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KVM: MMU: Add locking around kvm_mmu_slot_remove_write_access() 

It was generally safe due to slots_lock being held for write, but it wasn't
very nice.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-08-27 16:32:24 +03:00
parent bc2d429979
commit 2245a28fe2
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/mmu.c
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@ -2097,6 +2097,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
{ {
struct kvm_mmu_page *sp; struct kvm_mmu_page *sp;
spin_lock(&kvm->mmu_lock);
list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) { list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) {
int i; int i;
u64 *pt; u64 *pt;
@ -2110,6 +2111,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
if (pt[i] & PT_WRITABLE_MASK) if (pt[i] & PT_WRITABLE_MASK)
pt[i] &= ~PT_WRITABLE_MASK; pt[i] &= ~PT_WRITABLE_MASK;
} }
spin_unlock(&kvm->mmu_lock);
} }
void kvm_mmu_zap_all(struct kvm *kvm) void kvm_mmu_zap_all(struct kvm *kvm)