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authorAvi Kivity <avi@qumranet.com>2009-08-06 14:39:46 -0300
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-08 20:17:04 -0700
commitc832f513b1ebe93e0a2c71a98f319da4ce560f7f (patch)
tree7812d6cc3fde7fa6e3619a1fd21adaf8d66c69d6 /arch
parent2b52d454ea2217f9422aee3847aa4678e93fa9e0 (diff)
KVM: MMU: Add locking around kvm_mmu_slot_remove_write_access()
(cherry picked from commit 2245a28fe2e6fdb1bdabc4dcde1ea3a5c37e2a9e) 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/mmu.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 3da2508eb22a..32aa0b814842 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2055,6 +2055,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
{
struct kvm_mmu_page *sp;
+ spin_lock(&kvm->mmu_lock);
list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) {
int i;
u64 *pt;
@@ -2068,6 +2069,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
if (pt[i] & PT_WRITABLE_MASK)
pt[i] &= ~PT_WRITABLE_MASK;
}
+ spin_unlock(&kvm->mmu_lock);
}
void kvm_mmu_zap_all(struct kvm *kvm)