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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[pv_ops_mirror.git] / drivers / kvm / kvm_main.c
blob07ae280e8fe5c279f7077b1e95650949002e44d7
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 #include <linux/profile.h>
42
43 #include <asm/processor.h>
44 #include <asm/msr.h>
45 #include <asm/io.h>
46 #include <asm/uaccess.h>
47 #include <asm/desc.h>
48
49 MODULE_AUTHOR("Qumranet");
50 MODULE_LICENSE("GPL");
51
52 static DEFINE_SPINLOCK(kvm_lock);
53 static LIST_HEAD(vm_list);
54
55 static cpumask_t cpus_hardware_enabled;
56
57 struct kvm_x86_ops *kvm_x86_ops;
58 struct kmem_cache *kvm_vcpu_cache;
59 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
60
61 static __read_mostly struct preempt_ops kvm_preempt_ops;
62
63 #define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
64
65 static struct kvm_stats_debugfs_item {
66 const char *name;
67 int offset;
68 struct dentry *dentry;
69 } debugfs_entries[] = {
70 { "pf_fixed", STAT_OFFSET(pf_fixed) },
71 { "pf_guest", STAT_OFFSET(pf_guest) },
72 { "tlb_flush", STAT_OFFSET(tlb_flush) },
73 { "invlpg", STAT_OFFSET(invlpg) },
74 { "exits", STAT_OFFSET(exits) },
75 { "io_exits", STAT_OFFSET(io_exits) },
76 { "mmio_exits", STAT_OFFSET(mmio_exits) },
77 { "signal_exits", STAT_OFFSET(signal_exits) },
78 { "irq_window", STAT_OFFSET(irq_window_exits) },
79 { "halt_exits", STAT_OFFSET(halt_exits) },
80 { "halt_wakeup", STAT_OFFSET(halt_wakeup) },
81 { "request_irq", STAT_OFFSET(request_irq_exits) },
82 { "irq_exits", STAT_OFFSET(irq_exits) },
83 { "light_exits", STAT_OFFSET(light_exits) },
84 { "efer_reload", STAT_OFFSET(efer_reload) },
85 { NULL }
86 };
87
88 static struct dentry *debugfs_dir;
89
90 #define MAX_IO_MSRS 256
91
92 #define CR0_RESERVED_BITS \
93 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
94 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
95 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
96 #define CR4_RESERVED_BITS \
97 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
98 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
99 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
100 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
101
102 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
103 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
104
105 #ifdef CONFIG_X86_64
106 // LDT or TSS descriptor in the GDT. 16 bytes.
107 struct segment_descriptor_64 {
108 struct segment_descriptor s;
109 u32 base_higher;
110 u32 pad_zero;
111 };
112
113 #endif
114
115 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
116 unsigned long arg);
117
118 unsigned long segment_base(u16 selector)
119 {
120 struct descriptor_table gdt;
121 struct segment_descriptor *d;
122 unsigned long table_base;
123 typedef unsigned long ul;
124 unsigned long v;
125
126 if (selector == 0)
127 return 0;
128
129 asm ("sgdt %0" : "=m"(gdt));
130 table_base = gdt.base;
131
132 if (selector & 4) { /* from ldt */
133 u16 ldt_selector;
134
135 asm ("sldt %0" : "=g"(ldt_selector));
136 table_base = segment_base(ldt_selector);
137 }
138 d = (struct segment_descriptor *)(table_base + (selector & ~7));
139 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
140 #ifdef CONFIG_X86_64
141 if (d->system == 0
142 && (d->type == 2 || d->type == 9 || d->type == 11))
143 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
144 #endif
145 return v;
146 }
147 EXPORT_SYMBOL_GPL(segment_base);
148
149 static inline int valid_vcpu(int n)
150 {
151 return likely(n >= 0 && n < KVM_MAX_VCPUS);
152 }
153
154 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
155 {
156 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
157 return;
158
159 vcpu->guest_fpu_loaded = 1;
160 fx_save(&vcpu->host_fx_image);
161 fx_restore(&vcpu->guest_fx_image);
162 }
163 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
164
165 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
166 {
167 if (!vcpu->guest_fpu_loaded)
168 return;
169
170 vcpu->guest_fpu_loaded = 0;
171 fx_save(&vcpu->guest_fx_image);
172 fx_restore(&vcpu->host_fx_image);
173 }
174 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
175
176 /*
177 * Switches to specified vcpu, until a matching vcpu_put()
178 */
179 static void vcpu_load(struct kvm_vcpu *vcpu)
180 {
181 int cpu;
182
183 mutex_lock(&vcpu->mutex);
184 cpu = get_cpu();
185 preempt_notifier_register(&vcpu->preempt_notifier);
186 kvm_x86_ops->vcpu_load(vcpu, cpu);
187 put_cpu();
188 }
189
190 static void vcpu_put(struct kvm_vcpu *vcpu)
191 {
192 preempt_disable();
193 kvm_x86_ops->vcpu_put(vcpu);
194 preempt_notifier_unregister(&vcpu->preempt_notifier);
195 preempt_enable();
196 mutex_unlock(&vcpu->mutex);
197 }
198
199 static void ack_flush(void *_completed)
200 {
201 }
202
203 void kvm_flush_remote_tlbs(struct kvm *kvm)
204 {
205 int i, cpu;
206 cpumask_t cpus;
207 struct kvm_vcpu *vcpu;
208
209 cpus_clear(cpus);
210 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
211 vcpu = kvm->vcpus[i];
212 if (!vcpu)
213 continue;
214 if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests))
215 continue;
216 cpu = vcpu->cpu;
217 if (cpu != -1 && cpu != raw_smp_processor_id())
218 cpu_set(cpu, cpus);
219 }
220 smp_call_function_mask(cpus, ack_flush, NULL, 1);
221 }
222
223 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
224 {
225 struct page *page;
226 int r;
227
228 mutex_init(&vcpu->mutex);
229 vcpu->cpu = -1;
230 vcpu->mmu.root_hpa = INVALID_PAGE;
231 vcpu->kvm = kvm;
232 vcpu->vcpu_id = id;
233 if (!irqchip_in_kernel(kvm) || id == 0)
234 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
235 else
236 vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
237 init_waitqueue_head(&vcpu->wq);
238
239 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
240 if (!page) {
241 r = -ENOMEM;
242 goto fail;
243 }
244 vcpu->run = page_address(page);
245
246 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
247 if (!page) {
248 r = -ENOMEM;
249 goto fail_free_run;
250 }
251 vcpu->pio_data = page_address(page);
252
253 r = kvm_mmu_create(vcpu);
254 if (r < 0)
255 goto fail_free_pio_data;
256
257 return 0;
258
259 fail_free_pio_data:
260 free_page((unsigned long)vcpu->pio_data);
261 fail_free_run:
262 free_page((unsigned long)vcpu->run);
263 fail:
264 return -ENOMEM;
265 }
266 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
267
268 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
269 {
270 kvm_mmu_destroy(vcpu);
271 if (vcpu->apic)
272 hrtimer_cancel(&vcpu->apic->timer.dev);
273 kvm_free_apic(vcpu->apic);
274 free_page((unsigned long)vcpu->pio_data);
275 free_page((unsigned long)vcpu->run);
276 }
277 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
278
279 static struct kvm *kvm_create_vm(void)
280 {
281 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
282
283 if (!kvm)
284 return ERR_PTR(-ENOMEM);
285
286 kvm_io_bus_init(&kvm->pio_bus);
287 mutex_init(&kvm->lock);
288 INIT_LIST_HEAD(&kvm->active_mmu_pages);
289 kvm_io_bus_init(&kvm->mmio_bus);
290 spin_lock(&kvm_lock);
291 list_add(&kvm->vm_list, &vm_list);
292 spin_unlock(&kvm_lock);
293 return kvm;
294 }
295
296 /*
297 * Free any memory in @free but not in @dont.
298 */
299 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
300 struct kvm_memory_slot *dont)
301 {
302 int i;
303
304 if (!dont || free->phys_mem != dont->phys_mem)
305 if (free->phys_mem) {
306 for (i = 0; i < free->npages; ++i)
307 if (free->phys_mem[i])
308 __free_page(free->phys_mem[i]);
309 vfree(free->phys_mem);
310 }
311
312 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
313 vfree(free->dirty_bitmap);
314
315 free->phys_mem = NULL;
316 free->npages = 0;
317 free->dirty_bitmap = NULL;
318 }
319
320 static void kvm_free_physmem(struct kvm *kvm)
321 {
322 int i;
323
324 for (i = 0; i < kvm->nmemslots; ++i)
325 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
326 }
327
328 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
329 {
330 int i;
331
332 for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
333 if (vcpu->pio.guest_pages[i]) {
334 __free_page(vcpu->pio.guest_pages[i]);
335 vcpu->pio.guest_pages[i] = NULL;
336 }
337 }
338
339 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
340 {
341 vcpu_load(vcpu);
342 kvm_mmu_unload(vcpu);
343 vcpu_put(vcpu);
344 }
345
346 static void kvm_free_vcpus(struct kvm *kvm)
347 {
348 unsigned int i;
349
350 /*
351 * Unpin any mmu pages first.
352 */
353 for (i = 0; i < KVM_MAX_VCPUS; ++i)
354 if (kvm->vcpus[i])
355 kvm_unload_vcpu_mmu(kvm->vcpus[i]);
356 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
357 if (kvm->vcpus[i]) {
358 kvm_x86_ops->vcpu_free(kvm->vcpus[i]);
359 kvm->vcpus[i] = NULL;
360 }
361 }
362
363 }
364
365 static void kvm_destroy_vm(struct kvm *kvm)
366 {
367 spin_lock(&kvm_lock);
368 list_del(&kvm->vm_list);
369 spin_unlock(&kvm_lock);
370 kvm_io_bus_destroy(&kvm->pio_bus);
371 kvm_io_bus_destroy(&kvm->mmio_bus);
372 kfree(kvm->vpic);
373 kfree(kvm->vioapic);
374 kvm_free_vcpus(kvm);
375 kvm_free_physmem(kvm);
376 kfree(kvm);
377 }
378
379 static int kvm_vm_release(struct inode *inode, struct file *filp)
380 {
381 struct kvm *kvm = filp->private_data;
382
383 kvm_destroy_vm(kvm);
384 return 0;
385 }
386
387 static void inject_gp(struct kvm_vcpu *vcpu)
388 {
389 kvm_x86_ops->inject_gp(vcpu, 0);
390 }
391
392 /*
393 * Load the pae pdptrs. Return true is they are all valid.
394 */
395 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
396 {
397 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
398 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
399 int i;
400 u64 *pdpt;
401 int ret;
402 struct page *page;
403 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
404
405 mutex_lock(&vcpu->kvm->lock);
406 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
407 if (!page) {
408 ret = 0;
409 goto out;
410 }
411
412 pdpt = kmap_atomic(page, KM_USER0);
413 memcpy(pdpte, pdpt+offset, sizeof(pdpte));
414 kunmap_atomic(pdpt, KM_USER0);
415
416 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
417 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
418 ret = 0;
419 goto out;
420 }
421 }
422 ret = 1;
423
424 memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
425 out:
426 mutex_unlock(&vcpu->kvm->lock);
427
428 return ret;
429 }
430
431 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
432 {
433 if (cr0 & CR0_RESERVED_BITS) {
434 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
435 cr0, vcpu->cr0);
436 inject_gp(vcpu);
437 return;
438 }
439
440 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
441 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
442 inject_gp(vcpu);
443 return;
444 }
445
446 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
447 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
448 "and a clear PE flag\n");
449 inject_gp(vcpu);
450 return;
451 }
452
453 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
454 #ifdef CONFIG_X86_64
455 if ((vcpu->shadow_efer & EFER_LME)) {
456 int cs_db, cs_l;
457
458 if (!is_pae(vcpu)) {
459 printk(KERN_DEBUG "set_cr0: #GP, start paging "
460 "in long mode while PAE is disabled\n");
461 inject_gp(vcpu);
462 return;
463 }
464 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
465 if (cs_l) {
466 printk(KERN_DEBUG "set_cr0: #GP, start paging "
467 "in long mode while CS.L == 1\n");
468 inject_gp(vcpu);
469 return;
470
471 }
472 } else
473 #endif
474 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
475 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
476 "reserved bits\n");
477 inject_gp(vcpu);
478 return;
479 }
480
481 }
482
483 kvm_x86_ops->set_cr0(vcpu, cr0);
484 vcpu->cr0 = cr0;
485
486 mutex_lock(&vcpu->kvm->lock);
487 kvm_mmu_reset_context(vcpu);
488 mutex_unlock(&vcpu->kvm->lock);
489 return;
490 }
491 EXPORT_SYMBOL_GPL(set_cr0);
492
493 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
494 {
495 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
496 }
497 EXPORT_SYMBOL_GPL(lmsw);
498
499 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
500 {
501 if (cr4 & CR4_RESERVED_BITS) {
502 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
503 inject_gp(vcpu);
504 return;
505 }
506
507 if (is_long_mode(vcpu)) {
508 if (!(cr4 & X86_CR4_PAE)) {
509 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
510 "in long mode\n");
511 inject_gp(vcpu);
512 return;
513 }
514 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
515 && !load_pdptrs(vcpu, vcpu->cr3)) {
516 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
517 inject_gp(vcpu);
518 return;
519 }
520
521 if (cr4 & X86_CR4_VMXE) {
522 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
523 inject_gp(vcpu);
524 return;
525 }
526 kvm_x86_ops->set_cr4(vcpu, cr4);
527 vcpu->cr4 = cr4;
528 mutex_lock(&vcpu->kvm->lock);
529 kvm_mmu_reset_context(vcpu);
530 mutex_unlock(&vcpu->kvm->lock);
531 }
532 EXPORT_SYMBOL_GPL(set_cr4);
533
534 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
535 {
536 if (is_long_mode(vcpu)) {
537 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
538 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
539 inject_gp(vcpu);
540 return;
541 }
542 } else {
543 if (is_pae(vcpu)) {
544 if (cr3 & CR3_PAE_RESERVED_BITS) {
545 printk(KERN_DEBUG
546 "set_cr3: #GP, reserved bits\n");
547 inject_gp(vcpu);
548 return;
549 }
550 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
551 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
552 "reserved bits\n");
553 inject_gp(vcpu);
554 return;
555 }
556 } else {
557 if (cr3 & CR3_NONPAE_RESERVED_BITS) {
558 printk(KERN_DEBUG
559 "set_cr3: #GP, reserved bits\n");
560 inject_gp(vcpu);
561 return;
562 }
563 }
564 }
565
566 mutex_lock(&vcpu->kvm->lock);
567 /*
568 * Does the new cr3 value map to physical memory? (Note, we
569 * catch an invalid cr3 even in real-mode, because it would
570 * cause trouble later on when we turn on paging anyway.)
571 *
572 * A real CPU would silently accept an invalid cr3 and would
573 * attempt to use it - with largely undefined (and often hard
574 * to debug) behavior on the guest side.
575 */
576 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
577 inject_gp(vcpu);
578 else {
579 vcpu->cr3 = cr3;
580 vcpu->mmu.new_cr3(vcpu);
581 }
582 mutex_unlock(&vcpu->kvm->lock);
583 }
584 EXPORT_SYMBOL_GPL(set_cr3);
585
586 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
587 {
588 if (cr8 & CR8_RESERVED_BITS) {
589 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
590 inject_gp(vcpu);
591 return;
592 }
593 if (irqchip_in_kernel(vcpu->kvm))
594 kvm_lapic_set_tpr(vcpu, cr8);
595 else
596 vcpu->cr8 = cr8;
597 }
598 EXPORT_SYMBOL_GPL(set_cr8);
599
600 unsigned long get_cr8(struct kvm_vcpu *vcpu)
601 {
602 if (irqchip_in_kernel(vcpu->kvm))
603 return kvm_lapic_get_cr8(vcpu);
604 else
605 return vcpu->cr8;
606 }
607 EXPORT_SYMBOL_GPL(get_cr8);
608
609 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
610 {
611 if (irqchip_in_kernel(vcpu->kvm))
612 return vcpu->apic_base;
613 else
614 return vcpu->apic_base;
615 }
616 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
617
618 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
619 {
620 /* TODO: reserve bits check */
621 if (irqchip_in_kernel(vcpu->kvm))
622 kvm_lapic_set_base(vcpu, data);
623 else
624 vcpu->apic_base = data;
625 }
626 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
627
628 void fx_init(struct kvm_vcpu *vcpu)
629 {
630 unsigned after_mxcsr_mask;
631
632 /* Initialize guest FPU by resetting ours and saving into guest's */
633 preempt_disable();
634 fx_save(&vcpu->host_fx_image);
635 fpu_init();
636 fx_save(&vcpu->guest_fx_image);
637 fx_restore(&vcpu->host_fx_image);
638 preempt_enable();
639
640 vcpu->cr0 |= X86_CR0_ET;
641 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
642 vcpu->guest_fx_image.mxcsr = 0x1f80;
643 memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
644 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
645 }
646 EXPORT_SYMBOL_GPL(fx_init);
647
648 /*
649 * Allocate some memory and give it an address in the guest physical address
650 * space.
651 *
652 * Discontiguous memory is allowed, mostly for framebuffers.
653 */
654 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
655 struct kvm_memory_region *mem)
656 {
657 int r;
658 gfn_t base_gfn;
659 unsigned long npages;
660 unsigned long i;
661 struct kvm_memory_slot *memslot;
662 struct kvm_memory_slot old, new;
663
664 r = -EINVAL;
665 /* General sanity checks */
666 if (mem->memory_size & (PAGE_SIZE - 1))
667 goto out;
668 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
669 goto out;
670 if (mem->slot >= KVM_MEMORY_SLOTS)
671 goto out;
672 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
673 goto out;
674
675 memslot = &kvm->memslots[mem->slot];
676 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
677 npages = mem->memory_size >> PAGE_SHIFT;
678
679 if (!npages)
680 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
681
682 mutex_lock(&kvm->lock);
683
684 new = old = *memslot;
685
686 new.base_gfn = base_gfn;
687 new.npages = npages;
688 new.flags = mem->flags;
689
690 /* Disallow changing a memory slot's size. */
691 r = -EINVAL;
692 if (npages && old.npages && npages != old.npages)
693 goto out_unlock;
694
695 /* Check for overlaps */
696 r = -EEXIST;
697 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
698 struct kvm_memory_slot *s = &kvm->memslots[i];
699
700 if (s == memslot)
701 continue;
702 if (!((base_gfn + npages <= s->base_gfn) ||
703 (base_gfn >= s->base_gfn + s->npages)))
704 goto out_unlock;
705 }
706
707 /* Deallocate if slot is being removed */
708 if (!npages)
709 new.phys_mem = NULL;
710
711 /* Free page dirty bitmap if unneeded */
712 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
713 new.dirty_bitmap = NULL;
714
715 r = -ENOMEM;
716
717 /* Allocate if a slot is being created */
718 if (npages && !new.phys_mem) {
719 new.phys_mem = vmalloc(npages * sizeof(struct page *));
720
721 if (!new.phys_mem)
722 goto out_unlock;
723
724 memset(new.phys_mem, 0, npages * sizeof(struct page *));
725 for (i = 0; i < npages; ++i) {
726 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
727 | __GFP_ZERO);
728 if (!new.phys_mem[i])
729 goto out_unlock;
730 set_page_private(new.phys_mem[i],0);
731 }
732 }
733
734 /* Allocate page dirty bitmap if needed */
735 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
736 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
737
738 new.dirty_bitmap = vmalloc(dirty_bytes);
739 if (!new.dirty_bitmap)
740 goto out_unlock;
741 memset(new.dirty_bitmap, 0, dirty_bytes);
742 }
743
744 if (mem->slot >= kvm->nmemslots)
745 kvm->nmemslots = mem->slot + 1;
746
747 *memslot = new;
748
749 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
750 kvm_flush_remote_tlbs(kvm);
751
752 mutex_unlock(&kvm->lock);
753
754 kvm_free_physmem_slot(&old, &new);
755 return 0;
756
757 out_unlock:
758 mutex_unlock(&kvm->lock);
759 kvm_free_physmem_slot(&new, &old);
760 out:
761 return r;
762 }
763
764 /*
765 * Get (and clear) the dirty memory log for a memory slot.
766 */
767 static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
768 struct kvm_dirty_log *log)
769 {
770 struct kvm_memory_slot *memslot;
771 int r, i;
772 int n;
773 unsigned long any = 0;
774
775 mutex_lock(&kvm->lock);
776
777 r = -EINVAL;
778 if (log->slot >= KVM_MEMORY_SLOTS)
779 goto out;
780
781 memslot = &kvm->memslots[log->slot];
782 r = -ENOENT;
783 if (!memslot->dirty_bitmap)
784 goto out;
785
786 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
787
788 for (i = 0; !any && i < n/sizeof(long); ++i)
789 any = memslot->dirty_bitmap[i];
790
791 r = -EFAULT;
792 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
793 goto out;
794
795 /* If nothing is dirty, don't bother messing with page tables. */
796 if (any) {
797 kvm_mmu_slot_remove_write_access(kvm, log->slot);
798 kvm_flush_remote_tlbs(kvm);
799 memset(memslot->dirty_bitmap, 0, n);
800 }
801
802 r = 0;
803
804 out:
805 mutex_unlock(&kvm->lock);
806 return r;
807 }
808
809 /*
810 * Set a new alias region. Aliases map a portion of physical memory into
811 * another portion. This is useful for memory windows, for example the PC
812 * VGA region.
813 */
814 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
815 struct kvm_memory_alias *alias)
816 {
817 int r, n;
818 struct kvm_mem_alias *p;
819
820 r = -EINVAL;
821 /* General sanity checks */
822 if (alias->memory_size & (PAGE_SIZE - 1))
823 goto out;
824 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
825 goto out;
826 if (alias->slot >= KVM_ALIAS_SLOTS)
827 goto out;
828 if (alias->guest_phys_addr + alias->memory_size
829 < alias->guest_phys_addr)
830 goto out;
831 if (alias->target_phys_addr + alias->memory_size
832 < alias->target_phys_addr)
833 goto out;
834
835 mutex_lock(&kvm->lock);
836
837 p = &kvm->aliases[alias->slot];
838 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
839 p->npages = alias->memory_size >> PAGE_SHIFT;
840 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
841
842 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
843 if (kvm->aliases[n - 1].npages)
844 break;
845 kvm->naliases = n;
846
847 kvm_mmu_zap_all(kvm);
848
849 mutex_unlock(&kvm->lock);
850
851 return 0;
852
853 out:
854 return r;
855 }
856
857 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
858 {
859 int r;
860
861 r = 0;
862 switch (chip->chip_id) {
863 case KVM_IRQCHIP_PIC_MASTER:
864 memcpy (&chip->chip.pic,
865 &pic_irqchip(kvm)->pics[0],
866 sizeof(struct kvm_pic_state));
867 break;
868 case KVM_IRQCHIP_PIC_SLAVE:
869 memcpy (&chip->chip.pic,
870 &pic_irqchip(kvm)->pics[1],
871 sizeof(struct kvm_pic_state));
872 break;
873 case KVM_IRQCHIP_IOAPIC:
874 memcpy (&chip->chip.ioapic,
875 ioapic_irqchip(kvm),
876 sizeof(struct kvm_ioapic_state));
877 break;
878 default:
879 r = -EINVAL;
880 break;
881 }
882 return r;
883 }
884
885 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
886 {
887 int r;
888
889 r = 0;
890 switch (chip->chip_id) {
891 case KVM_IRQCHIP_PIC_MASTER:
892 memcpy (&pic_irqchip(kvm)->pics[0],
893 &chip->chip.pic,
894 sizeof(struct kvm_pic_state));
895 break;
896 case KVM_IRQCHIP_PIC_SLAVE:
897 memcpy (&pic_irqchip(kvm)->pics[1],
898 &chip->chip.pic,
899 sizeof(struct kvm_pic_state));
900 break;
901 case KVM_IRQCHIP_IOAPIC:
902 memcpy (ioapic_irqchip(kvm),
903 &chip->chip.ioapic,
904 sizeof(struct kvm_ioapic_state));
905 break;
906 default:
907 r = -EINVAL;
908 break;
909 }
910 kvm_pic_update_irq(pic_irqchip(kvm));
911 return r;
912 }
913
914 static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
915 {
916 int i;
917 struct kvm_mem_alias *alias;
918
919 for (i = 0; i < kvm->naliases; ++i) {
920 alias = &kvm->aliases[i];
921 if (gfn >= alias->base_gfn
922 && gfn < alias->base_gfn + alias->npages)
923 return alias->target_gfn + gfn - alias->base_gfn;
924 }
925 return gfn;
926 }
927
928 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
929 {
930 int i;
931
932 for (i = 0; i < kvm->nmemslots; ++i) {
933 struct kvm_memory_slot *memslot = &kvm->memslots[i];
934
935 if (gfn >= memslot->base_gfn
936 && gfn < memslot->base_gfn + memslot->npages)
937 return memslot;
938 }
939 return NULL;
940 }
941
942 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
943 {
944 gfn = unalias_gfn(kvm, gfn);
945 return __gfn_to_memslot(kvm, gfn);
946 }
947
948 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
949 {
950 struct kvm_memory_slot *slot;
951
952 gfn = unalias_gfn(kvm, gfn);
953 slot = __gfn_to_memslot(kvm, gfn);
954 if (!slot)
955 return NULL;
956 return slot->phys_mem[gfn - slot->base_gfn];
957 }
958 EXPORT_SYMBOL_GPL(gfn_to_page);
959
960 /* WARNING: Does not work on aliased pages. */
961 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
962 {
963 struct kvm_memory_slot *memslot;
964
965 memslot = __gfn_to_memslot(kvm, gfn);
966 if (memslot && memslot->dirty_bitmap) {
967 unsigned long rel_gfn = gfn - memslot->base_gfn;
968
969 /* avoid RMW */
970 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
971 set_bit(rel_gfn, memslot->dirty_bitmap);
972 }
973 }
974
975 int emulator_read_std(unsigned long addr,
976 void *val,
977 unsigned int bytes,
978 struct kvm_vcpu *vcpu)
979 {
980 void *data = val;
981
982 while (bytes) {
983 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
984 unsigned offset = addr & (PAGE_SIZE-1);
985 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
986 unsigned long pfn;
987 struct page *page;
988 void *page_virt;
989
990 if (gpa == UNMAPPED_GVA)
991 return X86EMUL_PROPAGATE_FAULT;
992 pfn = gpa >> PAGE_SHIFT;
993 page = gfn_to_page(vcpu->kvm, pfn);
994 if (!page)
995 return X86EMUL_UNHANDLEABLE;
996 page_virt = kmap_atomic(page, KM_USER0);
997
998 memcpy(data, page_virt + offset, tocopy);
999
1000 kunmap_atomic(page_virt, KM_USER0);
1001
1002 bytes -= tocopy;
1003 data += tocopy;
1004 addr += tocopy;
1005 }
1006
1007 return X86EMUL_CONTINUE;
1008 }
1009 EXPORT_SYMBOL_GPL(emulator_read_std);
1010
1011 static int emulator_write_std(unsigned long addr,
1012 const void *val,
1013 unsigned int bytes,
1014 struct kvm_vcpu *vcpu)
1015 {
1016 pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
1017 return X86EMUL_UNHANDLEABLE;
1018 }
1019
1020 /*
1021 * Only apic need an MMIO device hook, so shortcut now..
1022 */
1023 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1024 gpa_t addr)
1025 {
1026 struct kvm_io_device *dev;
1027
1028 if (vcpu->apic) {
1029 dev = &vcpu->apic->dev;
1030 if (dev->in_range(dev, addr))
1031 return dev;
1032 }
1033 return NULL;
1034 }
1035
1036 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1037 gpa_t addr)
1038 {
1039 struct kvm_io_device *dev;
1040
1041 dev = vcpu_find_pervcpu_dev(vcpu, addr);
1042 if (dev == NULL)
1043 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1044 return dev;
1045 }
1046
1047 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1048 gpa_t addr)
1049 {
1050 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1051 }
1052
1053 static int emulator_read_emulated(unsigned long addr,
1054 void *val,
1055 unsigned int bytes,
1056 struct kvm_vcpu *vcpu)
1057 {
1058 struct kvm_io_device *mmio_dev;
1059 gpa_t gpa;
1060
1061 if (vcpu->mmio_read_completed) {
1062 memcpy(val, vcpu->mmio_data, bytes);
1063 vcpu->mmio_read_completed = 0;
1064 return X86EMUL_CONTINUE;
1065 } else if (emulator_read_std(addr, val, bytes, vcpu)
1066 == X86EMUL_CONTINUE)
1067 return X86EMUL_CONTINUE;
1068
1069 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1070 if (gpa == UNMAPPED_GVA)
1071 return X86EMUL_PROPAGATE_FAULT;
1072
1073 /*
1074 * Is this MMIO handled locally?
1075 */
1076 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1077 if (mmio_dev) {
1078 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1079 return X86EMUL_CONTINUE;
1080 }
1081
1082 vcpu->mmio_needed = 1;
1083 vcpu->mmio_phys_addr = gpa;
1084 vcpu->mmio_size = bytes;
1085 vcpu->mmio_is_write = 0;
1086
1087 return X86EMUL_UNHANDLEABLE;
1088 }
1089
1090 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1091 const void *val, int bytes)
1092 {
1093 struct page *page;
1094 void *virt;
1095
1096 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1097 return 0;
1098 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1099 if (!page)
1100 return 0;
1101 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
1102 virt = kmap_atomic(page, KM_USER0);
1103 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1104 memcpy(virt + offset_in_page(gpa), val, bytes);
1105 kunmap_atomic(virt, KM_USER0);
1106 return 1;
1107 }
1108
1109 static int emulator_write_emulated_onepage(unsigned long addr,
1110 const void *val,
1111 unsigned int bytes,
1112 struct kvm_vcpu *vcpu)
1113 {
1114 struct kvm_io_device *mmio_dev;
1115 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1116
1117 if (gpa == UNMAPPED_GVA) {
1118 kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
1119 return X86EMUL_PROPAGATE_FAULT;
1120 }
1121
1122 if (emulator_write_phys(vcpu, gpa, val, bytes))
1123 return X86EMUL_CONTINUE;
1124
1125 /*
1126 * Is this MMIO handled locally?
1127 */
1128 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1129 if (mmio_dev) {
1130 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1131 return X86EMUL_CONTINUE;
1132 }
1133
1134 vcpu->mmio_needed = 1;
1135 vcpu->mmio_phys_addr = gpa;
1136 vcpu->mmio_size = bytes;
1137 vcpu->mmio_is_write = 1;
1138 memcpy(vcpu->mmio_data, val, bytes);
1139
1140 return X86EMUL_CONTINUE;
1141 }
1142
1143 int emulator_write_emulated(unsigned long addr,
1144 const void *val,
1145 unsigned int bytes,
1146 struct kvm_vcpu *vcpu)
1147 {
1148 /* Crossing a page boundary? */
1149 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1150 int rc, now;
1151
1152 now = -addr & ~PAGE_MASK;
1153 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1154 if (rc != X86EMUL_CONTINUE)
1155 return rc;
1156 addr += now;
1157 val += now;
1158 bytes -= now;
1159 }
1160 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1161 }
1162 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1163
1164 static int emulator_cmpxchg_emulated(unsigned long addr,
1165 const void *old,
1166 const void *new,
1167 unsigned int bytes,
1168 struct kvm_vcpu *vcpu)
1169 {
1170 static int reported;
1171
1172 if (!reported) {
1173 reported = 1;
1174 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1175 }
1176 return emulator_write_emulated(addr, new, bytes, vcpu);
1177 }
1178
1179 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1180 {
1181 return kvm_x86_ops->get_segment_base(vcpu, seg);
1182 }
1183
1184 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1185 {
1186 return X86EMUL_CONTINUE;
1187 }
1188
1189 int emulate_clts(struct kvm_vcpu *vcpu)
1190 {
1191 vcpu->cr0 &= ~X86_CR0_TS;
1192 kvm_x86_ops->set_cr0(vcpu, vcpu->cr0);
1193 return X86EMUL_CONTINUE;
1194 }
1195
1196 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1197 {
1198 struct kvm_vcpu *vcpu = ctxt->vcpu;
1199
1200 switch (dr) {
1201 case 0 ... 3:
1202 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1203 return X86EMUL_CONTINUE;
1204 default:
1205 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1206 return X86EMUL_UNHANDLEABLE;
1207 }
1208 }
1209
1210 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1211 {
1212 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1213 int exception;
1214
1215 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1216 if (exception) {
1217 /* FIXME: better handling */
1218 return X86EMUL_UNHANDLEABLE;
1219 }
1220 return X86EMUL_CONTINUE;
1221 }
1222
1223 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
1224 {
1225 static int reported;
1226 u8 opcodes[4];
1227 unsigned long rip = vcpu->rip;
1228 unsigned long rip_linear;
1229
1230 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
1231
1232 if (reported)
1233 return;
1234
1235 emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
1236
1237 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
1238 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1239 reported = 1;
1240 }
1241 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
1242
1243 struct x86_emulate_ops emulate_ops = {
1244 .read_std = emulator_read_std,
1245 .write_std = emulator_write_std,
1246 .read_emulated = emulator_read_emulated,
1247 .write_emulated = emulator_write_emulated,
1248 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1249 };
1250
1251 int emulate_instruction(struct kvm_vcpu *vcpu,
1252 struct kvm_run *run,
1253 unsigned long cr2,
1254 u16 error_code)
1255 {
1256 struct x86_emulate_ctxt emulate_ctxt;
1257 int r;
1258 int cs_db, cs_l;
1259
1260 vcpu->mmio_fault_cr2 = cr2;
1261 kvm_x86_ops->cache_regs(vcpu);
1262
1263 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1264
1265 emulate_ctxt.vcpu = vcpu;
1266 emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
1267 emulate_ctxt.cr2 = cr2;
1268 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1269 ? X86EMUL_MODE_REAL : cs_l
1270 ? X86EMUL_MODE_PROT64 : cs_db
1271 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1272
1273 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1274 emulate_ctxt.cs_base = 0;
1275 emulate_ctxt.ds_base = 0;
1276 emulate_ctxt.es_base = 0;
1277 emulate_ctxt.ss_base = 0;
1278 } else {
1279 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1280 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1281 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1282 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1283 }
1284
1285 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1286 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1287
1288 vcpu->mmio_is_write = 0;
1289 vcpu->pio.string = 0;
1290 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1291 if (vcpu->pio.string)
1292 return EMULATE_DO_MMIO;
1293
1294 if ((r || vcpu->mmio_is_write) && run) {
1295 run->exit_reason = KVM_EXIT_MMIO;
1296 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1297 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1298 run->mmio.len = vcpu->mmio_size;
1299 run->mmio.is_write = vcpu->mmio_is_write;
1300 }
1301
1302 if (r) {
1303 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1304 return EMULATE_DONE;
1305 if (!vcpu->mmio_needed) {
1306 kvm_report_emulation_failure(vcpu, "mmio");
1307 return EMULATE_FAIL;
1308 }
1309 return EMULATE_DO_MMIO;
1310 }
1311
1312 kvm_x86_ops->decache_regs(vcpu);
1313 kvm_x86_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1314
1315 if (vcpu->mmio_is_write) {
1316 vcpu->mmio_needed = 0;
1317 return EMULATE_DO_MMIO;
1318 }
1319
1320 return EMULATE_DONE;
1321 }
1322 EXPORT_SYMBOL_GPL(emulate_instruction);
1323
1324 /*
1325 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1326 */
1327 static void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1328 {
1329 DECLARE_WAITQUEUE(wait, current);
1330
1331 add_wait_queue(&vcpu->wq, &wait);
1332
1333 /*
1334 * We will block until either an interrupt or a signal wakes us up
1335 */
1336 while (!kvm_cpu_has_interrupt(vcpu)
1337 && !signal_pending(current)
1338 && vcpu->mp_state != VCPU_MP_STATE_RUNNABLE
1339 && vcpu->mp_state != VCPU_MP_STATE_SIPI_RECEIVED) {
1340 set_current_state(TASK_INTERRUPTIBLE);
1341 vcpu_put(vcpu);
1342 schedule();
1343 vcpu_load(vcpu);
1344 }
1345
1346 __set_current_state(TASK_RUNNING);
1347 remove_wait_queue(&vcpu->wq, &wait);
1348 }
1349
1350 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1351 {
1352 ++vcpu->stat.halt_exits;
1353 if (irqchip_in_kernel(vcpu->kvm)) {
1354 vcpu->mp_state = VCPU_MP_STATE_HALTED;
1355 kvm_vcpu_block(vcpu);
1356 if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE)
1357 return -EINTR;
1358 return 1;
1359 } else {
1360 vcpu->run->exit_reason = KVM_EXIT_HLT;
1361 return 0;
1362 }
1363 }
1364 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1365
1366 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1367 {
1368 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1369
1370 kvm_x86_ops->cache_regs(vcpu);
1371 ret = -KVM_EINVAL;
1372 #ifdef CONFIG_X86_64
1373 if (is_long_mode(vcpu)) {
1374 nr = vcpu->regs[VCPU_REGS_RAX];
1375 a0 = vcpu->regs[VCPU_REGS_RDI];
1376 a1 = vcpu->regs[VCPU_REGS_RSI];
1377 a2 = vcpu->regs[VCPU_REGS_RDX];
1378 a3 = vcpu->regs[VCPU_REGS_RCX];
1379 a4 = vcpu->regs[VCPU_REGS_R8];
1380 a5 = vcpu->regs[VCPU_REGS_R9];
1381 } else
1382 #endif
1383 {
1384 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1385 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1386 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1387 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1388 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1389 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1390 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1391 }
1392 switch (nr) {
1393 default:
1394 run->hypercall.nr = nr;
1395 run->hypercall.args[0] = a0;
1396 run->hypercall.args[1] = a1;
1397 run->hypercall.args[2] = a2;
1398 run->hypercall.args[3] = a3;
1399 run->hypercall.args[4] = a4;
1400 run->hypercall.args[5] = a5;
1401 run->hypercall.ret = ret;
1402 run->hypercall.longmode = is_long_mode(vcpu);
1403 kvm_x86_ops->decache_regs(vcpu);
1404 return 0;
1405 }
1406 vcpu->regs[VCPU_REGS_RAX] = ret;
1407 kvm_x86_ops->decache_regs(vcpu);
1408 return 1;
1409 }
1410 EXPORT_SYMBOL_GPL(kvm_hypercall);
1411
1412 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1413 {
1414 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1415 }
1416
1417 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1418 {
1419 struct descriptor_table dt = { limit, base };
1420
1421 kvm_x86_ops->set_gdt(vcpu, &dt);
1422 }
1423
1424 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1425 {
1426 struct descriptor_table dt = { limit, base };
1427
1428 kvm_x86_ops->set_idt(vcpu, &dt);
1429 }
1430
1431 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1432 unsigned long *rflags)
1433 {
1434 lmsw(vcpu, msw);
1435 *rflags = kvm_x86_ops->get_rflags(vcpu);
1436 }
1437
1438 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1439 {
1440 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
1441 switch (cr) {
1442 case 0:
1443 return vcpu->cr0;
1444 case 2:
1445 return vcpu->cr2;
1446 case 3:
1447 return vcpu->cr3;
1448 case 4:
1449 return vcpu->cr4;
1450 default:
1451 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1452 return 0;
1453 }
1454 }
1455
1456 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1457 unsigned long *rflags)
1458 {
1459 switch (cr) {
1460 case 0:
1461 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1462 *rflags = kvm_x86_ops->get_rflags(vcpu);
1463 break;
1464 case 2:
1465 vcpu->cr2 = val;
1466 break;
1467 case 3:
1468 set_cr3(vcpu, val);
1469 break;
1470 case 4:
1471 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1472 break;
1473 default:
1474 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1475 }
1476 }
1477
1478 /*
1479 * Register the para guest with the host:
1480 */
1481 static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1482 {
1483 struct kvm_vcpu_para_state *para_state;
1484 hpa_t para_state_hpa, hypercall_hpa;
1485 struct page *para_state_page;
1486 unsigned char *hypercall;
1487 gpa_t hypercall_gpa;
1488
1489 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1490 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1491
1492 /*
1493 * Needs to be page aligned:
1494 */
1495 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1496 goto err_gp;
1497
1498 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1499 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1500 if (is_error_hpa(para_state_hpa))
1501 goto err_gp;
1502
1503 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
1504 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1505 para_state = kmap(para_state_page);
1506
1507 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1508 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1509
1510 para_state->host_version = KVM_PARA_API_VERSION;
1511 /*
1512 * We cannot support guests that try to register themselves
1513 * with a newer API version than the host supports:
1514 */
1515 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1516 para_state->ret = -KVM_EINVAL;
1517 goto err_kunmap_skip;
1518 }
1519
1520 hypercall_gpa = para_state->hypercall_gpa;
1521 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1522 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1523 if (is_error_hpa(hypercall_hpa)) {
1524 para_state->ret = -KVM_EINVAL;
1525 goto err_kunmap_skip;
1526 }
1527
1528 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1529 vcpu->para_state_page = para_state_page;
1530 vcpu->para_state_gpa = para_state_gpa;
1531 vcpu->hypercall_gpa = hypercall_gpa;
1532
1533 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
1534 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1535 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1536 kvm_x86_ops->patch_hypercall(vcpu, hypercall);
1537 kunmap_atomic(hypercall, KM_USER1);
1538
1539 para_state->ret = 0;
1540 err_kunmap_skip:
1541 kunmap(para_state_page);
1542 return 0;
1543 err_gp:
1544 return 1;
1545 }
1546
1547 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1548 {
1549 u64 data;
1550
1551 switch (msr) {
1552 case 0xc0010010: /* SYSCFG */
1553 case 0xc0010015: /* HWCR */
1554 case MSR_IA32_PLATFORM_ID:
1555 case MSR_IA32_P5_MC_ADDR:
1556 case MSR_IA32_P5_MC_TYPE:
1557 case MSR_IA32_MC0_CTL:
1558 case MSR_IA32_MCG_STATUS:
1559 case MSR_IA32_MCG_CAP:
1560 case MSR_IA32_MC0_MISC:
1561 case MSR_IA32_MC0_MISC+4:
1562 case MSR_IA32_MC0_MISC+8:
1563 case MSR_IA32_MC0_MISC+12:
1564 case MSR_IA32_MC0_MISC+16:
1565 case MSR_IA32_UCODE_REV:
1566 case MSR_IA32_PERF_STATUS:
1567 case MSR_IA32_EBL_CR_POWERON:
1568 /* MTRR registers */
1569 case 0xfe:
1570 case 0x200 ... 0x2ff:
1571 data = 0;
1572 break;
1573 case 0xcd: /* fsb frequency */
1574 data = 3;
1575 break;
1576 case MSR_IA32_APICBASE:
1577 data = kvm_get_apic_base(vcpu);
1578 break;
1579 case MSR_IA32_MISC_ENABLE:
1580 data = vcpu->ia32_misc_enable_msr;
1581 break;
1582 #ifdef CONFIG_X86_64
1583 case MSR_EFER:
1584 data = vcpu->shadow_efer;
1585 break;
1586 #endif
1587 default:
1588 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1589 return 1;
1590 }
1591 *pdata = data;
1592 return 0;
1593 }
1594 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1595
1596 /*
1597 * Reads an msr value (of 'msr_index') into 'pdata'.
1598 * Returns 0 on success, non-0 otherwise.
1599 * Assumes vcpu_load() was already called.
1600 */
1601 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1602 {
1603 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1604 }
1605
1606 #ifdef CONFIG_X86_64
1607
1608 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1609 {
1610 if (efer & EFER_RESERVED_BITS) {
1611 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1612 efer);
1613 inject_gp(vcpu);
1614 return;
1615 }
1616
1617 if (is_paging(vcpu)
1618 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1619 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1620 inject_gp(vcpu);
1621 return;
1622 }
1623
1624 kvm_x86_ops->set_efer(vcpu, efer);
1625
1626 efer &= ~EFER_LMA;
1627 efer |= vcpu->shadow_efer & EFER_LMA;
1628
1629 vcpu->shadow_efer = efer;
1630 }
1631
1632 #endif
1633
1634 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1635 {
1636 switch (msr) {
1637 #ifdef CONFIG_X86_64
1638 case MSR_EFER:
1639 set_efer(vcpu, data);
1640 break;
1641 #endif
1642 case MSR_IA32_MC0_STATUS:
1643 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1644 __FUNCTION__, data);
1645 break;
1646 case MSR_IA32_MCG_STATUS:
1647 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1648 __FUNCTION__, data);
1649 break;
1650 case MSR_IA32_UCODE_REV:
1651 case MSR_IA32_UCODE_WRITE:
1652 case 0x200 ... 0x2ff: /* MTRRs */
1653 break;
1654 case MSR_IA32_APICBASE:
1655 kvm_set_apic_base(vcpu, data);
1656 break;
1657 case MSR_IA32_MISC_ENABLE:
1658 vcpu->ia32_misc_enable_msr = data;
1659 break;
1660 /*
1661 * This is the 'probe whether the host is KVM' logic:
1662 */
1663 case MSR_KVM_API_MAGIC:
1664 return vcpu_register_para(vcpu, data);
1665
1666 default:
1667 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
1668 return 1;
1669 }
1670 return 0;
1671 }
1672 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1673
1674 /*
1675 * Writes msr value into into the appropriate "register".
1676 * Returns 0 on success, non-0 otherwise.
1677 * Assumes vcpu_load() was already called.
1678 */
1679 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1680 {
1681 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
1682 }
1683
1684 void kvm_resched(struct kvm_vcpu *vcpu)
1685 {
1686 if (!need_resched())
1687 return;
1688 cond_resched();
1689 }
1690 EXPORT_SYMBOL_GPL(kvm_resched);
1691
1692 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1693 {
1694 int i;
1695 u32 function;
1696 struct kvm_cpuid_entry *e, *best;
1697
1698 kvm_x86_ops->cache_regs(vcpu);
1699 function = vcpu->regs[VCPU_REGS_RAX];
1700 vcpu->regs[VCPU_REGS_RAX] = 0;
1701 vcpu->regs[VCPU_REGS_RBX] = 0;
1702 vcpu->regs[VCPU_REGS_RCX] = 0;
1703 vcpu->regs[VCPU_REGS_RDX] = 0;
1704 best = NULL;
1705 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1706 e = &vcpu->cpuid_entries[i];
1707 if (e->function == function) {
1708 best = e;
1709 break;
1710 }
1711 /*
1712 * Both basic or both extended?
1713 */
1714 if (((e->function ^ function) & 0x80000000) == 0)
1715 if (!best || e->function > best->function)
1716 best = e;
1717 }
1718 if (best) {
1719 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1720 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1721 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1722 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1723 }
1724 kvm_x86_ops->decache_regs(vcpu);
1725 kvm_x86_ops->skip_emulated_instruction(vcpu);
1726 }
1727 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1728
1729 static int pio_copy_data(struct kvm_vcpu *vcpu)
1730 {
1731 void *p = vcpu->pio_data;
1732 void *q;
1733 unsigned bytes;
1734 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1735
1736 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1737 PAGE_KERNEL);
1738 if (!q) {
1739 free_pio_guest_pages(vcpu);
1740 return -ENOMEM;
1741 }
1742 q += vcpu->pio.guest_page_offset;
1743 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1744 if (vcpu->pio.in)
1745 memcpy(q, p, bytes);
1746 else
1747 memcpy(p, q, bytes);
1748 q -= vcpu->pio.guest_page_offset;
1749 vunmap(q);
1750 free_pio_guest_pages(vcpu);
1751 return 0;
1752 }
1753
1754 static int complete_pio(struct kvm_vcpu *vcpu)
1755 {
1756 struct kvm_pio_request *io = &vcpu->pio;
1757 long delta;
1758 int r;
1759
1760 kvm_x86_ops->cache_regs(vcpu);
1761
1762 if (!io->string) {
1763 if (io->in)
1764 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1765 io->size);
1766 } else {
1767 if (io->in) {
1768 r = pio_copy_data(vcpu);
1769 if (r) {
1770 kvm_x86_ops->cache_regs(vcpu);
1771 return r;
1772 }
1773 }
1774
1775 delta = 1;
1776 if (io->rep) {
1777 delta *= io->cur_count;
1778 /*
1779 * The size of the register should really depend on
1780 * current address size.
1781 */
1782 vcpu->regs[VCPU_REGS_RCX] -= delta;
1783 }
1784 if (io->down)
1785 delta = -delta;
1786 delta *= io->size;
1787 if (io->in)
1788 vcpu->regs[VCPU_REGS_RDI] += delta;
1789 else
1790 vcpu->regs[VCPU_REGS_RSI] += delta;
1791 }
1792
1793 kvm_x86_ops->decache_regs(vcpu);
1794
1795 io->count -= io->cur_count;
1796 io->cur_count = 0;
1797
1798 return 0;
1799 }
1800
1801 static void kernel_pio(struct kvm_io_device *pio_dev,
1802 struct kvm_vcpu *vcpu,
1803 void *pd)
1804 {
1805 /* TODO: String I/O for in kernel device */
1806
1807 mutex_lock(&vcpu->kvm->lock);
1808 if (vcpu->pio.in)
1809 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1810 vcpu->pio.size,
1811 pd);
1812 else
1813 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1814 vcpu->pio.size,
1815 pd);
1816 mutex_unlock(&vcpu->kvm->lock);
1817 }
1818
1819 static void pio_string_write(struct kvm_io_device *pio_dev,
1820 struct kvm_vcpu *vcpu)
1821 {
1822 struct kvm_pio_request *io = &vcpu->pio;
1823 void *pd = vcpu->pio_data;
1824 int i;
1825
1826 mutex_lock(&vcpu->kvm->lock);
1827 for (i = 0; i < io->cur_count; i++) {
1828 kvm_iodevice_write(pio_dev, io->port,
1829 io->size,
1830 pd);
1831 pd += io->size;
1832 }
1833 mutex_unlock(&vcpu->kvm->lock);
1834 }
1835
1836 int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1837 int size, unsigned port)
1838 {
1839 struct kvm_io_device *pio_dev;
1840
1841 vcpu->run->exit_reason = KVM_EXIT_IO;
1842 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1843 vcpu->run->io.size = vcpu->pio.size = size;
1844 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1845 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
1846 vcpu->run->io.port = vcpu->pio.port = port;
1847 vcpu->pio.in = in;
1848 vcpu->pio.string = 0;
1849 vcpu->pio.down = 0;
1850 vcpu->pio.guest_page_offset = 0;
1851 vcpu->pio.rep = 0;
1852
1853 kvm_x86_ops->cache_regs(vcpu);
1854 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1855 kvm_x86_ops->decache_regs(vcpu);
1856
1857 kvm_x86_ops->skip_emulated_instruction(vcpu);
1858
1859 pio_dev = vcpu_find_pio_dev(vcpu, port);
1860 if (pio_dev) {
1861 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1862 complete_pio(vcpu);
1863 return 1;
1864 }
1865 return 0;
1866 }
1867 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
1868
1869 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1870 int size, unsigned long count, int down,
1871 gva_t address, int rep, unsigned port)
1872 {
1873 unsigned now, in_page;
1874 int i, ret = 0;
1875 int nr_pages = 1;
1876 struct page *page;
1877 struct kvm_io_device *pio_dev;
1878
1879 vcpu->run->exit_reason = KVM_EXIT_IO;
1880 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1881 vcpu->run->io.size = vcpu->pio.size = size;
1882 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1883 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
1884 vcpu->run->io.port = vcpu->pio.port = port;
1885 vcpu->pio.in = in;
1886 vcpu->pio.string = 1;
1887 vcpu->pio.down = down;
1888 vcpu->pio.guest_page_offset = offset_in_page(address);
1889 vcpu->pio.rep = rep;
1890
1891 if (!count) {
1892 kvm_x86_ops->skip_emulated_instruction(vcpu);
1893 return 1;
1894 }
1895
1896 if (!down)
1897 in_page = PAGE_SIZE - offset_in_page(address);
1898 else
1899 in_page = offset_in_page(address) + size;
1900 now = min(count, (unsigned long)in_page / size);
1901 if (!now) {
1902 /*
1903 * String I/O straddles page boundary. Pin two guest pages
1904 * so that we satisfy atomicity constraints. Do just one
1905 * transaction to avoid complexity.
1906 */
1907 nr_pages = 2;
1908 now = 1;
1909 }
1910 if (down) {
1911 /*
1912 * String I/O in reverse. Yuck. Kill the guest, fix later.
1913 */
1914 pr_unimpl(vcpu, "guest string pio down\n");
1915 inject_gp(vcpu);
1916 return 1;
1917 }
1918 vcpu->run->io.count = now;
1919 vcpu->pio.cur_count = now;
1920
1921 if (vcpu->pio.cur_count == vcpu->pio.count)
1922 kvm_x86_ops->skip_emulated_instruction(vcpu);
1923
1924 for (i = 0; i < nr_pages; ++i) {
1925 mutex_lock(&vcpu->kvm->lock);
1926 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1927 if (page)
1928 get_page(page);
1929 vcpu->pio.guest_pages[i] = page;
1930 mutex_unlock(&vcpu->kvm->lock);
1931 if (!page) {
1932 inject_gp(vcpu);
1933 free_pio_guest_pages(vcpu);
1934 return 1;
1935 }
1936 }
1937
1938 pio_dev = vcpu_find_pio_dev(vcpu, port);
1939 if (!vcpu->pio.in) {
1940 /* string PIO write */
1941 ret = pio_copy_data(vcpu);
1942 if (ret >= 0 && pio_dev) {
1943 pio_string_write(pio_dev, vcpu);
1944 complete_pio(vcpu);
1945 if (vcpu->pio.count == 0)
1946 ret = 1;
1947 }
1948 } else if (pio_dev)
1949 pr_unimpl(vcpu, "no string pio read support yet, "
1950 "port %x size %d count %ld\n",
1951 port, size, count);
1952
1953 return ret;
1954 }
1955 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
1956
1957 /*
1958 * Check if userspace requested an interrupt window, and that the
1959 * interrupt window is open.
1960 *
1961 * No need to exit to userspace if we already have an interrupt queued.
1962 */
1963 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
1964 struct kvm_run *kvm_run)
1965 {
1966 return (!vcpu->irq_summary &&
1967 kvm_run->request_interrupt_window &&
1968 vcpu->interrupt_window_open &&
1969 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
1970 }
1971
1972 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
1973 struct kvm_run *kvm_run)
1974 {
1975 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
1976 kvm_run->cr8 = get_cr8(vcpu);
1977 kvm_run->apic_base = kvm_get_apic_base(vcpu);
1978 if (irqchip_in_kernel(vcpu->kvm))
1979 kvm_run->ready_for_interrupt_injection = 1;
1980 else
1981 kvm_run->ready_for_interrupt_injection =
1982 (vcpu->interrupt_window_open &&
1983 vcpu->irq_summary == 0);
1984 }
1985
1986 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1987 {
1988 int r;
1989
1990 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
1991 printk("vcpu %d received sipi with vector # %x\n",
1992 vcpu->vcpu_id, vcpu->sipi_vector);
1993 kvm_lapic_reset(vcpu);
1994 kvm_x86_ops->vcpu_reset(vcpu);
1995 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
1996 }
1997
1998 preempted:
1999 if (vcpu->guest_debug.enabled)
2000 kvm_x86_ops->guest_debug_pre(vcpu);
2001
2002 again:
2003 r = kvm_mmu_reload(vcpu);
2004 if (unlikely(r))
2005 goto out;
2006
2007 preempt_disable();
2008
2009 kvm_x86_ops->prepare_guest_switch(vcpu);
2010 kvm_load_guest_fpu(vcpu);
2011
2012 local_irq_disable();
2013
2014 if (signal_pending(current)) {
2015 local_irq_enable();
2016 preempt_enable();
2017 r = -EINTR;
2018 kvm_run->exit_reason = KVM_EXIT_INTR;
2019 ++vcpu->stat.signal_exits;
2020 goto out;
2021 }
2022
2023 if (irqchip_in_kernel(vcpu->kvm))
2024 kvm_x86_ops->inject_pending_irq(vcpu);
2025 else if (!vcpu->mmio_read_completed)
2026 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
2027
2028 vcpu->guest_mode = 1;
2029 kvm_guest_enter();
2030
2031 if (vcpu->requests)
2032 if (test_and_clear_bit(KVM_TLB_FLUSH, &vcpu->requests))
2033 kvm_x86_ops->tlb_flush(vcpu);
2034
2035 kvm_x86_ops->run(vcpu, kvm_run);
2036
2037 vcpu->guest_mode = 0;
2038 local_irq_enable();
2039
2040 ++vcpu->stat.exits;
2041
2042 /*
2043 * We must have an instruction between local_irq_enable() and
2044 * kvm_guest_exit(), so the timer interrupt isn't delayed by
2045 * the interrupt shadow. The stat.exits increment will do nicely.
2046 * But we need to prevent reordering, hence this barrier():
2047 */
2048 barrier();
2049
2050 kvm_guest_exit();
2051
2052 preempt_enable();
2053
2054 /*
2055 * Profile KVM exit RIPs:
2056 */
2057 if (unlikely(prof_on == KVM_PROFILING)) {
2058 kvm_x86_ops->cache_regs(vcpu);
2059 profile_hit(KVM_PROFILING, (void *)vcpu->rip);
2060 }
2061
2062 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2063
2064 if (r > 0) {
2065 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2066 r = -EINTR;
2067 kvm_run->exit_reason = KVM_EXIT_INTR;
2068 ++vcpu->stat.request_irq_exits;
2069 goto out;
2070 }
2071 if (!need_resched()) {
2072 ++vcpu->stat.light_exits;
2073 goto again;
2074 }
2075 }
2076
2077 out:
2078 if (r > 0) {
2079 kvm_resched(vcpu);
2080 goto preempted;
2081 }
2082
2083 post_kvm_run_save(vcpu, kvm_run);
2084
2085 return r;
2086 }
2087
2088
2089 static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2090 {
2091 int r;
2092 sigset_t sigsaved;
2093
2094 vcpu_load(vcpu);
2095
2096 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
2097 kvm_vcpu_block(vcpu);
2098 vcpu_put(vcpu);
2099 return -EAGAIN;
2100 }
2101
2102 if (vcpu->sigset_active)
2103 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2104
2105 /* re-sync apic's tpr */
2106 if (!irqchip_in_kernel(vcpu->kvm))
2107 set_cr8(vcpu, kvm_run->cr8);
2108
2109 if (vcpu->pio.cur_count) {
2110 r = complete_pio(vcpu);
2111 if (r)
2112 goto out;
2113 }
2114
2115 if (vcpu->mmio_needed) {
2116 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2117 vcpu->mmio_read_completed = 1;
2118 vcpu->mmio_needed = 0;
2119 r = emulate_instruction(vcpu, kvm_run,
2120 vcpu->mmio_fault_cr2, 0);
2121 if (r == EMULATE_DO_MMIO) {
2122 /*
2123 * Read-modify-write. Back to userspace.
2124 */
2125 r = 0;
2126 goto out;
2127 }
2128 }
2129
2130 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2131 kvm_x86_ops->cache_regs(vcpu);
2132 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2133 kvm_x86_ops->decache_regs(vcpu);
2134 }
2135
2136 r = __vcpu_run(vcpu, kvm_run);
2137
2138 out:
2139 if (vcpu->sigset_active)
2140 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2141
2142 vcpu_put(vcpu);
2143 return r;
2144 }
2145
2146 static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
2147 struct kvm_regs *regs)
2148 {
2149 vcpu_load(vcpu);
2150
2151 kvm_x86_ops->cache_regs(vcpu);
2152
2153 regs->rax = vcpu->regs[VCPU_REGS_RAX];
2154 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
2155 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
2156 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
2157 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
2158 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
2159 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
2160 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
2161 #ifdef CONFIG_X86_64
2162 regs->r8 = vcpu->regs[VCPU_REGS_R8];
2163 regs->r9 = vcpu->regs[VCPU_REGS_R9];
2164 regs->r10 = vcpu->regs[VCPU_REGS_R10];
2165 regs->r11 = vcpu->regs[VCPU_REGS_R11];
2166 regs->r12 = vcpu->regs[VCPU_REGS_R12];
2167 regs->r13 = vcpu->regs[VCPU_REGS_R13];
2168 regs->r14 = vcpu->regs[VCPU_REGS_R14];
2169 regs->r15 = vcpu->regs[VCPU_REGS_R15];
2170 #endif
2171
2172 regs->rip = vcpu->rip;
2173 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2174
2175 /*
2176 * Don't leak debug flags in case they were set for guest debugging
2177 */
2178 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2179 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2180
2181 vcpu_put(vcpu);
2182
2183 return 0;
2184 }
2185
2186 static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
2187 struct kvm_regs *regs)
2188 {
2189 vcpu_load(vcpu);
2190
2191 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2192 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2193 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2194 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2195 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2196 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2197 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2198 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
2199 #ifdef CONFIG_X86_64
2200 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2201 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2202 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2203 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2204 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2205 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2206 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2207 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2208 #endif
2209
2210 vcpu->rip = regs->rip;
2211 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
2212
2213 kvm_x86_ops->decache_regs(vcpu);
2214
2215 vcpu_put(vcpu);
2216
2217 return 0;
2218 }
2219
2220 static void get_segment(struct kvm_vcpu *vcpu,
2221 struct kvm_segment *var, int seg)
2222 {
2223 return kvm_x86_ops->get_segment(vcpu, var, seg);
2224 }
2225
2226 static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2227 struct kvm_sregs *sregs)
2228 {
2229 struct descriptor_table dt;
2230 int pending_vec;
2231
2232 vcpu_load(vcpu);
2233
2234 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2235 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2236 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2237 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2238 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2239 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2240
2241 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2242 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2243
2244 kvm_x86_ops->get_idt(vcpu, &dt);
2245 sregs->idt.limit = dt.limit;
2246 sregs->idt.base = dt.base;
2247 kvm_x86_ops->get_gdt(vcpu, &dt);
2248 sregs->gdt.limit = dt.limit;
2249 sregs->gdt.base = dt.base;
2250
2251 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2252 sregs->cr0 = vcpu->cr0;
2253 sregs->cr2 = vcpu->cr2;
2254 sregs->cr3 = vcpu->cr3;
2255 sregs->cr4 = vcpu->cr4;
2256 sregs->cr8 = get_cr8(vcpu);
2257 sregs->efer = vcpu->shadow_efer;
2258 sregs->apic_base = kvm_get_apic_base(vcpu);
2259
2260 if (irqchip_in_kernel(vcpu->kvm)) {
2261 memset(sregs->interrupt_bitmap, 0,
2262 sizeof sregs->interrupt_bitmap);
2263 pending_vec = kvm_x86_ops->get_irq(vcpu);
2264 if (pending_vec >= 0)
2265 set_bit(pending_vec, (unsigned long *)sregs->interrupt_bitmap);
2266 } else
2267 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2268 sizeof sregs->interrupt_bitmap);
2269
2270 vcpu_put(vcpu);
2271
2272 return 0;
2273 }
2274
2275 static void set_segment(struct kvm_vcpu *vcpu,
2276 struct kvm_segment *var, int seg)
2277 {
2278 return kvm_x86_ops->set_segment(vcpu, var, seg);
2279 }
2280
2281 static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2282 struct kvm_sregs *sregs)
2283 {
2284 int mmu_reset_needed = 0;
2285 int i, pending_vec, max_bits;
2286 struct descriptor_table dt;
2287
2288 vcpu_load(vcpu);
2289
2290 dt.limit = sregs->idt.limit;
2291 dt.base = sregs->idt.base;
2292 kvm_x86_ops->set_idt(vcpu, &dt);
2293 dt.limit = sregs->gdt.limit;
2294 dt.base = sregs->gdt.base;
2295 kvm_x86_ops->set_gdt(vcpu, &dt);
2296
2297 vcpu->cr2 = sregs->cr2;
2298 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2299 vcpu->cr3 = sregs->cr3;
2300
2301 set_cr8(vcpu, sregs->cr8);
2302
2303 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2304 #ifdef CONFIG_X86_64
2305 kvm_x86_ops->set_efer(vcpu, sregs->efer);
2306 #endif
2307 kvm_set_apic_base(vcpu, sregs->apic_base);
2308
2309 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2310
2311 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2312 vcpu->cr0 = sregs->cr0;
2313 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
2314
2315 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2316 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
2317 if (!is_long_mode(vcpu) && is_pae(vcpu))
2318 load_pdptrs(vcpu, vcpu->cr3);
2319
2320 if (mmu_reset_needed)
2321 kvm_mmu_reset_context(vcpu);
2322
2323 if (!irqchip_in_kernel(vcpu->kvm)) {
2324 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2325 sizeof vcpu->irq_pending);
2326 vcpu->irq_summary = 0;
2327 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2328 if (vcpu->irq_pending[i])
2329 __set_bit(i, &vcpu->irq_summary);
2330 } else {
2331 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2332 pending_vec = find_first_bit(
2333 (const unsigned long *)sregs->interrupt_bitmap,
2334 max_bits);
2335 /* Only pending external irq is handled here */
2336 if (pending_vec < max_bits) {
2337 kvm_x86_ops->set_irq(vcpu, pending_vec);
2338 printk("Set back pending irq %d\n", pending_vec);
2339 }
2340 }
2341
2342 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2343 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2344 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2345 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2346 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2347 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2348
2349 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2350 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2351
2352 vcpu_put(vcpu);
2353
2354 return 0;
2355 }
2356
2357 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2358 {
2359 struct kvm_segment cs;
2360
2361 get_segment(vcpu, &cs, VCPU_SREG_CS);
2362 *db = cs.db;
2363 *l = cs.l;
2364 }
2365 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
2366
2367 /*
2368 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2369 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
2370 *
2371 * This list is modified at module load time to reflect the
2372 * capabilities of the host cpu.
2373 */
2374 static u32 msrs_to_save[] = {
2375 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2376 MSR_K6_STAR,
2377 #ifdef CONFIG_X86_64
2378 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2379 #endif
2380 MSR_IA32_TIME_STAMP_COUNTER,
2381 };
2382
2383 static unsigned num_msrs_to_save;
2384
2385 static u32 emulated_msrs[] = {
2386 MSR_IA32_MISC_ENABLE,
2387 };
2388
2389 static __init void kvm_init_msr_list(void)
2390 {
2391 u32 dummy[2];
2392 unsigned i, j;
2393
2394 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2395 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2396 continue;
2397 if (j < i)
2398 msrs_to_save[j] = msrs_to_save[i];
2399 j++;
2400 }
2401 num_msrs_to_save = j;
2402 }
2403
2404 /*
2405 * Adapt set_msr() to msr_io()'s calling convention
2406 */
2407 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2408 {
2409 return kvm_set_msr(vcpu, index, *data);
2410 }
2411
2412 /*
2413 * Read or write a bunch of msrs. All parameters are kernel addresses.
2414 *
2415 * @return number of msrs set successfully.
2416 */
2417 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2418 struct kvm_msr_entry *entries,
2419 int (*do_msr)(struct kvm_vcpu *vcpu,
2420 unsigned index, u64 *data))
2421 {
2422 int i;
2423
2424 vcpu_load(vcpu);
2425
2426 for (i = 0; i < msrs->nmsrs; ++i)
2427 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2428 break;
2429
2430 vcpu_put(vcpu);
2431
2432 return i;
2433 }
2434
2435 /*
2436 * Read or write a bunch of msrs. Parameters are user addresses.
2437 *
2438 * @return number of msrs set successfully.
2439 */
2440 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2441 int (*do_msr)(struct kvm_vcpu *vcpu,
2442 unsigned index, u64 *data),
2443 int writeback)
2444 {
2445 struct kvm_msrs msrs;
2446 struct kvm_msr_entry *entries;
2447 int r, n;
2448 unsigned size;
2449
2450 r = -EFAULT;
2451 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2452 goto out;
2453
2454 r = -E2BIG;
2455 if (msrs.nmsrs >= MAX_IO_MSRS)
2456 goto out;
2457
2458 r = -ENOMEM;
2459 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2460 entries = vmalloc(size);
2461 if (!entries)
2462 goto out;
2463
2464 r = -EFAULT;
2465 if (copy_from_user(entries, user_msrs->entries, size))
2466 goto out_free;
2467
2468 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2469 if (r < 0)
2470 goto out_free;
2471
2472 r = -EFAULT;
2473 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2474 goto out_free;
2475
2476 r = n;
2477
2478 out_free:
2479 vfree(entries);
2480 out:
2481 return r;
2482 }
2483
2484 /*
2485 * Translate a guest virtual address to a guest physical address.
2486 */
2487 static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2488 struct kvm_translation *tr)
2489 {
2490 unsigned long vaddr = tr->linear_address;
2491 gpa_t gpa;
2492
2493 vcpu_load(vcpu);
2494 mutex_lock(&vcpu->kvm->lock);
2495 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2496 tr->physical_address = gpa;
2497 tr->valid = gpa != UNMAPPED_GVA;
2498 tr->writeable = 1;
2499 tr->usermode = 0;
2500 mutex_unlock(&vcpu->kvm->lock);
2501 vcpu_put(vcpu);
2502
2503 return 0;
2504 }
2505
2506 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2507 struct kvm_interrupt *irq)
2508 {
2509 if (irq->irq < 0 || irq->irq >= 256)
2510 return -EINVAL;
2511 if (irqchip_in_kernel(vcpu->kvm))
2512 return -ENXIO;
2513 vcpu_load(vcpu);
2514
2515 set_bit(irq->irq, vcpu->irq_pending);
2516 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2517
2518 vcpu_put(vcpu);
2519
2520 return 0;
2521 }
2522
2523 static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2524 struct kvm_debug_guest *dbg)
2525 {
2526 int r;
2527
2528 vcpu_load(vcpu);
2529
2530 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
2531
2532 vcpu_put(vcpu);
2533
2534 return r;
2535 }
2536
2537 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2538 unsigned long address,
2539 int *type)
2540 {
2541 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2542 unsigned long pgoff;
2543 struct page *page;
2544
2545 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2546 if (pgoff == 0)
2547 page = virt_to_page(vcpu->run);
2548 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2549 page = virt_to_page(vcpu->pio_data);
2550 else
2551 return NOPAGE_SIGBUS;
2552 get_page(page);
2553 if (type != NULL)
2554 *type = VM_FAULT_MINOR;
2555
2556 return page;
2557 }
2558
2559 static struct vm_operations_struct kvm_vcpu_vm_ops = {
2560 .nopage = kvm_vcpu_nopage,
2561 };
2562
2563 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2564 {
2565 vma->vm_ops = &kvm_vcpu_vm_ops;
2566 return 0;
2567 }
2568
2569 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2570 {
2571 struct kvm_vcpu *vcpu = filp->private_data;
2572
2573 fput(vcpu->kvm->filp);
2574 return 0;
2575 }
2576
2577 static struct file_operations kvm_vcpu_fops = {
2578 .release = kvm_vcpu_release,
2579 .unlocked_ioctl = kvm_vcpu_ioctl,
2580 .compat_ioctl = kvm_vcpu_ioctl,
2581 .mmap = kvm_vcpu_mmap,
2582 };
2583
2584 /*
2585 * Allocates an inode for the vcpu.
2586 */
2587 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2588 {
2589 int fd, r;
2590 struct inode *inode;
2591 struct file *file;
2592
2593 r = anon_inode_getfd(&fd, &inode, &file,
2594 "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2595 if (r)
2596 return r;
2597 atomic_inc(&vcpu->kvm->filp->f_count);
2598 return fd;
2599 }
2600
2601 /*
2602 * Creates some virtual cpus. Good luck creating more than one.
2603 */
2604 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2605 {
2606 int r;
2607 struct kvm_vcpu *vcpu;
2608
2609 if (!valid_vcpu(n))
2610 return -EINVAL;
2611
2612 vcpu = kvm_x86_ops->vcpu_create(kvm, n);
2613 if (IS_ERR(vcpu))
2614 return PTR_ERR(vcpu);
2615
2616 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2617
2618 /* We do fxsave: this must be aligned. */
2619 BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2620
2621 vcpu_load(vcpu);
2622 r = kvm_mmu_setup(vcpu);
2623 vcpu_put(vcpu);
2624 if (r < 0)
2625 goto free_vcpu;
2626
2627 mutex_lock(&kvm->lock);
2628 if (kvm->vcpus[n]) {
2629 r = -EEXIST;
2630 mutex_unlock(&kvm->lock);
2631 goto mmu_unload;
2632 }
2633 kvm->vcpus[n] = vcpu;
2634 mutex_unlock(&kvm->lock);
2635
2636 /* Now it's all set up, let userspace reach it */
2637 r = create_vcpu_fd(vcpu);
2638 if (r < 0)
2639 goto unlink;
2640 return r;
2641
2642 unlink:
2643 mutex_lock(&kvm->lock);
2644 kvm->vcpus[n] = NULL;
2645 mutex_unlock(&kvm->lock);
2646
2647 mmu_unload:
2648 vcpu_load(vcpu);
2649 kvm_mmu_unload(vcpu);
2650 vcpu_put(vcpu);
2651
2652 free_vcpu:
2653 kvm_x86_ops->vcpu_free(vcpu);
2654 return r;
2655 }
2656
2657 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2658 {
2659 u64 efer;
2660 int i;
2661 struct kvm_cpuid_entry *e, *entry;
2662
2663 rdmsrl(MSR_EFER, efer);
2664 entry = NULL;
2665 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2666 e = &vcpu->cpuid_entries[i];
2667 if (e->function == 0x80000001) {
2668 entry = e;
2669 break;
2670 }
2671 }
2672 if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
2673 entry->edx &= ~(1 << 20);
2674 printk(KERN_INFO "kvm: guest NX capability removed\n");
2675 }
2676 }
2677
2678 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2679 struct kvm_cpuid *cpuid,
2680 struct kvm_cpuid_entry __user *entries)
2681 {
2682 int r;
2683
2684 r = -E2BIG;
2685 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2686 goto out;
2687 r = -EFAULT;
2688 if (copy_from_user(&vcpu->cpuid_entries, entries,
2689 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2690 goto out;
2691 vcpu->cpuid_nent = cpuid->nent;
2692 cpuid_fix_nx_cap(vcpu);
2693 return 0;
2694
2695 out:
2696 return r;
2697 }
2698
2699 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2700 {
2701 if (sigset) {
2702 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2703 vcpu->sigset_active = 1;
2704 vcpu->sigset = *sigset;
2705 } else
2706 vcpu->sigset_active = 0;
2707 return 0;
2708 }
2709
2710 /*
2711 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2712 * we have asm/x86/processor.h
2713 */
2714 struct fxsave {
2715 u16 cwd;
2716 u16 swd;
2717 u16 twd;
2718 u16 fop;
2719 u64 rip;
2720 u64 rdp;
2721 u32 mxcsr;
2722 u32 mxcsr_mask;
2723 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2724 #ifdef CONFIG_X86_64
2725 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2726 #else
2727 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2728 #endif
2729 };
2730
2731 static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2732 {
2733 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2734
2735 vcpu_load(vcpu);
2736
2737 memcpy(fpu->fpr, fxsave->st_space, 128);
2738 fpu->fcw = fxsave->cwd;
2739 fpu->fsw = fxsave->swd;
2740 fpu->ftwx = fxsave->twd;
2741 fpu->last_opcode = fxsave->fop;
2742 fpu->last_ip = fxsave->rip;
2743 fpu->last_dp = fxsave->rdp;
2744 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2745
2746 vcpu_put(vcpu);
2747
2748 return 0;
2749 }
2750
2751 static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2752 {
2753 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2754
2755 vcpu_load(vcpu);
2756
2757 memcpy(fxsave->st_space, fpu->fpr, 128);
2758 fxsave->cwd = fpu->fcw;
2759 fxsave->swd = fpu->fsw;
2760 fxsave->twd = fpu->ftwx;
2761 fxsave->fop = fpu->last_opcode;
2762 fxsave->rip = fpu->last_ip;
2763 fxsave->rdp = fpu->last_dp;
2764 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2765
2766 vcpu_put(vcpu);
2767
2768 return 0;
2769 }
2770
2771 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2772 struct kvm_lapic_state *s)
2773 {
2774 vcpu_load(vcpu);
2775 memcpy(s->regs, vcpu->apic->regs, sizeof *s);
2776 vcpu_put(vcpu);
2777
2778 return 0;
2779 }
2780
2781 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2782 struct kvm_lapic_state *s)
2783 {
2784 vcpu_load(vcpu);
2785 memcpy(vcpu->apic->regs, s->regs, sizeof *s);
2786 kvm_apic_post_state_restore(vcpu);
2787 vcpu_put(vcpu);
2788
2789 return 0;
2790 }
2791
2792 static long kvm_vcpu_ioctl(struct file *filp,
2793 unsigned int ioctl, unsigned long arg)
2794 {
2795 struct kvm_vcpu *vcpu = filp->private_data;
2796 void __user *argp = (void __user *)arg;
2797 int r = -EINVAL;
2798
2799 switch (ioctl) {
2800 case KVM_RUN:
2801 r = -EINVAL;
2802 if (arg)
2803 goto out;
2804 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
2805 break;
2806 case KVM_GET_REGS: {
2807 struct kvm_regs kvm_regs;
2808
2809 memset(&kvm_regs, 0, sizeof kvm_regs);
2810 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
2811 if (r)
2812 goto out;
2813 r = -EFAULT;
2814 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
2815 goto out;
2816 r = 0;
2817 break;
2818 }
2819 case KVM_SET_REGS: {
2820 struct kvm_regs kvm_regs;
2821
2822 r = -EFAULT;
2823 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
2824 goto out;
2825 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
2826 if (r)
2827 goto out;
2828 r = 0;
2829 break;
2830 }
2831 case KVM_GET_SREGS: {
2832 struct kvm_sregs kvm_sregs;
2833
2834 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2835 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
2836 if (r)
2837 goto out;
2838 r = -EFAULT;
2839 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
2840 goto out;
2841 r = 0;
2842 break;
2843 }
2844 case KVM_SET_SREGS: {
2845 struct kvm_sregs kvm_sregs;
2846
2847 r = -EFAULT;
2848 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
2849 goto out;
2850 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
2851 if (r)
2852 goto out;
2853 r = 0;
2854 break;
2855 }
2856 case KVM_TRANSLATE: {
2857 struct kvm_translation tr;
2858
2859 r = -EFAULT;
2860 if (copy_from_user(&tr, argp, sizeof tr))
2861 goto out;
2862 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
2863 if (r)
2864 goto out;
2865 r = -EFAULT;
2866 if (copy_to_user(argp, &tr, sizeof tr))
2867 goto out;
2868 r = 0;
2869 break;
2870 }
2871 case KVM_INTERRUPT: {
2872 struct kvm_interrupt irq;
2873
2874 r = -EFAULT;
2875 if (copy_from_user(&irq, argp, sizeof irq))
2876 goto out;
2877 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2878 if (r)
2879 goto out;
2880 r = 0;
2881 break;
2882 }
2883 case KVM_DEBUG_GUEST: {
2884 struct kvm_debug_guest dbg;
2885
2886 r = -EFAULT;
2887 if (copy_from_user(&dbg, argp, sizeof dbg))
2888 goto out;
2889 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
2890 if (r)
2891 goto out;
2892 r = 0;
2893 break;
2894 }
2895 case KVM_GET_MSRS:
2896 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2897 break;
2898 case KVM_SET_MSRS:
2899 r = msr_io(vcpu, argp, do_set_msr, 0);
2900 break;
2901 case KVM_SET_CPUID: {
2902 struct kvm_cpuid __user *cpuid_arg = argp;
2903 struct kvm_cpuid cpuid;
2904
2905 r = -EFAULT;
2906 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2907 goto out;
2908 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2909 if (r)
2910 goto out;
2911 break;
2912 }
2913 case KVM_SET_SIGNAL_MASK: {
2914 struct kvm_signal_mask __user *sigmask_arg = argp;
2915 struct kvm_signal_mask kvm_sigmask;
2916 sigset_t sigset, *p;
2917
2918 p = NULL;
2919 if (argp) {
2920 r = -EFAULT;
2921 if (copy_from_user(&kvm_sigmask, argp,
2922 sizeof kvm_sigmask))
2923 goto out;
2924 r = -EINVAL;
2925 if (kvm_sigmask.len != sizeof sigset)
2926 goto out;
2927 r = -EFAULT;
2928 if (copy_from_user(&sigset, sigmask_arg->sigset,
2929 sizeof sigset))
2930 goto out;
2931 p = &sigset;
2932 }
2933 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2934 break;
2935 }
2936 case KVM_GET_FPU: {
2937 struct kvm_fpu fpu;
2938
2939 memset(&fpu, 0, sizeof fpu);
2940 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2941 if (r)
2942 goto out;
2943 r = -EFAULT;
2944 if (copy_to_user(argp, &fpu, sizeof fpu))
2945 goto out;
2946 r = 0;
2947 break;
2948 }
2949 case KVM_SET_FPU: {
2950 struct kvm_fpu fpu;
2951
2952 r = -EFAULT;
2953 if (copy_from_user(&fpu, argp, sizeof fpu))
2954 goto out;
2955 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2956 if (r)
2957 goto out;
2958 r = 0;
2959 break;
2960 }
2961 case KVM_GET_LAPIC: {
2962 struct kvm_lapic_state lapic;
2963
2964 memset(&lapic, 0, sizeof lapic);
2965 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
2966 if (r)
2967 goto out;
2968 r = -EFAULT;
2969 if (copy_to_user(argp, &lapic, sizeof lapic))
2970 goto out;
2971 r = 0;
2972 break;
2973 }
2974 case KVM_SET_LAPIC: {
2975 struct kvm_lapic_state lapic;
2976
2977 r = -EFAULT;
2978 if (copy_from_user(&lapic, argp, sizeof lapic))
2979 goto out;
2980 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
2981 if (r)
2982 goto out;
2983 r = 0;
2984 break;
2985 }
2986 default:
2987 ;
2988 }
2989 out:
2990 return r;
2991 }
2992
2993 static long kvm_vm_ioctl(struct file *filp,
2994 unsigned int ioctl, unsigned long arg)
2995 {
2996 struct kvm *kvm = filp->private_data;
2997 void __user *argp = (void __user *)arg;
2998 int r = -EINVAL;
2999
3000 switch (ioctl) {
3001 case KVM_CREATE_VCPU:
3002 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
3003 if (r < 0)
3004 goto out;
3005 break;
3006 case KVM_SET_MEMORY_REGION: {
3007 struct kvm_memory_region kvm_mem;
3008
3009 r = -EFAULT;
3010 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
3011 goto out;
3012 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
3013 if (r)
3014 goto out;
3015 break;
3016 }
3017 case KVM_GET_DIRTY_LOG: {
3018 struct kvm_dirty_log log;
3019
3020 r = -EFAULT;
3021 if (copy_from_user(&log, argp, sizeof log))
3022 goto out;
3023 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3024 if (r)
3025 goto out;
3026 break;
3027 }
3028 case KVM_SET_MEMORY_ALIAS: {
3029 struct kvm_memory_alias alias;
3030
3031 r = -EFAULT;
3032 if (copy_from_user(&alias, argp, sizeof alias))
3033 goto out;
3034 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
3035 if (r)
3036 goto out;
3037 break;
3038 }
3039 case KVM_CREATE_IRQCHIP:
3040 r = -ENOMEM;
3041 kvm->vpic = kvm_create_pic(kvm);
3042 if (kvm->vpic) {
3043 r = kvm_ioapic_init(kvm);
3044 if (r) {
3045 kfree(kvm->vpic);
3046 kvm->vpic = NULL;
3047 goto out;
3048 }
3049 }
3050 else
3051 goto out;
3052 break;
3053 case KVM_IRQ_LINE: {
3054 struct kvm_irq_level irq_event;
3055
3056 r = -EFAULT;
3057 if (copy_from_user(&irq_event, argp, sizeof irq_event))
3058 goto out;
3059 if (irqchip_in_kernel(kvm)) {
3060 mutex_lock(&kvm->lock);
3061 if (irq_event.irq < 16)
3062 kvm_pic_set_irq(pic_irqchip(kvm),
3063 irq_event.irq,
3064 irq_event.level);
3065 kvm_ioapic_set_irq(kvm->vioapic,
3066 irq_event.irq,
3067 irq_event.level);
3068 mutex_unlock(&kvm->lock);
3069 r = 0;
3070 }
3071 break;
3072 }
3073 case KVM_GET_IRQCHIP: {
3074 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3075 struct kvm_irqchip chip;
3076
3077 r = -EFAULT;
3078 if (copy_from_user(&chip, argp, sizeof chip))
3079 goto out;
3080 r = -ENXIO;
3081 if (!irqchip_in_kernel(kvm))
3082 goto out;
3083 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
3084 if (r)
3085 goto out;
3086 r = -EFAULT;
3087 if (copy_to_user(argp, &chip, sizeof chip))
3088 goto out;
3089 r = 0;
3090 break;
3091 }
3092 case KVM_SET_IRQCHIP: {
3093 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3094 struct kvm_irqchip chip;
3095
3096 r = -EFAULT;
3097 if (copy_from_user(&chip, argp, sizeof chip))
3098 goto out;
3099 r = -ENXIO;
3100 if (!irqchip_in_kernel(kvm))
3101 goto out;
3102 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
3103 if (r)
3104 goto out;
3105 r = 0;
3106 break;
3107 }
3108 default:
3109 ;
3110 }
3111 out:
3112 return r;
3113 }
3114
3115 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
3116 unsigned long address,
3117 int *type)
3118 {
3119 struct kvm *kvm = vma->vm_file->private_data;
3120 unsigned long pgoff;
3121 struct page *page;
3122
3123 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
3124 page = gfn_to_page(kvm, pgoff);
3125 if (!page)
3126 return NOPAGE_SIGBUS;
3127 get_page(page);
3128 if (type != NULL)
3129 *type = VM_FAULT_MINOR;
3130
3131 return page;
3132 }
3133
3134 static struct vm_operations_struct kvm_vm_vm_ops = {
3135 .nopage = kvm_vm_nopage,
3136 };
3137
3138 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
3139 {
3140 vma->vm_ops = &kvm_vm_vm_ops;
3141 return 0;
3142 }
3143
3144 static struct file_operations kvm_vm_fops = {
3145 .release = kvm_vm_release,
3146 .unlocked_ioctl = kvm_vm_ioctl,
3147 .compat_ioctl = kvm_vm_ioctl,
3148 .mmap = kvm_vm_mmap,
3149 };
3150
3151 static int kvm_dev_ioctl_create_vm(void)
3152 {
3153 int fd, r;
3154 struct inode *inode;
3155 struct file *file;
3156 struct kvm *kvm;
3157
3158 kvm = kvm_create_vm();
3159 if (IS_ERR(kvm))
3160 return PTR_ERR(kvm);
3161 r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
3162 if (r) {
3163 kvm_destroy_vm(kvm);
3164 return r;
3165 }
3166
3167 kvm->filp = file;
3168
3169 return fd;
3170 }
3171
3172 static long kvm_dev_ioctl(struct file *filp,
3173 unsigned int ioctl, unsigned long arg)
3174 {
3175 void __user *argp = (void __user *)arg;
3176 long r = -EINVAL;
3177
3178 switch (ioctl) {
3179 case KVM_GET_API_VERSION:
3180 r = -EINVAL;
3181 if (arg)
3182 goto out;
3183 r = KVM_API_VERSION;
3184 break;
3185 case KVM_CREATE_VM:
3186 r = -EINVAL;
3187 if (arg)
3188 goto out;
3189 r = kvm_dev_ioctl_create_vm();
3190 break;
3191 case KVM_GET_MSR_INDEX_LIST: {
3192 struct kvm_msr_list __user *user_msr_list = argp;
3193 struct kvm_msr_list msr_list;
3194 unsigned n;
3195
3196 r = -EFAULT;
3197 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
3198 goto out;
3199 n = msr_list.nmsrs;
3200 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
3201 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
3202 goto out;
3203 r = -E2BIG;
3204 if (n < num_msrs_to_save)
3205 goto out;
3206 r = -EFAULT;
3207 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
3208 num_msrs_to_save * sizeof(u32)))
3209 goto out;
3210 if (copy_to_user(user_msr_list->indices
3211 + num_msrs_to_save * sizeof(u32),
3212 &emulated_msrs,
3213 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
3214 goto out;
3215 r = 0;
3216 break;
3217 }
3218 case KVM_CHECK_EXTENSION: {
3219 int ext = (long)argp;
3220
3221 switch (ext) {
3222 case KVM_CAP_IRQCHIP:
3223 case KVM_CAP_HLT:
3224 r = 1;
3225 break;
3226 default:
3227 r = 0;
3228 break;
3229 }
3230 break;
3231 }
3232 case KVM_GET_VCPU_MMAP_SIZE:
3233 r = -EINVAL;
3234 if (arg)
3235 goto out;
3236 r = 2 * PAGE_SIZE;
3237 break;
3238 default:
3239 ;
3240 }
3241 out:
3242 return r;
3243 }
3244
3245 static struct file_operations kvm_chardev_ops = {
3246 .unlocked_ioctl = kvm_dev_ioctl,
3247 .compat_ioctl = kvm_dev_ioctl,
3248 };
3249
3250 static struct miscdevice kvm_dev = {
3251 KVM_MINOR,
3252 "kvm",
3253 &kvm_chardev_ops,
3254 };
3255
3256 /*
3257 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
3258 * cached on it.
3259 */
3260 static void decache_vcpus_on_cpu(int cpu)
3261 {
3262 struct kvm *vm;
3263 struct kvm_vcpu *vcpu;
3264 int i;
3265
3266 spin_lock(&kvm_lock);
3267 list_for_each_entry(vm, &vm_list, vm_list)
3268 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3269 vcpu = vm->vcpus[i];
3270 if (!vcpu)
3271 continue;
3272 /*
3273 * If the vcpu is locked, then it is running on some
3274 * other cpu and therefore it is not cached on the
3275 * cpu in question.
3276 *
3277 * If it's not locked, check the last cpu it executed
3278 * on.
3279 */
3280 if (mutex_trylock(&vcpu->mutex)) {
3281 if (vcpu->cpu == cpu) {
3282 kvm_x86_ops->vcpu_decache(vcpu);
3283 vcpu->cpu = -1;
3284 }
3285 mutex_unlock(&vcpu->mutex);
3286 }
3287 }
3288 spin_unlock(&kvm_lock);
3289 }
3290
3291 static void hardware_enable(void *junk)
3292 {
3293 int cpu = raw_smp_processor_id();
3294
3295 if (cpu_isset(cpu, cpus_hardware_enabled))
3296 return;
3297 cpu_set(cpu, cpus_hardware_enabled);
3298 kvm_x86_ops->hardware_enable(NULL);
3299 }
3300
3301 static void hardware_disable(void *junk)
3302 {
3303 int cpu = raw_smp_processor_id();
3304
3305 if (!cpu_isset(cpu, cpus_hardware_enabled))
3306 return;
3307 cpu_clear(cpu, cpus_hardware_enabled);
3308 decache_vcpus_on_cpu(cpu);
3309 kvm_x86_ops->hardware_disable(NULL);
3310 }
3311
3312 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3313 void *v)
3314 {
3315 int cpu = (long)v;
3316
3317 switch (val) {
3318 case CPU_DYING:
3319 case CPU_DYING_FROZEN:
3320 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3321 cpu);
3322 hardware_disable(NULL);
3323 break;
3324 case CPU_UP_CANCELED:
3325 case CPU_UP_CANCELED_FROZEN:
3326 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3327 cpu);
3328 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
3329 break;
3330 case CPU_ONLINE:
3331 case CPU_ONLINE_FROZEN:
3332 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
3333 cpu);
3334 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
3335 break;
3336 }
3337 return NOTIFY_OK;
3338 }
3339
3340 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3341 void *v)
3342 {
3343 if (val == SYS_RESTART) {
3344 /*
3345 * Some (well, at least mine) BIOSes hang on reboot if
3346 * in vmx root mode.
3347 */
3348 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
3349 on_each_cpu(hardware_disable, NULL, 0, 1);
3350 }
3351 return NOTIFY_OK;
3352 }
3353
3354 static struct notifier_block kvm_reboot_notifier = {
3355 .notifier_call = kvm_reboot,
3356 .priority = 0,
3357 };
3358
3359 void kvm_io_bus_init(struct kvm_io_bus *bus)
3360 {
3361 memset(bus, 0, sizeof(*bus));
3362 }
3363
3364 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3365 {
3366 int i;
3367
3368 for (i = 0; i < bus->dev_count; i++) {
3369 struct kvm_io_device *pos = bus->devs[i];
3370
3371 kvm_iodevice_destructor(pos);
3372 }
3373 }
3374
3375 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
3376 {
3377 int i;
3378
3379 for (i = 0; i < bus->dev_count; i++) {
3380 struct kvm_io_device *pos = bus->devs[i];
3381
3382 if (pos->in_range(pos, addr))
3383 return pos;
3384 }
3385
3386 return NULL;
3387 }
3388
3389 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
3390 {
3391 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
3392
3393 bus->devs[bus->dev_count++] = dev;
3394 }
3395
3396 static struct notifier_block kvm_cpu_notifier = {
3397 .notifier_call = kvm_cpu_hotplug,
3398 .priority = 20, /* must be > scheduler priority */
3399 };
3400
3401 static u64 stat_get(void *_offset)
3402 {
3403 unsigned offset = (long)_offset;
3404 u64 total = 0;
3405 struct kvm *kvm;
3406 struct kvm_vcpu *vcpu;
3407 int i;
3408
3409 spin_lock(&kvm_lock);
3410 list_for_each_entry(kvm, &vm_list, vm_list)
3411 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3412 vcpu = kvm->vcpus[i];
3413 if (vcpu)
3414 total += *(u32 *)((void *)vcpu + offset);
3415 }
3416 spin_unlock(&kvm_lock);
3417 return total;
3418 }
3419
3420 DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, NULL, "%llu\n");
3421
3422 static __init void kvm_init_debug(void)
3423 {
3424 struct kvm_stats_debugfs_item *p;
3425
3426 debugfs_dir = debugfs_create_dir("kvm", NULL);
3427 for (p = debugfs_entries; p->name; ++p)
3428 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3429 (void *)(long)p->offset,
3430 &stat_fops);
3431 }
3432
3433 static void kvm_exit_debug(void)
3434 {
3435 struct kvm_stats_debugfs_item *p;
3436
3437 for (p = debugfs_entries; p->name; ++p)
3438 debugfs_remove(p->dentry);
3439 debugfs_remove(debugfs_dir);
3440 }
3441
3442 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3443 {
3444 hardware_disable(NULL);
3445 return 0;
3446 }
3447
3448 static int kvm_resume(struct sys_device *dev)
3449 {
3450 hardware_enable(NULL);
3451 return 0;
3452 }
3453
3454 static struct sysdev_class kvm_sysdev_class = {
3455 set_kset_name("kvm"),
3456 .suspend = kvm_suspend,
3457 .resume = kvm_resume,
3458 };
3459
3460 static struct sys_device kvm_sysdev = {
3461 .id = 0,
3462 .cls = &kvm_sysdev_class,
3463 };
3464
3465 hpa_t bad_page_address;
3466
3467 static inline
3468 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3469 {
3470 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3471 }
3472
3473 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3474 {
3475 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3476
3477 kvm_x86_ops->vcpu_load(vcpu, cpu);
3478 }
3479
3480 static void kvm_sched_out(struct preempt_notifier *pn,
3481 struct task_struct *next)
3482 {
3483 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3484
3485 kvm_x86_ops->vcpu_put(vcpu);
3486 }
3487
3488 int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
3489 struct module *module)
3490 {
3491 int r;
3492 int cpu;
3493
3494 if (kvm_x86_ops) {
3495 printk(KERN_ERR "kvm: already loaded the other module\n");
3496 return -EEXIST;
3497 }
3498
3499 if (!ops->cpu_has_kvm_support()) {
3500 printk(KERN_ERR "kvm: no hardware support\n");
3501 return -EOPNOTSUPP;
3502 }
3503 if (ops->disabled_by_bios()) {
3504 printk(KERN_ERR "kvm: disabled by bios\n");
3505 return -EOPNOTSUPP;
3506 }
3507
3508 kvm_x86_ops = ops;
3509
3510 r = kvm_x86_ops->hardware_setup();
3511 if (r < 0)
3512 goto out;
3513
3514 for_each_online_cpu(cpu) {
3515 smp_call_function_single(cpu,
3516 kvm_x86_ops->check_processor_compatibility,
3517 &r, 0, 1);
3518 if (r < 0)
3519 goto out_free_0;
3520 }
3521
3522 on_each_cpu(hardware_enable, NULL, 0, 1);
3523 r = register_cpu_notifier(&kvm_cpu_notifier);
3524 if (r)
3525 goto out_free_1;
3526 register_reboot_notifier(&kvm_reboot_notifier);
3527
3528 r = sysdev_class_register(&kvm_sysdev_class);
3529 if (r)
3530 goto out_free_2;
3531
3532 r = sysdev_register(&kvm_sysdev);
3533 if (r)
3534 goto out_free_3;
3535
3536 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3537 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
3538 __alignof__(struct kvm_vcpu), 0, 0);
3539 if (!kvm_vcpu_cache) {
3540 r = -ENOMEM;
3541 goto out_free_4;
3542 }
3543
3544 kvm_chardev_ops.owner = module;
3545
3546 r = misc_register(&kvm_dev);
3547 if (r) {
3548 printk (KERN_ERR "kvm: misc device register failed\n");
3549 goto out_free;
3550 }
3551
3552 kvm_preempt_ops.sched_in = kvm_sched_in;
3553 kvm_preempt_ops.sched_out = kvm_sched_out;
3554
3555 return r;
3556
3557 out_free:
3558 kmem_cache_destroy(kvm_vcpu_cache);
3559 out_free_4:
3560 sysdev_unregister(&kvm_sysdev);
3561 out_free_3:
3562 sysdev_class_unregister(&kvm_sysdev_class);
3563 out_free_2:
3564 unregister_reboot_notifier(&kvm_reboot_notifier);
3565 unregister_cpu_notifier(&kvm_cpu_notifier);
3566 out_free_1:
3567 on_each_cpu(hardware_disable, NULL, 0, 1);
3568 out_free_0:
3569 kvm_x86_ops->hardware_unsetup();
3570 out:
3571 kvm_x86_ops = NULL;
3572 return r;
3573 }
3574
3575 void kvm_exit_x86(void)
3576 {
3577 misc_deregister(&kvm_dev);
3578 kmem_cache_destroy(kvm_vcpu_cache);
3579 sysdev_unregister(&kvm_sysdev);
3580 sysdev_class_unregister(&kvm_sysdev_class);
3581 unregister_reboot_notifier(&kvm_reboot_notifier);
3582 unregister_cpu_notifier(&kvm_cpu_notifier);
3583 on_each_cpu(hardware_disable, NULL, 0, 1);
3584 kvm_x86_ops->hardware_unsetup();
3585 kvm_x86_ops = NULL;
3586 }
3587
3588 static __init int kvm_init(void)
3589 {
3590 static struct page *bad_page;
3591 int r;
3592
3593 r = kvm_mmu_module_init();
3594 if (r)
3595 goto out4;
3596
3597 kvm_init_debug();
3598
3599 kvm_init_msr_list();
3600
3601 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3602 r = -ENOMEM;
3603 goto out;
3604 }
3605
3606 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3607 memset(__va(bad_page_address), 0, PAGE_SIZE);
3608
3609 return 0;
3610
3611 out:
3612 kvm_exit_debug();
3613 kvm_mmu_module_exit();
3614 out4:
3615 return r;
3616 }
3617
3618 static __exit void kvm_exit(void)
3619 {
3620 kvm_exit_debug();
3621 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
3622 kvm_mmu_module_exit();
3623 }
3624
3625 module_init(kvm_init)
3626 module_exit(kvm_exit)
3627
3628 EXPORT_SYMBOL_GPL(kvm_init_x86);
3629 EXPORT_SYMBOL_GPL(kvm_exit_x86);
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