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e7df56e4a0
linux-next/drivers/kvm/kvm_main.c
Avi Kivity e7df56e4a0 KVM: Remove extraneous guest entry on mmio read 
When emulating an mmio read, we actually emulate twice: once to determine
the physical address of the mmio, and, after we've exited to userspace to
get the mmio value, we emulate again to place the value in the result
register and update any flags.

But we don't really need to enter the guest again for that, only to take
an immediate vmexit.  So, if we detect that we're doing an mmio read,
emulate a single instruction before entering the guest again.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-05-03 10:52:32 +03:00

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/*
* 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 <linux/magic.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 <linux/sysdev.h>
#include <linux/cpu.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include "x86_emulate.h"
#include "segment_descriptor.h"
MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");
static DEFINE_SPINLOCK(kvm_lock);
static LIST_HEAD(vm_list);
struct kvm_arch_ops *kvm_arch_ops;
#define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
static struct kvm_stats_debugfs_item {
const char *name;
int offset;
struct dentry *dentry;
} debugfs_entries[] = {
{ "pf_fixed", STAT_OFFSET(pf_fixed) },
{ "pf_guest", STAT_OFFSET(pf_guest) },
{ "tlb_flush", STAT_OFFSET(tlb_flush) },
{ "invlpg", STAT_OFFSET(invlpg) },
{ "exits", STAT_OFFSET(exits) },
{ "io_exits", STAT_OFFSET(io_exits) },
{ "mmio_exits", STAT_OFFSET(mmio_exits) },
{ "signal_exits", STAT_OFFSET(signal_exits) },
{ "irq_window", STAT_OFFSET(irq_window_exits) },
{ "halt_exits", STAT_OFFSET(halt_exits) },
{ "request_irq", STAT_OFFSET(request_irq_exits) },
{ "irq_exits", STAT_OFFSET(irq_exits) },
{ NULL }
};
static struct dentry *debugfs_dir;
struct vfsmount *kvmfs_mnt;
#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
static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
unsigned long arg);
static struct inode *kvmfs_inode(struct file_operations *fops)
{
int error = -ENOMEM;
struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
if (!inode)
goto eexit_1;
inode->i_fop = fops;
/*
* Mark the inode dirty from the very beginning,
* that way it will never be moved to the dirty
* list because mark_inode_dirty() will think
* that it already _is_ on the dirty list.
*/
inode->i_state = I_DIRTY;
inode->i_mode = S_IRUSR | S_IWUSR;
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
return inode;
eexit_1:
return ERR_PTR(error);
}
static struct file *kvmfs_file(struct inode *inode, void *private_data)
{
struct file *file = get_empty_filp();
if (!file)
return ERR_PTR(-ENFILE);
file->f_path.mnt = mntget(kvmfs_mnt);
file->f_path.dentry = d_alloc_anon(inode);
if (!file->f_path.dentry)
return ERR_PTR(-ENOMEM);
file->f_mapping = inode->i_mapping;
file->f_pos = 0;
file->f_flags = O_RDWR;
file->f_op = inode->i_fop;
file->f_mode = FMODE_READ | FMODE_WRITE;
file->f_version = 0;
file->private_data = private_data;
return file;
}
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;
gfn_t gfn;
paddr = gva_to_hpa(vcpu, addr);
if (is_error_hpa(paddr))
break;
gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
mark_page_dirty(vcpu->kvm, gfn);
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);
/*
* Switches to specified vcpu, until a matching vcpu_put()
*/
static void vcpu_load(struct kvm_vcpu *vcpu)
{
mutex_lock(&vcpu->mutex);
kvm_arch_ops->vcpu_load(vcpu);
}
/*
* Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
* if the slot is not populated.
*/
static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
{
struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
mutex_lock(&vcpu->mutex);
if (!vcpu->vmcs) {
mutex_unlock(&vcpu->mutex);
return NULL;
}
kvm_arch_ops->vcpu_load(vcpu);
return vcpu;
}
static void vcpu_put(struct kvm_vcpu *vcpu)
{
kvm_arch_ops->vcpu_put(vcpu);
mutex_unlock(&vcpu->mutex);
}
static struct kvm *kvm_create_vm(void)
{
struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
int i;
if (!kvm)
return ERR_PTR(-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->cpu = -1;
vcpu->kvm = kvm;
vcpu->mmu.root_hpa = INVALID_PAGE;
INIT_LIST_HEAD(&vcpu->free_pages);
spin_lock(&kvm_lock);
list_add(&kvm->vm_list, &vm_list);
spin_unlock(&kvm_lock);
}
return kvm;
}
static int kvm_dev_open(struct inode *inode, struct file *filp)
{
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 = NULL;
free->npages = 0;
free->dirty_bitmap = NULL;
}
static void kvm_free_physmem(struct kvm *kvm)
{
int i;
for (i = 0; i < kvm->nmemslots; ++i)
kvm_free_physmem_slot(&kvm->memslots[i], NULL);
}
static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
{
int i;
for (i = 0; i < 2; ++i)
if (vcpu->pio.guest_pages[i]) {
__free_page(vcpu->pio.guest_pages[i]);
vcpu->pio.guest_pages[i] = NULL;
}
}
static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
{
if (!vcpu->vmcs)
return;
vcpu_load(vcpu);
kvm_mmu_destroy(vcpu);
vcpu_put(vcpu);
kvm_arch_ops->vcpu_free(vcpu);
free_page((unsigned long)vcpu->run);
vcpu->run = NULL;
free_page((unsigned long)vcpu->pio_data);
vcpu->pio_data = NULL;
free_pio_guest_pages(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)
{
return 0;
}
static void kvm_destroy_vm(struct kvm *kvm)
{
spin_lock(&kvm_lock);
list_del(&kvm->vm_list);
spin_unlock(&kvm_lock);
kvm_free_vcpus(kvm);
kvm_free_physmem(kvm);
kfree(kvm);
}
static int kvm_vm_release(struct inode *inode, struct file *filp)
{
struct kvm *kvm = filp->private_data;
kvm_destroy_vm(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 page *page;
spin_lock(&vcpu->kvm->lock);
page = gfn_to_page(vcpu->kvm, pdpt_gfn);
/* FIXME: !page - emulate? 0xff? */
pdpt = kmap_atomic(page, 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)
{
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);
/*
* Does the new cr3 value map to physical memory? (Note, we
* catch an invalid cr3 even in real-mode, because it would
* cause trouble later on when we turn on paging anyway.)
*
* A real CPU would silently accept an invalid cr3 and would
* attempt to use it - with largely undefined (and often hard
* to debug) behavior on the guest side.
*/
if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
inject_gp(vcpu);
else
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);
static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
{
spin_lock(&vcpu->kvm->lock);
kvm_mmu_slot_remove_write_access(vcpu, slot);
spin_unlock(&vcpu->kvm->lock);
}
/*
* Allocate some memory and give it an address in the guest physical address
* space.
*
* Discontiguous memory is allowed, mostly for framebuffers.
*/
static int kvm_vm_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 = NULL;
/* Free page dirty bitmap if unneeded */
if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
new.dirty_bitmap = NULL;
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;
set_page_private(new.phys_mem[i],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_slot(kvm, i);
if (!vcpu)
continue;
if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
do_remove_write_access(vcpu, mem->slot);
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_vm_ioctl_get_dirty_log(struct kvm *kvm,
struct kvm_dirty_log *log)
{
struct kvm_memory_slot *memslot;
int r, i;
int n;
int cleared;
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, BITS_PER_LONG) / 8;
for (i = 0; !any && i < n/sizeof(long); ++i)
any = memslot->dirty_bitmap[i];
r = -EFAULT;
if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
goto out;
if (any) {
cleared = 0;
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
struct kvm_vcpu *vcpu;
vcpu = vcpu_load_slot(kvm, i);
if (!vcpu)
continue;
if (!cleared) {
do_remove_write_access(vcpu, log->slot);
memset(memslot->dirty_bitmap, 0, n);
cleared = 1;
}
kvm_arch_ops->tlb_flush(vcpu);
vcpu_put(vcpu);
}
}
r = 0;
out:
spin_lock(&kvm->lock);
--kvm->busy;
spin_unlock(&kvm->lock);
return r;
}
/*
* Set a new alias region. Aliases map a portion of physical memory into
* another portion. This is useful for memory windows, for example the PC
* VGA region.
*/
static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
struct kvm_memory_alias *alias)
{
int r, n;
struct kvm_mem_alias *p;
r = -EINVAL;
/* General sanity checks */
if (alias->memory_size & (PAGE_SIZE - 1))
goto out;
if (alias->guest_phys_addr & (PAGE_SIZE - 1))
goto out;
if (alias->slot >= KVM_ALIAS_SLOTS)
goto out;
if (alias->guest_phys_addr + alias->memory_size
< alias->guest_phys_addr)
goto out;
if (alias->target_phys_addr + alias->memory_size
< alias->target_phys_addr)
goto out;
spin_lock(&kvm->lock);
p = &kvm->aliases[alias->slot];
p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
p->npages = alias->memory_size >> PAGE_SHIFT;
p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
for (n = KVM_ALIAS_SLOTS; n > 0; --n)
if (kvm->aliases[n - 1].npages)
break;
kvm->naliases = n;
spin_unlock(&kvm->lock);
vcpu_load(&kvm->vcpus[0]);
spin_lock(&kvm->lock);
kvm_mmu_zap_all(&kvm->vcpus[0]);
spin_unlock(&kvm->lock);
vcpu_put(&kvm->vcpus[0]);
return 0;
out:
return r;
}
static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{
int i;
struct kvm_mem_alias *alias;
for (i = 0; i < kvm->naliases; ++i) {
alias = &kvm->aliases[i];
if (gfn >= alias->base_gfn
&& gfn < alias->base_gfn + alias->npages)
return alias->target_gfn + gfn - alias->base_gfn;
}
return gfn;
}
static 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 NULL;
}
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
{
gfn = unalias_gfn(kvm, gfn);
return __gfn_to_memslot(kvm, gfn);
}
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
{
struct kvm_memory_slot *slot;
gfn = unalias_gfn(kvm, gfn);
slot = __gfn_to_memslot(kvm, gfn);
if (!slot)
return NULL;
return slot->phys_mem[gfn - slot->base_gfn];
}
EXPORT_SYMBOL_GPL(gfn_to_page);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
{
int i;
struct kvm_memory_slot *memslot = NULL;
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,
void *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 page *page;
void *page_virt;
if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
pfn = gpa >> PAGE_SHIFT;
page = gfn_to_page(vcpu->kvm, pfn);
if (!page)
return X86EMUL_UNHANDLEABLE;
page_virt = kmap_atomic(page, KM_USER0);
memcpy(data, page_virt + offset, tocopy);
kunmap_atomic(page_virt, KM_USER0);
bytes -= tocopy;
data += tocopy;
addr += tocopy;
}
return X86EMUL_CONTINUE;
}
static int emulator_write_std(unsigned long addr,
const void *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,
void *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 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,
const void *val, int bytes)
{
struct page *page;
void *virt;
if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
return 0;
page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
if (!page)
return 0;
kvm_mmu_pre_write(vcpu, gpa, bytes);
mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
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,
const void *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) {
kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
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,
const void *old,
const void *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;
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;
vcpu->mmio_fault_cr2 = cr2;
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);
int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
kvm_arch_ops->cache_regs(vcpu);
ret = -KVM_EINVAL;
#ifdef CONFIG_X86_64
if (is_long_mode(vcpu)) {
nr = vcpu->regs[VCPU_REGS_RAX];
a0 = vcpu->regs[VCPU_REGS_RDI];
a1 = vcpu->regs[VCPU_REGS_RSI];
a2 = vcpu->regs[VCPU_REGS_RDX];
a3 = vcpu->regs[VCPU_REGS_RCX];
a4 = vcpu->regs[VCPU_REGS_R8];
a5 = vcpu->regs[VCPU_REGS_R9];
} else
#endif
{
nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
}
switch (nr) {
default:
run->hypercall.args[0] = a0;
run->hypercall.args[1] = a1;
run->hypercall.args[2] = a2;
run->hypercall.args[3] = a3;
run->hypercall.args[4] = a4;
run->hypercall.args[5] = a5;
run->hypercall.ret = ret;
run->hypercall.longmode = is_long_mode(vcpu);
kvm_arch_ops->decache_regs(vcpu);
return 0;
}
vcpu->regs[VCPU_REGS_RAX] = ret;
kvm_arch_ops->decache_regs(vcpu);
return 1;
}
EXPORT_SYMBOL_GPL(kvm_hypercall);
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_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);
}
}
/*
* Register the para guest with the host:
*/
static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
{
struct kvm_vcpu_para_state *para_state;
hpa_t para_state_hpa, hypercall_hpa;
struct page *para_state_page;
unsigned char *hypercall;
gpa_t hypercall_gpa;
printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
/*
* Needs to be page aligned:
*/
if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
goto err_gp;
para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
if (is_error_hpa(para_state_hpa))
goto err_gp;
mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
para_state = kmap_atomic(para_state_page, KM_USER0);
printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
printk(KERN_DEBUG ".... size: %d\n", para_state->size);
para_state->host_version = KVM_PARA_API_VERSION;
/*
* We cannot support guests that try to register themselves
* with a newer API version than the host supports:
*/
if (para_state->guest_version > KVM_PARA_API_VERSION) {
para_state->ret = -KVM_EINVAL;
goto err_kunmap_skip;
}
hypercall_gpa = para_state->hypercall_gpa;
hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
if (is_error_hpa(hypercall_hpa)) {
para_state->ret = -KVM_EINVAL;
goto err_kunmap_skip;
}
printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
vcpu->para_state_page = para_state_page;
vcpu->para_state_gpa = para_state_gpa;
vcpu->hypercall_gpa = hypercall_gpa;
mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
kvm_arch_ops->patch_hypercall(vcpu, hypercall);
kunmap_atomic(hypercall, KM_USER1);
para_state->ret = 0;
err_kunmap_skip:
kunmap_atomic(para_state, KM_USER0);
return 0;
err_gp:
return 1;
}
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;
case MSR_IA32_MISC_ENABLE:
data = vcpu->ia32_misc_enable_msr;
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_MCG_STATUS:
printk(KERN_WARNING "%s: MSR_IA32_MCG_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;
case MSR_IA32_MISC_ENABLE:
vcpu->ia32_misc_enable_msr = data;
break;
/*
* This is the 'probe whether the host is KVM' logic:
*/
case MSR_KVM_API_MAGIC:
return vcpu_register_para(vcpu, data);
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)
{
if (!need_resched())
return;
vcpu_put(vcpu);
cond_resched();
vcpu_load(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);
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
{
int i;
u32 function;
struct kvm_cpuid_entry *e, *best;
kvm_arch_ops->cache_regs(vcpu);
function = vcpu->regs[VCPU_REGS_RAX];
vcpu->regs[VCPU_REGS_RAX] = 0;
vcpu->regs[VCPU_REGS_RBX] = 0;
vcpu->regs[VCPU_REGS_RCX] = 0;
vcpu->regs[VCPU_REGS_RDX] = 0;
best = NULL;
for (i = 0; i < vcpu->cpuid_nent; ++i) {
e = &vcpu->cpuid_entries[i];
if (e->function == function) {
best = e;
break;
}
/*
* Both basic or both extended?
*/
if (((e->function ^ function) & 0x80000000) == 0)
if (!best || e->function > best->function)
best = e;
}
if (best) {
vcpu->regs[VCPU_REGS_RAX] = best->eax;
vcpu->regs[VCPU_REGS_RBX] = best->ebx;
vcpu->regs[VCPU_REGS_RCX] = best->ecx;
vcpu->regs[VCPU_REGS_RDX] = best->edx;
}
kvm_arch_ops->decache_regs(vcpu);
kvm_arch_ops->skip_emulated_instruction(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
static int pio_copy_data(struct kvm_vcpu *vcpu)
{
void *p = vcpu->pio_data;
void *q;
unsigned bytes;
int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
kvm_arch_ops->vcpu_put(vcpu);
q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
PAGE_KERNEL);
if (!q) {
kvm_arch_ops->vcpu_load(vcpu);
free_pio_guest_pages(vcpu);
return -ENOMEM;
}
q += vcpu->pio.guest_page_offset;
bytes = vcpu->pio.size * vcpu->pio.cur_count;
if (vcpu->pio.in)
memcpy(q, p, bytes);
else
memcpy(p, q, bytes);
q -= vcpu->pio.guest_page_offset;
vunmap(q);
kvm_arch_ops->vcpu_load(vcpu);
free_pio_guest_pages(vcpu);
return 0;
}
static int complete_pio(struct kvm_vcpu *vcpu)
{
struct kvm_pio_request *io = &vcpu->pio;
long delta;
int r;
kvm_arch_ops->cache_regs(vcpu);
if (!io->string) {
if (io->in)
memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
io->size);
} else {
if (io->in) {
r = pio_copy_data(vcpu);
if (r) {
kvm_arch_ops->cache_regs(vcpu);
return r;
}
}
delta = 1;
if (io->rep) {
delta *= io->cur_count;
/*
* The size of the register should really depend on
* current address size.
*/
vcpu->regs[VCPU_REGS_RCX] -= delta;
}
if (io->down)
delta = -delta;
delta *= io->size;
if (io->in)
vcpu->regs[VCPU_REGS_RDI] += delta;
else
vcpu->regs[VCPU_REGS_RSI] += delta;
}
vcpu->run->io_completed = 0;
kvm_arch_ops->decache_regs(vcpu);
io->count -= io->cur_count;
io->cur_count = 0;
if (!io->count)
kvm_arch_ops->skip_emulated_instruction(vcpu);
return 0;
}
int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
int size, unsigned long count, int string, int down,
gva_t address, int rep, unsigned port)
{
unsigned now, in_page;
int i;
int nr_pages = 1;
struct page *page;
vcpu->run->exit_reason = KVM_EXIT_IO;
vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
vcpu->run->io.size = size;
vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
vcpu->run->io.count = count;
vcpu->run->io.port = port;
vcpu->pio.count = count;
vcpu->pio.cur_count = count;
vcpu->pio.size = size;
vcpu->pio.in = in;
vcpu->pio.string = string;
vcpu->pio.down = down;
vcpu->pio.guest_page_offset = offset_in_page(address);
vcpu->pio.rep = rep;
if (!string) {
kvm_arch_ops->cache_regs(vcpu);
memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
kvm_arch_ops->decache_regs(vcpu);
return 0;
}
if (!count) {
kvm_arch_ops->skip_emulated_instruction(vcpu);
return 1;
}
now = min(count, PAGE_SIZE / size);
if (!down)
in_page = PAGE_SIZE - offset_in_page(address);
else
in_page = offset_in_page(address) + size;
now = min(count, (unsigned long)in_page / size);
if (!now) {
/*
* String I/O straddles page boundary. Pin two guest pages
* so that we satisfy atomicity constraints. Do just one
* transaction to avoid complexity.
*/
nr_pages = 2;
now = 1;
}
if (down) {
/*
* String I/O in reverse. Yuck. Kill the guest, fix later.
*/
printk(KERN_ERR "kvm: guest string pio down\n");
inject_gp(vcpu);
return 1;
}
vcpu->run->io.count = now;
vcpu->pio.cur_count = now;
for (i = 0; i < nr_pages; ++i) {
spin_lock(&vcpu->kvm->lock);
page = gva_to_page(vcpu, address + i * PAGE_SIZE);
if (page)
get_page(page);
vcpu->pio.guest_pages[i] = page;
spin_unlock(&vcpu->kvm->lock);
if (!page) {
inject_gp(vcpu);
free_pio_guest_pages(vcpu);
return 1;
}
}
if (!vcpu->pio.in)
return pio_copy_data(vcpu);
return 0;
}
EXPORT_SYMBOL_GPL(kvm_setup_pio);
static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
int r;
sigset_t sigsaved;
vcpu_load(vcpu);
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
/* re-sync apic's tpr */
vcpu->cr8 = kvm_run->cr8;
if (kvm_run->io_completed) {
if (vcpu->pio.cur_count) {
r = complete_pio(vcpu);
if (r)
goto out;
} else if (!vcpu->mmio_is_write) {
memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
vcpu->mmio_read_completed = 1;
vcpu->mmio_needed = 0;
r = emulate_instruction(vcpu, kvm_run,
vcpu->mmio_fault_cr2, 0);
if (r == EMULATE_DO_MMIO) {
/*
* Read-modify-write. Back to userspace.
*/
kvm_run->exit_reason = KVM_EXIT_MMIO;
r = 0;
goto out;
}
}
}
if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
kvm_arch_ops->cache_regs(vcpu);
vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
kvm_arch_ops->decache_regs(vcpu);
}
r = kvm_arch_ops->run(vcpu, kvm_run);
out:
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
vcpu_put(vcpu);
return r;
}
static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
struct kvm_regs *regs)
{
vcpu_load(vcpu);
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_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
struct kvm_regs *regs)
{
vcpu_load(vcpu);
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_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
struct descriptor_table dt;
vcpu_load(vcpu);
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_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_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int mmu_reset_needed = 0;
int i;
struct descriptor_table dt;
vcpu_load(vcpu);
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_cr4_guest_bits(vcpu);
mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
kvm_arch_ops->set_cr0(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);
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);
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 u32 emulated_msrs[] = {
MSR_IA32_MISC_ENABLE,
};
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_vcpu *vcpu, struct kvm_msrs *msrs,
struct kvm_msr_entry *entries,
int (*do_msr)(struct kvm_vcpu *vcpu,
unsigned index, u64 *data))
{
int i;
vcpu_load(vcpu);
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_vcpu *vcpu, 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(vcpu, &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_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
struct kvm_translation *tr)
{
unsigned long vaddr = tr->linear_address;
gpa_t gpa;
vcpu_load(vcpu);
spin_lock(&vcpu->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(&vcpu->kvm->lock);
vcpu_put(vcpu);
return 0;
}
static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
struct kvm_interrupt *irq)
{
if (irq->irq < 0 || irq->irq >= 256)
return -EINVAL;
vcpu_load(vcpu);
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_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
struct kvm_debug_guest *dbg)
{
int r;
vcpu_load(vcpu);
r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
vcpu_put(vcpu);
return r;
}
static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
unsigned long address,
int *type)
{
struct kvm_vcpu *vcpu = vma->vm_file->private_data;
unsigned long pgoff;
struct page *page;
*type = VM_FAULT_MINOR;
pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
if (pgoff == 0)
page = virt_to_page(vcpu->run);
else if (pgoff == KVM_PIO_PAGE_OFFSET)
page = virt_to_page(vcpu->pio_data);
else
return NOPAGE_SIGBUS;
get_page(page);
return page;
}
static struct vm_operations_struct kvm_vcpu_vm_ops = {
.nopage = kvm_vcpu_nopage,
};
static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
{
vma->vm_ops = &kvm_vcpu_vm_ops;
return 0;
}
static int kvm_vcpu_release(struct inode *inode, struct file *filp)
{
struct kvm_vcpu *vcpu = filp->private_data;
fput(vcpu->kvm->filp);
return 0;
}
static struct file_operations kvm_vcpu_fops = {
.release = kvm_vcpu_release,
.unlocked_ioctl = kvm_vcpu_ioctl,
.compat_ioctl = kvm_vcpu_ioctl,
.mmap = kvm_vcpu_mmap,
};
/*
* Allocates an inode for the vcpu.
*/
static int create_vcpu_fd(struct kvm_vcpu *vcpu)
{
int fd, r;
struct inode *inode;
struct file *file;
atomic_inc(&vcpu->kvm->filp->f_count);
inode = kvmfs_inode(&kvm_vcpu_fops);
if (IS_ERR(inode)) {
r = PTR_ERR(inode);
goto out1;
}
file = kvmfs_file(inode, vcpu);
if (IS_ERR(file)) {
r = PTR_ERR(file);
goto out2;
}
r = get_unused_fd();
if (r < 0)
goto out3;
fd = r;
fd_install(fd, file);
return fd;
out3:
fput(file);
out2:
iput(inode);
out1:
fput(vcpu->kvm->filp);
return r;
}
/*
* Creates some virtual cpus. Good luck creating more than one.
*/
static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
{
int r;
struct kvm_vcpu *vcpu;
struct page *page;
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;
}
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
r = -ENOMEM;
if (!page)
goto out_unlock;
vcpu->run = page_address(page);
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
r = -ENOMEM;
if (!page)
goto out_free_run;
vcpu->pio_data = page_address(page);
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->cr0 = 0x10;
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;
r = create_vcpu_fd(vcpu);
if (r < 0)
goto out_free_vcpus;
return r;
out_free_vcpus:
kvm_free_vcpu(vcpu);
out_free_run:
free_page((unsigned long)vcpu->run);
vcpu->run = NULL;
out_unlock:
mutex_unlock(&vcpu->mutex);
out:
return r;
}
static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
struct kvm_cpuid *cpuid,
struct kvm_cpuid_entry __user *entries)
{
int r;
r = -E2BIG;
if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
goto out;
r = -EFAULT;
if (copy_from_user(&vcpu->cpuid_entries, entries,
cpuid->nent * sizeof(struct kvm_cpuid_entry)))
goto out;
vcpu->cpuid_nent = cpuid->nent;
return 0;
out:
return r;
}
static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
{
if (sigset) {
sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
vcpu->sigset_active = 1;
vcpu->sigset = *sigset;
} else
vcpu->sigset_active = 0;
return 0;
}
/*
* fxsave fpu state. Taken from x86_64/processor.h. To be killed when
* we have asm/x86/processor.h
*/
struct fxsave {
u16 cwd;
u16 swd;
u16 twd;
u16 fop;
u64 rip;
u64 rdp;
u32 mxcsr;
u32 mxcsr_mask;
u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
#ifdef CONFIG_X86_64
u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
#else
u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
#endif
};
static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
vcpu_load(vcpu);
memcpy(fpu->fpr, fxsave->st_space, 128);
fpu->fcw = fxsave->cwd;
fpu->fsw = fxsave->swd;
fpu->ftwx = fxsave->twd;
fpu->last_opcode = fxsave->fop;
fpu->last_ip = fxsave->rip;
fpu->last_dp = fxsave->rdp;
memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
vcpu_put(vcpu);
return 0;
}
static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
vcpu_load(vcpu);
memcpy(fxsave->st_space, fpu->fpr, 128);
fxsave->cwd = fpu->fcw;
fxsave->swd = fpu->fsw;
fxsave->twd = fpu->ftwx;
fxsave->fop = fpu->last_opcode;
fxsave->rip = fpu->last_ip;
fxsave->rdp = fpu->last_dp;
memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
vcpu_put(vcpu);
return 0;
}
static long kvm_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm_vcpu *vcpu = filp->private_data;
void __user *argp = (void __user *)arg;
int r = -EINVAL;
switch (ioctl) {
case KVM_RUN:
r = -EINVAL;
if (arg)
goto out;
r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
break;
case KVM_GET_REGS: {
struct kvm_regs kvm_regs;
memset(&kvm_regs, 0, sizeof kvm_regs);
r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &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, argp, sizeof kvm_regs))
goto out;
r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
if (r)
goto out;
r = 0;
break;
}
case KVM_GET_SREGS: {
struct kvm_sregs kvm_sregs;
memset(&kvm_sregs, 0, sizeof kvm_sregs);
r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &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, argp, sizeof kvm_sregs))
goto out;
r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
if (r)
goto out;
r = 0;
break;
}
case KVM_TRANSLATE: {
struct kvm_translation tr;
r = -EFAULT;
if (copy_from_user(&tr, argp, sizeof tr))
goto out;
r = kvm_vcpu_ioctl_translate(vcpu, &tr);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &tr, sizeof tr))
goto out;
r = 0;
break;
}
case KVM_INTERRUPT: {
struct kvm_interrupt irq;
r = -EFAULT;
if (copy_from_user(&irq, argp, sizeof irq))
goto out;
r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
if (r)
goto out;
r = 0;
break;
}
case KVM_DEBUG_GUEST: {
struct kvm_debug_guest dbg;
r = -EFAULT;
if (copy_from_user(&dbg, argp, sizeof dbg))
goto out;
r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
if (r)
goto out;
r = 0;
break;
}
case KVM_GET_MSRS:
r = msr_io(vcpu, argp, get_msr, 1);
break;
case KVM_SET_MSRS:
r = msr_io(vcpu, argp, do_set_msr, 0);
break;
case KVM_SET_CPUID: {
struct kvm_cpuid __user *cpuid_arg = argp;
struct kvm_cpuid cpuid;
r = -EFAULT;
if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
goto out;
r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
if (r)
goto out;
break;
}
case KVM_SET_SIGNAL_MASK: {
struct kvm_signal_mask __user *sigmask_arg = argp;
struct kvm_signal_mask kvm_sigmask;
sigset_t sigset, *p;
p = NULL;
if (argp) {
r = -EFAULT;
if (copy_from_user(&kvm_sigmask, argp,
sizeof kvm_sigmask))
goto out;
r = -EINVAL;
if (kvm_sigmask.len != sizeof sigset)
goto out;
r = -EFAULT;
if (copy_from_user(&sigset, sigmask_arg->sigset,
sizeof sigset))
goto out;
p = &sigset;
}
r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
break;
}
case KVM_GET_FPU: {
struct kvm_fpu fpu;
memset(&fpu, 0, sizeof fpu);
r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &fpu, sizeof fpu))
goto out;
r = 0;
break;
}
case KVM_SET_FPU: {
struct kvm_fpu fpu;
r = -EFAULT;
if (copy_from_user(&fpu, argp, sizeof fpu))
goto out;
r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
if (r)
goto out;
r = 0;
break;
}
default:
;
}
out:
return r;
}
static long kvm_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm *kvm = filp->private_data;
void __user *argp = (void __user *)arg;
int r = -EINVAL;
switch (ioctl) {
case KVM_CREATE_VCPU:
r = kvm_vm_ioctl_create_vcpu(kvm, arg);
if (r < 0)
goto out;
break;
case KVM_SET_MEMORY_REGION: {
struct kvm_memory_region kvm_mem;
r = -EFAULT;
if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
goto out;
r = kvm_vm_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, argp, sizeof log))
goto out;
r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
if (r)
goto out;
break;
}
case KVM_SET_MEMORY_ALIAS: {
struct kvm_memory_alias alias;
r = -EFAULT;
if (copy_from_user(&alias, argp, sizeof alias))
goto out;
r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
if (r)
goto out;
break;
}
default:
;
}
out:
return r;
}
static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
unsigned long address,
int *type)
{
struct kvm *kvm = vma->vm_file->private_data;
unsigned long pgoff;
struct page *page;
*type = VM_FAULT_MINOR;
pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
page = gfn_to_page(kvm, pgoff);
if (!page)
return NOPAGE_SIGBUS;
get_page(page);
return page;
}
static struct vm_operations_struct kvm_vm_vm_ops = {
.nopage = kvm_vm_nopage,
};
static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
{
vma->vm_ops = &kvm_vm_vm_ops;
return 0;
}
static struct file_operations kvm_vm_fops = {
.release = kvm_vm_release,
.unlocked_ioctl = kvm_vm_ioctl,
.compat_ioctl = kvm_vm_ioctl,
.mmap = kvm_vm_mmap,
};
static int kvm_dev_ioctl_create_vm(void)
{
int fd, r;
struct inode *inode;
struct file *file;
struct kvm *kvm;
inode = kvmfs_inode(&kvm_vm_fops);
if (IS_ERR(inode)) {
r = PTR_ERR(inode);
goto out1;
}
kvm = kvm_create_vm();
if (IS_ERR(kvm)) {
r = PTR_ERR(kvm);
goto out2;
}
file = kvmfs_file(inode, kvm);
if (IS_ERR(file)) {
r = PTR_ERR(file);
goto out3;
}
kvm->filp = file;
r = get_unused_fd();
if (r < 0)
goto out4;
fd = r;
fd_install(fd, file);
return fd;
out4:
fput(file);
out3:
kvm_destroy_vm(kvm);
out2:
iput(inode);
out1:
return r;
}
static long kvm_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
void __user *argp = (void __user *)arg;
long r = -EINVAL;
switch (ioctl) {
case KVM_GET_API_VERSION:
r = -EINVAL;
if (arg)
goto out;
r = KVM_API_VERSION;
break;
case KVM_CREATE_VM:
r = -EINVAL;
if (arg)
goto out;
r = kvm_dev_ioctl_create_vm();
break;
case KVM_GET_MSR_INDEX_LIST: {
struct kvm_msr_list __user *user_msr_list = argp;
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 + ARRAY_SIZE(emulated_msrs);
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;
if (copy_to_user(user_msr_list->indices
+ num_msrs_to_save * sizeof(u32),
&emulated_msrs,
ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
goto out;
r = 0;
break;
}
case KVM_CHECK_EXTENSION:
/*
* No extensions defined at present.
*/
r = 0;
break;
case KVM_GET_VCPU_MMAP_SIZE:
r = -EINVAL;
if (arg)
goto out;
r = 2 * PAGE_SIZE;
break;
default:
;
}
out:
return r;
}
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,
};
static struct miscdevice kvm_dev = {
KVM_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, NULL, 0, 1);
}
return NOTIFY_OK;
}
static struct notifier_block kvm_reboot_notifier = {
.notifier_call = kvm_reboot,
.priority = 0,
};
/*
* Make sure that a cpu that is being hot-unplugged does not have any vcpus
* cached on it.
*/
static void decache_vcpus_on_cpu(int cpu)
{
struct kvm *vm;
struct kvm_vcpu *vcpu;
int i;
spin_lock(&kvm_lock);
list_for_each_entry(vm, &vm_list, vm_list)
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
vcpu = &vm->vcpus[i];
/*
* If the vcpu is locked, then it is running on some
* other cpu and therefore it is not cached on the
* cpu in question.
*
* If it's not locked, check the last cpu it executed
* on.
*/
if (mutex_trylock(&vcpu->mutex)) {
if (vcpu->cpu == cpu) {
kvm_arch_ops->vcpu_decache(vcpu);
vcpu->cpu = -1;
}
mutex_unlock(&vcpu->mutex);
}
}
spin_unlock(&kvm_lock);
}
static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
void *v)
{
int cpu = (long)v;
switch (val) {
case CPU_DOWN_PREPARE:
case CPU_UP_CANCELED:
printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
cpu);
decache_vcpus_on_cpu(cpu);
smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
NULL, 0, 1);
break;
case CPU_ONLINE:
printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
cpu);
smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
NULL, 0, 1);
break;
}
return NOTIFY_OK;
}
static struct notifier_block kvm_cpu_notifier = {
.notifier_call = kvm_cpu_hotplug,
.priority = 20, /* must be > scheduler priority */
};
static u64 stat_get(void *_offset)
{
unsigned offset = (long)_offset;
u64 total = 0;
struct kvm *kvm;
struct kvm_vcpu *vcpu;
int i;
spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list)
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
vcpu = &kvm->vcpus[i];
total += *(u32 *)((void *)vcpu + offset);
}
spin_unlock(&kvm_lock);
return total;
}
static void stat_set(void *offset, u64 val)
{
}
DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
static __init void kvm_init_debug(void)
{
struct kvm_stats_debugfs_item *p;
debugfs_dir = debugfs_create_dir("kvm", NULL);
for (p = debugfs_entries; p->name; ++p)
p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
(void *)(long)p->offset,
&stat_fops);
}
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);
}
static int kvm_suspend(struct sys_device *dev, pm_message_t state)
{
decache_vcpus_on_cpu(raw_smp_processor_id());
on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
return 0;
}
static int kvm_resume(struct sys_device *dev)
{
on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
return 0;
}
static struct sysdev_class kvm_sysdev_class = {
set_kset_name("kvm"),
.suspend = kvm_suspend,
.resume = kvm_resume,
};
static struct sys_device kvm_sysdev = {
.id = 0,
.cls = &kvm_sysdev_class,
};
hpa_t bad_page_address;
static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
}
static struct file_system_type kvm_fs_type = {
.name = "kvmfs",
.get_sb = kvmfs_get_sb,
.kill_sb = kill_anon_super,
};
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)
goto out;
on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
r = register_cpu_notifier(&kvm_cpu_notifier);
if (r)
goto out_free_1;
register_reboot_notifier(&kvm_reboot_notifier);
r = sysdev_class_register(&kvm_sysdev_class);
if (r)
goto out_free_2;
r = sysdev_register(&kvm_sysdev);
if (r)
goto out_free_3;
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:
sysdev_unregister(&kvm_sysdev);
out_free_3:
sysdev_class_unregister(&kvm_sysdev_class);
out_free_2:
unregister_reboot_notifier(&kvm_reboot_notifier);
unregister_cpu_notifier(&kvm_cpu_notifier);
out_free_1:
on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
kvm_arch_ops->hardware_unsetup();
out:
kvm_arch_ops = NULL;
return r;
}
void kvm_exit_arch(void)
{
misc_deregister(&kvm_dev);
sysdev_unregister(&kvm_sysdev);
sysdev_class_unregister(&kvm_sysdev_class);
unregister_reboot_notifier(&kvm_reboot_notifier);
unregister_cpu_notifier(&kvm_cpu_notifier);
on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
kvm_arch_ops->hardware_unsetup();
kvm_arch_ops = NULL;
}
static __init int kvm_init(void)
{
static struct page *bad_page;
int r;
r = kvm_mmu_module_init();
if (r)
goto out4;
r = register_filesystem(&kvm_fs_type);
if (r)
goto out3;
kvmfs_mnt = kern_mount(&kvm_fs_type);
r = PTR_ERR(kvmfs_mnt);
if (IS_ERR(kvmfs_mnt))
goto out2;
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 0;
out:
kvm_exit_debug();
mntput(kvmfs_mnt);
out2:
unregister_filesystem(&kvm_fs_type);
out3:
kvm_mmu_module_exit();
out4:
return r;
}
static __exit void kvm_exit(void)
{
kvm_exit_debug();
__free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
mntput(kvmfs_mnt);
unregister_filesystem(&kvm_fs_type);
kvm_mmu_module_exit();
}
module_init(kvm_init)
module_exit(kvm_exit)
EXPORT_SYMBOL_GPL(kvm_init_arch);
EXPORT_SYMBOL_GPL(kvm_exit_arch);
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