| /* |
| * Kernel-based Virtual Machine driver for Linux |
| * |
| * This module enables machines with Intel VT-x extensions to run virtual |
| * machines without emulation or binary translation. |
| * |
| * Copyright (C) 2006 Qumranet, Inc. |
| * |
| * Authors: |
| * Avi Kivity <avi@qumranet.com> |
| * Yaniv Kamay <yaniv@qumranet.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include "kvm.h" |
| |
| #include <linux/kvm.h> |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <asm/processor.h> |
| #include <linux/percpu.h> |
| #include <linux/gfp.h> |
| #include <asm/msr.h> |
| #include <linux/mm.h> |
| #include <linux/miscdevice.h> |
| #include <linux/vmalloc.h> |
| #include <asm/uaccess.h> |
| #include <linux/reboot.h> |
| #include <asm/io.h> |
| #include <linux/debugfs.h> |
| #include <linux/highmem.h> |
| #include <linux/file.h> |
| #include <asm/desc.h> |
| |
| #include "x86_emulate.h" |
| #include "segment_descriptor.h" |
| |
| MODULE_AUTHOR("Qumranet"); |
| MODULE_LICENSE("GPL"); |
| |
| struct kvm_arch_ops *kvm_arch_ops; |
| struct kvm_stat kvm_stat; |
| EXPORT_SYMBOL_GPL(kvm_stat); |
| |
| static struct kvm_stats_debugfs_item { |
| const char *name; |
| u32 *data; |
| struct dentry *dentry; |
| } debugfs_entries[] = { |
| { "pf_fixed", &kvm_stat.pf_fixed }, |
| { "pf_guest", &kvm_stat.pf_guest }, |
| { "tlb_flush", &kvm_stat.tlb_flush }, |
| { "invlpg", &kvm_stat.invlpg }, |
| { "exits", &kvm_stat.exits }, |
| { "io_exits", &kvm_stat.io_exits }, |
| { "mmio_exits", &kvm_stat.mmio_exits }, |
| { "signal_exits", &kvm_stat.signal_exits }, |
| { "irq_window", &kvm_stat.irq_window_exits }, |
| { "halt_exits", &kvm_stat.halt_exits }, |
| { "request_irq", &kvm_stat.request_irq_exits }, |
| { "irq_exits", &kvm_stat.irq_exits }, |
| { 0, 0 } |
| }; |
| |
| static struct dentry *debugfs_dir; |
| |
| #define MAX_IO_MSRS 256 |
| |
| #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL |
| #define LMSW_GUEST_MASK 0x0eULL |
| #define CR4_RESEVED_BITS (~((1ULL << 11) - 1)) |
| #define CR8_RESEVED_BITS (~0x0fULL) |
| #define EFER_RESERVED_BITS 0xfffffffffffff2fe |
| |
| #ifdef CONFIG_X86_64 |
| // LDT or TSS descriptor in the GDT. 16 bytes. |
| struct segment_descriptor_64 { |
| struct segment_descriptor s; |
| u32 base_higher; |
| u32 pad_zero; |
| }; |
| |
| #endif |
| |
| unsigned long segment_base(u16 selector) |
| { |
| struct descriptor_table gdt; |
| struct segment_descriptor *d; |
| unsigned long table_base; |
| typedef unsigned long ul; |
| unsigned long v; |
| |
| if (selector == 0) |
| return 0; |
| |
| asm ("sgdt %0" : "=m"(gdt)); |
| table_base = gdt.base; |
| |
| if (selector & 4) { /* from ldt */ |
| u16 ldt_selector; |
| |
| asm ("sldt %0" : "=g"(ldt_selector)); |
| table_base = segment_base(ldt_selector); |
| } |
| d = (struct segment_descriptor *)(table_base + (selector & ~7)); |
| v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24); |
| #ifdef CONFIG_X86_64 |
| if (d->system == 0 |
| && (d->type == 2 || d->type == 9 || d->type == 11)) |
| v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32; |
| #endif |
| return v; |
| } |
| EXPORT_SYMBOL_GPL(segment_base); |
| |
| static inline int valid_vcpu(int n) |
| { |
| return likely(n >= 0 && n < KVM_MAX_VCPUS); |
| } |
| |
| int kvm_read_guest(struct kvm_vcpu *vcpu, |
| gva_t addr, |
| unsigned long size, |
| void *dest) |
| { |
| unsigned char *host_buf = dest; |
| unsigned long req_size = size; |
| |
| while (size) { |
| hpa_t paddr; |
| unsigned now; |
| unsigned offset; |
| hva_t guest_buf; |
| |
| paddr = gva_to_hpa(vcpu, addr); |
| |
| if (is_error_hpa(paddr)) |
| break; |
| |
| guest_buf = (hva_t)kmap_atomic( |
| pfn_to_page(paddr >> PAGE_SHIFT), |
| KM_USER0); |
| offset = addr & ~PAGE_MASK; |
| guest_buf |= offset; |
| now = min(size, PAGE_SIZE - offset); |
| memcpy(host_buf, (void*)guest_buf, now); |
| host_buf += now; |
| addr += now; |
| size -= now; |
| kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0); |
| } |
| return req_size - size; |
| } |
| EXPORT_SYMBOL_GPL(kvm_read_guest); |
| |
| int kvm_write_guest(struct kvm_vcpu *vcpu, |
| gva_t addr, |
| unsigned long size, |
| void *data) |
| { |
| unsigned char *host_buf = data; |
| unsigned long req_size = size; |
| |
| while (size) { |
| hpa_t paddr; |
| unsigned now; |
| unsigned offset; |
| hva_t guest_buf; |
| |
| paddr = gva_to_hpa(vcpu, addr); |
| |
| if (is_error_hpa(paddr)) |
| break; |
| |
| guest_buf = (hva_t)kmap_atomic( |
| pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0); |
| offset = addr & ~PAGE_MASK; |
| guest_buf |= offset; |
| now = min(size, PAGE_SIZE - offset); |
| memcpy((void*)guest_buf, host_buf, now); |
| host_buf += now; |
| addr += now; |
| size -= now; |
| kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0); |
| } |
| return req_size - size; |
| } |
| EXPORT_SYMBOL_GPL(kvm_write_guest); |
| |
| static int vcpu_slot(struct kvm_vcpu *vcpu) |
| { |
| return vcpu - vcpu->kvm->vcpus; |
| } |
| |
| /* |
| * Switches to specified vcpu, until a matching vcpu_put() |
| */ |
| static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot) |
| { |
| struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot]; |
| |
| mutex_lock(&vcpu->mutex); |
| if (unlikely(!vcpu->vmcs)) { |
| mutex_unlock(&vcpu->mutex); |
| return 0; |
| } |
| return kvm_arch_ops->vcpu_load(vcpu); |
| } |
| |
| static void vcpu_put(struct kvm_vcpu *vcpu) |
| { |
| kvm_arch_ops->vcpu_put(vcpu); |
| mutex_unlock(&vcpu->mutex); |
| } |
| |
| static int kvm_dev_open(struct inode *inode, struct file *filp) |
| { |
| struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); |
| int i; |
| |
| if (!kvm) |
| return -ENOMEM; |
| |
| spin_lock_init(&kvm->lock); |
| INIT_LIST_HEAD(&kvm->active_mmu_pages); |
| for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
| struct kvm_vcpu *vcpu = &kvm->vcpus[i]; |
| |
| mutex_init(&vcpu->mutex); |
| vcpu->mmu.root_hpa = INVALID_PAGE; |
| INIT_LIST_HEAD(&vcpu->free_pages); |
| } |
| filp->private_data = kvm; |
| return 0; |
| } |
| |
| /* |
| * Free any memory in @free but not in @dont. |
| */ |
| static void kvm_free_physmem_slot(struct kvm_memory_slot *free, |
| struct kvm_memory_slot *dont) |
| { |
| int i; |
| |
| if (!dont || free->phys_mem != dont->phys_mem) |
| if (free->phys_mem) { |
| for (i = 0; i < free->npages; ++i) |
| if (free->phys_mem[i]) |
| __free_page(free->phys_mem[i]); |
| vfree(free->phys_mem); |
| } |
| |
| if (!dont || free->dirty_bitmap != dont->dirty_bitmap) |
| vfree(free->dirty_bitmap); |
| |
| free->phys_mem = 0; |
| free->npages = 0; |
| free->dirty_bitmap = 0; |
| } |
| |
| static void kvm_free_physmem(struct kvm *kvm) |
| { |
| int i; |
| |
| for (i = 0; i < kvm->nmemslots; ++i) |
| kvm_free_physmem_slot(&kvm->memslots[i], 0); |
| } |
| |
| static void kvm_free_vcpu(struct kvm_vcpu *vcpu) |
| { |
| kvm_arch_ops->vcpu_free(vcpu); |
| kvm_mmu_destroy(vcpu); |
| } |
| |
| static void kvm_free_vcpus(struct kvm *kvm) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < KVM_MAX_VCPUS; ++i) |
| kvm_free_vcpu(&kvm->vcpus[i]); |
| } |
| |
| static int kvm_dev_release(struct inode *inode, struct file *filp) |
| { |
| struct kvm *kvm = filp->private_data; |
| |
| kvm_free_vcpus(kvm); |
| kvm_free_physmem(kvm); |
| kfree(kvm); |
| return 0; |
| } |
| |
| static void inject_gp(struct kvm_vcpu *vcpu) |
| { |
| kvm_arch_ops->inject_gp(vcpu, 0); |
| } |
| |
| /* |
| * Load the pae pdptrs. Return true is they are all valid. |
| */ |
| static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3) |
| { |
| gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; |
| unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; |
| int i; |
| u64 pdpte; |
| u64 *pdpt; |
| int ret; |
| struct kvm_memory_slot *memslot; |
| |
| spin_lock(&vcpu->kvm->lock); |
| memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn); |
| /* FIXME: !memslot - emulate? 0xff? */ |
| pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0); |
| |
| ret = 1; |
| for (i = 0; i < 4; ++i) { |
| pdpte = pdpt[offset + i]; |
| if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) { |
| ret = 0; |
| goto out; |
| } |
| } |
| |
| for (i = 0; i < 4; ++i) |
| vcpu->pdptrs[i] = pdpt[offset + i]; |
| |
| out: |
| kunmap_atomic(pdpt, KM_USER0); |
| spin_unlock(&vcpu->kvm->lock); |
| |
| return ret; |
| } |
| |
| void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) |
| { |
| if (cr0 & CR0_RESEVED_BITS) { |
| printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n", |
| cr0, vcpu->cr0); |
| inject_gp(vcpu); |
| return; |
| } |
| |
| if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) { |
| printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| |
| if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) { |
| printk(KERN_DEBUG "set_cr0: #GP, set PG flag " |
| "and a clear PE flag\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| |
| if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) { |
| #ifdef CONFIG_X86_64 |
| if ((vcpu->shadow_efer & EFER_LME)) { |
| int cs_db, cs_l; |
| |
| if (!is_pae(vcpu)) { |
| printk(KERN_DEBUG "set_cr0: #GP, start paging " |
| "in long mode while PAE is disabled\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); |
| if (cs_l) { |
| printk(KERN_DEBUG "set_cr0: #GP, start paging " |
| "in long mode while CS.L == 1\n"); |
| inject_gp(vcpu); |
| return; |
| |
| } |
| } else |
| #endif |
| if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) { |
| printk(KERN_DEBUG "set_cr0: #GP, pdptrs " |
| "reserved bits\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| |
| } |
| |
| kvm_arch_ops->set_cr0(vcpu, cr0); |
| vcpu->cr0 = cr0; |
| |
| spin_lock(&vcpu->kvm->lock); |
| kvm_mmu_reset_context(vcpu); |
| spin_unlock(&vcpu->kvm->lock); |
| return; |
| } |
| EXPORT_SYMBOL_GPL(set_cr0); |
| |
| void lmsw(struct kvm_vcpu *vcpu, unsigned long msw) |
| { |
| kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
| set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f)); |
| } |
| EXPORT_SYMBOL_GPL(lmsw); |
| |
| void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) |
| { |
| if (cr4 & CR4_RESEVED_BITS) { |
| printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| |
| if (is_long_mode(vcpu)) { |
| if (!(cr4 & CR4_PAE_MASK)) { |
| printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while " |
| "in long mode\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK) |
| && !load_pdptrs(vcpu, vcpu->cr3)) { |
| printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n"); |
| inject_gp(vcpu); |
| } |
| |
| if (cr4 & CR4_VMXE_MASK) { |
| printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| kvm_arch_ops->set_cr4(vcpu, cr4); |
| spin_lock(&vcpu->kvm->lock); |
| kvm_mmu_reset_context(vcpu); |
| spin_unlock(&vcpu->kvm->lock); |
| } |
| EXPORT_SYMBOL_GPL(set_cr4); |
| |
| void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) |
| { |
| if (is_long_mode(vcpu)) { |
| if ( cr3 & CR3_L_MODE_RESEVED_BITS) { |
| printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| } else { |
| if (cr3 & CR3_RESEVED_BITS) { |
| printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| if (is_paging(vcpu) && is_pae(vcpu) && |
| !load_pdptrs(vcpu, cr3)) { |
| printk(KERN_DEBUG "set_cr3: #GP, pdptrs " |
| "reserved bits\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| } |
| |
| vcpu->cr3 = cr3; |
| spin_lock(&vcpu->kvm->lock); |
| vcpu->mmu.new_cr3(vcpu); |
| spin_unlock(&vcpu->kvm->lock); |
| } |
| EXPORT_SYMBOL_GPL(set_cr3); |
| |
| void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) |
| { |
| if ( cr8 & CR8_RESEVED_BITS) { |
| printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8); |
| inject_gp(vcpu); |
| return; |
| } |
| vcpu->cr8 = cr8; |
| } |
| EXPORT_SYMBOL_GPL(set_cr8); |
| |
| void fx_init(struct kvm_vcpu *vcpu) |
| { |
| struct __attribute__ ((__packed__)) fx_image_s { |
| u16 control; //fcw |
| u16 status; //fsw |
| u16 tag; // ftw |
| u16 opcode; //fop |
| u64 ip; // fpu ip |
| u64 operand;// fpu dp |
| u32 mxcsr; |
| u32 mxcsr_mask; |
| |
| } *fx_image; |
| |
| fx_save(vcpu->host_fx_image); |
| fpu_init(); |
| fx_save(vcpu->guest_fx_image); |
| fx_restore(vcpu->host_fx_image); |
| |
| fx_image = (struct fx_image_s *)vcpu->guest_fx_image; |
| fx_image->mxcsr = 0x1f80; |
| memset(vcpu->guest_fx_image + sizeof(struct fx_image_s), |
| 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s)); |
| } |
| EXPORT_SYMBOL_GPL(fx_init); |
| |
| /* |
| * Creates some virtual cpus. Good luck creating more than one. |
| */ |
| static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n) |
| { |
| int r; |
| struct kvm_vcpu *vcpu; |
| |
| r = -EINVAL; |
| if (!valid_vcpu(n)) |
| goto out; |
| |
| vcpu = &kvm->vcpus[n]; |
| |
| mutex_lock(&vcpu->mutex); |
| |
| if (vcpu->vmcs) { |
| mutex_unlock(&vcpu->mutex); |
| return -EEXIST; |
| } |
| |
| vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf, |
| FX_IMAGE_ALIGN); |
| vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE; |
| |
| vcpu->cpu = -1; /* First load will set up TR */ |
| vcpu->kvm = kvm; |
| r = kvm_arch_ops->vcpu_create(vcpu); |
| if (r < 0) |
| goto out_free_vcpus; |
| |
| r = kvm_mmu_create(vcpu); |
| if (r < 0) |
| goto out_free_vcpus; |
| |
| kvm_arch_ops->vcpu_load(vcpu); |
| r = kvm_mmu_setup(vcpu); |
| if (r >= 0) |
| r = kvm_arch_ops->vcpu_setup(vcpu); |
| vcpu_put(vcpu); |
| |
| if (r < 0) |
| goto out_free_vcpus; |
| |
| return 0; |
| |
| out_free_vcpus: |
| kvm_free_vcpu(vcpu); |
| mutex_unlock(&vcpu->mutex); |
| out: |
| return r; |
| } |
| |
| /* |
| * Allocate some memory and give it an address in the guest physical address |
| * space. |
| * |
| * Discontiguous memory is allowed, mostly for framebuffers. |
| */ |
| static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm, |
| struct kvm_memory_region *mem) |
| { |
| int r; |
| gfn_t base_gfn; |
| unsigned long npages; |
| unsigned long i; |
| struct kvm_memory_slot *memslot; |
| struct kvm_memory_slot old, new; |
| int memory_config_version; |
| |
| r = -EINVAL; |
| /* General sanity checks */ |
| if (mem->memory_size & (PAGE_SIZE - 1)) |
| goto out; |
| if (mem->guest_phys_addr & (PAGE_SIZE - 1)) |
| goto out; |
| if (mem->slot >= KVM_MEMORY_SLOTS) |
| goto out; |
| if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) |
| goto out; |
| |
| memslot = &kvm->memslots[mem->slot]; |
| base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
| npages = mem->memory_size >> PAGE_SHIFT; |
| |
| if (!npages) |
| mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; |
| |
| raced: |
| spin_lock(&kvm->lock); |
| |
| memory_config_version = kvm->memory_config_version; |
| new = old = *memslot; |
| |
| new.base_gfn = base_gfn; |
| new.npages = npages; |
| new.flags = mem->flags; |
| |
| /* Disallow changing a memory slot's size. */ |
| r = -EINVAL; |
| if (npages && old.npages && npages != old.npages) |
| goto out_unlock; |
| |
| /* Check for overlaps */ |
| r = -EEXIST; |
| for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
| struct kvm_memory_slot *s = &kvm->memslots[i]; |
| |
| if (s == memslot) |
| continue; |
| if (!((base_gfn + npages <= s->base_gfn) || |
| (base_gfn >= s->base_gfn + s->npages))) |
| goto out_unlock; |
| } |
| /* |
| * Do memory allocations outside lock. memory_config_version will |
| * detect any races. |
| */ |
| spin_unlock(&kvm->lock); |
| |
| /* Deallocate if slot is being removed */ |
| if (!npages) |
| new.phys_mem = 0; |
| |
| /* Free page dirty bitmap if unneeded */ |
| if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) |
| new.dirty_bitmap = 0; |
| |
| r = -ENOMEM; |
| |
| /* Allocate if a slot is being created */ |
| if (npages && !new.phys_mem) { |
| new.phys_mem = vmalloc(npages * sizeof(struct page *)); |
| |
| if (!new.phys_mem) |
| goto out_free; |
| |
| memset(new.phys_mem, 0, npages * sizeof(struct page *)); |
| for (i = 0; i < npages; ++i) { |
| new.phys_mem[i] = alloc_page(GFP_HIGHUSER |
| | __GFP_ZERO); |
| if (!new.phys_mem[i]) |
| goto out_free; |
| new.phys_mem[i]->private = 0; |
| } |
| } |
| |
| /* Allocate page dirty bitmap if needed */ |
| if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { |
| unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8; |
| |
| new.dirty_bitmap = vmalloc(dirty_bytes); |
| if (!new.dirty_bitmap) |
| goto out_free; |
| memset(new.dirty_bitmap, 0, dirty_bytes); |
| } |
| |
| spin_lock(&kvm->lock); |
| |
| if (memory_config_version != kvm->memory_config_version) { |
| spin_unlock(&kvm->lock); |
| kvm_free_physmem_slot(&new, &old); |
| goto raced; |
| } |
| |
| r = -EAGAIN; |
| if (kvm->busy) |
| goto out_unlock; |
| |
| if (mem->slot >= kvm->nmemslots) |
| kvm->nmemslots = mem->slot + 1; |
| |
| *memslot = new; |
| ++kvm->memory_config_version; |
| |
| spin_unlock(&kvm->lock); |
| |
| for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
| struct kvm_vcpu *vcpu; |
| |
| vcpu = vcpu_load(kvm, i); |
| if (!vcpu) |
| continue; |
| kvm_mmu_reset_context(vcpu); |
| vcpu_put(vcpu); |
| } |
| |
| kvm_free_physmem_slot(&old, &new); |
| return 0; |
| |
| out_unlock: |
| spin_unlock(&kvm->lock); |
| out_free: |
| kvm_free_physmem_slot(&new, &old); |
| out: |
| return r; |
| } |
| |
| /* |
| * Get (and clear) the dirty memory log for a memory slot. |
| */ |
| static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm, |
| struct kvm_dirty_log *log) |
| { |
| struct kvm_memory_slot *memslot; |
| int r, i; |
| int n; |
| unsigned long any = 0; |
| |
| spin_lock(&kvm->lock); |
| |
| /* |
| * Prevent changes to guest memory configuration even while the lock |
| * is not taken. |
| */ |
| ++kvm->busy; |
| spin_unlock(&kvm->lock); |
| r = -EINVAL; |
| if (log->slot >= KVM_MEMORY_SLOTS) |
| goto out; |
| |
| memslot = &kvm->memslots[log->slot]; |
| r = -ENOENT; |
| if (!memslot->dirty_bitmap) |
| goto out; |
| |
| n = ALIGN(memslot->npages, 8) / 8; |
| |
| for (i = 0; !any && i < n; ++i) |
| any = memslot->dirty_bitmap[i]; |
| |
| r = -EFAULT; |
| if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) |
| goto out; |
| |
| |
| if (any) { |
| spin_lock(&kvm->lock); |
| kvm_mmu_slot_remove_write_access(kvm, log->slot); |
| spin_unlock(&kvm->lock); |
| memset(memslot->dirty_bitmap, 0, n); |
| for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
| struct kvm_vcpu *vcpu = vcpu_load(kvm, i); |
| |
| if (!vcpu) |
| continue; |
| kvm_arch_ops->tlb_flush(vcpu); |
| vcpu_put(vcpu); |
| } |
| } |
| |
| r = 0; |
| |
| out: |
| spin_lock(&kvm->lock); |
| --kvm->busy; |
| spin_unlock(&kvm->lock); |
| return r; |
| } |
| |
| struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
| { |
| int i; |
| |
| for (i = 0; i < kvm->nmemslots; ++i) { |
| struct kvm_memory_slot *memslot = &kvm->memslots[i]; |
| |
| if (gfn >= memslot->base_gfn |
| && gfn < memslot->base_gfn + memslot->npages) |
| return memslot; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(gfn_to_memslot); |
| |
| void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
| { |
| int i; |
| struct kvm_memory_slot *memslot = 0; |
| unsigned long rel_gfn; |
| |
| for (i = 0; i < kvm->nmemslots; ++i) { |
| memslot = &kvm->memslots[i]; |
| |
| if (gfn >= memslot->base_gfn |
| && gfn < memslot->base_gfn + memslot->npages) { |
| |
| if (!memslot || !memslot->dirty_bitmap) |
| return; |
| |
| rel_gfn = gfn - memslot->base_gfn; |
| |
| /* avoid RMW */ |
| if (!test_bit(rel_gfn, memslot->dirty_bitmap)) |
| set_bit(rel_gfn, memslot->dirty_bitmap); |
| return; |
| } |
| } |
| } |
| |
| static int emulator_read_std(unsigned long addr, |
| unsigned long *val, |
| unsigned int bytes, |
| struct x86_emulate_ctxt *ctxt) |
| { |
| struct kvm_vcpu *vcpu = ctxt->vcpu; |
| void *data = val; |
| |
| while (bytes) { |
| gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); |
| unsigned offset = addr & (PAGE_SIZE-1); |
| unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset); |
| unsigned long pfn; |
| struct kvm_memory_slot *memslot; |
| void *page; |
| |
| if (gpa == UNMAPPED_GVA) |
| return X86EMUL_PROPAGATE_FAULT; |
| pfn = gpa >> PAGE_SHIFT; |
| memslot = gfn_to_memslot(vcpu->kvm, pfn); |
| if (!memslot) |
| return X86EMUL_UNHANDLEABLE; |
| page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0); |
| |
| memcpy(data, page + offset, tocopy); |
| |
| kunmap_atomic(page, KM_USER0); |
| |
| bytes -= tocopy; |
| data += tocopy; |
| addr += tocopy; |
| } |
| |
| return X86EMUL_CONTINUE; |
| } |
| |
| static int emulator_write_std(unsigned long addr, |
| unsigned long val, |
| unsigned int bytes, |
| struct x86_emulate_ctxt *ctxt) |
| { |
| printk(KERN_ERR "emulator_write_std: addr %lx n %d\n", |
| addr, bytes); |
| return X86EMUL_UNHANDLEABLE; |
| } |
| |
| static int emulator_read_emulated(unsigned long addr, |
| unsigned long *val, |
| unsigned int bytes, |
| struct x86_emulate_ctxt *ctxt) |
| { |
| struct kvm_vcpu *vcpu = ctxt->vcpu; |
| |
| if (vcpu->mmio_read_completed) { |
| memcpy(val, vcpu->mmio_data, bytes); |
| vcpu->mmio_read_completed = 0; |
| return X86EMUL_CONTINUE; |
| } else if (emulator_read_std(addr, val, bytes, ctxt) |
| == X86EMUL_CONTINUE) |
| return X86EMUL_CONTINUE; |
| else { |
| gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); |
| if (gpa == UNMAPPED_GVA) |
| return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT; |
| vcpu->mmio_needed = 1; |
| vcpu->mmio_phys_addr = gpa; |
| vcpu->mmio_size = bytes; |
| vcpu->mmio_is_write = 0; |
| |
| return X86EMUL_UNHANDLEABLE; |
| } |
| } |
| |
| static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, |
| unsigned long val, int bytes) |
| { |
| struct kvm_memory_slot *m; |
| struct page *page; |
| void *virt; |
| |
| if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT)) |
| return 0; |
| m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT); |
| if (!m) |
| return 0; |
| page = gfn_to_page(m, gpa >> PAGE_SHIFT); |
| kvm_mmu_pre_write(vcpu, gpa, bytes); |
| virt = kmap_atomic(page, KM_USER0); |
| memcpy(virt + offset_in_page(gpa), &val, bytes); |
| kunmap_atomic(virt, KM_USER0); |
| kvm_mmu_post_write(vcpu, gpa, bytes); |
| return 1; |
| } |
| |
| static int emulator_write_emulated(unsigned long addr, |
| unsigned long val, |
| unsigned int bytes, |
| struct x86_emulate_ctxt *ctxt) |
| { |
| struct kvm_vcpu *vcpu = ctxt->vcpu; |
| gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); |
| |
| if (gpa == UNMAPPED_GVA) |
| return X86EMUL_PROPAGATE_FAULT; |
| |
| if (emulator_write_phys(vcpu, gpa, val, bytes)) |
| return X86EMUL_CONTINUE; |
| |
| vcpu->mmio_needed = 1; |
| vcpu->mmio_phys_addr = gpa; |
| vcpu->mmio_size = bytes; |
| vcpu->mmio_is_write = 1; |
| memcpy(vcpu->mmio_data, &val, bytes); |
| |
| return X86EMUL_CONTINUE; |
| } |
| |
| static int emulator_cmpxchg_emulated(unsigned long addr, |
| unsigned long old, |
| unsigned long new, |
| unsigned int bytes, |
| struct x86_emulate_ctxt *ctxt) |
| { |
| static int reported; |
| |
| if (!reported) { |
| reported = 1; |
| printk(KERN_WARNING "kvm: emulating exchange as write\n"); |
| } |
| return emulator_write_emulated(addr, new, bytes, ctxt); |
| } |
| |
| static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) |
| { |
| return kvm_arch_ops->get_segment_base(vcpu, seg); |
| } |
| |
| int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address) |
| { |
| return X86EMUL_CONTINUE; |
| } |
| |
| int emulate_clts(struct kvm_vcpu *vcpu) |
| { |
| unsigned long cr0; |
| |
| kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
| cr0 = vcpu->cr0 & ~CR0_TS_MASK; |
| kvm_arch_ops->set_cr0(vcpu, cr0); |
| return X86EMUL_CONTINUE; |
| } |
| |
| int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest) |
| { |
| struct kvm_vcpu *vcpu = ctxt->vcpu; |
| |
| switch (dr) { |
| case 0 ... 3: |
| *dest = kvm_arch_ops->get_dr(vcpu, dr); |
| return X86EMUL_CONTINUE; |
| default: |
| printk(KERN_DEBUG "%s: unexpected dr %u\n", |
| __FUNCTION__, dr); |
| return X86EMUL_UNHANDLEABLE; |
| } |
| } |
| |
| int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value) |
| { |
| unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U; |
| int exception; |
| |
| kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception); |
| if (exception) { |
| /* FIXME: better handling */ |
| return X86EMUL_UNHANDLEABLE; |
| } |
| return X86EMUL_CONTINUE; |
| } |
| |
| static void report_emulation_failure(struct x86_emulate_ctxt *ctxt) |
| { |
| static int reported; |
| u8 opcodes[4]; |
| unsigned long rip = ctxt->vcpu->rip; |
| unsigned long rip_linear; |
| |
| rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS); |
| |
| if (reported) |
| return; |
| |
| emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt); |
| |
| printk(KERN_ERR "emulation failed but !mmio_needed?" |
| " rip %lx %02x %02x %02x %02x\n", |
| rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]); |
| reported = 1; |
| } |
| |
| struct x86_emulate_ops emulate_ops = { |
| .read_std = emulator_read_std, |
| .write_std = emulator_write_std, |
| .read_emulated = emulator_read_emulated, |
| .write_emulated = emulator_write_emulated, |
| .cmpxchg_emulated = emulator_cmpxchg_emulated, |
| }; |
| |
| int emulate_instruction(struct kvm_vcpu *vcpu, |
| struct kvm_run *run, |
| unsigned long cr2, |
| u16 error_code) |
| { |
| struct x86_emulate_ctxt emulate_ctxt; |
| int r; |
| int cs_db, cs_l; |
| |
| kvm_arch_ops->cache_regs(vcpu); |
| |
| kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); |
| |
| emulate_ctxt.vcpu = vcpu; |
| emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu); |
| emulate_ctxt.cr2 = cr2; |
| emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM) |
| ? X86EMUL_MODE_REAL : cs_l |
| ? X86EMUL_MODE_PROT64 : cs_db |
| ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; |
| |
| if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) { |
| emulate_ctxt.cs_base = 0; |
| emulate_ctxt.ds_base = 0; |
| emulate_ctxt.es_base = 0; |
| emulate_ctxt.ss_base = 0; |
| } else { |
| emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS); |
| emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS); |
| emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES); |
| emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS); |
| } |
| |
| emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS); |
| emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS); |
| |
| vcpu->mmio_is_write = 0; |
| r = x86_emulate_memop(&emulate_ctxt, &emulate_ops); |
| |
| if ((r || vcpu->mmio_is_write) && run) { |
| run->mmio.phys_addr = vcpu->mmio_phys_addr; |
| memcpy(run->mmio.data, vcpu->mmio_data, 8); |
| run->mmio.len = vcpu->mmio_size; |
| run->mmio.is_write = vcpu->mmio_is_write; |
| } |
| |
| if (r) { |
| if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) |
| return EMULATE_DONE; |
| if (!vcpu->mmio_needed) { |
| report_emulation_failure(&emulate_ctxt); |
| return EMULATE_FAIL; |
| } |
| return EMULATE_DO_MMIO; |
| } |
| |
| kvm_arch_ops->decache_regs(vcpu); |
| kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags); |
| |
| if (vcpu->mmio_is_write) |
| return EMULATE_DO_MMIO; |
| |
| return EMULATE_DONE; |
| } |
| EXPORT_SYMBOL_GPL(emulate_instruction); |
| |
| static u64 mk_cr_64(u64 curr_cr, u32 new_val) |
| { |
| return (curr_cr & ~((1ULL << 32) - 1)) | new_val; |
| } |
| |
| void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) |
| { |
| struct descriptor_table dt = { limit, base }; |
| |
| kvm_arch_ops->set_gdt(vcpu, &dt); |
| } |
| |
| void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) |
| { |
| struct descriptor_table dt = { limit, base }; |
| |
| kvm_arch_ops->set_idt(vcpu, &dt); |
| } |
| |
| void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw, |
| unsigned long *rflags) |
| { |
| lmsw(vcpu, msw); |
| *rflags = kvm_arch_ops->get_rflags(vcpu); |
| } |
| |
| unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) |
| { |
| kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
| switch (cr) { |
| case 0: |
| return vcpu->cr0; |
| case 2: |
| return vcpu->cr2; |
| case 3: |
| return vcpu->cr3; |
| case 4: |
| return vcpu->cr4; |
| default: |
| vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); |
| return 0; |
| } |
| } |
| |
| void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, |
| unsigned long *rflags) |
| { |
| switch (cr) { |
| case 0: |
| set_cr0(vcpu, mk_cr_64(vcpu->cr0, val)); |
| *rflags = kvm_arch_ops->get_rflags(vcpu); |
| break; |
| case 2: |
| vcpu->cr2 = val; |
| break; |
| case 3: |
| set_cr3(vcpu, val); |
| break; |
| case 4: |
| set_cr4(vcpu, mk_cr_64(vcpu->cr4, val)); |
| break; |
| default: |
| vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); |
| } |
| } |
| |
| int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) |
| { |
| u64 data; |
| |
| switch (msr) { |
| case 0xc0010010: /* SYSCFG */ |
| case 0xc0010015: /* HWCR */ |
| case MSR_IA32_PLATFORM_ID: |
| case MSR_IA32_P5_MC_ADDR: |
| case MSR_IA32_P5_MC_TYPE: |
| case MSR_IA32_MC0_CTL: |
| case MSR_IA32_MCG_STATUS: |
| case MSR_IA32_MCG_CAP: |
| case MSR_IA32_MC0_MISC: |
| case MSR_IA32_MC0_MISC+4: |
| case MSR_IA32_MC0_MISC+8: |
| case MSR_IA32_MC0_MISC+12: |
| case MSR_IA32_MC0_MISC+16: |
| case MSR_IA32_UCODE_REV: |
| case MSR_IA32_PERF_STATUS: |
| /* MTRR registers */ |
| case 0xfe: |
| case 0x200 ... 0x2ff: |
| data = 0; |
| break; |
| case 0xcd: /* fsb frequency */ |
| data = 3; |
| break; |
| case MSR_IA32_APICBASE: |
| data = vcpu->apic_base; |
| break; |
| #ifdef CONFIG_X86_64 |
| case MSR_EFER: |
| data = vcpu->shadow_efer; |
| break; |
| #endif |
| default: |
| printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr); |
| return 1; |
| } |
| *pdata = data; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_get_msr_common); |
| |
| /* |
| * Reads an msr value (of 'msr_index') into 'pdata'. |
| * Returns 0 on success, non-0 otherwise. |
| * Assumes vcpu_load() was already called. |
| */ |
| static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) |
| { |
| return kvm_arch_ops->get_msr(vcpu, msr_index, pdata); |
| } |
| |
| #ifdef CONFIG_X86_64 |
| |
| static void set_efer(struct kvm_vcpu *vcpu, u64 efer) |
| { |
| if (efer & EFER_RESERVED_BITS) { |
| printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n", |
| efer); |
| inject_gp(vcpu); |
| return; |
| } |
| |
| if (is_paging(vcpu) |
| && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) { |
| printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n"); |
| inject_gp(vcpu); |
| return; |
| } |
| |
| kvm_arch_ops->set_efer(vcpu, efer); |
| |
| efer &= ~EFER_LMA; |
| efer |= vcpu->shadow_efer & EFER_LMA; |
| |
| vcpu->shadow_efer = efer; |
| } |
| |
| #endif |
| |
| int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) |
| { |
| switch (msr) { |
| #ifdef CONFIG_X86_64 |
| case MSR_EFER: |
| set_efer(vcpu, data); |
| break; |
| #endif |
| case MSR_IA32_MC0_STATUS: |
| printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n", |
| __FUNCTION__, data); |
| break; |
| case MSR_IA32_UCODE_REV: |
| case MSR_IA32_UCODE_WRITE: |
| case 0x200 ... 0x2ff: /* MTRRs */ |
| break; |
| case MSR_IA32_APICBASE: |
| vcpu->apic_base = data; |
| break; |
| default: |
| printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr); |
| return 1; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_msr_common); |
| |
| /* |
| * Writes msr value into into the appropriate "register". |
| * Returns 0 on success, non-0 otherwise. |
| * Assumes vcpu_load() was already called. |
| */ |
| static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) |
| { |
| return kvm_arch_ops->set_msr(vcpu, msr_index, data); |
| } |
| |
| void kvm_resched(struct kvm_vcpu *vcpu) |
| { |
| vcpu_put(vcpu); |
| cond_resched(); |
| /* Cannot fail - no vcpu unplug yet. */ |
| vcpu_load(vcpu->kvm, vcpu_slot(vcpu)); |
| } |
| EXPORT_SYMBOL_GPL(kvm_resched); |
| |
| void load_msrs(struct vmx_msr_entry *e, int n) |
| { |
| int i; |
| |
| for (i = 0; i < n; ++i) |
| wrmsrl(e[i].index, e[i].data); |
| } |
| EXPORT_SYMBOL_GPL(load_msrs); |
| |
| void save_msrs(struct vmx_msr_entry *e, int n) |
| { |
| int i; |
| |
| for (i = 0; i < n; ++i) |
| rdmsrl(e[i].index, e[i].data); |
| } |
| EXPORT_SYMBOL_GPL(save_msrs); |
| |
| static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run) |
| { |
| struct kvm_vcpu *vcpu; |
| int r; |
| |
| if (!valid_vcpu(kvm_run->vcpu)) |
| return -EINVAL; |
| |
| vcpu = vcpu_load(kvm, kvm_run->vcpu); |
| if (!vcpu) |
| return -ENOENT; |
| |
| if (kvm_run->emulated) { |
| kvm_arch_ops->skip_emulated_instruction(vcpu); |
| kvm_run->emulated = 0; |
| } |
| |
| if (kvm_run->mmio_completed) { |
| memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8); |
| vcpu->mmio_read_completed = 1; |
| } |
| |
| vcpu->mmio_needed = 0; |
| |
| r = kvm_arch_ops->run(vcpu, kvm_run); |
| |
| vcpu_put(vcpu); |
| return r; |
| } |
| |
| static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs) |
| { |
| struct kvm_vcpu *vcpu; |
| |
| if (!valid_vcpu(regs->vcpu)) |
| return -EINVAL; |
| |
| vcpu = vcpu_load(kvm, regs->vcpu); |
| if (!vcpu) |
| return -ENOENT; |
| |
| kvm_arch_ops->cache_regs(vcpu); |
| |
| regs->rax = vcpu->regs[VCPU_REGS_RAX]; |
| regs->rbx = vcpu->regs[VCPU_REGS_RBX]; |
| regs->rcx = vcpu->regs[VCPU_REGS_RCX]; |
| regs->rdx = vcpu->regs[VCPU_REGS_RDX]; |
| regs->rsi = vcpu->regs[VCPU_REGS_RSI]; |
| regs->rdi = vcpu->regs[VCPU_REGS_RDI]; |
| regs->rsp = vcpu->regs[VCPU_REGS_RSP]; |
| regs->rbp = vcpu->regs[VCPU_REGS_RBP]; |
| #ifdef CONFIG_X86_64 |
| regs->r8 = vcpu->regs[VCPU_REGS_R8]; |
| regs->r9 = vcpu->regs[VCPU_REGS_R9]; |
| regs->r10 = vcpu->regs[VCPU_REGS_R10]; |
| regs->r11 = vcpu->regs[VCPU_REGS_R11]; |
| regs->r12 = vcpu->regs[VCPU_REGS_R12]; |
| regs->r13 = vcpu->regs[VCPU_REGS_R13]; |
| regs->r14 = vcpu->regs[VCPU_REGS_R14]; |
| regs->r15 = vcpu->regs[VCPU_REGS_R15]; |
| #endif |
| |
| regs->rip = vcpu->rip; |
| regs->rflags = kvm_arch_ops->get_rflags(vcpu); |
| |
| /* |
| * Don't leak debug flags in case they were set for guest debugging |
| */ |
| if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep) |
| regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF); |
| |
| vcpu_put(vcpu); |
| |
| return 0; |
| } |
| |
| static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs) |
| { |
| struct kvm_vcpu *vcpu; |
| |
| if (!valid_vcpu(regs->vcpu)) |
| return -EINVAL; |
| |
| vcpu = vcpu_load(kvm, regs->vcpu); |
| if (!vcpu) |
| return -ENOENT; |
| |
| vcpu->regs[VCPU_REGS_RAX] = regs->rax; |
| vcpu->regs[VCPU_REGS_RBX] = regs->rbx; |
| vcpu->regs[VCPU_REGS_RCX] = regs->rcx; |
| vcpu->regs[VCPU_REGS_RDX] = regs->rdx; |
| vcpu->regs[VCPU_REGS_RSI] = regs->rsi; |
| vcpu->regs[VCPU_REGS_RDI] = regs->rdi; |
| vcpu->regs[VCPU_REGS_RSP] = regs->rsp; |
| vcpu->regs[VCPU_REGS_RBP] = regs->rbp; |
| #ifdef CONFIG_X86_64 |
| vcpu->regs[VCPU_REGS_R8] = regs->r8; |
| vcpu->regs[VCPU_REGS_R9] = regs->r9; |
| vcpu->regs[VCPU_REGS_R10] = regs->r10; |
| vcpu->regs[VCPU_REGS_R11] = regs->r11; |
| vcpu->regs[VCPU_REGS_R12] = regs->r12; |
| vcpu->regs[VCPU_REGS_R13] = regs->r13; |
| vcpu->regs[VCPU_REGS_R14] = regs->r14; |
| vcpu->regs[VCPU_REGS_R15] = regs->r15; |
| #endif |
| |
| vcpu->rip = regs->rip; |
| kvm_arch_ops->set_rflags(vcpu, regs->rflags); |
| |
| kvm_arch_ops->decache_regs(vcpu); |
| |
| vcpu_put(vcpu); |
| |
| return 0; |
| } |
| |
| static void get_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg) |
| { |
| return kvm_arch_ops->get_segment(vcpu, var, seg); |
| } |
| |
| static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs) |
| { |
| struct kvm_vcpu *vcpu; |
| struct descriptor_table dt; |
| |
| if (!valid_vcpu(sregs->vcpu)) |
| return -EINVAL; |
| vcpu = vcpu_load(kvm, sregs->vcpu); |
| if (!vcpu) |
| return -ENOENT; |
| |
| get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); |
| get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); |
| get_segment(vcpu, &sregs->es, VCPU_SREG_ES); |
| get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); |
| get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); |
| get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); |
| |
| get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); |
| get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); |
| |
| kvm_arch_ops->get_idt(vcpu, &dt); |
| sregs->idt.limit = dt.limit; |
| sregs->idt.base = dt.base; |
| kvm_arch_ops->get_gdt(vcpu, &dt); |
| sregs->gdt.limit = dt.limit; |
| sregs->gdt.base = dt.base; |
| |
| kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
| sregs->cr0 = vcpu->cr0; |
| sregs->cr2 = vcpu->cr2; |
| sregs->cr3 = vcpu->cr3; |
| sregs->cr4 = vcpu->cr4; |
| sregs->cr8 = vcpu->cr8; |
| sregs->efer = vcpu->shadow_efer; |
| sregs->apic_base = vcpu->apic_base; |
| |
| memcpy(sregs->interrupt_bitmap, vcpu->irq_pending, |
| sizeof sregs->interrupt_bitmap); |
| |
| vcpu_put(vcpu); |
| |
| return 0; |
| } |
| |
| static void set_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg) |
| { |
| return kvm_arch_ops->set_segment(vcpu, var, seg); |
| } |
| |
| static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs) |
| { |
| struct kvm_vcpu *vcpu; |
| int mmu_reset_needed = 0; |
| int i; |
| struct descriptor_table dt; |
| |
| if (!valid_vcpu(sregs->vcpu)) |
| return -EINVAL; |
| vcpu = vcpu_load(kvm, sregs->vcpu); |
| if (!vcpu) |
| return -ENOENT; |
| |
| set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); |
| set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); |
| set_segment(vcpu, &sregs->es, VCPU_SREG_ES); |
| set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); |
| set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); |
| set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); |
| |
| set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); |
| set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); |
| |
| dt.limit = sregs->idt.limit; |
| dt.base = sregs->idt.base; |
| kvm_arch_ops->set_idt(vcpu, &dt); |
| dt.limit = sregs->gdt.limit; |
| dt.base = sregs->gdt.base; |
| kvm_arch_ops->set_gdt(vcpu, &dt); |
| |
| vcpu->cr2 = sregs->cr2; |
| mmu_reset_needed |= vcpu->cr3 != sregs->cr3; |
| vcpu->cr3 = sregs->cr3; |
| |
| vcpu->cr8 = sregs->cr8; |
| |
| mmu_reset_needed |= vcpu->shadow_efer != sregs->efer; |
| #ifdef CONFIG_X86_64 |
| kvm_arch_ops->set_efer(vcpu, sregs->efer); |
| #endif |
| vcpu->apic_base = sregs->apic_base; |
| |
| kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu); |
| |
| mmu_reset_needed |= vcpu->cr0 != sregs->cr0; |
| kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0); |
| |
| mmu_reset_needed |= vcpu->cr4 != sregs->cr4; |
| kvm_arch_ops->set_cr4(vcpu, sregs->cr4); |
| if (!is_long_mode(vcpu) && is_pae(vcpu)) |
| load_pdptrs(vcpu, vcpu->cr3); |
| |
| if (mmu_reset_needed) |
| kvm_mmu_reset_context(vcpu); |
| |
| memcpy(vcpu->irq_pending, sregs->interrupt_bitmap, |
| sizeof vcpu->irq_pending); |
| vcpu->irq_summary = 0; |
| for (i = 0; i < NR_IRQ_WORDS; ++i) |
| if (vcpu->irq_pending[i]) |
| __set_bit(i, &vcpu->irq_summary); |
| |
| vcpu_put(vcpu); |
| |
| return 0; |
| } |
| |
| /* |
| * List of msr numbers which we expose to userspace through KVM_GET_MSRS |
| * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. |
| * |
| * This list is modified at module load time to reflect the |
| * capabilities of the host cpu. |
| */ |
| static u32 msrs_to_save[] = { |
| MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, |
| MSR_K6_STAR, |
| #ifdef CONFIG_X86_64 |
| MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, |
| #endif |
| MSR_IA32_TIME_STAMP_COUNTER, |
| }; |
| |
| static unsigned num_msrs_to_save; |
| |
| static __init void kvm_init_msr_list(void) |
| { |
| u32 dummy[2]; |
| unsigned i, j; |
| |
| for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) { |
| if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) |
| continue; |
| if (j < i) |
| msrs_to_save[j] = msrs_to_save[i]; |
| j++; |
| } |
| num_msrs_to_save = j; |
| } |
| |
| /* |
| * Adapt set_msr() to msr_io()'s calling convention |
| */ |
| static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) |
| { |
| return set_msr(vcpu, index, *data); |
| } |
| |
| /* |
| * Read or write a bunch of msrs. All parameters are kernel addresses. |
| * |
| * @return number of msrs set successfully. |
| */ |
| static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs, |
| struct kvm_msr_entry *entries, |
| int (*do_msr)(struct kvm_vcpu *vcpu, |
| unsigned index, u64 *data)) |
| { |
| struct kvm_vcpu *vcpu; |
| int i; |
| |
| if (!valid_vcpu(msrs->vcpu)) |
| return -EINVAL; |
| |
| vcpu = vcpu_load(kvm, msrs->vcpu); |
| if (!vcpu) |
| return -ENOENT; |
| |
| for (i = 0; i < msrs->nmsrs; ++i) |
| if (do_msr(vcpu, entries[i].index, &entries[i].data)) |
| break; |
| |
| vcpu_put(vcpu); |
| |
| return i; |
| } |
| |
| /* |
| * Read or write a bunch of msrs. Parameters are user addresses. |
| * |
| * @return number of msrs set successfully. |
| */ |
| static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs, |
| int (*do_msr)(struct kvm_vcpu *vcpu, |
| unsigned index, u64 *data), |
| int writeback) |
| { |
| struct kvm_msrs msrs; |
| struct kvm_msr_entry *entries; |
| int r, n; |
| unsigned size; |
| |
| r = -EFAULT; |
| if (copy_from_user(&msrs, user_msrs, sizeof msrs)) |
| goto out; |
| |
| r = -E2BIG; |
| if (msrs.nmsrs >= MAX_IO_MSRS) |
| goto out; |
| |
| r = -ENOMEM; |
| size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; |
| entries = vmalloc(size); |
| if (!entries) |
| goto out; |
| |
| r = -EFAULT; |
| if (copy_from_user(entries, user_msrs->entries, size)) |
| goto out_free; |
| |
| r = n = __msr_io(kvm, &msrs, entries, do_msr); |
| if (r < 0) |
| goto out_free; |
| |
| r = -EFAULT; |
| if (writeback && copy_to_user(user_msrs->entries, entries, size)) |
| goto out_free; |
| |
| r = n; |
| |
| out_free: |
| vfree(entries); |
| out: |
| return r; |
| } |
| |
| /* |
| * Translate a guest virtual address to a guest physical address. |
| */ |
| static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr) |
| { |
| unsigned long vaddr = tr->linear_address; |
| struct kvm_vcpu *vcpu; |
| gpa_t gpa; |
| |
| vcpu = vcpu_load(kvm, tr->vcpu); |
| if (!vcpu) |
| return -ENOENT; |
| spin_lock(&kvm->lock); |
| gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr); |
| tr->physical_address = gpa; |
| tr->valid = gpa != UNMAPPED_GVA; |
| tr->writeable = 1; |
| tr->usermode = 0; |
| spin_unlock(&kvm->lock); |
| vcpu_put(vcpu); |
| |
| return 0; |
| } |
| |
| static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq) |
| { |
| struct kvm_vcpu *vcpu; |
| |
| if (!valid_vcpu(irq->vcpu)) |
| return -EINVAL; |
| if (irq->irq < 0 || irq->irq >= 256) |
| return -EINVAL; |
| vcpu = vcpu_load(kvm, irq->vcpu); |
| if (!vcpu) |
| return -ENOENT; |
| |
| set_bit(irq->irq, vcpu->irq_pending); |
| set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary); |
| |
| vcpu_put(vcpu); |
| |
| return 0; |
| } |
| |
| static int kvm_dev_ioctl_debug_guest(struct kvm *kvm, |
| struct kvm_debug_guest *dbg) |
| { |
| struct kvm_vcpu *vcpu; |
| int r; |
| |
| if (!valid_vcpu(dbg->vcpu)) |
| return -EINVAL; |
| vcpu = vcpu_load(kvm, dbg->vcpu); |
| if (!vcpu) |
| return -ENOENT; |
| |
| r = kvm_arch_ops->set_guest_debug(vcpu, dbg); |
| |
| vcpu_put(vcpu); |
| |
| return r; |
| } |
| |
| static long kvm_dev_ioctl(struct file *filp, |
| unsigned int ioctl, unsigned long arg) |
| { |
| struct kvm *kvm = filp->private_data; |
| int r = -EINVAL; |
| |
| switch (ioctl) { |
| case KVM_GET_API_VERSION: |
| r = KVM_API_VERSION; |
| break; |
| case KVM_CREATE_VCPU: { |
| r = kvm_dev_ioctl_create_vcpu(kvm, arg); |
| if (r) |
| goto out; |
| break; |
| } |
| case KVM_RUN: { |
| struct kvm_run kvm_run; |
| |
| r = -EFAULT; |
| if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run)) |
| goto out; |
| r = kvm_dev_ioctl_run(kvm, &kvm_run); |
| if (r < 0 && r != -EINTR) |
| goto out; |
| if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run)) { |
| r = -EFAULT; |
| goto out; |
| } |
| break; |
| } |
| case KVM_GET_REGS: { |
| struct kvm_regs kvm_regs; |
| |
| r = -EFAULT; |
| if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs)) |
| goto out; |
| r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs); |
| if (r) |
| goto out; |
| r = -EFAULT; |
| if (copy_to_user((void *)arg, &kvm_regs, sizeof kvm_regs)) |
| goto out; |
| r = 0; |
| break; |
| } |
| case KVM_SET_REGS: { |
| struct kvm_regs kvm_regs; |
| |
| r = -EFAULT; |
| if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs)) |
| goto out; |
| r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs); |
| if (r) |
| goto out; |
| r = 0; |
| break; |
| } |
| case KVM_GET_SREGS: { |
| struct kvm_sregs kvm_sregs; |
| |
| r = -EFAULT; |
| if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs)) |
| goto out; |
| r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs); |
| if (r) |
| goto out; |
| r = -EFAULT; |
| if (copy_to_user((void *)arg, &kvm_sregs, sizeof kvm_sregs)) |
| goto out; |
| r = 0; |
| break; |
| } |
| case KVM_SET_SREGS: { |
| struct kvm_sregs kvm_sregs; |
| |
| r = -EFAULT; |
| if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs)) |
| goto out; |
| r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs); |
| if (r) |
| goto out; |
| r = 0; |
| break; |
| } |
| case KVM_TRANSLATE: { |
| struct kvm_translation tr; |
| |
| r = -EFAULT; |
| if (copy_from_user(&tr, (void *)arg, sizeof tr)) |
| goto out; |
| r = kvm_dev_ioctl_translate(kvm, &tr); |
| if (r) |
| goto out; |
| r = -EFAULT; |
| if (copy_to_user((void *)arg, &tr, sizeof tr)) |
| goto out; |
| r = 0; |
| break; |
| } |
| case KVM_INTERRUPT: { |
| struct kvm_interrupt irq; |
| |
| r = -EFAULT; |
| if (copy_from_user(&irq, (void *)arg, sizeof irq)) |
| goto out; |
| r = kvm_dev_ioctl_interrupt(kvm, &irq); |
| if (r) |
| goto out; |
| r = 0; |
| break; |
| } |
| case KVM_DEBUG_GUEST: { |
| struct kvm_debug_guest dbg; |
| |
| r = -EFAULT; |
| if (copy_from_user(&dbg, (void *)arg, sizeof dbg)) |
| goto out; |
| r = kvm_dev_ioctl_debug_guest(kvm, &dbg); |
| if (r) |
| goto out; |
| r = 0; |
| break; |
| } |
| case KVM_SET_MEMORY_REGION: { |
| struct kvm_memory_region kvm_mem; |
| |
| r = -EFAULT; |
| if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem)) |
| goto out; |
| r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem); |
| if (r) |
| goto out; |
| break; |
| } |
| case KVM_GET_DIRTY_LOG: { |
| struct kvm_dirty_log log; |
| |
| r = -EFAULT; |
| if (copy_from_user(&log, (void *)arg, sizeof log)) |
| goto out; |
| r = kvm_dev_ioctl_get_dirty_log(kvm, &log); |
| if (r) |
| goto out; |
| break; |
| } |
| case KVM_GET_MSRS: |
| r = msr_io(kvm, (void __user *)arg, get_msr, 1); |
| break; |
| case KVM_SET_MSRS: |
| r = msr_io(kvm, (void __user *)arg, do_set_msr, 0); |
| break; |
| case KVM_GET_MSR_INDEX_LIST: { |
| struct kvm_msr_list __user *user_msr_list = (void __user *)arg; |
| struct kvm_msr_list msr_list; |
| unsigned n; |
| |
| r = -EFAULT; |
| if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) |
| goto out; |
| n = msr_list.nmsrs; |
| msr_list.nmsrs = num_msrs_to_save; |
| if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) |
| goto out; |
| r = -E2BIG; |
| if (n < num_msrs_to_save) |
| goto out; |
| r = -EFAULT; |
| if (copy_to_user(user_msr_list->indices, &msrs_to_save, |
| num_msrs_to_save * sizeof(u32))) |
| goto out; |
| r = 0; |
| } |
| default: |
| ; |
| } |
| out: |
| return r; |
| } |
| |
| static struct page *kvm_dev_nopage(struct vm_area_struct *vma, |
| unsigned long address, |
| int *type) |
| { |
| struct kvm *kvm = vma->vm_file->private_data; |
| unsigned long pgoff; |
| struct kvm_memory_slot *slot; |
| struct page *page; |
| |
| *type = VM_FAULT_MINOR; |
| pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; |
| slot = gfn_to_memslot(kvm, pgoff); |
| if (!slot) |
| return NOPAGE_SIGBUS; |
| page = gfn_to_page(slot, pgoff); |
| if (!page) |
| return NOPAGE_SIGBUS; |
| get_page(page); |
| return page; |
| } |
| |
| static struct vm_operations_struct kvm_dev_vm_ops = { |
| .nopage = kvm_dev_nopage, |
| }; |
| |
| static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| vma->vm_ops = &kvm_dev_vm_ops; |
| return 0; |
| } |
| |
| static struct file_operations kvm_chardev_ops = { |
| .open = kvm_dev_open, |
| .release = kvm_dev_release, |
| .unlocked_ioctl = kvm_dev_ioctl, |
| .compat_ioctl = kvm_dev_ioctl, |
| .mmap = kvm_dev_mmap, |
| }; |
| |
| static struct miscdevice kvm_dev = { |
| MISC_DYNAMIC_MINOR, |
| "kvm", |
| &kvm_chardev_ops, |
| }; |
| |
| static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
| void *v) |
| { |
| if (val == SYS_RESTART) { |
| /* |
| * Some (well, at least mine) BIOSes hang on reboot if |
| * in vmx root mode. |
| */ |
| printk(KERN_INFO "kvm: exiting hardware virtualization\n"); |
| on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1); |
| } |
| return NOTIFY_OK; |
| } |
| |
| static struct notifier_block kvm_reboot_notifier = { |
| .notifier_call = kvm_reboot, |
| .priority = 0, |
| }; |
| |
| static __init void kvm_init_debug(void) |
| { |
| struct kvm_stats_debugfs_item *p; |
| |
| debugfs_dir = debugfs_create_dir("kvm", 0); |
| for (p = debugfs_entries; p->name; ++p) |
| p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir, |
| p->data); |
| } |
| |
| static void kvm_exit_debug(void) |
| { |
| struct kvm_stats_debugfs_item *p; |
| |
| for (p = debugfs_entries; p->name; ++p) |
| debugfs_remove(p->dentry); |
| debugfs_remove(debugfs_dir); |
| } |
| |
| hpa_t bad_page_address; |
| |
| int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module) |
| { |
| int r; |
| |
| if (kvm_arch_ops) { |
| printk(KERN_ERR "kvm: already loaded the other module\n"); |
| return -EEXIST; |
| } |
| |
| if (!ops->cpu_has_kvm_support()) { |
| printk(KERN_ERR "kvm: no hardware support\n"); |
| return -EOPNOTSUPP; |
| } |
| if (ops->disabled_by_bios()) { |
| printk(KERN_ERR "kvm: disabled by bios\n"); |
| return -EOPNOTSUPP; |
| } |
| |
| kvm_arch_ops = ops; |
| |
| r = kvm_arch_ops->hardware_setup(); |
| if (r < 0) |
| return r; |
| |
| on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1); |
| register_reboot_notifier(&kvm_reboot_notifier); |
| |
| kvm_chardev_ops.owner = module; |
| |
| r = misc_register(&kvm_dev); |
| if (r) { |
| printk (KERN_ERR "kvm: misc device register failed\n"); |
| goto out_free; |
| } |
| |
| return r; |
| |
| out_free: |
| unregister_reboot_notifier(&kvm_reboot_notifier); |
| on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1); |
| kvm_arch_ops->hardware_unsetup(); |
| return r; |
| } |
| |
| void kvm_exit_arch(void) |
| { |
| misc_deregister(&kvm_dev); |
| |
| unregister_reboot_notifier(&kvm_reboot_notifier); |
| on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1); |
| kvm_arch_ops->hardware_unsetup(); |
| kvm_arch_ops = NULL; |
| } |
| |
| static __init int kvm_init(void) |
| { |
| static struct page *bad_page; |
| int r = 0; |
| |
| kvm_init_debug(); |
| |
| kvm_init_msr_list(); |
| |
| if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) { |
| r = -ENOMEM; |
| goto out; |
| } |
| |
| bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT; |
| memset(__va(bad_page_address), 0, PAGE_SIZE); |
| |
| return r; |
| |
| out: |
| kvm_exit_debug(); |
| return r; |
| } |
| |
| static __exit void kvm_exit(void) |
| { |
| kvm_exit_debug(); |
| __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT)); |
| } |
| |
| module_init(kvm_init) |
| module_exit(kvm_exit) |
| |
| EXPORT_SYMBOL_GPL(kvm_init_arch); |
| EXPORT_SYMBOL_GPL(kvm_exit_arch); |