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KVM: Keep control regs in sync
[linux-2.6/mini2440.git] / drivers / kvm / kvm_main.c
blob7341c0949340e0083469cff085f7dd915c582f49
1 /*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18 #include "kvm.h"
19 #include "x86_emulate.h"
20 #include "segment_descriptor.h"
21 #include "irq.h"
22
23 #include <linux/kvm.h>
24 #include <linux/module.h>
25 #include <linux/errno.h>
26 #include <linux/percpu.h>
27 #include <linux/gfp.h>
28 #include <linux/mm.h>
29 #include <linux/miscdevice.h>
30 #include <linux/vmalloc.h>
31 #include <linux/reboot.h>
32 #include <linux/debugfs.h>
33 #include <linux/highmem.h>
34 #include <linux/file.h>
35 #include <linux/sysdev.h>
36 #include <linux/cpu.h>
37 #include <linux/sched.h>
38 #include <linux/cpumask.h>
39 #include <linux/smp.h>
40 #include <linux/anon_inodes.h>
41
42 #include <asm/processor.h>
43 #include <asm/msr.h>
44 #include <asm/io.h>
45 #include <asm/uaccess.h>
46 #include <asm/desc.h>
47
48 MODULE_AUTHOR("Qumranet");
49 MODULE_LICENSE("GPL");
50
51 static DEFINE_SPINLOCK(kvm_lock);
52 static LIST_HEAD(vm_list);
53
54 static cpumask_t cpus_hardware_enabled;
55
56 struct kvm_arch_ops *kvm_arch_ops;
57 struct kmem_cache *kvm_vcpu_cache;
58 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
59
60 static __read_mostly struct preempt_ops kvm_preempt_ops;
61
62 #define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
63
64 static struct kvm_stats_debugfs_item {
65 const char *name;
66 int offset;
67 struct dentry *dentry;
68 } debugfs_entries[] = {
69 { "pf_fixed", STAT_OFFSET(pf_fixed) },
70 { "pf_guest", STAT_OFFSET(pf_guest) },
71 { "tlb_flush", STAT_OFFSET(tlb_flush) },
72 { "invlpg", STAT_OFFSET(invlpg) },
73 { "exits", STAT_OFFSET(exits) },
74 { "io_exits", STAT_OFFSET(io_exits) },
75 { "mmio_exits", STAT_OFFSET(mmio_exits) },
76 { "signal_exits", STAT_OFFSET(signal_exits) },
77 { "irq_window", STAT_OFFSET(irq_window_exits) },
78 { "halt_exits", STAT_OFFSET(halt_exits) },
79 { "halt_wakeup", STAT_OFFSET(halt_wakeup) },
80 { "request_irq", STAT_OFFSET(request_irq_exits) },
81 { "irq_exits", STAT_OFFSET(irq_exits) },
82 { "light_exits", STAT_OFFSET(light_exits) },
83 { "efer_reload", STAT_OFFSET(efer_reload) },
84 { NULL }
85 };
86
87 static struct dentry *debugfs_dir;
88
89 #define MAX_IO_MSRS 256
90
91 #define CR0_RESERVED_BITS \
92 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
93 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
94 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
95 #define CR4_RESERVED_BITS \
96 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
97 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
98 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
99 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
100
101 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
102 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
103
104 #ifdef CONFIG_X86_64
105 // LDT or TSS descriptor in the GDT. 16 bytes.
106 struct segment_descriptor_64 {
107 struct segment_descriptor s;
108 u32 base_higher;
109 u32 pad_zero;
110 };
111
112 #endif
113
114 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
115 unsigned long arg);
116
117 unsigned long segment_base(u16 selector)
118 {
119 struct descriptor_table gdt;
120 struct segment_descriptor *d;
121 unsigned long table_base;
122 typedef unsigned long ul;
123 unsigned long v;
124
125 if (selector == 0)
126 return 0;
127
128 asm ("sgdt %0" : "=m"(gdt));
129 table_base = gdt.base;
130
131 if (selector & 4) { /* from ldt */
132 u16 ldt_selector;
133
134 asm ("sldt %0" : "=g"(ldt_selector));
135 table_base = segment_base(ldt_selector);
136 }
137 d = (struct segment_descriptor *)(table_base + (selector & ~7));
138 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
139 #ifdef CONFIG_X86_64
140 if (d->system == 0
141 && (d->type == 2 || d->type == 9 || d->type == 11))
142 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
143 #endif
144 return v;
145 }
146 EXPORT_SYMBOL_GPL(segment_base);
147
148 static inline int valid_vcpu(int n)
149 {
150 return likely(n >= 0 && n < KVM_MAX_VCPUS);
151 }
152
153 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
154 {
155 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
156 return;
157
158 vcpu->guest_fpu_loaded = 1;
159 fx_save(&vcpu->host_fx_image);
160 fx_restore(&vcpu->guest_fx_image);
161 }
162 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
163
164 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
165 {
166 if (!vcpu->guest_fpu_loaded)
167 return;
168
169 vcpu->guest_fpu_loaded = 0;
170 fx_save(&vcpu->guest_fx_image);
171 fx_restore(&vcpu->host_fx_image);
172 }
173 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
174
175 /*
176 * Switches to specified vcpu, until a matching vcpu_put()
177 */
178 static void vcpu_load(struct kvm_vcpu *vcpu)
179 {
180 int cpu;
181
182 mutex_lock(&vcpu->mutex);
183 cpu = get_cpu();
184 preempt_notifier_register(&vcpu->preempt_notifier);
185 kvm_arch_ops->vcpu_load(vcpu, cpu);
186 put_cpu();
187 }
188
189 static void vcpu_put(struct kvm_vcpu *vcpu)
190 {
191 preempt_disable();
192 kvm_arch_ops->vcpu_put(vcpu);
193 preempt_notifier_unregister(&vcpu->preempt_notifier);
194 preempt_enable();
195 mutex_unlock(&vcpu->mutex);
196 }
197
198 static void ack_flush(void *_completed)
199 {
200 atomic_t *completed = _completed;
201
202 atomic_inc(completed);
203 }
204
205 void kvm_flush_remote_tlbs(struct kvm *kvm)
206 {
207 int i, cpu, needed;
208 cpumask_t cpus;
209 struct kvm_vcpu *vcpu;
210 atomic_t completed;
211
212 atomic_set(&completed, 0);
213 cpus_clear(cpus);
214 needed = 0;
215 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
216 vcpu = kvm->vcpus[i];
217 if (!vcpu)
218 continue;
219 if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests))
220 continue;
221 cpu = vcpu->cpu;
222 if (cpu != -1 && cpu != raw_smp_processor_id())
223 if (!cpu_isset(cpu, cpus)) {
224 cpu_set(cpu, cpus);
225 ++needed;
226 }
227 }
228
229 /*
230 * We really want smp_call_function_mask() here. But that's not
231 * available, so ipi all cpus in parallel and wait for them
232 * to complete.
233 */
234 for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus))
235 smp_call_function_single(cpu, ack_flush, &completed, 1, 0);
236 while (atomic_read(&completed) != needed) {
237 cpu_relax();
238 barrier();
239 }
240 }
241
242 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
243 {
244 struct page *page;
245 int r;
246
247 mutex_init(&vcpu->mutex);
248 vcpu->cpu = -1;
249 vcpu->mmu.root_hpa = INVALID_PAGE;
250 vcpu->kvm = kvm;
251 vcpu->vcpu_id = id;
252 if (!irqchip_in_kernel(kvm) || id == 0)
253 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
254 else
255 vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
256 init_waitqueue_head(&vcpu->wq);
257
258 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
259 if (!page) {
260 r = -ENOMEM;
261 goto fail;
262 }
263 vcpu->run = page_address(page);
264
265 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
266 if (!page) {
267 r = -ENOMEM;
268 goto fail_free_run;
269 }
270 vcpu->pio_data = page_address(page);
271
272 r = kvm_mmu_create(vcpu);
273 if (r < 0)
274 goto fail_free_pio_data;
275
276 return 0;
277
278 fail_free_pio_data:
279 free_page((unsigned long)vcpu->pio_data);
280 fail_free_run:
281 free_page((unsigned long)vcpu->run);
282 fail:
283 return -ENOMEM;
284 }
285 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
286
287 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
288 {
289 kvm_mmu_destroy(vcpu);
290 if (vcpu->apic)
291 hrtimer_cancel(&vcpu->apic->timer.dev);
292 kvm_free_apic(vcpu->apic);
293 free_page((unsigned long)vcpu->pio_data);
294 free_page((unsigned long)vcpu->run);
295 }
296 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
297
298 static struct kvm *kvm_create_vm(void)
299 {
300 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
301
302 if (!kvm)
303 return ERR_PTR(-ENOMEM);
304
305 kvm_io_bus_init(&kvm->pio_bus);
306 mutex_init(&kvm->lock);
307 INIT_LIST_HEAD(&kvm->active_mmu_pages);
308 kvm_io_bus_init(&kvm->mmio_bus);
309 spin_lock(&kvm_lock);
310 list_add(&kvm->vm_list, &vm_list);
311 spin_unlock(&kvm_lock);
312 return kvm;
313 }
314
315 /*
316 * Free any memory in @free but not in @dont.
317 */
318 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
319 struct kvm_memory_slot *dont)
320 {
321 int i;
322
323 if (!dont || free->phys_mem != dont->phys_mem)
324 if (free->phys_mem) {
325 for (i = 0; i < free->npages; ++i)
326 if (free->phys_mem[i])
327 __free_page(free->phys_mem[i]);
328 vfree(free->phys_mem);
329 }
330
331 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
332 vfree(free->dirty_bitmap);
333
334 free->phys_mem = NULL;
335 free->npages = 0;
336 free->dirty_bitmap = NULL;
337 }
338
339 static void kvm_free_physmem(struct kvm *kvm)
340 {
341 int i;
342
343 for (i = 0; i < kvm->nmemslots; ++i)
344 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
345 }
346
347 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
348 {
349 int i;
350
351 for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
352 if (vcpu->pio.guest_pages[i]) {
353 __free_page(vcpu->pio.guest_pages[i]);
354 vcpu->pio.guest_pages[i] = NULL;
355 }
356 }
357
358 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
359 {
360 vcpu_load(vcpu);
361 kvm_mmu_unload(vcpu);
362 vcpu_put(vcpu);
363 }
364
365 static void kvm_free_vcpus(struct kvm *kvm)
366 {
367 unsigned int i;
368
369 /*
370 * Unpin any mmu pages first.
371 */
372 for (i = 0; i < KVM_MAX_VCPUS; ++i)
373 if (kvm->vcpus[i])
374 kvm_unload_vcpu_mmu(kvm->vcpus[i]);
375 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
376 if (kvm->vcpus[i]) {
377 kvm_arch_ops->vcpu_free(kvm->vcpus[i]);
378 kvm->vcpus[i] = NULL;
379 }
380 }
381
382 }
383
384 static void kvm_destroy_vm(struct kvm *kvm)
385 {
386 spin_lock(&kvm_lock);
387 list_del(&kvm->vm_list);
388 spin_unlock(&kvm_lock);
389 kvm_io_bus_destroy(&kvm->pio_bus);
390 kvm_io_bus_destroy(&kvm->mmio_bus);
391 kfree(kvm->vpic);
392 kfree(kvm->vioapic);
393 kvm_free_vcpus(kvm);
394 kvm_free_physmem(kvm);
395 kfree(kvm);
396 }
397
398 static int kvm_vm_release(struct inode *inode, struct file *filp)
399 {
400 struct kvm *kvm = filp->private_data;
401
402 kvm_destroy_vm(kvm);
403 return 0;
404 }
405
406 static void inject_gp(struct kvm_vcpu *vcpu)
407 {
408 kvm_arch_ops->inject_gp(vcpu, 0);
409 }
410
411 /*
412 * Load the pae pdptrs. Return true is they are all valid.
413 */
414 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
415 {
416 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
417 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
418 int i;
419 u64 *pdpt;
420 int ret;
421 struct page *page;
422 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
423
424 mutex_lock(&vcpu->kvm->lock);
425 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
426 if (!page) {
427 ret = 0;
428 goto out;
429 }
430
431 pdpt = kmap_atomic(page, KM_USER0);
432 memcpy(pdpte, pdpt+offset, sizeof(pdpte));
433 kunmap_atomic(pdpt, KM_USER0);
434
435 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
436 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
437 ret = 0;
438 goto out;
439 }
440 }
441 ret = 1;
442
443 memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
444 out:
445 mutex_unlock(&vcpu->kvm->lock);
446
447 return ret;
448 }
449
450 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
451 {
452 if (cr0 & CR0_RESERVED_BITS) {
453 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
454 cr0, vcpu->cr0);
455 inject_gp(vcpu);
456 return;
457 }
458
459 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
460 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
461 inject_gp(vcpu);
462 return;
463 }
464
465 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
466 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
467 "and a clear PE flag\n");
468 inject_gp(vcpu);
469 return;
470 }
471
472 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
473 #ifdef CONFIG_X86_64
474 if ((vcpu->shadow_efer & EFER_LME)) {
475 int cs_db, cs_l;
476
477 if (!is_pae(vcpu)) {
478 printk(KERN_DEBUG "set_cr0: #GP, start paging "
479 "in long mode while PAE is disabled\n");
480 inject_gp(vcpu);
481 return;
482 }
483 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
484 if (cs_l) {
485 printk(KERN_DEBUG "set_cr0: #GP, start paging "
486 "in long mode while CS.L == 1\n");
487 inject_gp(vcpu);
488 return;
489
490 }
491 } else
492 #endif
493 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
494 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
495 "reserved bits\n");
496 inject_gp(vcpu);
497 return;
498 }
499
500 }
501
502 kvm_arch_ops->set_cr0(vcpu, cr0);
503 vcpu->cr0 = cr0;
504
505 mutex_lock(&vcpu->kvm->lock);
506 kvm_mmu_reset_context(vcpu);
507 mutex_unlock(&vcpu->kvm->lock);
508 return;
509 }
510 EXPORT_SYMBOL_GPL(set_cr0);
511
512 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
513 {
514 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
515 }
516 EXPORT_SYMBOL_GPL(lmsw);
517
518 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
519 {
520 if (cr4 & CR4_RESERVED_BITS) {
521 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
522 inject_gp(vcpu);
523 return;
524 }
525
526 if (is_long_mode(vcpu)) {
527 if (!(cr4 & X86_CR4_PAE)) {
528 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
529 "in long mode\n");
530 inject_gp(vcpu);
531 return;
532 }
533 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
534 && !load_pdptrs(vcpu, vcpu->cr3)) {
535 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
536 inject_gp(vcpu);
537 return;
538 }
539
540 if (cr4 & X86_CR4_VMXE) {
541 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
542 inject_gp(vcpu);
543 return;
544 }
545 kvm_arch_ops->set_cr4(vcpu, cr4);
546 vcpu->cr4 = cr4;
547 mutex_lock(&vcpu->kvm->lock);
548 kvm_mmu_reset_context(vcpu);
549 mutex_unlock(&vcpu->kvm->lock);
550 }
551 EXPORT_SYMBOL_GPL(set_cr4);
552
553 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
554 {
555 if (is_long_mode(vcpu)) {
556 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
557 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
558 inject_gp(vcpu);
559 return;
560 }
561 } else {
562 if (is_pae(vcpu)) {
563 if (cr3 & CR3_PAE_RESERVED_BITS) {
564 printk(KERN_DEBUG
565 "set_cr3: #GP, reserved bits\n");
566 inject_gp(vcpu);
567 return;
568 }
569 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
570 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
571 "reserved bits\n");
572 inject_gp(vcpu);
573 return;
574 }
575 } else {
576 if (cr3 & CR3_NONPAE_RESERVED_BITS) {
577 printk(KERN_DEBUG
578 "set_cr3: #GP, reserved bits\n");
579 inject_gp(vcpu);
580 return;
581 }
582 }
583 }
584
585 mutex_lock(&vcpu->kvm->lock);
586 /*
587 * Does the new cr3 value map to physical memory? (Note, we
588 * catch an invalid cr3 even in real-mode, because it would
589 * cause trouble later on when we turn on paging anyway.)
590 *
591 * A real CPU would silently accept an invalid cr3 and would
592 * attempt to use it - with largely undefined (and often hard
593 * to debug) behavior on the guest side.
594 */
595 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
596 inject_gp(vcpu);
597 else {
598 vcpu->cr3 = cr3;
599 vcpu->mmu.new_cr3(vcpu);
600 }
601 mutex_unlock(&vcpu->kvm->lock);
602 }
603 EXPORT_SYMBOL_GPL(set_cr3);
604
605 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
606 {
607 if (cr8 & CR8_RESERVED_BITS) {
608 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
609 inject_gp(vcpu);
610 return;
611 }
612 if (irqchip_in_kernel(vcpu->kvm))
613 kvm_lapic_set_tpr(vcpu, cr8);
614 else
615 vcpu->cr8 = cr8;
616 }
617 EXPORT_SYMBOL_GPL(set_cr8);
618
619 unsigned long get_cr8(struct kvm_vcpu *vcpu)
620 {
621 if (irqchip_in_kernel(vcpu->kvm))
622 return kvm_lapic_get_cr8(vcpu);
623 else
624 return vcpu->cr8;
625 }
626 EXPORT_SYMBOL_GPL(get_cr8);
627
628 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
629 {
630 if (irqchip_in_kernel(vcpu->kvm))
631 return vcpu->apic_base;
632 else
633 return vcpu->apic_base;
634 }
635 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
636
637 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
638 {
639 /* TODO: reserve bits check */
640 if (irqchip_in_kernel(vcpu->kvm))
641 kvm_lapic_set_base(vcpu, data);
642 else
643 vcpu->apic_base = data;
644 }
645 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
646
647 void fx_init(struct kvm_vcpu *vcpu)
648 {
649 unsigned after_mxcsr_mask;
650
651 /* Initialize guest FPU by resetting ours and saving into guest's */
652 preempt_disable();
653 fx_save(&vcpu->host_fx_image);
654 fpu_init();
655 fx_save(&vcpu->guest_fx_image);
656 fx_restore(&vcpu->host_fx_image);
657 preempt_enable();
658
659 vcpu->cr0 |= X86_CR0_ET;
660 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
661 vcpu->guest_fx_image.mxcsr = 0x1f80;
662 memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
663 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
664 }
665 EXPORT_SYMBOL_GPL(fx_init);
666
667 /*
668 * Allocate some memory and give it an address in the guest physical address
669 * space.
670 *
671 * Discontiguous memory is allowed, mostly for framebuffers.
672 */
673 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
674 struct kvm_memory_region *mem)
675 {
676 int r;
677 gfn_t base_gfn;
678 unsigned long npages;
679 unsigned long i;
680 struct kvm_memory_slot *memslot;
681 struct kvm_memory_slot old, new;
682 int memory_config_version;
683
684 r = -EINVAL;
685 /* General sanity checks */
686 if (mem->memory_size & (PAGE_SIZE - 1))
687 goto out;
688 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
689 goto out;
690 if (mem->slot >= KVM_MEMORY_SLOTS)
691 goto out;
692 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
693 goto out;
694
695 memslot = &kvm->memslots[mem->slot];
696 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
697 npages = mem->memory_size >> PAGE_SHIFT;
698
699 if (!npages)
700 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
701
702 raced:
703 mutex_lock(&kvm->lock);
704
705 memory_config_version = kvm->memory_config_version;
706 new = old = *memslot;
707
708 new.base_gfn = base_gfn;
709 new.npages = npages;
710 new.flags = mem->flags;
711
712 /* Disallow changing a memory slot's size. */
713 r = -EINVAL;
714 if (npages && old.npages && npages != old.npages)
715 goto out_unlock;
716
717 /* Check for overlaps */
718 r = -EEXIST;
719 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
720 struct kvm_memory_slot *s = &kvm->memslots[i];
721
722 if (s == memslot)
723 continue;
724 if (!((base_gfn + npages <= s->base_gfn) ||
725 (base_gfn >= s->base_gfn + s->npages)))
726 goto out_unlock;
727 }
728 /*
729 * Do memory allocations outside lock. memory_config_version will
730 * detect any races.
731 */
732 mutex_unlock(&kvm->lock);
733
734 /* Deallocate if slot is being removed */
735 if (!npages)
736 new.phys_mem = NULL;
737
738 /* Free page dirty bitmap if unneeded */
739 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
740 new.dirty_bitmap = NULL;
741
742 r = -ENOMEM;
743
744 /* Allocate if a slot is being created */
745 if (npages && !new.phys_mem) {
746 new.phys_mem = vmalloc(npages * sizeof(struct page *));
747
748 if (!new.phys_mem)
749 goto out_free;
750
751 memset(new.phys_mem, 0, npages * sizeof(struct page *));
752 for (i = 0; i < npages; ++i) {
753 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
754 | __GFP_ZERO);
755 if (!new.phys_mem[i])
756 goto out_free;
757 set_page_private(new.phys_mem[i],0);
758 }
759 }
760
761 /* Allocate page dirty bitmap if needed */
762 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
763 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
764
765 new.dirty_bitmap = vmalloc(dirty_bytes);
766 if (!new.dirty_bitmap)
767 goto out_free;
768 memset(new.dirty_bitmap, 0, dirty_bytes);
769 }
770
771 mutex_lock(&kvm->lock);
772
773 if (memory_config_version != kvm->memory_config_version) {
774 mutex_unlock(&kvm->lock);
775 kvm_free_physmem_slot(&new, &old);
776 goto raced;
777 }
778
779 r = -EAGAIN;
780 if (kvm->busy)
781 goto out_unlock;
782
783 if (mem->slot >= kvm->nmemslots)
784 kvm->nmemslots = mem->slot + 1;
785
786 *memslot = new;
787 ++kvm->memory_config_version;
788
789 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
790 kvm_flush_remote_tlbs(kvm);
791
792 mutex_unlock(&kvm->lock);
793
794 kvm_free_physmem_slot(&old, &new);
795 return 0;
796
797 out_unlock:
798 mutex_unlock(&kvm->lock);
799 out_free:
800 kvm_free_physmem_slot(&new, &old);
801 out:
802 return r;
803 }
804
805 /*
806 * Get (and clear) the dirty memory log for a memory slot.
807 */
808 static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
809 struct kvm_dirty_log *log)
810 {
811 struct kvm_memory_slot *memslot;
812 int r, i;
813 int n;
814 unsigned long any = 0;
815
816 mutex_lock(&kvm->lock);
817
818 /*
819 * Prevent changes to guest memory configuration even while the lock
820 * is not taken.
821 */
822 ++kvm->busy;
823 mutex_unlock(&kvm->lock);
824 r = -EINVAL;
825 if (log->slot >= KVM_MEMORY_SLOTS)
826 goto out;
827
828 memslot = &kvm->memslots[log->slot];
829 r = -ENOENT;
830 if (!memslot->dirty_bitmap)
831 goto out;
832
833 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
834
835 for (i = 0; !any && i < n/sizeof(long); ++i)
836 any = memslot->dirty_bitmap[i];
837
838 r = -EFAULT;
839 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
840 goto out;
841
842 /* If nothing is dirty, don't bother messing with page tables. */
843 if (any) {
844 mutex_lock(&kvm->lock);
845 kvm_mmu_slot_remove_write_access(kvm, log->slot);
846 kvm_flush_remote_tlbs(kvm);
847 memset(memslot->dirty_bitmap, 0, n);
848 mutex_unlock(&kvm->lock);
849 }
850
851 r = 0;
852
853 out:
854 mutex_lock(&kvm->lock);
855 --kvm->busy;
856 mutex_unlock(&kvm->lock);
857 return r;
858 }
859
860 /*
861 * Set a new alias region. Aliases map a portion of physical memory into
862 * another portion. This is useful for memory windows, for example the PC
863 * VGA region.
864 */
865 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
866 struct kvm_memory_alias *alias)
867 {
868 int r, n;
869 struct kvm_mem_alias *p;
870
871 r = -EINVAL;
872 /* General sanity checks */
873 if (alias->memory_size & (PAGE_SIZE - 1))
874 goto out;
875 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
876 goto out;
877 if (alias->slot >= KVM_ALIAS_SLOTS)
878 goto out;
879 if (alias->guest_phys_addr + alias->memory_size
880 < alias->guest_phys_addr)
881 goto out;
882 if (alias->target_phys_addr + alias->memory_size
883 < alias->target_phys_addr)
884 goto out;
885
886 mutex_lock(&kvm->lock);
887
888 p = &kvm->aliases[alias->slot];
889 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
890 p->npages = alias->memory_size >> PAGE_SHIFT;
891 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
892
893 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
894 if (kvm->aliases[n - 1].npages)
895 break;
896 kvm->naliases = n;
897
898 kvm_mmu_zap_all(kvm);
899
900 mutex_unlock(&kvm->lock);
901
902 return 0;
903
904 out:
905 return r;
906 }
907
908 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
909 {
910 int r;
911
912 r = 0;
913 switch (chip->chip_id) {
914 case KVM_IRQCHIP_PIC_MASTER:
915 memcpy (&chip->chip.pic,
916 &pic_irqchip(kvm)->pics[0],
917 sizeof(struct kvm_pic_state));
918 break;
919 case KVM_IRQCHIP_PIC_SLAVE:
920 memcpy (&chip->chip.pic,
921 &pic_irqchip(kvm)->pics[1],
922 sizeof(struct kvm_pic_state));
923 break;
924 case KVM_IRQCHIP_IOAPIC:
925 memcpy (&chip->chip.ioapic,
926 ioapic_irqchip(kvm),
927 sizeof(struct kvm_ioapic_state));
928 break;
929 default:
930 r = -EINVAL;
931 break;
932 }
933 return r;
934 }
935
936 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
937 {
938 int r;
939
940 r = 0;
941 switch (chip->chip_id) {
942 case KVM_IRQCHIP_PIC_MASTER:
943 memcpy (&pic_irqchip(kvm)->pics[0],
944 &chip->chip.pic,
945 sizeof(struct kvm_pic_state));
946 break;
947 case KVM_IRQCHIP_PIC_SLAVE:
948 memcpy (&pic_irqchip(kvm)->pics[1],
949 &chip->chip.pic,
950 sizeof(struct kvm_pic_state));
951 break;
952 case KVM_IRQCHIP_IOAPIC:
953 memcpy (ioapic_irqchip(kvm),
954 &chip->chip.ioapic,
955 sizeof(struct kvm_ioapic_state));
956 break;
957 default:
958 r = -EINVAL;
959 break;
960 }
961 kvm_pic_update_irq(pic_irqchip(kvm));
962 return r;
963 }
964
965 static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
966 {
967 int i;
968 struct kvm_mem_alias *alias;
969
970 for (i = 0; i < kvm->naliases; ++i) {
971 alias = &kvm->aliases[i];
972 if (gfn >= alias->base_gfn
973 && gfn < alias->base_gfn + alias->npages)
974 return alias->target_gfn + gfn - alias->base_gfn;
975 }
976 return gfn;
977 }
978
979 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
980 {
981 int i;
982
983 for (i = 0; i < kvm->nmemslots; ++i) {
984 struct kvm_memory_slot *memslot = &kvm->memslots[i];
985
986 if (gfn >= memslot->base_gfn
987 && gfn < memslot->base_gfn + memslot->npages)
988 return memslot;
989 }
990 return NULL;
991 }
992
993 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
994 {
995 gfn = unalias_gfn(kvm, gfn);
996 return __gfn_to_memslot(kvm, gfn);
997 }
998
999 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1000 {
1001 struct kvm_memory_slot *slot;
1002
1003 gfn = unalias_gfn(kvm, gfn);
1004 slot = __gfn_to_memslot(kvm, gfn);
1005 if (!slot)
1006 return NULL;
1007 return slot->phys_mem[gfn - slot->base_gfn];
1008 }
1009 EXPORT_SYMBOL_GPL(gfn_to_page);
1010
1011 /* WARNING: Does not work on aliased pages. */
1012 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1013 {
1014 struct kvm_memory_slot *memslot;
1015
1016 memslot = __gfn_to_memslot(kvm, gfn);
1017 if (memslot && memslot->dirty_bitmap) {
1018 unsigned long rel_gfn = gfn - memslot->base_gfn;
1019
1020 /* avoid RMW */
1021 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1022 set_bit(rel_gfn, memslot->dirty_bitmap);
1023 }
1024 }
1025
1026 int emulator_read_std(unsigned long addr,
1027 void *val,
1028 unsigned int bytes,
1029 struct kvm_vcpu *vcpu)
1030 {
1031 void *data = val;
1032
1033 while (bytes) {
1034 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1035 unsigned offset = addr & (PAGE_SIZE-1);
1036 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1037 unsigned long pfn;
1038 struct page *page;
1039 void *page_virt;
1040
1041 if (gpa == UNMAPPED_GVA)
1042 return X86EMUL_PROPAGATE_FAULT;
1043 pfn = gpa >> PAGE_SHIFT;
1044 page = gfn_to_page(vcpu->kvm, pfn);
1045 if (!page)
1046 return X86EMUL_UNHANDLEABLE;
1047 page_virt = kmap_atomic(page, KM_USER0);
1048
1049 memcpy(data, page_virt + offset, tocopy);
1050
1051 kunmap_atomic(page_virt, KM_USER0);
1052
1053 bytes -= tocopy;
1054 data += tocopy;
1055 addr += tocopy;
1056 }
1057
1058 return X86EMUL_CONTINUE;
1059 }
1060 EXPORT_SYMBOL_GPL(emulator_read_std);
1061
1062 static int emulator_write_std(unsigned long addr,
1063 const void *val,
1064 unsigned int bytes,
1065 struct kvm_vcpu *vcpu)
1066 {
1067 pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
1068 return X86EMUL_UNHANDLEABLE;
1069 }
1070
1071 /*
1072 * Only apic need an MMIO device hook, so shortcut now..
1073 */
1074 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1075 gpa_t addr)
1076 {
1077 struct kvm_io_device *dev;
1078
1079 if (vcpu->apic) {
1080 dev = &vcpu->apic->dev;
1081 if (dev->in_range(dev, addr))
1082 return dev;
1083 }
1084 return NULL;
1085 }
1086
1087 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1088 gpa_t addr)
1089 {
1090 struct kvm_io_device *dev;
1091
1092 dev = vcpu_find_pervcpu_dev(vcpu, addr);
1093 if (dev == NULL)
1094 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1095 return dev;
1096 }
1097
1098 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1099 gpa_t addr)
1100 {
1101 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1102 }
1103
1104 static int emulator_read_emulated(unsigned long addr,
1105 void *val,
1106 unsigned int bytes,
1107 struct kvm_vcpu *vcpu)
1108 {
1109 struct kvm_io_device *mmio_dev;
1110 gpa_t gpa;
1111
1112 if (vcpu->mmio_read_completed) {
1113 memcpy(val, vcpu->mmio_data, bytes);
1114 vcpu->mmio_read_completed = 0;
1115 return X86EMUL_CONTINUE;
1116 } else if (emulator_read_std(addr, val, bytes, vcpu)
1117 == X86EMUL_CONTINUE)
1118 return X86EMUL_CONTINUE;
1119
1120 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1121 if (gpa == UNMAPPED_GVA)
1122 return X86EMUL_PROPAGATE_FAULT;
1123
1124 /*
1125 * Is this MMIO handled locally?
1126 */
1127 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1128 if (mmio_dev) {
1129 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1130 return X86EMUL_CONTINUE;
1131 }
1132
1133 vcpu->mmio_needed = 1;
1134 vcpu->mmio_phys_addr = gpa;
1135 vcpu->mmio_size = bytes;
1136 vcpu->mmio_is_write = 0;
1137
1138 return X86EMUL_UNHANDLEABLE;
1139 }
1140
1141 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1142 const void *val, int bytes)
1143 {
1144 struct page *page;
1145 void *virt;
1146
1147 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1148 return 0;
1149 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1150 if (!page)
1151 return 0;
1152 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
1153 virt = kmap_atomic(page, KM_USER0);
1154 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1155 memcpy(virt + offset_in_page(gpa), val, bytes);
1156 kunmap_atomic(virt, KM_USER0);
1157 return 1;
1158 }
1159
1160 static int emulator_write_emulated_onepage(unsigned long addr,
1161 const void *val,
1162 unsigned int bytes,
1163 struct kvm_vcpu *vcpu)
1164 {
1165 struct kvm_io_device *mmio_dev;
1166 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1167
1168 if (gpa == UNMAPPED_GVA) {
1169 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
1170 return X86EMUL_PROPAGATE_FAULT;
1171 }
1172
1173 if (emulator_write_phys(vcpu, gpa, val, bytes))
1174 return X86EMUL_CONTINUE;
1175
1176 /*
1177 * Is this MMIO handled locally?
1178 */
1179 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1180 if (mmio_dev) {
1181 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1182 return X86EMUL_CONTINUE;
1183 }
1184
1185 vcpu->mmio_needed = 1;
1186 vcpu->mmio_phys_addr = gpa;
1187 vcpu->mmio_size = bytes;
1188 vcpu->mmio_is_write = 1;
1189 memcpy(vcpu->mmio_data, val, bytes);
1190
1191 return X86EMUL_CONTINUE;
1192 }
1193
1194 int emulator_write_emulated(unsigned long addr,
1195 const void *val,
1196 unsigned int bytes,
1197 struct kvm_vcpu *vcpu)
1198 {
1199 /* Crossing a page boundary? */
1200 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1201 int rc, now;
1202
1203 now = -addr & ~PAGE_MASK;
1204 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1205 if (rc != X86EMUL_CONTINUE)
1206 return rc;
1207 addr += now;
1208 val += now;
1209 bytes -= now;
1210 }
1211 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1212 }
1213 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1214
1215 static int emulator_cmpxchg_emulated(unsigned long addr,
1216 const void *old,
1217 const void *new,
1218 unsigned int bytes,
1219 struct kvm_vcpu *vcpu)
1220 {
1221 static int reported;
1222
1223 if (!reported) {
1224 reported = 1;
1225 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1226 }
1227 return emulator_write_emulated(addr, new, bytes, vcpu);
1228 }
1229
1230 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1231 {
1232 return kvm_arch_ops->get_segment_base(vcpu, seg);
1233 }
1234
1235 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1236 {
1237 return X86EMUL_CONTINUE;
1238 }
1239
1240 int emulate_clts(struct kvm_vcpu *vcpu)
1241 {
1242 vcpu->cr0 &= ~X86_CR0_TS;
1243 kvm_arch_ops->set_cr0(vcpu, vcpu->cr0);
1244 return X86EMUL_CONTINUE;
1245 }
1246
1247 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1248 {
1249 struct kvm_vcpu *vcpu = ctxt->vcpu;
1250
1251 switch (dr) {
1252 case 0 ... 3:
1253 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1254 return X86EMUL_CONTINUE;
1255 default:
1256 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1257 return X86EMUL_UNHANDLEABLE;
1258 }
1259 }
1260
1261 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1262 {
1263 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1264 int exception;
1265
1266 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1267 if (exception) {
1268 /* FIXME: better handling */
1269 return X86EMUL_UNHANDLEABLE;
1270 }
1271 return X86EMUL_CONTINUE;
1272 }
1273
1274 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1275 {
1276 static int reported;
1277 u8 opcodes[4];
1278 unsigned long rip = ctxt->vcpu->rip;
1279 unsigned long rip_linear;
1280
1281 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1282
1283 if (reported)
1284 return;
1285
1286 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt->vcpu);
1287
1288 printk(KERN_ERR "emulation failed but !mmio_needed?"
1289 " rip %lx %02x %02x %02x %02x\n",
1290 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1291 reported = 1;
1292 }
1293
1294 struct x86_emulate_ops emulate_ops = {
1295 .read_std = emulator_read_std,
1296 .write_std = emulator_write_std,
1297 .read_emulated = emulator_read_emulated,
1298 .write_emulated = emulator_write_emulated,
1299 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1300 };
1301
1302 int emulate_instruction(struct kvm_vcpu *vcpu,
1303 struct kvm_run *run,
1304 unsigned long cr2,
1305 u16 error_code)
1306 {
1307 struct x86_emulate_ctxt emulate_ctxt;
1308 int r;
1309 int cs_db, cs_l;
1310
1311 vcpu->mmio_fault_cr2 = cr2;
1312 kvm_arch_ops->cache_regs(vcpu);
1313
1314 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1315
1316 emulate_ctxt.vcpu = vcpu;
1317 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1318 emulate_ctxt.cr2 = cr2;
1319 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1320 ? X86EMUL_MODE_REAL : cs_l
1321 ? X86EMUL_MODE_PROT64 : cs_db
1322 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1323
1324 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1325 emulate_ctxt.cs_base = 0;
1326 emulate_ctxt.ds_base = 0;
1327 emulate_ctxt.es_base = 0;
1328 emulate_ctxt.ss_base = 0;
1329 } else {
1330 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1331 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1332 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1333 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1334 }
1335
1336 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1337 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1338
1339 vcpu->mmio_is_write = 0;
1340 vcpu->pio.string = 0;
1341 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1342 if (vcpu->pio.string)
1343 return EMULATE_DO_MMIO;
1344
1345 if ((r || vcpu->mmio_is_write) && run) {
1346 run->exit_reason = KVM_EXIT_MMIO;
1347 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1348 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1349 run->mmio.len = vcpu->mmio_size;
1350 run->mmio.is_write = vcpu->mmio_is_write;
1351 }
1352
1353 if (r) {
1354 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1355 return EMULATE_DONE;
1356 if (!vcpu->mmio_needed) {
1357 report_emulation_failure(&emulate_ctxt);
1358 return EMULATE_FAIL;
1359 }
1360 return EMULATE_DO_MMIO;
1361 }
1362
1363 kvm_arch_ops->decache_regs(vcpu);
1364 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1365
1366 if (vcpu->mmio_is_write) {
1367 vcpu->mmio_needed = 0;
1368 return EMULATE_DO_MMIO;
1369 }
1370
1371 return EMULATE_DONE;
1372 }
1373 EXPORT_SYMBOL_GPL(emulate_instruction);
1374
1375 /*
1376 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1377 */
1378 static void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1379 {
1380 DECLARE_WAITQUEUE(wait, current);
1381
1382 add_wait_queue(&vcpu->wq, &wait);
1383
1384 /*
1385 * We will block until either an interrupt or a signal wakes us up
1386 */
1387 while (!kvm_cpu_has_interrupt(vcpu)
1388 && !signal_pending(current)
1389 && vcpu->mp_state != VCPU_MP_STATE_RUNNABLE
1390 && vcpu->mp_state != VCPU_MP_STATE_SIPI_RECEIVED) {
1391 set_current_state(TASK_INTERRUPTIBLE);
1392 vcpu_put(vcpu);
1393 schedule();
1394 vcpu_load(vcpu);
1395 }
1396
1397 __set_current_state(TASK_RUNNING);
1398 remove_wait_queue(&vcpu->wq, &wait);
1399 }
1400
1401 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1402 {
1403 ++vcpu->stat.halt_exits;
1404 if (irqchip_in_kernel(vcpu->kvm)) {
1405 vcpu->mp_state = VCPU_MP_STATE_HALTED;
1406 kvm_vcpu_block(vcpu);
1407 if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE)
1408 return -EINTR;
1409 return 1;
1410 } else {
1411 vcpu->run->exit_reason = KVM_EXIT_HLT;
1412 return 0;
1413 }
1414 }
1415 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1416
1417 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1418 {
1419 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1420
1421 kvm_arch_ops->cache_regs(vcpu);
1422 ret = -KVM_EINVAL;
1423 #ifdef CONFIG_X86_64
1424 if (is_long_mode(vcpu)) {
1425 nr = vcpu->regs[VCPU_REGS_RAX];
1426 a0 = vcpu->regs[VCPU_REGS_RDI];
1427 a1 = vcpu->regs[VCPU_REGS_RSI];
1428 a2 = vcpu->regs[VCPU_REGS_RDX];
1429 a3 = vcpu->regs[VCPU_REGS_RCX];
1430 a4 = vcpu->regs[VCPU_REGS_R8];
1431 a5 = vcpu->regs[VCPU_REGS_R9];
1432 } else
1433 #endif
1434 {
1435 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1436 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1437 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1438 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1439 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1440 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1441 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1442 }
1443 switch (nr) {
1444 default:
1445 run->hypercall.nr = nr;
1446 run->hypercall.args[0] = a0;
1447 run->hypercall.args[1] = a1;
1448 run->hypercall.args[2] = a2;
1449 run->hypercall.args[3] = a3;
1450 run->hypercall.args[4] = a4;
1451 run->hypercall.args[5] = a5;
1452 run->hypercall.ret = ret;
1453 run->hypercall.longmode = is_long_mode(vcpu);
1454 kvm_arch_ops->decache_regs(vcpu);
1455 return 0;
1456 }
1457 vcpu->regs[VCPU_REGS_RAX] = ret;
1458 kvm_arch_ops->decache_regs(vcpu);
1459 return 1;
1460 }
1461 EXPORT_SYMBOL_GPL(kvm_hypercall);
1462
1463 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1464 {
1465 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1466 }
1467
1468 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1469 {
1470 struct descriptor_table dt = { limit, base };
1471
1472 kvm_arch_ops->set_gdt(vcpu, &dt);
1473 }
1474
1475 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1476 {
1477 struct descriptor_table dt = { limit, base };
1478
1479 kvm_arch_ops->set_idt(vcpu, &dt);
1480 }
1481
1482 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1483 unsigned long *rflags)
1484 {
1485 lmsw(vcpu, msw);
1486 *rflags = kvm_arch_ops->get_rflags(vcpu);
1487 }
1488
1489 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1490 {
1491 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
1492 switch (cr) {
1493 case 0:
1494 return vcpu->cr0;
1495 case 2:
1496 return vcpu->cr2;
1497 case 3:
1498 return vcpu->cr3;
1499 case 4:
1500 return vcpu->cr4;
1501 default:
1502 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1503 return 0;
1504 }
1505 }
1506
1507 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1508 unsigned long *rflags)
1509 {
1510 switch (cr) {
1511 case 0:
1512 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1513 *rflags = kvm_arch_ops->get_rflags(vcpu);
1514 break;
1515 case 2:
1516 vcpu->cr2 = val;
1517 break;
1518 case 3:
1519 set_cr3(vcpu, val);
1520 break;
1521 case 4:
1522 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1523 break;
1524 default:
1525 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1526 }
1527 }
1528
1529 /*
1530 * Register the para guest with the host:
1531 */
1532 static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1533 {
1534 struct kvm_vcpu_para_state *para_state;
1535 hpa_t para_state_hpa, hypercall_hpa;
1536 struct page *para_state_page;
1537 unsigned char *hypercall;
1538 gpa_t hypercall_gpa;
1539
1540 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1541 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1542
1543 /*
1544 * Needs to be page aligned:
1545 */
1546 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1547 goto err_gp;
1548
1549 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1550 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1551 if (is_error_hpa(para_state_hpa))
1552 goto err_gp;
1553
1554 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
1555 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1556 para_state = kmap(para_state_page);
1557
1558 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1559 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1560
1561 para_state->host_version = KVM_PARA_API_VERSION;
1562 /*
1563 * We cannot support guests that try to register themselves
1564 * with a newer API version than the host supports:
1565 */
1566 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1567 para_state->ret = -KVM_EINVAL;
1568 goto err_kunmap_skip;
1569 }
1570
1571 hypercall_gpa = para_state->hypercall_gpa;
1572 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1573 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1574 if (is_error_hpa(hypercall_hpa)) {
1575 para_state->ret = -KVM_EINVAL;
1576 goto err_kunmap_skip;
1577 }
1578
1579 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1580 vcpu->para_state_page = para_state_page;
1581 vcpu->para_state_gpa = para_state_gpa;
1582 vcpu->hypercall_gpa = hypercall_gpa;
1583
1584 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
1585 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1586 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1587 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1588 kunmap_atomic(hypercall, KM_USER1);
1589
1590 para_state->ret = 0;
1591 err_kunmap_skip:
1592 kunmap(para_state_page);
1593 return 0;
1594 err_gp:
1595 return 1;
1596 }
1597
1598 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1599 {
1600 u64 data;
1601
1602 switch (msr) {
1603 case 0xc0010010: /* SYSCFG */
1604 case 0xc0010015: /* HWCR */
1605 case MSR_IA32_PLATFORM_ID:
1606 case MSR_IA32_P5_MC_ADDR:
1607 case MSR_IA32_P5_MC_TYPE:
1608 case MSR_IA32_MC0_CTL:
1609 case MSR_IA32_MCG_STATUS:
1610 case MSR_IA32_MCG_CAP:
1611 case MSR_IA32_MC0_MISC:
1612 case MSR_IA32_MC0_MISC+4:
1613 case MSR_IA32_MC0_MISC+8:
1614 case MSR_IA32_MC0_MISC+12:
1615 case MSR_IA32_MC0_MISC+16:
1616 case MSR_IA32_UCODE_REV:
1617 case MSR_IA32_PERF_STATUS:
1618 case MSR_IA32_EBL_CR_POWERON:
1619 /* MTRR registers */
1620 case 0xfe:
1621 case 0x200 ... 0x2ff:
1622 data = 0;
1623 break;
1624 case 0xcd: /* fsb frequency */
1625 data = 3;
1626 break;
1627 case MSR_IA32_APICBASE:
1628 data = kvm_get_apic_base(vcpu);
1629 break;
1630 case MSR_IA32_MISC_ENABLE:
1631 data = vcpu->ia32_misc_enable_msr;
1632 break;
1633 #ifdef CONFIG_X86_64
1634 case MSR_EFER:
1635 data = vcpu->shadow_efer;
1636 break;
1637 #endif
1638 default:
1639 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1640 return 1;
1641 }
1642 *pdata = data;
1643 return 0;
1644 }
1645 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1646
1647 /*
1648 * Reads an msr value (of 'msr_index') into 'pdata'.
1649 * Returns 0 on success, non-0 otherwise.
1650 * Assumes vcpu_load() was already called.
1651 */
1652 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1653 {
1654 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1655 }
1656
1657 #ifdef CONFIG_X86_64
1658
1659 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1660 {
1661 if (efer & EFER_RESERVED_BITS) {
1662 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1663 efer);
1664 inject_gp(vcpu);
1665 return;
1666 }
1667
1668 if (is_paging(vcpu)
1669 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1670 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1671 inject_gp(vcpu);
1672 return;
1673 }
1674
1675 kvm_arch_ops->set_efer(vcpu, efer);
1676
1677 efer &= ~EFER_LMA;
1678 efer |= vcpu->shadow_efer & EFER_LMA;
1679
1680 vcpu->shadow_efer = efer;
1681 }
1682
1683 #endif
1684
1685 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1686 {
1687 switch (msr) {
1688 #ifdef CONFIG_X86_64
1689 case MSR_EFER:
1690 set_efer(vcpu, data);
1691 break;
1692 #endif
1693 case MSR_IA32_MC0_STATUS:
1694 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1695 __FUNCTION__, data);
1696 break;
1697 case MSR_IA32_MCG_STATUS:
1698 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1699 __FUNCTION__, data);
1700 break;
1701 case MSR_IA32_UCODE_REV:
1702 case MSR_IA32_UCODE_WRITE:
1703 case 0x200 ... 0x2ff: /* MTRRs */
1704 break;
1705 case MSR_IA32_APICBASE:
1706 kvm_set_apic_base(vcpu, data);
1707 break;
1708 case MSR_IA32_MISC_ENABLE:
1709 vcpu->ia32_misc_enable_msr = data;
1710 break;
1711 /*
1712 * This is the 'probe whether the host is KVM' logic:
1713 */
1714 case MSR_KVM_API_MAGIC:
1715 return vcpu_register_para(vcpu, data);
1716
1717 default:
1718 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
1719 return 1;
1720 }
1721 return 0;
1722 }
1723 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1724
1725 /*
1726 * Writes msr value into into the appropriate "register".
1727 * Returns 0 on success, non-0 otherwise.
1728 * Assumes vcpu_load() was already called.
1729 */
1730 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1731 {
1732 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1733 }
1734
1735 void kvm_resched(struct kvm_vcpu *vcpu)
1736 {
1737 if (!need_resched())
1738 return;
1739 cond_resched();
1740 }
1741 EXPORT_SYMBOL_GPL(kvm_resched);
1742
1743 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1744 {
1745 int i;
1746 u32 function;
1747 struct kvm_cpuid_entry *e, *best;
1748
1749 kvm_arch_ops->cache_regs(vcpu);
1750 function = vcpu->regs[VCPU_REGS_RAX];
1751 vcpu->regs[VCPU_REGS_RAX] = 0;
1752 vcpu->regs[VCPU_REGS_RBX] = 0;
1753 vcpu->regs[VCPU_REGS_RCX] = 0;
1754 vcpu->regs[VCPU_REGS_RDX] = 0;
1755 best = NULL;
1756 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1757 e = &vcpu->cpuid_entries[i];
1758 if (e->function == function) {
1759 best = e;
1760 break;
1761 }
1762 /*
1763 * Both basic or both extended?
1764 */
1765 if (((e->function ^ function) & 0x80000000) == 0)
1766 if (!best || e->function > best->function)
1767 best = e;
1768 }
1769 if (best) {
1770 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1771 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1772 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1773 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1774 }
1775 kvm_arch_ops->decache_regs(vcpu);
1776 kvm_arch_ops->skip_emulated_instruction(vcpu);
1777 }
1778 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1779
1780 static int pio_copy_data(struct kvm_vcpu *vcpu)
1781 {
1782 void *p = vcpu->pio_data;
1783 void *q;
1784 unsigned bytes;
1785 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1786
1787 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1788 PAGE_KERNEL);
1789 if (!q) {
1790 free_pio_guest_pages(vcpu);
1791 return -ENOMEM;
1792 }
1793 q += vcpu->pio.guest_page_offset;
1794 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1795 if (vcpu->pio.in)
1796 memcpy(q, p, bytes);
1797 else
1798 memcpy(p, q, bytes);
1799 q -= vcpu->pio.guest_page_offset;
1800 vunmap(q);
1801 free_pio_guest_pages(vcpu);
1802 return 0;
1803 }
1804
1805 static int complete_pio(struct kvm_vcpu *vcpu)
1806 {
1807 struct kvm_pio_request *io = &vcpu->pio;
1808 long delta;
1809 int r;
1810
1811 kvm_arch_ops->cache_regs(vcpu);
1812
1813 if (!io->string) {
1814 if (io->in)
1815 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1816 io->size);
1817 } else {
1818 if (io->in) {
1819 r = pio_copy_data(vcpu);
1820 if (r) {
1821 kvm_arch_ops->cache_regs(vcpu);
1822 return r;
1823 }
1824 }
1825
1826 delta = 1;
1827 if (io->rep) {
1828 delta *= io->cur_count;
1829 /*
1830 * The size of the register should really depend on
1831 * current address size.
1832 */
1833 vcpu->regs[VCPU_REGS_RCX] -= delta;
1834 }
1835 if (io->down)
1836 delta = -delta;
1837 delta *= io->size;
1838 if (io->in)
1839 vcpu->regs[VCPU_REGS_RDI] += delta;
1840 else
1841 vcpu->regs[VCPU_REGS_RSI] += delta;
1842 }
1843
1844 kvm_arch_ops->decache_regs(vcpu);
1845
1846 io->count -= io->cur_count;
1847 io->cur_count = 0;
1848
1849 if (!io->count)
1850 kvm_arch_ops->skip_emulated_instruction(vcpu);
1851 return 0;
1852 }
1853
1854 static void kernel_pio(struct kvm_io_device *pio_dev,
1855 struct kvm_vcpu *vcpu,
1856 void *pd)
1857 {
1858 /* TODO: String I/O for in kernel device */
1859
1860 mutex_lock(&vcpu->kvm->lock);
1861 if (vcpu->pio.in)
1862 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1863 vcpu->pio.size,
1864 pd);
1865 else
1866 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1867 vcpu->pio.size,
1868 pd);
1869 mutex_unlock(&vcpu->kvm->lock);
1870 }
1871
1872 static void pio_string_write(struct kvm_io_device *pio_dev,
1873 struct kvm_vcpu *vcpu)
1874 {
1875 struct kvm_pio_request *io = &vcpu->pio;
1876 void *pd = vcpu->pio_data;
1877 int i;
1878
1879 mutex_lock(&vcpu->kvm->lock);
1880 for (i = 0; i < io->cur_count; i++) {
1881 kvm_iodevice_write(pio_dev, io->port,
1882 io->size,
1883 pd);
1884 pd += io->size;
1885 }
1886 mutex_unlock(&vcpu->kvm->lock);
1887 }
1888
1889 int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1890 int size, unsigned port)
1891 {
1892 struct kvm_io_device *pio_dev;
1893
1894 vcpu->run->exit_reason = KVM_EXIT_IO;
1895 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1896 vcpu->run->io.size = vcpu->pio.size = size;
1897 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1898 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
1899 vcpu->run->io.port = vcpu->pio.port = port;
1900 vcpu->pio.in = in;
1901 vcpu->pio.string = 0;
1902 vcpu->pio.down = 0;
1903 vcpu->pio.guest_page_offset = 0;
1904 vcpu->pio.rep = 0;
1905
1906 kvm_arch_ops->cache_regs(vcpu);
1907 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1908 kvm_arch_ops->decache_regs(vcpu);
1909
1910 pio_dev = vcpu_find_pio_dev(vcpu, port);
1911 if (pio_dev) {
1912 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1913 complete_pio(vcpu);
1914 return 1;
1915 }
1916 return 0;
1917 }
1918 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
1919
1920 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1921 int size, unsigned long count, int down,
1922 gva_t address, int rep, unsigned port)
1923 {
1924 unsigned now, in_page;
1925 int i, ret = 0;
1926 int nr_pages = 1;
1927 struct page *page;
1928 struct kvm_io_device *pio_dev;
1929
1930 vcpu->run->exit_reason = KVM_EXIT_IO;
1931 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1932 vcpu->run->io.size = vcpu->pio.size = size;
1933 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1934 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
1935 vcpu->run->io.port = vcpu->pio.port = port;
1936 vcpu->pio.in = in;
1937 vcpu->pio.string = 1;
1938 vcpu->pio.down = down;
1939 vcpu->pio.guest_page_offset = offset_in_page(address);
1940 vcpu->pio.rep = rep;
1941
1942 if (!count) {
1943 kvm_arch_ops->skip_emulated_instruction(vcpu);
1944 return 1;
1945 }
1946
1947 if (!down)
1948 in_page = PAGE_SIZE - offset_in_page(address);
1949 else
1950 in_page = offset_in_page(address) + size;
1951 now = min(count, (unsigned long)in_page / size);
1952 if (!now) {
1953 /*
1954 * String I/O straddles page boundary. Pin two guest pages
1955 * so that we satisfy atomicity constraints. Do just one
1956 * transaction to avoid complexity.
1957 */
1958 nr_pages = 2;
1959 now = 1;
1960 }
1961 if (down) {
1962 /*
1963 * String I/O in reverse. Yuck. Kill the guest, fix later.
1964 */
1965 pr_unimpl(vcpu, "guest string pio down\n");
1966 inject_gp(vcpu);
1967 return 1;
1968 }
1969 vcpu->run->io.count = now;
1970 vcpu->pio.cur_count = now;
1971
1972 for (i = 0; i < nr_pages; ++i) {
1973 mutex_lock(&vcpu->kvm->lock);
1974 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1975 if (page)
1976 get_page(page);
1977 vcpu->pio.guest_pages[i] = page;
1978 mutex_unlock(&vcpu->kvm->lock);
1979 if (!page) {
1980 inject_gp(vcpu);
1981 free_pio_guest_pages(vcpu);
1982 return 1;
1983 }
1984 }
1985
1986 pio_dev = vcpu_find_pio_dev(vcpu, port);
1987 if (!vcpu->pio.in) {
1988 /* string PIO write */
1989 ret = pio_copy_data(vcpu);
1990 if (ret >= 0 && pio_dev) {
1991 pio_string_write(pio_dev, vcpu);
1992 complete_pio(vcpu);
1993 if (vcpu->pio.count == 0)
1994 ret = 1;
1995 }
1996 } else if (pio_dev)
1997 pr_unimpl(vcpu, "no string pio read support yet, "
1998 "port %x size %d count %ld\n",
1999 port, size, count);
2000
2001 return ret;
2002 }
2003 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
2004
2005 static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2006 {
2007 int r;
2008 sigset_t sigsaved;
2009
2010 vcpu_load(vcpu);
2011
2012 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
2013 kvm_vcpu_block(vcpu);
2014 vcpu_put(vcpu);
2015 return -EAGAIN;
2016 }
2017
2018 if (vcpu->sigset_active)
2019 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2020
2021 /* re-sync apic's tpr */
2022 if (!irqchip_in_kernel(vcpu->kvm))
2023 set_cr8(vcpu, kvm_run->cr8);
2024
2025 if (vcpu->pio.cur_count) {
2026 r = complete_pio(vcpu);
2027 if (r)
2028 goto out;
2029 }
2030
2031 if (vcpu->mmio_needed) {
2032 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2033 vcpu->mmio_read_completed = 1;
2034 vcpu->mmio_needed = 0;
2035 r = emulate_instruction(vcpu, kvm_run,
2036 vcpu->mmio_fault_cr2, 0);
2037 if (r == EMULATE_DO_MMIO) {
2038 /*
2039 * Read-modify-write. Back to userspace.
2040 */
2041 r = 0;
2042 goto out;
2043 }
2044 }
2045
2046 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2047 kvm_arch_ops->cache_regs(vcpu);
2048 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2049 kvm_arch_ops->decache_regs(vcpu);
2050 }
2051
2052 r = kvm_arch_ops->run(vcpu, kvm_run);
2053
2054 out:
2055 if (vcpu->sigset_active)
2056 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2057
2058 vcpu_put(vcpu);
2059 return r;
2060 }
2061
2062 static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
2063 struct kvm_regs *regs)
2064 {
2065 vcpu_load(vcpu);
2066
2067 kvm_arch_ops->cache_regs(vcpu);
2068
2069 regs->rax = vcpu->regs[VCPU_REGS_RAX];
2070 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
2071 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
2072 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
2073 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
2074 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
2075 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
2076 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
2077 #ifdef CONFIG_X86_64
2078 regs->r8 = vcpu->regs[VCPU_REGS_R8];
2079 regs->r9 = vcpu->regs[VCPU_REGS_R9];
2080 regs->r10 = vcpu->regs[VCPU_REGS_R10];
2081 regs->r11 = vcpu->regs[VCPU_REGS_R11];
2082 regs->r12 = vcpu->regs[VCPU_REGS_R12];
2083 regs->r13 = vcpu->regs[VCPU_REGS_R13];
2084 regs->r14 = vcpu->regs[VCPU_REGS_R14];
2085 regs->r15 = vcpu->regs[VCPU_REGS_R15];
2086 #endif
2087
2088 regs->rip = vcpu->rip;
2089 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
2090
2091 /*
2092 * Don't leak debug flags in case they were set for guest debugging
2093 */
2094 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2095 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2096
2097 vcpu_put(vcpu);
2098
2099 return 0;
2100 }
2101
2102 static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
2103 struct kvm_regs *regs)
2104 {
2105 vcpu_load(vcpu);
2106
2107 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2108 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2109 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2110 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2111 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2112 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2113 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2114 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
2115 #ifdef CONFIG_X86_64
2116 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2117 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2118 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2119 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2120 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2121 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2122 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2123 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2124 #endif
2125
2126 vcpu->rip = regs->rip;
2127 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
2128
2129 kvm_arch_ops->decache_regs(vcpu);
2130
2131 vcpu_put(vcpu);
2132
2133 return 0;
2134 }
2135
2136 static void get_segment(struct kvm_vcpu *vcpu,
2137 struct kvm_segment *var, int seg)
2138 {
2139 return kvm_arch_ops->get_segment(vcpu, var, seg);
2140 }
2141
2142 static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2143 struct kvm_sregs *sregs)
2144 {
2145 struct descriptor_table dt;
2146 int pending_vec;
2147
2148 vcpu_load(vcpu);
2149
2150 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2151 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2152 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2153 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2154 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2155 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2156
2157 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2158 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2159
2160 kvm_arch_ops->get_idt(vcpu, &dt);
2161 sregs->idt.limit = dt.limit;
2162 sregs->idt.base = dt.base;
2163 kvm_arch_ops->get_gdt(vcpu, &dt);
2164 sregs->gdt.limit = dt.limit;
2165 sregs->gdt.base = dt.base;
2166
2167 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
2168 sregs->cr0 = vcpu->cr0;
2169 sregs->cr2 = vcpu->cr2;
2170 sregs->cr3 = vcpu->cr3;
2171 sregs->cr4 = vcpu->cr4;
2172 sregs->cr8 = get_cr8(vcpu);
2173 sregs->efer = vcpu->shadow_efer;
2174 sregs->apic_base = kvm_get_apic_base(vcpu);
2175
2176 if (irqchip_in_kernel(vcpu->kvm)) {
2177 memset(sregs->interrupt_bitmap, 0,
2178 sizeof sregs->interrupt_bitmap);
2179 pending_vec = kvm_arch_ops->get_irq(vcpu);
2180 if (pending_vec >= 0)
2181 set_bit(pending_vec, (unsigned long *)sregs->interrupt_bitmap);
2182 } else
2183 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2184 sizeof sregs->interrupt_bitmap);
2185
2186 vcpu_put(vcpu);
2187
2188 return 0;
2189 }
2190
2191 static void set_segment(struct kvm_vcpu *vcpu,
2192 struct kvm_segment *var, int seg)
2193 {
2194 return kvm_arch_ops->set_segment(vcpu, var, seg);
2195 }
2196
2197 static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2198 struct kvm_sregs *sregs)
2199 {
2200 int mmu_reset_needed = 0;
2201 int i, pending_vec, max_bits;
2202 struct descriptor_table dt;
2203
2204 vcpu_load(vcpu);
2205
2206 dt.limit = sregs->idt.limit;
2207 dt.base = sregs->idt.base;
2208 kvm_arch_ops->set_idt(vcpu, &dt);
2209 dt.limit = sregs->gdt.limit;
2210 dt.base = sregs->gdt.base;
2211 kvm_arch_ops->set_gdt(vcpu, &dt);
2212
2213 vcpu->cr2 = sregs->cr2;
2214 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2215 vcpu->cr3 = sregs->cr3;
2216
2217 set_cr8(vcpu, sregs->cr8);
2218
2219 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2220 #ifdef CONFIG_X86_64
2221 kvm_arch_ops->set_efer(vcpu, sregs->efer);
2222 #endif
2223 kvm_set_apic_base(vcpu, sregs->apic_base);
2224
2225 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
2226
2227 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2228 vcpu->cr0 = sregs->cr0;
2229 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
2230
2231 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2232 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
2233 if (!is_long_mode(vcpu) && is_pae(vcpu))
2234 load_pdptrs(vcpu, vcpu->cr3);
2235
2236 if (mmu_reset_needed)
2237 kvm_mmu_reset_context(vcpu);
2238
2239 if (!irqchip_in_kernel(vcpu->kvm)) {
2240 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2241 sizeof vcpu->irq_pending);
2242 vcpu->irq_summary = 0;
2243 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2244 if (vcpu->irq_pending[i])
2245 __set_bit(i, &vcpu->irq_summary);
2246 } else {
2247 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2248 pending_vec = find_first_bit(
2249 (const unsigned long *)sregs->interrupt_bitmap,
2250 max_bits);
2251 /* Only pending external irq is handled here */
2252 if (pending_vec < max_bits) {
2253 kvm_arch_ops->set_irq(vcpu, pending_vec);
2254 printk("Set back pending irq %d\n", pending_vec);
2255 }
2256 }
2257
2258 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2259 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2260 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2261 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2262 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2263 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2264
2265 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2266 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2267
2268 vcpu_put(vcpu);
2269
2270 return 0;
2271 }
2272
2273 /*
2274 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2275 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
2276 *
2277 * This list is modified at module load time to reflect the
2278 * capabilities of the host cpu.
2279 */
2280 static u32 msrs_to_save[] = {
2281 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2282 MSR_K6_STAR,
2283 #ifdef CONFIG_X86_64
2284 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2285 #endif
2286 MSR_IA32_TIME_STAMP_COUNTER,
2287 };
2288
2289 static unsigned num_msrs_to_save;
2290
2291 static u32 emulated_msrs[] = {
2292 MSR_IA32_MISC_ENABLE,
2293 };
2294
2295 static __init void kvm_init_msr_list(void)
2296 {
2297 u32 dummy[2];
2298 unsigned i, j;
2299
2300 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2301 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2302 continue;
2303 if (j < i)
2304 msrs_to_save[j] = msrs_to_save[i];
2305 j++;
2306 }
2307 num_msrs_to_save = j;
2308 }
2309
2310 /*
2311 * Adapt set_msr() to msr_io()'s calling convention
2312 */
2313 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2314 {
2315 return kvm_set_msr(vcpu, index, *data);
2316 }
2317
2318 /*
2319 * Read or write a bunch of msrs. All parameters are kernel addresses.
2320 *
2321 * @return number of msrs set successfully.
2322 */
2323 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2324 struct kvm_msr_entry *entries,
2325 int (*do_msr)(struct kvm_vcpu *vcpu,
2326 unsigned index, u64 *data))
2327 {
2328 int i;
2329
2330 vcpu_load(vcpu);
2331
2332 for (i = 0; i < msrs->nmsrs; ++i)
2333 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2334 break;
2335
2336 vcpu_put(vcpu);
2337
2338 return i;
2339 }
2340
2341 /*
2342 * Read or write a bunch of msrs. Parameters are user addresses.
2343 *
2344 * @return number of msrs set successfully.
2345 */
2346 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2347 int (*do_msr)(struct kvm_vcpu *vcpu,
2348 unsigned index, u64 *data),
2349 int writeback)
2350 {
2351 struct kvm_msrs msrs;
2352 struct kvm_msr_entry *entries;
2353 int r, n;
2354 unsigned size;
2355
2356 r = -EFAULT;
2357 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2358 goto out;
2359
2360 r = -E2BIG;
2361 if (msrs.nmsrs >= MAX_IO_MSRS)
2362 goto out;
2363
2364 r = -ENOMEM;
2365 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2366 entries = vmalloc(size);
2367 if (!entries)
2368 goto out;
2369
2370 r = -EFAULT;
2371 if (copy_from_user(entries, user_msrs->entries, size))
2372 goto out_free;
2373
2374 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2375 if (r < 0)
2376 goto out_free;
2377
2378 r = -EFAULT;
2379 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2380 goto out_free;
2381
2382 r = n;
2383
2384 out_free:
2385 vfree(entries);
2386 out:
2387 return r;
2388 }
2389
2390 /*
2391 * Translate a guest virtual address to a guest physical address.
2392 */
2393 static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2394 struct kvm_translation *tr)
2395 {
2396 unsigned long vaddr = tr->linear_address;
2397 gpa_t gpa;
2398
2399 vcpu_load(vcpu);
2400 mutex_lock(&vcpu->kvm->lock);
2401 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2402 tr->physical_address = gpa;
2403 tr->valid = gpa != UNMAPPED_GVA;
2404 tr->writeable = 1;
2405 tr->usermode = 0;
2406 mutex_unlock(&vcpu->kvm->lock);
2407 vcpu_put(vcpu);
2408
2409 return 0;
2410 }
2411
2412 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2413 struct kvm_interrupt *irq)
2414 {
2415 if (irq->irq < 0 || irq->irq >= 256)
2416 return -EINVAL;
2417 if (irqchip_in_kernel(vcpu->kvm))
2418 return -ENXIO;
2419 vcpu_load(vcpu);
2420
2421 set_bit(irq->irq, vcpu->irq_pending);
2422 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2423
2424 vcpu_put(vcpu);
2425
2426 return 0;
2427 }
2428
2429 static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2430 struct kvm_debug_guest *dbg)
2431 {
2432 int r;
2433
2434 vcpu_load(vcpu);
2435
2436 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2437
2438 vcpu_put(vcpu);
2439
2440 return r;
2441 }
2442
2443 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2444 unsigned long address,
2445 int *type)
2446 {
2447 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2448 unsigned long pgoff;
2449 struct page *page;
2450
2451 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2452 if (pgoff == 0)
2453 page = virt_to_page(vcpu->run);
2454 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2455 page = virt_to_page(vcpu->pio_data);
2456 else
2457 return NOPAGE_SIGBUS;
2458 get_page(page);
2459 if (type != NULL)
2460 *type = VM_FAULT_MINOR;
2461
2462 return page;
2463 }
2464
2465 static struct vm_operations_struct kvm_vcpu_vm_ops = {
2466 .nopage = kvm_vcpu_nopage,
2467 };
2468
2469 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2470 {
2471 vma->vm_ops = &kvm_vcpu_vm_ops;
2472 return 0;
2473 }
2474
2475 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2476 {
2477 struct kvm_vcpu *vcpu = filp->private_data;
2478
2479 fput(vcpu->kvm->filp);
2480 return 0;
2481 }
2482
2483 static struct file_operations kvm_vcpu_fops = {
2484 .release = kvm_vcpu_release,
2485 .unlocked_ioctl = kvm_vcpu_ioctl,
2486 .compat_ioctl = kvm_vcpu_ioctl,
2487 .mmap = kvm_vcpu_mmap,
2488 };
2489
2490 /*
2491 * Allocates an inode for the vcpu.
2492 */
2493 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2494 {
2495 int fd, r;
2496 struct inode *inode;
2497 struct file *file;
2498
2499 r = anon_inode_getfd(&fd, &inode, &file,
2500 "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2501 if (r)
2502 return r;
2503 atomic_inc(&vcpu->kvm->filp->f_count);
2504 return fd;
2505 }
2506
2507 /*
2508 * Creates some virtual cpus. Good luck creating more than one.
2509 */
2510 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2511 {
2512 int r;
2513 struct kvm_vcpu *vcpu;
2514
2515 if (!valid_vcpu(n))
2516 return -EINVAL;
2517
2518 vcpu = kvm_arch_ops->vcpu_create(kvm, n);
2519 if (IS_ERR(vcpu))
2520 return PTR_ERR(vcpu);
2521
2522 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2523
2524 /* We do fxsave: this must be aligned. */
2525 BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2526
2527 vcpu_load(vcpu);
2528 r = kvm_mmu_setup(vcpu);
2529 vcpu_put(vcpu);
2530 if (r < 0)
2531 goto free_vcpu;
2532
2533 mutex_lock(&kvm->lock);
2534 if (kvm->vcpus[n]) {
2535 r = -EEXIST;
2536 mutex_unlock(&kvm->lock);
2537 goto mmu_unload;
2538 }
2539 kvm->vcpus[n] = vcpu;
2540 mutex_unlock(&kvm->lock);
2541
2542 /* Now it's all set up, let userspace reach it */
2543 r = create_vcpu_fd(vcpu);
2544 if (r < 0)
2545 goto unlink;
2546 return r;
2547
2548 unlink:
2549 mutex_lock(&kvm->lock);
2550 kvm->vcpus[n] = NULL;
2551 mutex_unlock(&kvm->lock);
2552
2553 mmu_unload:
2554 vcpu_load(vcpu);
2555 kvm_mmu_unload(vcpu);
2556 vcpu_put(vcpu);
2557
2558 free_vcpu:
2559 kvm_arch_ops->vcpu_free(vcpu);
2560 return r;
2561 }
2562
2563 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2564 {
2565 u64 efer;
2566 int i;
2567 struct kvm_cpuid_entry *e, *entry;
2568
2569 rdmsrl(MSR_EFER, efer);
2570 entry = NULL;
2571 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2572 e = &vcpu->cpuid_entries[i];
2573 if (e->function == 0x80000001) {
2574 entry = e;
2575 break;
2576 }
2577 }
2578 if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
2579 entry->edx &= ~(1 << 20);
2580 printk(KERN_INFO "kvm: guest NX capability removed\n");
2581 }
2582 }
2583
2584 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2585 struct kvm_cpuid *cpuid,
2586 struct kvm_cpuid_entry __user *entries)
2587 {
2588 int r;
2589
2590 r = -E2BIG;
2591 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2592 goto out;
2593 r = -EFAULT;
2594 if (copy_from_user(&vcpu->cpuid_entries, entries,
2595 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2596 goto out;
2597 vcpu->cpuid_nent = cpuid->nent;
2598 cpuid_fix_nx_cap(vcpu);
2599 return 0;
2600
2601 out:
2602 return r;
2603 }
2604
2605 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2606 {
2607 if (sigset) {
2608 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2609 vcpu->sigset_active = 1;
2610 vcpu->sigset = *sigset;
2611 } else
2612 vcpu->sigset_active = 0;
2613 return 0;
2614 }
2615
2616 /*
2617 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2618 * we have asm/x86/processor.h
2619 */
2620 struct fxsave {
2621 u16 cwd;
2622 u16 swd;
2623 u16 twd;
2624 u16 fop;
2625 u64 rip;
2626 u64 rdp;
2627 u32 mxcsr;
2628 u32 mxcsr_mask;
2629 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2630 #ifdef CONFIG_X86_64
2631 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2632 #else
2633 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2634 #endif
2635 };
2636
2637 static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2638 {
2639 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2640
2641 vcpu_load(vcpu);
2642
2643 memcpy(fpu->fpr, fxsave->st_space, 128);
2644 fpu->fcw = fxsave->cwd;
2645 fpu->fsw = fxsave->swd;
2646 fpu->ftwx = fxsave->twd;
2647 fpu->last_opcode = fxsave->fop;
2648 fpu->last_ip = fxsave->rip;
2649 fpu->last_dp = fxsave->rdp;
2650 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2651
2652 vcpu_put(vcpu);
2653
2654 return 0;
2655 }
2656
2657 static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2658 {
2659 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2660
2661 vcpu_load(vcpu);
2662
2663 memcpy(fxsave->st_space, fpu->fpr, 128);
2664 fxsave->cwd = fpu->fcw;
2665 fxsave->swd = fpu->fsw;
2666 fxsave->twd = fpu->ftwx;
2667 fxsave->fop = fpu->last_opcode;
2668 fxsave->rip = fpu->last_ip;
2669 fxsave->rdp = fpu->last_dp;
2670 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2671
2672 vcpu_put(vcpu);
2673
2674 return 0;
2675 }
2676
2677 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2678 struct kvm_lapic_state *s)
2679 {
2680 vcpu_load(vcpu);
2681 memcpy(s->regs, vcpu->apic->regs, sizeof *s);
2682 vcpu_put(vcpu);
2683
2684 return 0;
2685 }
2686
2687 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2688 struct kvm_lapic_state *s)
2689 {
2690 vcpu_load(vcpu);
2691 memcpy(vcpu->apic->regs, s->regs, sizeof *s);
2692 kvm_apic_post_state_restore(vcpu);
2693 vcpu_put(vcpu);
2694
2695 return 0;
2696 }
2697
2698 static long kvm_vcpu_ioctl(struct file *filp,
2699 unsigned int ioctl, unsigned long arg)
2700 {
2701 struct kvm_vcpu *vcpu = filp->private_data;
2702 void __user *argp = (void __user *)arg;
2703 int r = -EINVAL;
2704
2705 switch (ioctl) {
2706 case KVM_RUN:
2707 r = -EINVAL;
2708 if (arg)
2709 goto out;
2710 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
2711 break;
2712 case KVM_GET_REGS: {
2713 struct kvm_regs kvm_regs;
2714
2715 memset(&kvm_regs, 0, sizeof kvm_regs);
2716 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
2717 if (r)
2718 goto out;
2719 r = -EFAULT;
2720 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
2721 goto out;
2722 r = 0;
2723 break;
2724 }
2725 case KVM_SET_REGS: {
2726 struct kvm_regs kvm_regs;
2727
2728 r = -EFAULT;
2729 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
2730 goto out;
2731 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
2732 if (r)
2733 goto out;
2734 r = 0;
2735 break;
2736 }
2737 case KVM_GET_SREGS: {
2738 struct kvm_sregs kvm_sregs;
2739
2740 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2741 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
2742 if (r)
2743 goto out;
2744 r = -EFAULT;
2745 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
2746 goto out;
2747 r = 0;
2748 break;
2749 }
2750 case KVM_SET_SREGS: {
2751 struct kvm_sregs kvm_sregs;
2752
2753 r = -EFAULT;
2754 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
2755 goto out;
2756 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
2757 if (r)
2758 goto out;
2759 r = 0;
2760 break;
2761 }
2762 case KVM_TRANSLATE: {
2763 struct kvm_translation tr;
2764
2765 r = -EFAULT;
2766 if (copy_from_user(&tr, argp, sizeof tr))
2767 goto out;
2768 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
2769 if (r)
2770 goto out;
2771 r = -EFAULT;
2772 if (copy_to_user(argp, &tr, sizeof tr))
2773 goto out;
2774 r = 0;
2775 break;
2776 }
2777 case KVM_INTERRUPT: {
2778 struct kvm_interrupt irq;
2779
2780 r = -EFAULT;
2781 if (copy_from_user(&irq, argp, sizeof irq))
2782 goto out;
2783 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2784 if (r)
2785 goto out;
2786 r = 0;
2787 break;
2788 }
2789 case KVM_DEBUG_GUEST: {
2790 struct kvm_debug_guest dbg;
2791
2792 r = -EFAULT;
2793 if (copy_from_user(&dbg, argp, sizeof dbg))
2794 goto out;
2795 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
2796 if (r)
2797 goto out;
2798 r = 0;
2799 break;
2800 }
2801 case KVM_GET_MSRS:
2802 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2803 break;
2804 case KVM_SET_MSRS:
2805 r = msr_io(vcpu, argp, do_set_msr, 0);
2806 break;
2807 case KVM_SET_CPUID: {
2808 struct kvm_cpuid __user *cpuid_arg = argp;
2809 struct kvm_cpuid cpuid;
2810
2811 r = -EFAULT;
2812 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2813 goto out;
2814 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2815 if (r)
2816 goto out;
2817 break;
2818 }
2819 case KVM_SET_SIGNAL_MASK: {
2820 struct kvm_signal_mask __user *sigmask_arg = argp;
2821 struct kvm_signal_mask kvm_sigmask;
2822 sigset_t sigset, *p;
2823
2824 p = NULL;
2825 if (argp) {
2826 r = -EFAULT;
2827 if (copy_from_user(&kvm_sigmask, argp,
2828 sizeof kvm_sigmask))
2829 goto out;
2830 r = -EINVAL;
2831 if (kvm_sigmask.len != sizeof sigset)
2832 goto out;
2833 r = -EFAULT;
2834 if (copy_from_user(&sigset, sigmask_arg->sigset,
2835 sizeof sigset))
2836 goto out;
2837 p = &sigset;
2838 }
2839 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2840 break;
2841 }
2842 case KVM_GET_FPU: {
2843 struct kvm_fpu fpu;
2844
2845 memset(&fpu, 0, sizeof fpu);
2846 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2847 if (r)
2848 goto out;
2849 r = -EFAULT;
2850 if (copy_to_user(argp, &fpu, sizeof fpu))
2851 goto out;
2852 r = 0;
2853 break;
2854 }
2855 case KVM_SET_FPU: {
2856 struct kvm_fpu fpu;
2857
2858 r = -EFAULT;
2859 if (copy_from_user(&fpu, argp, sizeof fpu))
2860 goto out;
2861 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2862 if (r)
2863 goto out;
2864 r = 0;
2865 break;
2866 }
2867 case KVM_GET_LAPIC: {
2868 struct kvm_lapic_state lapic;
2869
2870 memset(&lapic, 0, sizeof lapic);
2871 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
2872 if (r)
2873 goto out;
2874 r = -EFAULT;
2875 if (copy_to_user(argp, &lapic, sizeof lapic))
2876 goto out;
2877 r = 0;
2878 break;
2879 }
2880 case KVM_SET_LAPIC: {
2881 struct kvm_lapic_state lapic;
2882
2883 r = -EFAULT;
2884 if (copy_from_user(&lapic, argp, sizeof lapic))
2885 goto out;
2886 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
2887 if (r)
2888 goto out;
2889 r = 0;
2890 break;
2891 }
2892 default:
2893 ;
2894 }
2895 out:
2896 return r;
2897 }
2898
2899 static long kvm_vm_ioctl(struct file *filp,
2900 unsigned int ioctl, unsigned long arg)
2901 {
2902 struct kvm *kvm = filp->private_data;
2903 void __user *argp = (void __user *)arg;
2904 int r = -EINVAL;
2905
2906 switch (ioctl) {
2907 case KVM_CREATE_VCPU:
2908 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2909 if (r < 0)
2910 goto out;
2911 break;
2912 case KVM_SET_MEMORY_REGION: {
2913 struct kvm_memory_region kvm_mem;
2914
2915 r = -EFAULT;
2916 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
2917 goto out;
2918 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
2919 if (r)
2920 goto out;
2921 break;
2922 }
2923 case KVM_GET_DIRTY_LOG: {
2924 struct kvm_dirty_log log;
2925
2926 r = -EFAULT;
2927 if (copy_from_user(&log, argp, sizeof log))
2928 goto out;
2929 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2930 if (r)
2931 goto out;
2932 break;
2933 }
2934 case KVM_SET_MEMORY_ALIAS: {
2935 struct kvm_memory_alias alias;
2936
2937 r = -EFAULT;
2938 if (copy_from_user(&alias, argp, sizeof alias))
2939 goto out;
2940 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2941 if (r)
2942 goto out;
2943 break;
2944 }
2945 case KVM_CREATE_IRQCHIP:
2946 r = -ENOMEM;
2947 kvm->vpic = kvm_create_pic(kvm);
2948 if (kvm->vpic) {
2949 r = kvm_ioapic_init(kvm);
2950 if (r) {
2951 kfree(kvm->vpic);
2952 kvm->vpic = NULL;
2953 goto out;
2954 }
2955 }
2956 else
2957 goto out;
2958 break;
2959 case KVM_IRQ_LINE: {
2960 struct kvm_irq_level irq_event;
2961
2962 r = -EFAULT;
2963 if (copy_from_user(&irq_event, argp, sizeof irq_event))
2964 goto out;
2965 if (irqchip_in_kernel(kvm)) {
2966 mutex_lock(&kvm->lock);
2967 if (irq_event.irq < 16)
2968 kvm_pic_set_irq(pic_irqchip(kvm),
2969 irq_event.irq,
2970 irq_event.level);
2971 kvm_ioapic_set_irq(kvm->vioapic,
2972 irq_event.irq,
2973 irq_event.level);
2974 mutex_unlock(&kvm->lock);
2975 r = 0;
2976 }
2977 break;
2978 }
2979 case KVM_GET_IRQCHIP: {
2980 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
2981 struct kvm_irqchip chip;
2982
2983 r = -EFAULT;
2984 if (copy_from_user(&chip, argp, sizeof chip))
2985 goto out;
2986 r = -ENXIO;
2987 if (!irqchip_in_kernel(kvm))
2988 goto out;
2989 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
2990 if (r)
2991 goto out;
2992 r = -EFAULT;
2993 if (copy_to_user(argp, &chip, sizeof chip))
2994 goto out;
2995 r = 0;
2996 break;
2997 }
2998 case KVM_SET_IRQCHIP: {
2999 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3000 struct kvm_irqchip chip;
3001
3002 r = -EFAULT;
3003 if (copy_from_user(&chip, argp, sizeof chip))
3004 goto out;
3005 r = -ENXIO;
3006 if (!irqchip_in_kernel(kvm))
3007 goto out;
3008 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
3009 if (r)
3010 goto out;
3011 r = 0;
3012 break;
3013 }
3014 default:
3015 ;
3016 }
3017 out:
3018 return r;
3019 }
3020
3021 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
3022 unsigned long address,
3023 int *type)
3024 {
3025 struct kvm *kvm = vma->vm_file->private_data;
3026 unsigned long pgoff;
3027 struct page *page;
3028
3029 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
3030 page = gfn_to_page(kvm, pgoff);
3031 if (!page)
3032 return NOPAGE_SIGBUS;
3033 get_page(page);
3034 if (type != NULL)
3035 *type = VM_FAULT_MINOR;
3036
3037 return page;
3038 }
3039
3040 static struct vm_operations_struct kvm_vm_vm_ops = {
3041 .nopage = kvm_vm_nopage,
3042 };
3043
3044 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
3045 {
3046 vma->vm_ops = &kvm_vm_vm_ops;
3047 return 0;
3048 }
3049
3050 static struct file_operations kvm_vm_fops = {
3051 .release = kvm_vm_release,
3052 .unlocked_ioctl = kvm_vm_ioctl,
3053 .compat_ioctl = kvm_vm_ioctl,
3054 .mmap = kvm_vm_mmap,
3055 };
3056
3057 static int kvm_dev_ioctl_create_vm(void)
3058 {
3059 int fd, r;
3060 struct inode *inode;
3061 struct file *file;
3062 struct kvm *kvm;
3063
3064 kvm = kvm_create_vm();
3065 if (IS_ERR(kvm))
3066 return PTR_ERR(kvm);
3067 r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
3068 if (r) {
3069 kvm_destroy_vm(kvm);
3070 return r;
3071 }
3072
3073 kvm->filp = file;
3074
3075 return fd;
3076 }
3077
3078 static long kvm_dev_ioctl(struct file *filp,
3079 unsigned int ioctl, unsigned long arg)
3080 {
3081 void __user *argp = (void __user *)arg;
3082 long r = -EINVAL;
3083
3084 switch (ioctl) {
3085 case KVM_GET_API_VERSION:
3086 r = -EINVAL;
3087 if (arg)
3088 goto out;
3089 r = KVM_API_VERSION;
3090 break;
3091 case KVM_CREATE_VM:
3092 r = -EINVAL;
3093 if (arg)
3094 goto out;
3095 r = kvm_dev_ioctl_create_vm();
3096 break;
3097 case KVM_GET_MSR_INDEX_LIST: {
3098 struct kvm_msr_list __user *user_msr_list = argp;
3099 struct kvm_msr_list msr_list;
3100 unsigned n;
3101
3102 r = -EFAULT;
3103 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
3104 goto out;
3105 n = msr_list.nmsrs;
3106 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
3107 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
3108 goto out;
3109 r = -E2BIG;
3110 if (n < num_msrs_to_save)
3111 goto out;
3112 r = -EFAULT;
3113 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
3114 num_msrs_to_save * sizeof(u32)))
3115 goto out;
3116 if (copy_to_user(user_msr_list->indices
3117 + num_msrs_to_save * sizeof(u32),
3118 &emulated_msrs,
3119 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
3120 goto out;
3121 r = 0;
3122 break;
3123 }
3124 case KVM_CHECK_EXTENSION: {
3125 int ext = (long)argp;
3126
3127 switch (ext) {
3128 case KVM_CAP_IRQCHIP:
3129 case KVM_CAP_HLT:
3130 r = 1;
3131 break;
3132 default:
3133 r = 0;
3134 break;
3135 }
3136 break;
3137 }
3138 case KVM_GET_VCPU_MMAP_SIZE:
3139 r = -EINVAL;
3140 if (arg)
3141 goto out;
3142 r = 2 * PAGE_SIZE;
3143 break;
3144 default:
3145 ;
3146 }
3147 out:
3148 return r;
3149 }
3150
3151 static struct file_operations kvm_chardev_ops = {
3152 .unlocked_ioctl = kvm_dev_ioctl,
3153 .compat_ioctl = kvm_dev_ioctl,
3154 };
3155
3156 static struct miscdevice kvm_dev = {
3157 KVM_MINOR,
3158 "kvm",
3159 &kvm_chardev_ops,
3160 };
3161
3162 /*
3163 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
3164 * cached on it.
3165 */
3166 static void decache_vcpus_on_cpu(int cpu)
3167 {
3168 struct kvm *vm;
3169 struct kvm_vcpu *vcpu;
3170 int i;
3171
3172 spin_lock(&kvm_lock);
3173 list_for_each_entry(vm, &vm_list, vm_list)
3174 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3175 vcpu = vm->vcpus[i];
3176 if (!vcpu)
3177 continue;
3178 /*
3179 * If the vcpu is locked, then it is running on some
3180 * other cpu and therefore it is not cached on the
3181 * cpu in question.
3182 *
3183 * If it's not locked, check the last cpu it executed
3184 * on.
3185 */
3186 if (mutex_trylock(&vcpu->mutex)) {
3187 if (vcpu->cpu == cpu) {
3188 kvm_arch_ops->vcpu_decache(vcpu);
3189 vcpu->cpu = -1;
3190 }
3191 mutex_unlock(&vcpu->mutex);
3192 }
3193 }
3194 spin_unlock(&kvm_lock);
3195 }
3196
3197 static void hardware_enable(void *junk)
3198 {
3199 int cpu = raw_smp_processor_id();
3200
3201 if (cpu_isset(cpu, cpus_hardware_enabled))
3202 return;
3203 cpu_set(cpu, cpus_hardware_enabled);
3204 kvm_arch_ops->hardware_enable(NULL);
3205 }
3206
3207 static void hardware_disable(void *junk)
3208 {
3209 int cpu = raw_smp_processor_id();
3210
3211 if (!cpu_isset(cpu, cpus_hardware_enabled))
3212 return;
3213 cpu_clear(cpu, cpus_hardware_enabled);
3214 decache_vcpus_on_cpu(cpu);
3215 kvm_arch_ops->hardware_disable(NULL);
3216 }
3217
3218 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3219 void *v)
3220 {
3221 int cpu = (long)v;
3222
3223 switch (val) {
3224 case CPU_DYING:
3225 case CPU_DYING_FROZEN:
3226 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3227 cpu);
3228 hardware_disable(NULL);
3229 break;
3230 case CPU_UP_CANCELED:
3231 case CPU_UP_CANCELED_FROZEN:
3232 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3233 cpu);
3234 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
3235 break;
3236 case CPU_ONLINE:
3237 case CPU_ONLINE_FROZEN:
3238 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
3239 cpu);
3240 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
3241 break;
3242 }
3243 return NOTIFY_OK;
3244 }
3245
3246 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3247 void *v)
3248 {
3249 if (val == SYS_RESTART) {
3250 /*
3251 * Some (well, at least mine) BIOSes hang on reboot if
3252 * in vmx root mode.
3253 */
3254 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
3255 on_each_cpu(hardware_disable, NULL, 0, 1);
3256 }
3257 return NOTIFY_OK;
3258 }
3259
3260 static struct notifier_block kvm_reboot_notifier = {
3261 .notifier_call = kvm_reboot,
3262 .priority = 0,
3263 };
3264
3265 void kvm_io_bus_init(struct kvm_io_bus *bus)
3266 {
3267 memset(bus, 0, sizeof(*bus));
3268 }
3269
3270 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3271 {
3272 int i;
3273
3274 for (i = 0; i < bus->dev_count; i++) {
3275 struct kvm_io_device *pos = bus->devs[i];
3276
3277 kvm_iodevice_destructor(pos);
3278 }
3279 }
3280
3281 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
3282 {
3283 int i;
3284
3285 for (i = 0; i < bus->dev_count; i++) {
3286 struct kvm_io_device *pos = bus->devs[i];
3287
3288 if (pos->in_range(pos, addr))
3289 return pos;
3290 }
3291
3292 return NULL;
3293 }
3294
3295 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
3296 {
3297 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
3298
3299 bus->devs[bus->dev_count++] = dev;
3300 }
3301
3302 static struct notifier_block kvm_cpu_notifier = {
3303 .notifier_call = kvm_cpu_hotplug,
3304 .priority = 20, /* must be > scheduler priority */
3305 };
3306
3307 static u64 stat_get(void *_offset)
3308 {
3309 unsigned offset = (long)_offset;
3310 u64 total = 0;
3311 struct kvm *kvm;
3312 struct kvm_vcpu *vcpu;
3313 int i;
3314
3315 spin_lock(&kvm_lock);
3316 list_for_each_entry(kvm, &vm_list, vm_list)
3317 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3318 vcpu = kvm->vcpus[i];
3319 if (vcpu)
3320 total += *(u32 *)((void *)vcpu + offset);
3321 }
3322 spin_unlock(&kvm_lock);
3323 return total;
3324 }
3325
3326 DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, NULL, "%llu\n");
3327
3328 static __init void kvm_init_debug(void)
3329 {
3330 struct kvm_stats_debugfs_item *p;
3331
3332 debugfs_dir = debugfs_create_dir("kvm", NULL);
3333 for (p = debugfs_entries; p->name; ++p)
3334 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3335 (void *)(long)p->offset,
3336 &stat_fops);
3337 }
3338
3339 static void kvm_exit_debug(void)
3340 {
3341 struct kvm_stats_debugfs_item *p;
3342
3343 for (p = debugfs_entries; p->name; ++p)
3344 debugfs_remove(p->dentry);
3345 debugfs_remove(debugfs_dir);
3346 }
3347
3348 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3349 {
3350 hardware_disable(NULL);
3351 return 0;
3352 }
3353
3354 static int kvm_resume(struct sys_device *dev)
3355 {
3356 hardware_enable(NULL);
3357 return 0;
3358 }
3359
3360 static struct sysdev_class kvm_sysdev_class = {
3361 set_kset_name("kvm"),
3362 .suspend = kvm_suspend,
3363 .resume = kvm_resume,
3364 };
3365
3366 static struct sys_device kvm_sysdev = {
3367 .id = 0,
3368 .cls = &kvm_sysdev_class,
3369 };
3370
3371 hpa_t bad_page_address;
3372
3373 static inline
3374 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3375 {
3376 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3377 }
3378
3379 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3380 {
3381 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3382
3383 kvm_arch_ops->vcpu_load(vcpu, cpu);
3384 }
3385
3386 static void kvm_sched_out(struct preempt_notifier *pn,
3387 struct task_struct *next)
3388 {
3389 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3390
3391 kvm_arch_ops->vcpu_put(vcpu);
3392 }
3393
3394 int kvm_init_arch(struct kvm_arch_ops *ops, unsigned int vcpu_size,
3395 struct module *module)
3396 {
3397 int r;
3398 int cpu;
3399
3400 if (kvm_arch_ops) {
3401 printk(KERN_ERR "kvm: already loaded the other module\n");
3402 return -EEXIST;
3403 }
3404
3405 if (!ops->cpu_has_kvm_support()) {
3406 printk(KERN_ERR "kvm: no hardware support\n");
3407 return -EOPNOTSUPP;
3408 }
3409 if (ops->disabled_by_bios()) {
3410 printk(KERN_ERR "kvm: disabled by bios\n");
3411 return -EOPNOTSUPP;
3412 }
3413
3414 kvm_arch_ops = ops;
3415
3416 r = kvm_arch_ops->hardware_setup();
3417 if (r < 0)
3418 goto out;
3419
3420 for_each_online_cpu(cpu) {
3421 smp_call_function_single(cpu,
3422 kvm_arch_ops->check_processor_compatibility,
3423 &r, 0, 1);
3424 if (r < 0)
3425 goto out_free_0;
3426 }
3427
3428 on_each_cpu(hardware_enable, NULL, 0, 1);
3429 r = register_cpu_notifier(&kvm_cpu_notifier);
3430 if (r)
3431 goto out_free_1;
3432 register_reboot_notifier(&kvm_reboot_notifier);
3433
3434 r = sysdev_class_register(&kvm_sysdev_class);
3435 if (r)
3436 goto out_free_2;
3437
3438 r = sysdev_register(&kvm_sysdev);
3439 if (r)
3440 goto out_free_3;
3441
3442 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3443 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
3444 __alignof__(struct kvm_vcpu), 0, 0);
3445 if (!kvm_vcpu_cache) {
3446 r = -ENOMEM;
3447 goto out_free_4;
3448 }
3449
3450 kvm_chardev_ops.owner = module;
3451
3452 r = misc_register(&kvm_dev);
3453 if (r) {
3454 printk (KERN_ERR "kvm: misc device register failed\n");
3455 goto out_free;
3456 }
3457
3458 kvm_preempt_ops.sched_in = kvm_sched_in;
3459 kvm_preempt_ops.sched_out = kvm_sched_out;
3460
3461 return r;
3462
3463 out_free:
3464 kmem_cache_destroy(kvm_vcpu_cache);
3465 out_free_4:
3466 sysdev_unregister(&kvm_sysdev);
3467 out_free_3:
3468 sysdev_class_unregister(&kvm_sysdev_class);
3469 out_free_2:
3470 unregister_reboot_notifier(&kvm_reboot_notifier);
3471 unregister_cpu_notifier(&kvm_cpu_notifier);
3472 out_free_1:
3473 on_each_cpu(hardware_disable, NULL, 0, 1);
3474 out_free_0:
3475 kvm_arch_ops->hardware_unsetup();
3476 out:
3477 kvm_arch_ops = NULL;
3478 return r;
3479 }
3480
3481 void kvm_exit_arch(void)
3482 {
3483 misc_deregister(&kvm_dev);
3484 kmem_cache_destroy(kvm_vcpu_cache);
3485 sysdev_unregister(&kvm_sysdev);
3486 sysdev_class_unregister(&kvm_sysdev_class);
3487 unregister_reboot_notifier(&kvm_reboot_notifier);
3488 unregister_cpu_notifier(&kvm_cpu_notifier);
3489 on_each_cpu(hardware_disable, NULL, 0, 1);
3490 kvm_arch_ops->hardware_unsetup();
3491 kvm_arch_ops = NULL;
3492 }
3493
3494 static __init int kvm_init(void)
3495 {
3496 static struct page *bad_page;
3497 int r;
3498
3499 r = kvm_mmu_module_init();
3500 if (r)
3501 goto out4;
3502
3503 kvm_init_debug();
3504
3505 kvm_init_msr_list();
3506
3507 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3508 r = -ENOMEM;
3509 goto out;
3510 }
3511
3512 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3513 memset(__va(bad_page_address), 0, PAGE_SIZE);
3514
3515 return 0;
3516
3517 out:
3518 kvm_exit_debug();
3519 kvm_mmu_module_exit();
3520 out4:
3521 return r;
3522 }
3523
3524 static __exit void kvm_exit(void)
3525 {
3526 kvm_exit_debug();
3527 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
3528 kvm_mmu_module_exit();
3529 }
3530
3531 module_init(kvm_init)
3532 module_exit(kvm_exit)
3533
3534 EXPORT_SYMBOL_GPL(kvm_init_arch);
3535 EXPORT_SYMBOL_GPL(kvm_exit_arch);
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