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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm

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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm:
  KVM: disable writeback for 0x0f 0x01 instructions.
  KVM: Fix removal of nx capability from guest cpuid
  Revert "KVM: Avoid useless memory write when possible"
  KVM: Fix unlikely kvm_create vs decache_vcpus_on_cpu race
  KVM: Correctly handle writes crossing a page boundary
This commit is contained in:
Linus Torvalds 2007-07-25 11:01:10 -07:00
commit a9417357cf
2 changed files with 33 additions and 13 deletions
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34
drivers/kvm/kvm_main.c
View file

@ -297,9 +297,6 @@ static struct kvm *kvm_create_vm(void)
kvm_io_bus_init(&kvm->pio_bus);
spin_lock_init(&kvm->lock);
INIT_LIST_HEAD(&kvm->active_mmu_pages);
spin_lock(&kvm_lock);
list_add(&kvm->vm_list, &vm_list);
spin_unlock(&kvm_lock);
kvm_io_bus_init(&kvm->mmio_bus);
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
struct kvm_vcpu *vcpu = &kvm->vcpus[i];
@ -309,6 +306,9 @@ static struct kvm *kvm_create_vm(void)
vcpu->kvm = kvm;
vcpu->mmu.root_hpa = INVALID_PAGE;
}
spin_lock(&kvm_lock);
list_add(&kvm->vm_list, &vm_list);
spin_unlock(&kvm_lock);
return kvm;
}
@ -1070,15 +1070,13 @@ static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
return 0;
mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
virt = kmap_atomic(page, KM_USER0);
if (memcmp(virt + offset_in_page(gpa), val, bytes)) {
kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes);
memcpy(virt + offset_in_page(gpa), val, bytes);
}
kunmap_atomic(virt, KM_USER0);
return 1;
}
static int emulator_write_emulated(unsigned long addr,
static int emulator_write_emulated_onepage(unsigned long addr,
const void *val,
unsigned int bytes,
struct x86_emulate_ctxt *ctxt)
@ -1113,6 +1111,26 @@ static int emulator_write_emulated(unsigned long addr,
return X86EMUL_CONTINUE;
}
static int emulator_write_emulated(unsigned long addr,
const void *val,
unsigned int bytes,
struct x86_emulate_ctxt *ctxt)
{
/* Crossing a page boundary? */
if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
int rc, now;
now = -addr & ~PAGE_MASK;
rc = emulator_write_emulated_onepage(addr, val, now, ctxt);
if (rc != X86EMUL_CONTINUE)
return rc;
addr += now;
val += now;
bytes -= now;
}
return emulator_write_emulated_onepage(addr, val, bytes, ctxt);
}
static int emulator_cmpxchg_emulated(unsigned long addr,
const void *old,
const void *new,
@ -2414,9 +2432,9 @@ static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
break;
}
}
if (entry && (entry->edx & EFER_NX) && !(efer & EFER_NX)) {
if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
entry->edx &= ~(1 << 20);
printk(KERN_INFO ": guest NX capability removed\n");
printk(KERN_INFO "kvm: guest NX capability removed\n");
}
}

2
drivers/kvm/x86_emulate.c
View file

@ -1178,6 +1178,8 @@ x86_emulate_memop(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
twobyte_insn:
switch (b) {
case 0x01: /* lgdt, lidt, lmsw */
/* Disable writeback. */
no_wb = 1;
switch (modrm_reg) {
u16 size;
unsigned long address;