2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
19 #include "x86_emulate.h"
20 #include "segment_descriptor.h"
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>
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 #include <linux/kvm_para.h>
44 #include <asm/processor.h>
47 #include <asm/uaccess.h>
50 MODULE_AUTHOR("Qumranet");
51 MODULE_LICENSE("GPL");
53 static DEFINE_SPINLOCK(kvm_lock);
54 static LIST_HEAD(vm_list);
56 static cpumask_t cpus_hardware_enabled;
58 struct kvm_x86_ops *kvm_x86_ops;
59 struct kmem_cache *kvm_vcpu_cache;
60 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
62 static __read_mostly struct preempt_ops kvm_preempt_ops;
64 #define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
66 static struct kvm_stats_debugfs_item {
69 struct dentry *dentry;
70 } debugfs_entries[] = {
71 { "pf_fixed", STAT_OFFSET(pf_fixed) },
72 { "pf_guest", STAT_OFFSET(pf_guest) },
73 { "tlb_flush", STAT_OFFSET(tlb_flush) },
74 { "invlpg", STAT_OFFSET(invlpg) },
75 { "exits", STAT_OFFSET(exits) },
76 { "io_exits", STAT_OFFSET(io_exits) },
77 { "mmio_exits", STAT_OFFSET(mmio_exits) },
78 { "signal_exits", STAT_OFFSET(signal_exits) },
79 { "irq_window", STAT_OFFSET(irq_window_exits) },
80 { "halt_exits", STAT_OFFSET(halt_exits) },
81 { "halt_wakeup", STAT_OFFSET(halt_wakeup) },
82 { "request_irq", STAT_OFFSET(request_irq_exits) },
83 { "irq_exits", STAT_OFFSET(irq_exits) },
84 { "light_exits", STAT_OFFSET(light_exits) },
85 { "efer_reload", STAT_OFFSET(efer_reload) },
89 static struct dentry *debugfs_dir;
91 #define MAX_IO_MSRS 256
93 #define CR0_RESERVED_BITS \
94 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
95 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
96 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
97 #define CR4_RESERVED_BITS \
98 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
99 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
100 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
101 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
103 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
104 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
107 // LDT or TSS descriptor in the GDT. 16 bytes.
108 struct segment_descriptor_64 {
109 struct segment_descriptor s;
116 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
119 unsigned long segment_base(u16 selector)
121 struct descriptor_table gdt;
122 struct segment_descriptor *d;
123 unsigned long table_base;
124 typedef unsigned long ul;
130 asm ("sgdt %0" : "=m"(gdt));
131 table_base = gdt.base;
133 if (selector & 4) { /* from ldt */
136 asm ("sldt %0" : "=g"(ldt_selector));
137 table_base = segment_base(ldt_selector);
139 d = (struct segment_descriptor *)(table_base + (selector & ~7));
140 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
143 && (d->type == 2 || d->type == 9 || d->type == 11))
144 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
148 EXPORT_SYMBOL_GPL(segment_base);
150 static inline int valid_vcpu(int n)
152 return likely(n >= 0 && n < KVM_MAX_VCPUS);
155 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
157 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
160 vcpu->guest_fpu_loaded = 1;
161 fx_save(&vcpu->host_fx_image);
162 fx_restore(&vcpu->guest_fx_image);
164 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
166 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
168 if (!vcpu->guest_fpu_loaded)
171 vcpu->guest_fpu_loaded = 0;
172 fx_save(&vcpu->guest_fx_image);
173 fx_restore(&vcpu->host_fx_image);
175 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
178 * Switches to specified vcpu, until a matching vcpu_put()
180 static void vcpu_load(struct kvm_vcpu *vcpu)
184 mutex_lock(&vcpu->mutex);
186 preempt_notifier_register(&vcpu->preempt_notifier);
187 kvm_x86_ops->vcpu_load(vcpu, cpu);
191 static void vcpu_put(struct kvm_vcpu *vcpu)
194 kvm_x86_ops->vcpu_put(vcpu);
195 preempt_notifier_unregister(&vcpu->preempt_notifier);
197 mutex_unlock(&vcpu->mutex);
200 static void ack_flush(void *_completed)
204 void kvm_flush_remote_tlbs(struct kvm *kvm)
208 struct kvm_vcpu *vcpu;
211 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
212 vcpu = kvm->vcpus[i];
215 if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests))
218 if (cpu != -1 && cpu != raw_smp_processor_id())
221 smp_call_function_mask(cpus, ack_flush, NULL, 1);
224 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
229 mutex_init(&vcpu->mutex);
231 vcpu->mmu.root_hpa = INVALID_PAGE;
234 if (!irqchip_in_kernel(kvm) || id == 0)
235 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
237 vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
238 init_waitqueue_head(&vcpu->wq);
240 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
245 vcpu->run = page_address(page);
247 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
252 vcpu->pio_data = page_address(page);
254 r = kvm_mmu_create(vcpu);
256 goto fail_free_pio_data;
261 free_page((unsigned long)vcpu->pio_data);
263 free_page((unsigned long)vcpu->run);
267 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
269 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
271 kvm_free_lapic(vcpu);
272 kvm_mmu_destroy(vcpu);
273 free_page((unsigned long)vcpu->pio_data);
274 free_page((unsigned long)vcpu->run);
276 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
278 static struct kvm *kvm_create_vm(void)
280 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
283 return ERR_PTR(-ENOMEM);
285 kvm_io_bus_init(&kvm->pio_bus);
286 mutex_init(&kvm->lock);
287 INIT_LIST_HEAD(&kvm->active_mmu_pages);
288 kvm_io_bus_init(&kvm->mmio_bus);
289 spin_lock(&kvm_lock);
290 list_add(&kvm->vm_list, &vm_list);
291 spin_unlock(&kvm_lock);
296 * Free any memory in @free but not in @dont.
298 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
299 struct kvm_memory_slot *dont)
303 if (!dont || free->phys_mem != dont->phys_mem)
304 if (free->phys_mem) {
305 for (i = 0; i < free->npages; ++i)
306 if (free->phys_mem[i])
307 __free_page(free->phys_mem[i]);
308 vfree(free->phys_mem);
310 if (!dont || free->rmap != dont->rmap)
313 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
314 vfree(free->dirty_bitmap);
316 free->phys_mem = NULL;
318 free->dirty_bitmap = NULL;
321 static void kvm_free_physmem(struct kvm *kvm)
325 for (i = 0; i < kvm->nmemslots; ++i)
326 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
329 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
333 for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
334 if (vcpu->pio.guest_pages[i]) {
335 __free_page(vcpu->pio.guest_pages[i]);
336 vcpu->pio.guest_pages[i] = NULL;
340 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
343 kvm_mmu_unload(vcpu);
347 static void kvm_free_vcpus(struct kvm *kvm)
352 * Unpin any mmu pages first.
354 for (i = 0; i < KVM_MAX_VCPUS; ++i)
356 kvm_unload_vcpu_mmu(kvm->vcpus[i]);
357 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
359 kvm_x86_ops->vcpu_free(kvm->vcpus[i]);
360 kvm->vcpus[i] = NULL;
366 static void kvm_destroy_vm(struct kvm *kvm)
368 spin_lock(&kvm_lock);
369 list_del(&kvm->vm_list);
370 spin_unlock(&kvm_lock);
371 kvm_io_bus_destroy(&kvm->pio_bus);
372 kvm_io_bus_destroy(&kvm->mmio_bus);
376 kvm_free_physmem(kvm);
380 static int kvm_vm_release(struct inode *inode, struct file *filp)
382 struct kvm *kvm = filp->private_data;
388 static void inject_gp(struct kvm_vcpu *vcpu)
390 kvm_x86_ops->inject_gp(vcpu, 0);
394 * Load the pae pdptrs. Return true is they are all valid.
396 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
398 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
399 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
402 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
404 mutex_lock(&vcpu->kvm->lock);
405 ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
406 offset * sizeof(u64), sizeof(pdpte));
411 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
412 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
419 memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
421 mutex_unlock(&vcpu->kvm->lock);
426 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
428 if (cr0 & CR0_RESERVED_BITS) {
429 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
435 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
436 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
441 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
442 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
443 "and a clear PE flag\n");
448 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
450 if ((vcpu->shadow_efer & EFER_LME)) {
454 printk(KERN_DEBUG "set_cr0: #GP, start paging "
455 "in long mode while PAE is disabled\n");
459 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
461 printk(KERN_DEBUG "set_cr0: #GP, start paging "
462 "in long mode while CS.L == 1\n");
469 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
470 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
478 kvm_x86_ops->set_cr0(vcpu, cr0);
481 mutex_lock(&vcpu->kvm->lock);
482 kvm_mmu_reset_context(vcpu);
483 mutex_unlock(&vcpu->kvm->lock);
486 EXPORT_SYMBOL_GPL(set_cr0);
488 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
490 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
492 EXPORT_SYMBOL_GPL(lmsw);
494 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
496 if (cr4 & CR4_RESERVED_BITS) {
497 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
502 if (is_long_mode(vcpu)) {
503 if (!(cr4 & X86_CR4_PAE)) {
504 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
509 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
510 && !load_pdptrs(vcpu, vcpu->cr3)) {
511 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
516 if (cr4 & X86_CR4_VMXE) {
517 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
521 kvm_x86_ops->set_cr4(vcpu, cr4);
523 mutex_lock(&vcpu->kvm->lock);
524 kvm_mmu_reset_context(vcpu);
525 mutex_unlock(&vcpu->kvm->lock);
527 EXPORT_SYMBOL_GPL(set_cr4);
529 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
531 if (is_long_mode(vcpu)) {
532 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
533 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
539 if (cr3 & CR3_PAE_RESERVED_BITS) {
541 "set_cr3: #GP, reserved bits\n");
545 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
546 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
553 * We don't check reserved bits in nonpae mode, because
554 * this isn't enforced, and VMware depends on this.
558 mutex_lock(&vcpu->kvm->lock);
560 * Does the new cr3 value map to physical memory? (Note, we
561 * catch an invalid cr3 even in real-mode, because it would
562 * cause trouble later on when we turn on paging anyway.)
564 * A real CPU would silently accept an invalid cr3 and would
565 * attempt to use it - with largely undefined (and often hard
566 * to debug) behavior on the guest side.
568 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
572 vcpu->mmu.new_cr3(vcpu);
574 mutex_unlock(&vcpu->kvm->lock);
576 EXPORT_SYMBOL_GPL(set_cr3);
578 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
580 if (cr8 & CR8_RESERVED_BITS) {
581 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
585 if (irqchip_in_kernel(vcpu->kvm))
586 kvm_lapic_set_tpr(vcpu, cr8);
590 EXPORT_SYMBOL_GPL(set_cr8);
592 unsigned long get_cr8(struct kvm_vcpu *vcpu)
594 if (irqchip_in_kernel(vcpu->kvm))
595 return kvm_lapic_get_cr8(vcpu);
599 EXPORT_SYMBOL_GPL(get_cr8);
601 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
603 if (irqchip_in_kernel(vcpu->kvm))
604 return vcpu->apic_base;
606 return vcpu->apic_base;
608 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
610 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
612 /* TODO: reserve bits check */
613 if (irqchip_in_kernel(vcpu->kvm))
614 kvm_lapic_set_base(vcpu, data);
616 vcpu->apic_base = data;
618 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
620 void fx_init(struct kvm_vcpu *vcpu)
622 unsigned after_mxcsr_mask;
624 /* Initialize guest FPU by resetting ours and saving into guest's */
626 fx_save(&vcpu->host_fx_image);
628 fx_save(&vcpu->guest_fx_image);
629 fx_restore(&vcpu->host_fx_image);
632 vcpu->cr0 |= X86_CR0_ET;
633 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
634 vcpu->guest_fx_image.mxcsr = 0x1f80;
635 memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
636 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
638 EXPORT_SYMBOL_GPL(fx_init);
641 * Allocate some memory and give it an address in the guest physical address
644 * Discontiguous memory is allowed, mostly for framebuffers.
646 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
647 struct kvm_memory_region *mem)
651 unsigned long npages;
653 struct kvm_memory_slot *memslot;
654 struct kvm_memory_slot old, new;
657 /* General sanity checks */
658 if (mem->memory_size & (PAGE_SIZE - 1))
660 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
662 if (mem->slot >= KVM_MEMORY_SLOTS)
664 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
667 memslot = &kvm->memslots[mem->slot];
668 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
669 npages = mem->memory_size >> PAGE_SHIFT;
672 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
674 mutex_lock(&kvm->lock);
676 new = old = *memslot;
678 new.base_gfn = base_gfn;
680 new.flags = mem->flags;
682 /* Disallow changing a memory slot's size. */
684 if (npages && old.npages && npages != old.npages)
687 /* Check for overlaps */
689 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
690 struct kvm_memory_slot *s = &kvm->memslots[i];
694 if (!((base_gfn + npages <= s->base_gfn) ||
695 (base_gfn >= s->base_gfn + s->npages)))
699 /* Deallocate if slot is being removed */
703 /* Free page dirty bitmap if unneeded */
704 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
705 new.dirty_bitmap = NULL;
709 /* Allocate if a slot is being created */
710 if (npages && !new.phys_mem) {
711 new.phys_mem = vmalloc(npages * sizeof(struct page *));
716 new.rmap = vmalloc(npages * sizeof(struct page*));
721 memset(new.phys_mem, 0, npages * sizeof(struct page *));
722 memset(new.rmap, 0, npages * sizeof(*new.rmap));
723 for (i = 0; i < npages; ++i) {
724 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
726 if (!new.phys_mem[i])
731 /* Allocate page dirty bitmap if needed */
732 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
733 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
735 new.dirty_bitmap = vmalloc(dirty_bytes);
736 if (!new.dirty_bitmap)
738 memset(new.dirty_bitmap, 0, dirty_bytes);
741 if (mem->slot >= kvm->nmemslots)
742 kvm->nmemslots = mem->slot + 1;
744 if (!kvm->n_requested_mmu_pages) {
745 unsigned int n_pages;
748 n_pages = npages * KVM_PERMILLE_MMU_PAGES / 1000;
749 kvm_mmu_change_mmu_pages(kvm, kvm->n_alloc_mmu_pages +
752 unsigned int nr_mmu_pages;
754 n_pages = old.npages * KVM_PERMILLE_MMU_PAGES / 1000;
755 nr_mmu_pages = kvm->n_alloc_mmu_pages - n_pages;
756 nr_mmu_pages = max(nr_mmu_pages,
757 (unsigned int) KVM_MIN_ALLOC_MMU_PAGES);
758 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
764 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
765 kvm_flush_remote_tlbs(kvm);
767 mutex_unlock(&kvm->lock);
769 kvm_free_physmem_slot(&old, &new);
773 mutex_unlock(&kvm->lock);
774 kvm_free_physmem_slot(&new, &old);
779 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
780 u32 kvm_nr_mmu_pages)
782 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
785 mutex_lock(&kvm->lock);
787 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
788 kvm->n_requested_mmu_pages = kvm_nr_mmu_pages;
790 mutex_unlock(&kvm->lock);
794 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
796 return kvm->n_alloc_mmu_pages;
800 * Get (and clear) the dirty memory log for a memory slot.
802 static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
803 struct kvm_dirty_log *log)
805 struct kvm_memory_slot *memslot;
808 unsigned long any = 0;
810 mutex_lock(&kvm->lock);
813 if (log->slot >= KVM_MEMORY_SLOTS)
816 memslot = &kvm->memslots[log->slot];
818 if (!memslot->dirty_bitmap)
821 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
823 for (i = 0; !any && i < n/sizeof(long); ++i)
824 any = memslot->dirty_bitmap[i];
827 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
830 /* If nothing is dirty, don't bother messing with page tables. */
832 kvm_mmu_slot_remove_write_access(kvm, log->slot);
833 kvm_flush_remote_tlbs(kvm);
834 memset(memslot->dirty_bitmap, 0, n);
840 mutex_unlock(&kvm->lock);
845 * Set a new alias region. Aliases map a portion of physical memory into
846 * another portion. This is useful for memory windows, for example the PC
849 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
850 struct kvm_memory_alias *alias)
853 struct kvm_mem_alias *p;
856 /* General sanity checks */
857 if (alias->memory_size & (PAGE_SIZE - 1))
859 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
861 if (alias->slot >= KVM_ALIAS_SLOTS)
863 if (alias->guest_phys_addr + alias->memory_size
864 < alias->guest_phys_addr)
866 if (alias->target_phys_addr + alias->memory_size
867 < alias->target_phys_addr)
870 mutex_lock(&kvm->lock);
872 p = &kvm->aliases[alias->slot];
873 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
874 p->npages = alias->memory_size >> PAGE_SHIFT;
875 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
877 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
878 if (kvm->aliases[n - 1].npages)
882 kvm_mmu_zap_all(kvm);
884 mutex_unlock(&kvm->lock);
892 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
897 switch (chip->chip_id) {
898 case KVM_IRQCHIP_PIC_MASTER:
899 memcpy (&chip->chip.pic,
900 &pic_irqchip(kvm)->pics[0],
901 sizeof(struct kvm_pic_state));
903 case KVM_IRQCHIP_PIC_SLAVE:
904 memcpy (&chip->chip.pic,
905 &pic_irqchip(kvm)->pics[1],
906 sizeof(struct kvm_pic_state));
908 case KVM_IRQCHIP_IOAPIC:
909 memcpy (&chip->chip.ioapic,
911 sizeof(struct kvm_ioapic_state));
920 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
925 switch (chip->chip_id) {
926 case KVM_IRQCHIP_PIC_MASTER:
927 memcpy (&pic_irqchip(kvm)->pics[0],
929 sizeof(struct kvm_pic_state));
931 case KVM_IRQCHIP_PIC_SLAVE:
932 memcpy (&pic_irqchip(kvm)->pics[1],
934 sizeof(struct kvm_pic_state));
936 case KVM_IRQCHIP_IOAPIC:
937 memcpy (ioapic_irqchip(kvm),
939 sizeof(struct kvm_ioapic_state));
945 kvm_pic_update_irq(pic_irqchip(kvm));
949 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
952 struct kvm_mem_alias *alias;
954 for (i = 0; i < kvm->naliases; ++i) {
955 alias = &kvm->aliases[i];
956 if (gfn >= alias->base_gfn
957 && gfn < alias->base_gfn + alias->npages)
958 return alias->target_gfn + gfn - alias->base_gfn;
963 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
967 for (i = 0; i < kvm->nmemslots; ++i) {
968 struct kvm_memory_slot *memslot = &kvm->memslots[i];
970 if (gfn >= memslot->base_gfn
971 && gfn < memslot->base_gfn + memslot->npages)
977 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
979 gfn = unalias_gfn(kvm, gfn);
980 return __gfn_to_memslot(kvm, gfn);
983 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
985 struct kvm_memory_slot *slot;
987 gfn = unalias_gfn(kvm, gfn);
988 slot = __gfn_to_memslot(kvm, gfn);
991 return slot->phys_mem[gfn - slot->base_gfn];
993 EXPORT_SYMBOL_GPL(gfn_to_page);
995 static int next_segment(unsigned long len, int offset)
997 if (len > PAGE_SIZE - offset)
998 return PAGE_SIZE - offset;
1003 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1009 page = gfn_to_page(kvm, gfn);
1012 page_virt = kmap_atomic(page, KM_USER0);
1014 memcpy(data, page_virt + offset, len);
1016 kunmap_atomic(page_virt, KM_USER0);
1019 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1021 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1023 gfn_t gfn = gpa >> PAGE_SHIFT;
1025 int offset = offset_in_page(gpa);
1028 while ((seg = next_segment(len, offset)) != 0) {
1029 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1039 EXPORT_SYMBOL_GPL(kvm_read_guest);
1041 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1042 int offset, int len)
1047 page = gfn_to_page(kvm, gfn);
1050 page_virt = kmap_atomic(page, KM_USER0);
1052 memcpy(page_virt + offset, data, len);
1054 kunmap_atomic(page_virt, KM_USER0);
1055 mark_page_dirty(kvm, gfn);
1058 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1060 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1063 gfn_t gfn = gpa >> PAGE_SHIFT;
1065 int offset = offset_in_page(gpa);
1068 while ((seg = next_segment(len, offset)) != 0) {
1069 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1080 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1085 page = gfn_to_page(kvm, gfn);
1088 page_virt = kmap_atomic(page, KM_USER0);
1090 memset(page_virt + offset, 0, len);
1092 kunmap_atomic(page_virt, KM_USER0);
1095 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1097 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1099 gfn_t gfn = gpa >> PAGE_SHIFT;
1101 int offset = offset_in_page(gpa);
1104 while ((seg = next_segment(len, offset)) != 0) {
1105 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1114 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1116 /* WARNING: Does not work on aliased pages. */
1117 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1119 struct kvm_memory_slot *memslot;
1121 memslot = __gfn_to_memslot(kvm, gfn);
1122 if (memslot && memslot->dirty_bitmap) {
1123 unsigned long rel_gfn = gfn - memslot->base_gfn;
1126 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1127 set_bit(rel_gfn, memslot->dirty_bitmap);
1131 int emulator_read_std(unsigned long addr,
1134 struct kvm_vcpu *vcpu)
1139 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1140 unsigned offset = addr & (PAGE_SIZE-1);
1141 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1144 if (gpa == UNMAPPED_GVA)
1145 return X86EMUL_PROPAGATE_FAULT;
1146 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1148 return X86EMUL_UNHANDLEABLE;
1155 return X86EMUL_CONTINUE;
1157 EXPORT_SYMBOL_GPL(emulator_read_std);
1159 static int emulator_write_std(unsigned long addr,
1162 struct kvm_vcpu *vcpu)
1164 pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
1165 return X86EMUL_UNHANDLEABLE;
1169 * Only apic need an MMIO device hook, so shortcut now..
1171 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1174 struct kvm_io_device *dev;
1177 dev = &vcpu->apic->dev;
1178 if (dev->in_range(dev, addr))
1184 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1187 struct kvm_io_device *dev;
1189 dev = vcpu_find_pervcpu_dev(vcpu, addr);
1191 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1195 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1198 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1201 static int emulator_read_emulated(unsigned long addr,
1204 struct kvm_vcpu *vcpu)
1206 struct kvm_io_device *mmio_dev;
1209 if (vcpu->mmio_read_completed) {
1210 memcpy(val, vcpu->mmio_data, bytes);
1211 vcpu->mmio_read_completed = 0;
1212 return X86EMUL_CONTINUE;
1213 } else if (emulator_read_std(addr, val, bytes, vcpu)
1214 == X86EMUL_CONTINUE)
1215 return X86EMUL_CONTINUE;
1217 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1218 if (gpa == UNMAPPED_GVA)
1219 return X86EMUL_PROPAGATE_FAULT;
1222 * Is this MMIO handled locally?
1224 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1226 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1227 return X86EMUL_CONTINUE;
1230 vcpu->mmio_needed = 1;
1231 vcpu->mmio_phys_addr = gpa;
1232 vcpu->mmio_size = bytes;
1233 vcpu->mmio_is_write = 0;
1235 return X86EMUL_UNHANDLEABLE;
1238 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1239 const void *val, int bytes)
1243 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
1246 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1250 static int emulator_write_emulated_onepage(unsigned long addr,
1253 struct kvm_vcpu *vcpu)
1255 struct kvm_io_device *mmio_dev;
1256 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1258 if (gpa == UNMAPPED_GVA) {
1259 kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
1260 return X86EMUL_PROPAGATE_FAULT;
1263 if (emulator_write_phys(vcpu, gpa, val, bytes))
1264 return X86EMUL_CONTINUE;
1267 * Is this MMIO handled locally?
1269 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1271 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1272 return X86EMUL_CONTINUE;
1275 vcpu->mmio_needed = 1;
1276 vcpu->mmio_phys_addr = gpa;
1277 vcpu->mmio_size = bytes;
1278 vcpu->mmio_is_write = 1;
1279 memcpy(vcpu->mmio_data, val, bytes);
1281 return X86EMUL_CONTINUE;
1284 int emulator_write_emulated(unsigned long addr,
1287 struct kvm_vcpu *vcpu)
1289 /* Crossing a page boundary? */
1290 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1293 now = -addr & ~PAGE_MASK;
1294 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1295 if (rc != X86EMUL_CONTINUE)
1301 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1303 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1305 static int emulator_cmpxchg_emulated(unsigned long addr,
1309 struct kvm_vcpu *vcpu)
1311 static int reported;
1315 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1317 return emulator_write_emulated(addr, new, bytes, vcpu);
1320 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1322 return kvm_x86_ops->get_segment_base(vcpu, seg);
1325 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1327 return X86EMUL_CONTINUE;
1330 int emulate_clts(struct kvm_vcpu *vcpu)
1332 kvm_x86_ops->set_cr0(vcpu, vcpu->cr0 & ~X86_CR0_TS);
1333 return X86EMUL_CONTINUE;
1336 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1338 struct kvm_vcpu *vcpu = ctxt->vcpu;
1342 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1343 return X86EMUL_CONTINUE;
1345 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1346 return X86EMUL_UNHANDLEABLE;
1350 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1352 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1355 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1357 /* FIXME: better handling */
1358 return X86EMUL_UNHANDLEABLE;
1360 return X86EMUL_CONTINUE;
1363 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
1365 static int reported;
1367 unsigned long rip = vcpu->rip;
1368 unsigned long rip_linear;
1370 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
1375 emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
1377 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
1378 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1381 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
1383 struct x86_emulate_ops emulate_ops = {
1384 .read_std = emulator_read_std,
1385 .write_std = emulator_write_std,
1386 .read_emulated = emulator_read_emulated,
1387 .write_emulated = emulator_write_emulated,
1388 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1391 int emulate_instruction(struct kvm_vcpu *vcpu,
1392 struct kvm_run *run,
1399 vcpu->mmio_fault_cr2 = cr2;
1400 kvm_x86_ops->cache_regs(vcpu);
1402 vcpu->mmio_is_write = 0;
1403 vcpu->pio.string = 0;
1407 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1409 vcpu->emulate_ctxt.vcpu = vcpu;
1410 vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
1411 vcpu->emulate_ctxt.cr2 = cr2;
1412 vcpu->emulate_ctxt.mode =
1413 (vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM)
1414 ? X86EMUL_MODE_REAL : cs_l
1415 ? X86EMUL_MODE_PROT64 : cs_db
1416 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1418 if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1419 vcpu->emulate_ctxt.cs_base = 0;
1420 vcpu->emulate_ctxt.ds_base = 0;
1421 vcpu->emulate_ctxt.es_base = 0;
1422 vcpu->emulate_ctxt.ss_base = 0;
1424 vcpu->emulate_ctxt.cs_base =
1425 get_segment_base(vcpu, VCPU_SREG_CS);
1426 vcpu->emulate_ctxt.ds_base =
1427 get_segment_base(vcpu, VCPU_SREG_DS);
1428 vcpu->emulate_ctxt.es_base =
1429 get_segment_base(vcpu, VCPU_SREG_ES);
1430 vcpu->emulate_ctxt.ss_base =
1431 get_segment_base(vcpu, VCPU_SREG_SS);
1434 vcpu->emulate_ctxt.gs_base =
1435 get_segment_base(vcpu, VCPU_SREG_GS);
1436 vcpu->emulate_ctxt.fs_base =
1437 get_segment_base(vcpu, VCPU_SREG_FS);
1439 r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
1441 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1442 return EMULATE_DONE;
1443 return EMULATE_FAIL;
1447 r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops);
1449 if (vcpu->pio.string)
1450 return EMULATE_DO_MMIO;
1452 if ((r || vcpu->mmio_is_write) && run) {
1453 run->exit_reason = KVM_EXIT_MMIO;
1454 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1455 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1456 run->mmio.len = vcpu->mmio_size;
1457 run->mmio.is_write = vcpu->mmio_is_write;
1461 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1462 return EMULATE_DONE;
1463 if (!vcpu->mmio_needed) {
1464 kvm_report_emulation_failure(vcpu, "mmio");
1465 return EMULATE_FAIL;
1467 return EMULATE_DO_MMIO;
1470 kvm_x86_ops->decache_regs(vcpu);
1471 kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags);
1473 if (vcpu->mmio_is_write) {
1474 vcpu->mmio_needed = 0;
1475 return EMULATE_DO_MMIO;
1478 return EMULATE_DONE;
1480 EXPORT_SYMBOL_GPL(emulate_instruction);
1483 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1485 static void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1487 DECLARE_WAITQUEUE(wait, current);
1489 add_wait_queue(&vcpu->wq, &wait);
1492 * We will block until either an interrupt or a signal wakes us up
1494 while (!kvm_cpu_has_interrupt(vcpu)
1495 && !signal_pending(current)
1496 && vcpu->mp_state != VCPU_MP_STATE_RUNNABLE
1497 && vcpu->mp_state != VCPU_MP_STATE_SIPI_RECEIVED) {
1498 set_current_state(TASK_INTERRUPTIBLE);
1504 __set_current_state(TASK_RUNNING);
1505 remove_wait_queue(&vcpu->wq, &wait);
1508 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1510 ++vcpu->stat.halt_exits;
1511 if (irqchip_in_kernel(vcpu->kvm)) {
1512 vcpu->mp_state = VCPU_MP_STATE_HALTED;
1513 kvm_vcpu_block(vcpu);
1514 if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE)
1518 vcpu->run->exit_reason = KVM_EXIT_HLT;
1522 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1524 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
1526 unsigned long nr, a0, a1, a2, a3, ret;
1528 kvm_x86_ops->cache_regs(vcpu);
1530 nr = vcpu->regs[VCPU_REGS_RAX];
1531 a0 = vcpu->regs[VCPU_REGS_RBX];
1532 a1 = vcpu->regs[VCPU_REGS_RCX];
1533 a2 = vcpu->regs[VCPU_REGS_RDX];
1534 a3 = vcpu->regs[VCPU_REGS_RSI];
1536 if (!is_long_mode(vcpu)) {
1549 vcpu->regs[VCPU_REGS_RAX] = ret;
1550 kvm_x86_ops->decache_regs(vcpu);
1553 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
1555 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
1557 char instruction[3];
1560 mutex_lock(&vcpu->kvm->lock);
1563 * Blow out the MMU to ensure that no other VCPU has an active mapping
1564 * to ensure that the updated hypercall appears atomically across all
1567 kvm_mmu_zap_all(vcpu->kvm);
1569 kvm_x86_ops->cache_regs(vcpu);
1570 kvm_x86_ops->patch_hypercall(vcpu, instruction);
1571 if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu)
1572 != X86EMUL_CONTINUE)
1575 mutex_unlock(&vcpu->kvm->lock);
1580 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1582 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1585 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1587 struct descriptor_table dt = { limit, base };
1589 kvm_x86_ops->set_gdt(vcpu, &dt);
1592 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1594 struct descriptor_table dt = { limit, base };
1596 kvm_x86_ops->set_idt(vcpu, &dt);
1599 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1600 unsigned long *rflags)
1603 *rflags = kvm_x86_ops->get_rflags(vcpu);
1606 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1608 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
1619 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1624 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1625 unsigned long *rflags)
1629 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1630 *rflags = kvm_x86_ops->get_rflags(vcpu);
1639 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1642 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1646 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1651 case 0xc0010010: /* SYSCFG */
1652 case 0xc0010015: /* HWCR */
1653 case MSR_IA32_PLATFORM_ID:
1654 case MSR_IA32_P5_MC_ADDR:
1655 case MSR_IA32_P5_MC_TYPE:
1656 case MSR_IA32_MC0_CTL:
1657 case MSR_IA32_MCG_STATUS:
1658 case MSR_IA32_MCG_CAP:
1659 case MSR_IA32_MC0_MISC:
1660 case MSR_IA32_MC0_MISC+4:
1661 case MSR_IA32_MC0_MISC+8:
1662 case MSR_IA32_MC0_MISC+12:
1663 case MSR_IA32_MC0_MISC+16:
1664 case MSR_IA32_UCODE_REV:
1665 case MSR_IA32_PERF_STATUS:
1666 case MSR_IA32_EBL_CR_POWERON:
1667 /* MTRR registers */
1669 case 0x200 ... 0x2ff:
1672 case 0xcd: /* fsb frequency */
1675 case MSR_IA32_APICBASE:
1676 data = kvm_get_apic_base(vcpu);
1678 case MSR_IA32_MISC_ENABLE:
1679 data = vcpu->ia32_misc_enable_msr;
1681 #ifdef CONFIG_X86_64
1683 data = vcpu->shadow_efer;
1687 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1693 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1696 * Reads an msr value (of 'msr_index') into 'pdata'.
1697 * Returns 0 on success, non-0 otherwise.
1698 * Assumes vcpu_load() was already called.
1700 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1702 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1705 #ifdef CONFIG_X86_64
1707 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1709 if (efer & EFER_RESERVED_BITS) {
1710 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1717 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1718 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1723 kvm_x86_ops->set_efer(vcpu, efer);
1726 efer |= vcpu->shadow_efer & EFER_LMA;
1728 vcpu->shadow_efer = efer;
1733 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1736 #ifdef CONFIG_X86_64
1738 set_efer(vcpu, data);
1741 case MSR_IA32_MC0_STATUS:
1742 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1743 __FUNCTION__, data);
1745 case MSR_IA32_MCG_STATUS:
1746 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1747 __FUNCTION__, data);
1749 case MSR_IA32_UCODE_REV:
1750 case MSR_IA32_UCODE_WRITE:
1751 case 0x200 ... 0x2ff: /* MTRRs */
1753 case MSR_IA32_APICBASE:
1754 kvm_set_apic_base(vcpu, data);
1756 case MSR_IA32_MISC_ENABLE:
1757 vcpu->ia32_misc_enable_msr = data;
1760 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
1765 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1768 * Writes msr value into into the appropriate "register".
1769 * Returns 0 on success, non-0 otherwise.
1770 * Assumes vcpu_load() was already called.
1772 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1774 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
1777 void kvm_resched(struct kvm_vcpu *vcpu)
1779 if (!need_resched())
1783 EXPORT_SYMBOL_GPL(kvm_resched);
1785 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1789 struct kvm_cpuid_entry *e, *best;
1791 kvm_x86_ops->cache_regs(vcpu);
1792 function = vcpu->regs[VCPU_REGS_RAX];
1793 vcpu->regs[VCPU_REGS_RAX] = 0;
1794 vcpu->regs[VCPU_REGS_RBX] = 0;
1795 vcpu->regs[VCPU_REGS_RCX] = 0;
1796 vcpu->regs[VCPU_REGS_RDX] = 0;
1798 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1799 e = &vcpu->cpuid_entries[i];
1800 if (e->function == function) {
1805 * Both basic or both extended?
1807 if (((e->function ^ function) & 0x80000000) == 0)
1808 if (!best || e->function > best->function)
1812 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1813 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1814 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1815 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1817 kvm_x86_ops->decache_regs(vcpu);
1818 kvm_x86_ops->skip_emulated_instruction(vcpu);
1820 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1822 static int pio_copy_data(struct kvm_vcpu *vcpu)
1824 void *p = vcpu->pio_data;
1827 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1829 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1832 free_pio_guest_pages(vcpu);
1835 q += vcpu->pio.guest_page_offset;
1836 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1838 memcpy(q, p, bytes);
1840 memcpy(p, q, bytes);
1841 q -= vcpu->pio.guest_page_offset;
1843 free_pio_guest_pages(vcpu);
1847 static int complete_pio(struct kvm_vcpu *vcpu)
1849 struct kvm_pio_request *io = &vcpu->pio;
1853 kvm_x86_ops->cache_regs(vcpu);
1857 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1861 r = pio_copy_data(vcpu);
1863 kvm_x86_ops->cache_regs(vcpu);
1870 delta *= io->cur_count;
1872 * The size of the register should really depend on
1873 * current address size.
1875 vcpu->regs[VCPU_REGS_RCX] -= delta;
1881 vcpu->regs[VCPU_REGS_RDI] += delta;
1883 vcpu->regs[VCPU_REGS_RSI] += delta;
1886 kvm_x86_ops->decache_regs(vcpu);
1888 io->count -= io->cur_count;
1894 static void kernel_pio(struct kvm_io_device *pio_dev,
1895 struct kvm_vcpu *vcpu,
1898 /* TODO: String I/O for in kernel device */
1900 mutex_lock(&vcpu->kvm->lock);
1902 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1906 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1909 mutex_unlock(&vcpu->kvm->lock);
1912 static void pio_string_write(struct kvm_io_device *pio_dev,
1913 struct kvm_vcpu *vcpu)
1915 struct kvm_pio_request *io = &vcpu->pio;
1916 void *pd = vcpu->pio_data;
1919 mutex_lock(&vcpu->kvm->lock);
1920 for (i = 0; i < io->cur_count; i++) {
1921 kvm_iodevice_write(pio_dev, io->port,
1926 mutex_unlock(&vcpu->kvm->lock);
1929 int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1930 int size, unsigned port)
1932 struct kvm_io_device *pio_dev;
1934 vcpu->run->exit_reason = KVM_EXIT_IO;
1935 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1936 vcpu->run->io.size = vcpu->pio.size = size;
1937 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1938 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
1939 vcpu->run->io.port = vcpu->pio.port = port;
1941 vcpu->pio.string = 0;
1943 vcpu->pio.guest_page_offset = 0;
1946 kvm_x86_ops->cache_regs(vcpu);
1947 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1948 kvm_x86_ops->decache_regs(vcpu);
1950 kvm_x86_ops->skip_emulated_instruction(vcpu);
1952 pio_dev = vcpu_find_pio_dev(vcpu, port);
1954 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1960 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
1962 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1963 int size, unsigned long count, int down,
1964 gva_t address, int rep, unsigned port)
1966 unsigned now, in_page;
1970 struct kvm_io_device *pio_dev;
1972 vcpu->run->exit_reason = KVM_EXIT_IO;
1973 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1974 vcpu->run->io.size = vcpu->pio.size = size;
1975 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1976 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
1977 vcpu->run->io.port = vcpu->pio.port = port;
1979 vcpu->pio.string = 1;
1980 vcpu->pio.down = down;
1981 vcpu->pio.guest_page_offset = offset_in_page(address);
1982 vcpu->pio.rep = rep;
1985 kvm_x86_ops->skip_emulated_instruction(vcpu);
1990 in_page = PAGE_SIZE - offset_in_page(address);
1992 in_page = offset_in_page(address) + size;
1993 now = min(count, (unsigned long)in_page / size);
1996 * String I/O straddles page boundary. Pin two guest pages
1997 * so that we satisfy atomicity constraints. Do just one
1998 * transaction to avoid complexity.
2005 * String I/O in reverse. Yuck. Kill the guest, fix later.
2007 pr_unimpl(vcpu, "guest string pio down\n");
2011 vcpu->run->io.count = now;
2012 vcpu->pio.cur_count = now;
2014 if (vcpu->pio.cur_count == vcpu->pio.count)
2015 kvm_x86_ops->skip_emulated_instruction(vcpu);
2017 for (i = 0; i < nr_pages; ++i) {
2018 mutex_lock(&vcpu->kvm->lock);
2019 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
2022 vcpu->pio.guest_pages[i] = page;
2023 mutex_unlock(&vcpu->kvm->lock);
2026 free_pio_guest_pages(vcpu);
2031 pio_dev = vcpu_find_pio_dev(vcpu, port);
2032 if (!vcpu->pio.in) {
2033 /* string PIO write */
2034 ret = pio_copy_data(vcpu);
2035 if (ret >= 0 && pio_dev) {
2036 pio_string_write(pio_dev, vcpu);
2038 if (vcpu->pio.count == 0)
2042 pr_unimpl(vcpu, "no string pio read support yet, "
2043 "port %x size %d count %ld\n",
2048 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
2051 * Check if userspace requested an interrupt window, and that the
2052 * interrupt window is open.
2054 * No need to exit to userspace if we already have an interrupt queued.
2056 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
2057 struct kvm_run *kvm_run)
2059 return (!vcpu->irq_summary &&
2060 kvm_run->request_interrupt_window &&
2061 vcpu->interrupt_window_open &&
2062 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
2065 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
2066 struct kvm_run *kvm_run)
2068 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
2069 kvm_run->cr8 = get_cr8(vcpu);
2070 kvm_run->apic_base = kvm_get_apic_base(vcpu);
2071 if (irqchip_in_kernel(vcpu->kvm))
2072 kvm_run->ready_for_interrupt_injection = 1;
2074 kvm_run->ready_for_interrupt_injection =
2075 (vcpu->interrupt_window_open &&
2076 vcpu->irq_summary == 0);
2079 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2083 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
2084 printk("vcpu %d received sipi with vector # %x\n",
2085 vcpu->vcpu_id, vcpu->sipi_vector);
2086 kvm_lapic_reset(vcpu);
2087 kvm_x86_ops->vcpu_reset(vcpu);
2088 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
2092 if (vcpu->guest_debug.enabled)
2093 kvm_x86_ops->guest_debug_pre(vcpu);
2096 r = kvm_mmu_reload(vcpu);
2102 kvm_x86_ops->prepare_guest_switch(vcpu);
2103 kvm_load_guest_fpu(vcpu);
2105 local_irq_disable();
2107 if (signal_pending(current)) {
2111 kvm_run->exit_reason = KVM_EXIT_INTR;
2112 ++vcpu->stat.signal_exits;
2116 if (irqchip_in_kernel(vcpu->kvm))
2117 kvm_x86_ops->inject_pending_irq(vcpu);
2118 else if (!vcpu->mmio_read_completed)
2119 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
2121 vcpu->guest_mode = 1;
2125 if (test_and_clear_bit(KVM_TLB_FLUSH, &vcpu->requests))
2126 kvm_x86_ops->tlb_flush(vcpu);
2128 kvm_x86_ops->run(vcpu, kvm_run);
2130 vcpu->guest_mode = 0;
2136 * We must have an instruction between local_irq_enable() and
2137 * kvm_guest_exit(), so the timer interrupt isn't delayed by
2138 * the interrupt shadow. The stat.exits increment will do nicely.
2139 * But we need to prevent reordering, hence this barrier():
2148 * Profile KVM exit RIPs:
2150 if (unlikely(prof_on == KVM_PROFILING)) {
2151 kvm_x86_ops->cache_regs(vcpu);
2152 profile_hit(KVM_PROFILING, (void *)vcpu->rip);
2155 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2158 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2160 kvm_run->exit_reason = KVM_EXIT_INTR;
2161 ++vcpu->stat.request_irq_exits;
2164 if (!need_resched()) {
2165 ++vcpu->stat.light_exits;
2176 post_kvm_run_save(vcpu, kvm_run);
2182 static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2189 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
2190 kvm_vcpu_block(vcpu);
2195 if (vcpu->sigset_active)
2196 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2198 /* re-sync apic's tpr */
2199 if (!irqchip_in_kernel(vcpu->kvm))
2200 set_cr8(vcpu, kvm_run->cr8);
2202 if (vcpu->pio.cur_count) {
2203 r = complete_pio(vcpu);
2208 if (vcpu->mmio_needed) {
2209 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2210 vcpu->mmio_read_completed = 1;
2211 vcpu->mmio_needed = 0;
2212 r = emulate_instruction(vcpu, kvm_run,
2213 vcpu->mmio_fault_cr2, 0, 1);
2214 if (r == EMULATE_DO_MMIO) {
2216 * Read-modify-write. Back to userspace.
2223 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2224 kvm_x86_ops->cache_regs(vcpu);
2225 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2226 kvm_x86_ops->decache_regs(vcpu);
2229 r = __vcpu_run(vcpu, kvm_run);
2232 if (vcpu->sigset_active)
2233 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2239 static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
2240 struct kvm_regs *regs)
2244 kvm_x86_ops->cache_regs(vcpu);
2246 regs->rax = vcpu->regs[VCPU_REGS_RAX];
2247 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
2248 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
2249 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
2250 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
2251 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
2252 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
2253 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
2254 #ifdef CONFIG_X86_64
2255 regs->r8 = vcpu->regs[VCPU_REGS_R8];
2256 regs->r9 = vcpu->regs[VCPU_REGS_R9];
2257 regs->r10 = vcpu->regs[VCPU_REGS_R10];
2258 regs->r11 = vcpu->regs[VCPU_REGS_R11];
2259 regs->r12 = vcpu->regs[VCPU_REGS_R12];
2260 regs->r13 = vcpu->regs[VCPU_REGS_R13];
2261 regs->r14 = vcpu->regs[VCPU_REGS_R14];
2262 regs->r15 = vcpu->regs[VCPU_REGS_R15];
2265 regs->rip = vcpu->rip;
2266 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2269 * Don't leak debug flags in case they were set for guest debugging
2271 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2272 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2279 static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
2280 struct kvm_regs *regs)
2284 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2285 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2286 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2287 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2288 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2289 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2290 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2291 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
2292 #ifdef CONFIG_X86_64
2293 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2294 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2295 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2296 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2297 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2298 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2299 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2300 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2303 vcpu->rip = regs->rip;
2304 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
2306 kvm_x86_ops->decache_regs(vcpu);
2313 static void get_segment(struct kvm_vcpu *vcpu,
2314 struct kvm_segment *var, int seg)
2316 return kvm_x86_ops->get_segment(vcpu, var, seg);
2319 static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2320 struct kvm_sregs *sregs)
2322 struct descriptor_table dt;
2327 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2328 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2329 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2330 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2331 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2332 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2334 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2335 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2337 kvm_x86_ops->get_idt(vcpu, &dt);
2338 sregs->idt.limit = dt.limit;
2339 sregs->idt.base = dt.base;
2340 kvm_x86_ops->get_gdt(vcpu, &dt);
2341 sregs->gdt.limit = dt.limit;
2342 sregs->gdt.base = dt.base;
2344 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2345 sregs->cr0 = vcpu->cr0;
2346 sregs->cr2 = vcpu->cr2;
2347 sregs->cr3 = vcpu->cr3;
2348 sregs->cr4 = vcpu->cr4;
2349 sregs->cr8 = get_cr8(vcpu);
2350 sregs->efer = vcpu->shadow_efer;
2351 sregs->apic_base = kvm_get_apic_base(vcpu);
2353 if (irqchip_in_kernel(vcpu->kvm)) {
2354 memset(sregs->interrupt_bitmap, 0,
2355 sizeof sregs->interrupt_bitmap);
2356 pending_vec = kvm_x86_ops->get_irq(vcpu);
2357 if (pending_vec >= 0)
2358 set_bit(pending_vec, (unsigned long *)sregs->interrupt_bitmap);
2360 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2361 sizeof sregs->interrupt_bitmap);
2368 static void set_segment(struct kvm_vcpu *vcpu,
2369 struct kvm_segment *var, int seg)
2371 return kvm_x86_ops->set_segment(vcpu, var, seg);
2374 static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2375 struct kvm_sregs *sregs)
2377 int mmu_reset_needed = 0;
2378 int i, pending_vec, max_bits;
2379 struct descriptor_table dt;
2383 dt.limit = sregs->idt.limit;
2384 dt.base = sregs->idt.base;
2385 kvm_x86_ops->set_idt(vcpu, &dt);
2386 dt.limit = sregs->gdt.limit;
2387 dt.base = sregs->gdt.base;
2388 kvm_x86_ops->set_gdt(vcpu, &dt);
2390 vcpu->cr2 = sregs->cr2;
2391 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2392 vcpu->cr3 = sregs->cr3;
2394 set_cr8(vcpu, sregs->cr8);
2396 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2397 #ifdef CONFIG_X86_64
2398 kvm_x86_ops->set_efer(vcpu, sregs->efer);
2400 kvm_set_apic_base(vcpu, sregs->apic_base);
2402 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2404 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2405 vcpu->cr0 = sregs->cr0;
2406 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
2408 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2409 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
2410 if (!is_long_mode(vcpu) && is_pae(vcpu))
2411 load_pdptrs(vcpu, vcpu->cr3);
2413 if (mmu_reset_needed)
2414 kvm_mmu_reset_context(vcpu);
2416 if (!irqchip_in_kernel(vcpu->kvm)) {
2417 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2418 sizeof vcpu->irq_pending);
2419 vcpu->irq_summary = 0;
2420 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2421 if (vcpu->irq_pending[i])
2422 __set_bit(i, &vcpu->irq_summary);
2424 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2425 pending_vec = find_first_bit(
2426 (const unsigned long *)sregs->interrupt_bitmap,
2428 /* Only pending external irq is handled here */
2429 if (pending_vec < max_bits) {
2430 kvm_x86_ops->set_irq(vcpu, pending_vec);
2431 printk("Set back pending irq %d\n", pending_vec);
2435 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2436 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2437 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2438 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2439 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2440 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2442 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2443 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2450 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2452 struct kvm_segment cs;
2454 get_segment(vcpu, &cs, VCPU_SREG_CS);
2458 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
2461 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2462 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
2464 * This list is modified at module load time to reflect the
2465 * capabilities of the host cpu.
2467 static u32 msrs_to_save[] = {
2468 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2470 #ifdef CONFIG_X86_64
2471 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2473 MSR_IA32_TIME_STAMP_COUNTER,
2476 static unsigned num_msrs_to_save;
2478 static u32 emulated_msrs[] = {
2479 MSR_IA32_MISC_ENABLE,
2482 static __init void kvm_init_msr_list(void)
2487 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2488 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2491 msrs_to_save[j] = msrs_to_save[i];
2494 num_msrs_to_save = j;
2498 * Adapt set_msr() to msr_io()'s calling convention
2500 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2502 return kvm_set_msr(vcpu, index, *data);
2506 * Read or write a bunch of msrs. All parameters are kernel addresses.
2508 * @return number of msrs set successfully.
2510 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2511 struct kvm_msr_entry *entries,
2512 int (*do_msr)(struct kvm_vcpu *vcpu,
2513 unsigned index, u64 *data))
2519 for (i = 0; i < msrs->nmsrs; ++i)
2520 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2529 * Read or write a bunch of msrs. Parameters are user addresses.
2531 * @return number of msrs set successfully.
2533 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2534 int (*do_msr)(struct kvm_vcpu *vcpu,
2535 unsigned index, u64 *data),
2538 struct kvm_msrs msrs;
2539 struct kvm_msr_entry *entries;
2544 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2548 if (msrs.nmsrs >= MAX_IO_MSRS)
2552 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2553 entries = vmalloc(size);
2558 if (copy_from_user(entries, user_msrs->entries, size))
2561 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2566 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2578 * Translate a guest virtual address to a guest physical address.
2580 static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2581 struct kvm_translation *tr)
2583 unsigned long vaddr = tr->linear_address;
2587 mutex_lock(&vcpu->kvm->lock);
2588 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2589 tr->physical_address = gpa;
2590 tr->valid = gpa != UNMAPPED_GVA;
2593 mutex_unlock(&vcpu->kvm->lock);
2599 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2600 struct kvm_interrupt *irq)
2602 if (irq->irq < 0 || irq->irq >= 256)
2604 if (irqchip_in_kernel(vcpu->kvm))
2608 set_bit(irq->irq, vcpu->irq_pending);
2609 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2616 static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2617 struct kvm_debug_guest *dbg)
2623 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
2630 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2631 unsigned long address,
2634 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2635 unsigned long pgoff;
2638 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2640 page = virt_to_page(vcpu->run);
2641 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2642 page = virt_to_page(vcpu->pio_data);
2644 return NOPAGE_SIGBUS;
2647 *type = VM_FAULT_MINOR;
2652 static struct vm_operations_struct kvm_vcpu_vm_ops = {
2653 .nopage = kvm_vcpu_nopage,
2656 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2658 vma->vm_ops = &kvm_vcpu_vm_ops;
2662 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2664 struct kvm_vcpu *vcpu = filp->private_data;
2666 fput(vcpu->kvm->filp);
2670 static struct file_operations kvm_vcpu_fops = {
2671 .release = kvm_vcpu_release,
2672 .unlocked_ioctl = kvm_vcpu_ioctl,
2673 .compat_ioctl = kvm_vcpu_ioctl,
2674 .mmap = kvm_vcpu_mmap,
2678 * Allocates an inode for the vcpu.
2680 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2683 struct inode *inode;
2686 r = anon_inode_getfd(&fd, &inode, &file,
2687 "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2690 atomic_inc(&vcpu->kvm->filp->f_count);
2695 * Creates some virtual cpus. Good luck creating more than one.
2697 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2700 struct kvm_vcpu *vcpu;
2705 vcpu = kvm_x86_ops->vcpu_create(kvm, n);
2707 return PTR_ERR(vcpu);
2709 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2711 /* We do fxsave: this must be aligned. */
2712 BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2715 r = kvm_mmu_setup(vcpu);
2720 mutex_lock(&kvm->lock);
2721 if (kvm->vcpus[n]) {
2723 mutex_unlock(&kvm->lock);
2726 kvm->vcpus[n] = vcpu;
2727 mutex_unlock(&kvm->lock);
2729 /* Now it's all set up, let userspace reach it */
2730 r = create_vcpu_fd(vcpu);
2736 mutex_lock(&kvm->lock);
2737 kvm->vcpus[n] = NULL;
2738 mutex_unlock(&kvm->lock);
2742 kvm_mmu_unload(vcpu);
2746 kvm_x86_ops->vcpu_free(vcpu);
2750 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2754 struct kvm_cpuid_entry *e, *entry;
2756 rdmsrl(MSR_EFER, efer);
2758 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2759 e = &vcpu->cpuid_entries[i];
2760 if (e->function == 0x80000001) {
2765 if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
2766 entry->edx &= ~(1 << 20);
2767 printk(KERN_INFO "kvm: guest NX capability removed\n");
2771 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2772 struct kvm_cpuid *cpuid,
2773 struct kvm_cpuid_entry __user *entries)
2778 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2781 if (copy_from_user(&vcpu->cpuid_entries, entries,
2782 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2784 vcpu->cpuid_nent = cpuid->nent;
2785 cpuid_fix_nx_cap(vcpu);
2792 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2795 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2796 vcpu->sigset_active = 1;
2797 vcpu->sigset = *sigset;
2799 vcpu->sigset_active = 0;
2804 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2805 * we have asm/x86/processor.h
2816 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2817 #ifdef CONFIG_X86_64
2818 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2820 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2824 static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2826 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2830 memcpy(fpu->fpr, fxsave->st_space, 128);
2831 fpu->fcw = fxsave->cwd;
2832 fpu->fsw = fxsave->swd;
2833 fpu->ftwx = fxsave->twd;
2834 fpu->last_opcode = fxsave->fop;
2835 fpu->last_ip = fxsave->rip;
2836 fpu->last_dp = fxsave->rdp;
2837 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2844 static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2846 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2850 memcpy(fxsave->st_space, fpu->fpr, 128);
2851 fxsave->cwd = fpu->fcw;
2852 fxsave->swd = fpu->fsw;
2853 fxsave->twd = fpu->ftwx;
2854 fxsave->fop = fpu->last_opcode;
2855 fxsave->rip = fpu->last_ip;
2856 fxsave->rdp = fpu->last_dp;
2857 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2864 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2865 struct kvm_lapic_state *s)
2868 memcpy(s->regs, vcpu->apic->regs, sizeof *s);
2874 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2875 struct kvm_lapic_state *s)
2878 memcpy(vcpu->apic->regs, s->regs, sizeof *s);
2879 kvm_apic_post_state_restore(vcpu);
2885 static long kvm_vcpu_ioctl(struct file *filp,
2886 unsigned int ioctl, unsigned long arg)
2888 struct kvm_vcpu *vcpu = filp->private_data;
2889 void __user *argp = (void __user *)arg;
2897 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
2899 case KVM_GET_REGS: {
2900 struct kvm_regs kvm_regs;
2902 memset(&kvm_regs, 0, sizeof kvm_regs);
2903 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
2907 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
2912 case KVM_SET_REGS: {
2913 struct kvm_regs kvm_regs;
2916 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
2918 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
2924 case KVM_GET_SREGS: {
2925 struct kvm_sregs kvm_sregs;
2927 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2928 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
2932 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
2937 case KVM_SET_SREGS: {
2938 struct kvm_sregs kvm_sregs;
2941 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
2943 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
2949 case KVM_TRANSLATE: {
2950 struct kvm_translation tr;
2953 if (copy_from_user(&tr, argp, sizeof tr))
2955 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
2959 if (copy_to_user(argp, &tr, sizeof tr))
2964 case KVM_INTERRUPT: {
2965 struct kvm_interrupt irq;
2968 if (copy_from_user(&irq, argp, sizeof irq))
2970 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2976 case KVM_DEBUG_GUEST: {
2977 struct kvm_debug_guest dbg;
2980 if (copy_from_user(&dbg, argp, sizeof dbg))
2982 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
2989 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2992 r = msr_io(vcpu, argp, do_set_msr, 0);
2994 case KVM_SET_CPUID: {
2995 struct kvm_cpuid __user *cpuid_arg = argp;
2996 struct kvm_cpuid cpuid;
2999 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
3001 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
3006 case KVM_SET_SIGNAL_MASK: {
3007 struct kvm_signal_mask __user *sigmask_arg = argp;
3008 struct kvm_signal_mask kvm_sigmask;
3009 sigset_t sigset, *p;
3014 if (copy_from_user(&kvm_sigmask, argp,
3015 sizeof kvm_sigmask))
3018 if (kvm_sigmask.len != sizeof sigset)
3021 if (copy_from_user(&sigset, sigmask_arg->sigset,
3026 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
3032 memset(&fpu, 0, sizeof fpu);
3033 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
3037 if (copy_to_user(argp, &fpu, sizeof fpu))
3046 if (copy_from_user(&fpu, argp, sizeof fpu))
3048 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
3054 case KVM_GET_LAPIC: {
3055 struct kvm_lapic_state lapic;
3057 memset(&lapic, 0, sizeof lapic);
3058 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
3062 if (copy_to_user(argp, &lapic, sizeof lapic))
3067 case KVM_SET_LAPIC: {
3068 struct kvm_lapic_state lapic;
3071 if (copy_from_user(&lapic, argp, sizeof lapic))
3073 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
3086 static long kvm_vm_ioctl(struct file *filp,
3087 unsigned int ioctl, unsigned long arg)
3089 struct kvm *kvm = filp->private_data;
3090 void __user *argp = (void __user *)arg;
3094 case KVM_CREATE_VCPU:
3095 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
3099 case KVM_SET_MEMORY_REGION: {
3100 struct kvm_memory_region kvm_mem;
3103 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
3105 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
3110 case KVM_SET_NR_MMU_PAGES:
3111 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
3115 case KVM_GET_NR_MMU_PAGES:
3116 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
3118 case KVM_GET_DIRTY_LOG: {
3119 struct kvm_dirty_log log;
3122 if (copy_from_user(&log, argp, sizeof log))
3124 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3129 case KVM_SET_MEMORY_ALIAS: {
3130 struct kvm_memory_alias alias;
3133 if (copy_from_user(&alias, argp, sizeof alias))
3135 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
3140 case KVM_CREATE_IRQCHIP:
3142 kvm->vpic = kvm_create_pic(kvm);
3144 r = kvm_ioapic_init(kvm);
3154 case KVM_IRQ_LINE: {
3155 struct kvm_irq_level irq_event;
3158 if (copy_from_user(&irq_event, argp, sizeof irq_event))
3160 if (irqchip_in_kernel(kvm)) {
3161 mutex_lock(&kvm->lock);
3162 if (irq_event.irq < 16)
3163 kvm_pic_set_irq(pic_irqchip(kvm),
3166 kvm_ioapic_set_irq(kvm->vioapic,
3169 mutex_unlock(&kvm->lock);
3174 case KVM_GET_IRQCHIP: {
3175 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3176 struct kvm_irqchip chip;
3179 if (copy_from_user(&chip, argp, sizeof chip))
3182 if (!irqchip_in_kernel(kvm))
3184 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
3188 if (copy_to_user(argp, &chip, sizeof chip))
3193 case KVM_SET_IRQCHIP: {
3194 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3195 struct kvm_irqchip chip;
3198 if (copy_from_user(&chip, argp, sizeof chip))
3201 if (!irqchip_in_kernel(kvm))
3203 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
3216 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
3217 unsigned long address,
3220 struct kvm *kvm = vma->vm_file->private_data;
3221 unsigned long pgoff;
3224 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
3225 page = gfn_to_page(kvm, pgoff);
3227 return NOPAGE_SIGBUS;
3230 *type = VM_FAULT_MINOR;
3235 static struct vm_operations_struct kvm_vm_vm_ops = {
3236 .nopage = kvm_vm_nopage,
3239 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
3241 vma->vm_ops = &kvm_vm_vm_ops;
3245 static struct file_operations kvm_vm_fops = {
3246 .release = kvm_vm_release,
3247 .unlocked_ioctl = kvm_vm_ioctl,
3248 .compat_ioctl = kvm_vm_ioctl,
3249 .mmap = kvm_vm_mmap,
3252 static int kvm_dev_ioctl_create_vm(void)
3255 struct inode *inode;
3259 kvm = kvm_create_vm();
3261 return PTR_ERR(kvm);
3262 r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
3264 kvm_destroy_vm(kvm);
3273 static long kvm_dev_ioctl(struct file *filp,
3274 unsigned int ioctl, unsigned long arg)
3276 void __user *argp = (void __user *)arg;
3280 case KVM_GET_API_VERSION:
3284 r = KVM_API_VERSION;
3290 r = kvm_dev_ioctl_create_vm();
3292 case KVM_GET_MSR_INDEX_LIST: {
3293 struct kvm_msr_list __user *user_msr_list = argp;
3294 struct kvm_msr_list msr_list;
3298 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
3301 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
3302 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
3305 if (n < num_msrs_to_save)
3308 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
3309 num_msrs_to_save * sizeof(u32)))
3311 if (copy_to_user(user_msr_list->indices
3312 + num_msrs_to_save * sizeof(u32),
3314 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
3319 case KVM_CHECK_EXTENSION: {
3320 int ext = (long)argp;
3323 case KVM_CAP_IRQCHIP:
3325 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
3334 case KVM_GET_VCPU_MMAP_SIZE:
3347 static struct file_operations kvm_chardev_ops = {
3348 .unlocked_ioctl = kvm_dev_ioctl,
3349 .compat_ioctl = kvm_dev_ioctl,
3352 static struct miscdevice kvm_dev = {
3359 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
3362 static void decache_vcpus_on_cpu(int cpu)
3365 struct kvm_vcpu *vcpu;
3368 spin_lock(&kvm_lock);
3369 list_for_each_entry(vm, &vm_list, vm_list)
3370 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3371 vcpu = vm->vcpus[i];
3375 * If the vcpu is locked, then it is running on some
3376 * other cpu and therefore it is not cached on the
3379 * If it's not locked, check the last cpu it executed
3382 if (mutex_trylock(&vcpu->mutex)) {
3383 if (vcpu->cpu == cpu) {
3384 kvm_x86_ops->vcpu_decache(vcpu);
3387 mutex_unlock(&vcpu->mutex);
3390 spin_unlock(&kvm_lock);
3393 static void hardware_enable(void *junk)
3395 int cpu = raw_smp_processor_id();
3397 if (cpu_isset(cpu, cpus_hardware_enabled))
3399 cpu_set(cpu, cpus_hardware_enabled);
3400 kvm_x86_ops->hardware_enable(NULL);
3403 static void hardware_disable(void *junk)
3405 int cpu = raw_smp_processor_id();
3407 if (!cpu_isset(cpu, cpus_hardware_enabled))
3409 cpu_clear(cpu, cpus_hardware_enabled);
3410 decache_vcpus_on_cpu(cpu);
3411 kvm_x86_ops->hardware_disable(NULL);
3414 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3421 case CPU_DYING_FROZEN:
3422 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3424 hardware_disable(NULL);
3426 case CPU_UP_CANCELED:
3427 case CPU_UP_CANCELED_FROZEN:
3428 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3430 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
3433 case CPU_ONLINE_FROZEN:
3434 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
3436 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
3442 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3445 if (val == SYS_RESTART) {
3447 * Some (well, at least mine) BIOSes hang on reboot if
3450 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
3451 on_each_cpu(hardware_disable, NULL, 0, 1);
3456 static struct notifier_block kvm_reboot_notifier = {
3457 .notifier_call = kvm_reboot,
3461 void kvm_io_bus_init(struct kvm_io_bus *bus)
3463 memset(bus, 0, sizeof(*bus));
3466 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3470 for (i = 0; i < bus->dev_count; i++) {
3471 struct kvm_io_device *pos = bus->devs[i];
3473 kvm_iodevice_destructor(pos);
3477 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
3481 for (i = 0; i < bus->dev_count; i++) {
3482 struct kvm_io_device *pos = bus->devs[i];
3484 if (pos->in_range(pos, addr))
3491 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
3493 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
3495 bus->devs[bus->dev_count++] = dev;
3498 static struct notifier_block kvm_cpu_notifier = {
3499 .notifier_call = kvm_cpu_hotplug,
3500 .priority = 20, /* must be > scheduler priority */
3503 static u64 stat_get(void *_offset)
3505 unsigned offset = (long)_offset;
3508 struct kvm_vcpu *vcpu;
3511 spin_lock(&kvm_lock);
3512 list_for_each_entry(kvm, &vm_list, vm_list)
3513 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3514 vcpu = kvm->vcpus[i];
3516 total += *(u32 *)((void *)vcpu + offset);
3518 spin_unlock(&kvm_lock);
3522 DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, NULL, "%llu\n");
3524 static __init void kvm_init_debug(void)
3526 struct kvm_stats_debugfs_item *p;
3528 debugfs_dir = debugfs_create_dir("kvm", NULL);
3529 for (p = debugfs_entries; p->name; ++p)
3530 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3531 (void *)(long)p->offset,
3535 static void kvm_exit_debug(void)
3537 struct kvm_stats_debugfs_item *p;
3539 for (p = debugfs_entries; p->name; ++p)
3540 debugfs_remove(p->dentry);
3541 debugfs_remove(debugfs_dir);
3544 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3546 hardware_disable(NULL);
3550 static int kvm_resume(struct sys_device *dev)
3552 hardware_enable(NULL);
3556 static struct sysdev_class kvm_sysdev_class = {
3558 .suspend = kvm_suspend,
3559 .resume = kvm_resume,
3562 static struct sys_device kvm_sysdev = {
3564 .cls = &kvm_sysdev_class,
3567 hpa_t bad_page_address;
3570 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3572 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3575 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3577 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3579 kvm_x86_ops->vcpu_load(vcpu, cpu);
3582 static void kvm_sched_out(struct preempt_notifier *pn,
3583 struct task_struct *next)
3585 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3587 kvm_x86_ops->vcpu_put(vcpu);
3590 int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
3591 struct module *module)
3597 printk(KERN_ERR "kvm: already loaded the other module\n");
3601 if (!ops->cpu_has_kvm_support()) {
3602 printk(KERN_ERR "kvm: no hardware support\n");
3605 if (ops->disabled_by_bios()) {
3606 printk(KERN_ERR "kvm: disabled by bios\n");
3612 r = kvm_x86_ops->hardware_setup();
3616 for_each_online_cpu(cpu) {
3617 smp_call_function_single(cpu,
3618 kvm_x86_ops->check_processor_compatibility,
3624 on_each_cpu(hardware_enable, NULL, 0, 1);
3625 r = register_cpu_notifier(&kvm_cpu_notifier);
3628 register_reboot_notifier(&kvm_reboot_notifier);
3630 r = sysdev_class_register(&kvm_sysdev_class);
3634 r = sysdev_register(&kvm_sysdev);
3638 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3639 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
3640 __alignof__(struct kvm_vcpu), 0, 0);
3641 if (!kvm_vcpu_cache) {
3646 kvm_chardev_ops.owner = module;
3648 r = misc_register(&kvm_dev);
3650 printk (KERN_ERR "kvm: misc device register failed\n");
3654 kvm_preempt_ops.sched_in = kvm_sched_in;
3655 kvm_preempt_ops.sched_out = kvm_sched_out;
3657 kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
3662 kmem_cache_destroy(kvm_vcpu_cache);
3664 sysdev_unregister(&kvm_sysdev);
3666 sysdev_class_unregister(&kvm_sysdev_class);
3668 unregister_reboot_notifier(&kvm_reboot_notifier);
3669 unregister_cpu_notifier(&kvm_cpu_notifier);
3671 on_each_cpu(hardware_disable, NULL, 0, 1);
3673 kvm_x86_ops->hardware_unsetup();
3679 void kvm_exit_x86(void)
3681 misc_deregister(&kvm_dev);
3682 kmem_cache_destroy(kvm_vcpu_cache);
3683 sysdev_unregister(&kvm_sysdev);
3684 sysdev_class_unregister(&kvm_sysdev_class);
3685 unregister_reboot_notifier(&kvm_reboot_notifier);
3686 unregister_cpu_notifier(&kvm_cpu_notifier);
3687 on_each_cpu(hardware_disable, NULL, 0, 1);
3688 kvm_x86_ops->hardware_unsetup();
3692 static __init int kvm_init(void)
3694 static struct page *bad_page;
3697 r = kvm_mmu_module_init();
3703 kvm_init_msr_list();
3705 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3710 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3711 memset(__va(bad_page_address), 0, PAGE_SIZE);
3717 kvm_mmu_module_exit();
3722 static __exit void kvm_exit(void)
3725 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
3726 kvm_mmu_module_exit();
3729 module_init(kvm_init)
3730 module_exit(kvm_exit)
3732 EXPORT_SYMBOL_GPL(kvm_init_x86);
3733 EXPORT_SYMBOL_GPL(kvm_exit_x86);