 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
3712
3713 vcpu_put(vcpu);
3714
3715 return 0;
3716 }
3717
3718 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3719 {
3720 struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
3721
3722 vcpu_load(vcpu);
3723
3724 memcpy(fxsave->st_space, fpu->fpr, 128);
3725 fxsave->cwd = fpu->fcw;
3726 fxsave->swd = fpu->fsw;
3727 fxsave->twd = fpu->ftwx;
3728 fxsave->fop = fpu->last_opcode;
3729 fxsave->rip = fpu->last_ip;
3730 fxsave->rdp = fpu->last_dp;
3731 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
3732
3733 vcpu_put(vcpu);
3734
3735 return 0;
3736 }
3737
3738 void fx_init(struct kvm_vcpu *vcpu)
3739 {
3740 unsigned after_mxcsr_mask;
3741
3742 /*
3743 * Touch the fpu the first time in non atomic context as if
3744 * this is the first fpu instruction the exception handler
3745 * will fire before the instruction returns and it'll have to
3746 * allocate ram with GFP_KERNEL.
3747 */
3748 if (!used_math())
3749 kvm_fx_save(&vcpu->arch.host_fx_image);
3750
3751 /* Initialize guest FPU by resetting ours and saving into guest's */
3752 preempt_disable();
3753 kvm_fx_save(&vcpu->arch.host_fx_image);
3754 kvm_fx_finit();
3755 kvm_fx_save(&vcpu->arch.guest_fx_image);
3756 kvm_fx_restore(&vcpu->arch.host_fx_image);
3757 preempt_enable();
3758
3759 vcpu->arch.cr0 |= X86_CR0_ET;
3760 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
3761 vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
3762 memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
3763 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
3764 }
3765 EXPORT_SYMBOL_GPL(fx_init);
3766
3767 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
3768 {
3769 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
3770 return;
3771
3772 vcpu->guest_fpu_loaded = 1;
3773 kvm_fx_save(&vcpu->arch.host_fx_image);
3774 kvm_fx_restore(&vcpu->arch.guest_fx_image);
3775 }
3776 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
3777
3778 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
3779 {
3780 if (!vcpu->guest_fpu_loaded)
3781 return;
3782
3783 vcpu->guest_fpu_loaded = 0;
3784 kvm_fx_save(&vcpu->arch.guest_fx_image);
3785 kvm_fx_restore(&vcpu->arch.host_fx_image);
3786 ++vcpu->stat.fpu_reload;
3787 }
3788 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
3789
3790 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
3791 {
3792 kvm_x86_ops->vcpu_free(vcpu);
3793 }
3794
3795 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
3796 unsigned int id)
3797 {
3798 return kvm_x86_ops->vcpu_create(kvm, id);
3799 }
3800
3801 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
3802 {
3803 int r;
3804
3805 /* We do fxsave: this must be aligned. */
3806 BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
3807
3808 vcpu_load(vcpu);
3809 r = kvm_arch_vcpu_reset(vcpu);
3810 if (r == 0)
3811 r = kvm_mmu_setup(vcpu);
3812 vcpu_put(vcpu);
3813 if (r < 0)
3814 goto free_vcpu;
3815
3816 return 0;
3817 free_vcpu:
3818 kvm_x86_ops->vcpu_free(vcpu);
3819 return r;
3820 }
3821
3822 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
3823 {
3824 vcpu_load(vcpu);
3825 kvm_mmu_unload(vcpu);
3826 vcpu_put(vcpu);
3827
3828 kvm_x86_ops->vcpu_free(vcpu);
3829 }
3830
3831 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
3832 {
3833 return kvm_x86_ops->vcpu_reset(vcpu);
3834 }
3835
3836 void kvm_arch_hardware_enable(void *garbage)
3837 {
3838 kvm_x86_ops->hardware_enable(garbage);
3839 }
3840
3841 void kvm_arch_hardware_disable(void *garbage)
3842 {
3843 kvm_x86_ops->hardware_disable(garbage);
3844 }
3845
3846 int kvm_arch_hardware_setup(void)
3847 {
3848 return kvm_x86_ops->hardware_setup();
3849 }
3850
3851 void kvm_arch_hardware_unsetup(void)
3852 {
3853 kvm_x86_ops->hardware_unsetup();
3854 }
3855
3856 void kvm_arch_check_processor_compat(void *rtn)
3857 {
3858 kvm_x86_ops->check_processor_compatibility(rtn);
3859 }
3860
3861 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
3862 {
3863 struct page *page;
3864 struct kvm *kvm;
3865 int r;
3866
3867 BUG_ON(vcpu->kvm == NULL);
3868 kvm = vcpu->kvm;
3869
3870 vcpu->arch.mmu.root_hpa = INVALID_PAGE;
3871 if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
3872 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
3873 else
3874 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
3875
3876 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3877 if (!page) {
3878 r = -ENOMEM;
3879 goto fail;
3880 }
3881 vcpu->arch.pio_data = page_address(page);
3882
3883 r = kvm_mmu_create(vcpu);
3884 if (r < 0)
3885 goto fail_free_pio_data;
3886
3887 if (irqchip_in_kernel(kvm)) {
3888 r = kvm_create_lapic(vcpu);
3889 if (r < 0)
3890 goto fail_mmu_destroy;
3891 }
3892
3893 return 0;
3894
3895 fail_mmu_destroy:
3896 kvm_mmu_destroy(vcpu);
3897 fail_free_pio_data:
3898 free_page((unsigned long)vcpu->arch.pio_data);
3899 fail:
3900 return r;
3901 }
3902
3903 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
3904 {
3905 kvm_free_lapic(vcpu);
3906 down_read(&vcpu->kvm->slots_lock);
3907 kvm_mmu_destroy(vcpu);
3908 up_read(&vcpu->kvm->slots_lock);
3909 free_page((unsigned long)vcpu->arch.pio_data);
3910 }
3911
3912 struct kvm *kvm_arch_create_vm(void)
3913 {
3914 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
3915
3916 if (!kvm)
3917 return ERR_PTR(-ENOMEM);
3918
3919 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
3920
3921 return kvm;
3922 }
3923
3924 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
3925 {
3926 vcpu_load(vcpu);
3927 kvm_mmu_unload(vcpu);
3928 vcpu_put(vcpu);
3929 }
3930
3931 static void kvm_free_vcpus(struct kvm *kvm)
3932 {
3933 unsigned int i;
3934
3935 /*
3936 * Unpin any mmu pages first.
3937 */
3938 for (i = 0; i < KVM_MAX_VCPUS; ++i)
3939 if (kvm->vcpus[i])
3940 kvm_unload_vcpu_mmu(kvm->vcpus[i]);
3941 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3942 if (kvm->vcpus[i]) {
3943 kvm_arch_vcpu_free(kvm->vcpus[i]);
3944 kvm->vcpus[i] = NULL;
3945 }
3946 }
3947
3948 }
3949
3950 void kvm_arch_destroy_vm(struct kvm *kvm)
3951 {
3952 kvm_free_pit(kvm);
3953 kfree(kvm->arch.vpic);
3954 kfree(kvm->arch.vioapic);
3955 kvm_free_vcpus(kvm);
3956 kvm_free_physmem(kvm);
3957 if (kvm->arch.apic_access_page)
3958 put_page(kvm->arch.apic_access_page);
3959 if (kvm->arch.ept_identity_pagetable)
3960 put_page(kvm->arch.ept_identity_pagetable);
3961 kfree(kvm);
3962 }
3963
3964 int kvm_arch_set_memory_region(struct kvm *kvm,
3965 struct kvm_userspace_memory_region *mem,
3966 struct kvm_memory_slot old,
3967 int user_alloc)
3968 {
3969 int npages = mem->memory_size >> PAGE_SHIFT;
3970 struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
3971
3972 /*To keep backward compatibility with older userspace,
3973 *x86 needs to hanlde !user_alloc case.
3974 */
3975 if (!user_alloc) {
3976 if (npages && !old.rmap) {
3977 unsigned long userspace_addr;
3978
3979 down_write(&current->mm->mmap_sem);
3980 userspace_addr = do_mmap(NULL, 0,
3981 npages * PAGE_SIZE,
3982 PROT_READ | PROT_WRITE,
3983 MAP_SHARED | MAP_ANONYMOUS,
3984 0);
3985 up_write(&current->mm->mmap_sem);
3986
3987 if (IS_ERR((void *)userspace_addr))
3988 return PTR_ERR((void *)userspace_addr);
3989
3990 /* set userspace_addr atomically for kvm_hva_to_rmapp */
3991 spin_lock(&kvm->mmu_lock);
3992 memslot->userspace_addr = userspace_addr;
3993 spin_unlock(&kvm->mmu_lock);
3994 } else {
3995 if (!old.user_alloc && old.rmap) {
3996 int ret;
3997
3998 down_write(&current->mm->mmap_sem);
3999 ret = do_munmap(current->mm, old.userspace_addr,
4000 old.npages * PAGE_SIZE);
4001 up_write(&current->mm->mmap_sem);
4002 if (ret < 0)
4003 printk(KERN_WARNING
4004 "kvm_vm_ioctl_set_memory_region: "
4005 "failed to munmap memory\n");
4006 }
4007 }
4008 }
4009
4010 if (!kvm->arch.n_requested_mmu_pages) {
4011 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
4012 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
4013 }
4014
4015 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
4016 kvm_flush_remote_tlbs(kvm);
4017
4018 return 0;
4019 }
4020
4021 void kvm_arch_flush_shadow(struct kvm *kvm)
4022 {
4023 kvm_mmu_zap_all(kvm);
4024 }
4025
4026 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
4027 {
4028 return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
4029 || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED;
4030 }
4031
4032 static void vcpu_kick_intr(void *info)
4033 {
4034 #ifdef DEBUG
4035 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
4036 printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
4037 #endif
4038 }
4039
4040 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
4041 {
4042 int ipi_pcpu = vcpu->cpu;
4043 int cpu = get_cpu();
4044
4045 if (waitqueue_active(&vcpu->wq)) {
4046 wake_up_interruptible(&vcpu->wq);
4047 ++vcpu->stat.halt_wakeup;
4048 }
4049 /*
4050 * We may be called synchronously with irqs disabled in guest mode,
4051 * So need not to call smp_call_function_single() in that case.
4052 */
4053 if (vcpu->guest_mode && vcpu->cpu != cpu)
4054 smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0);
4055 put_cpu();
4056 }
Linux kernel - Deliverables
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