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authorGleb Natapov <gleb@redhat.com>2013-05-16 11:55:51 +0300
committerGleb Natapov <gleb@redhat.com>2013-05-16 11:55:51 +0300
commit35af577aacb2fd2a6b407953044aea1cf0546fad (patch)
tree0bc805d79aa86c685e9f4b2a0e1d943ac61df601 /arch/x86/kvm
parent0061d53daf26ff713ab43ab84ae5c44b5edbefa9 (diff)
KVM: MMU: clenaup locking in mmu_free_roots()
Do locking around each case separately instead of having one lock and two unlocks. Move root_hpa assignment out of the lock. Signed-off-by: Gleb Natapov <gleb@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/mmu.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 40d7b2ddc6c5..f8ca2f351395 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2869,22 +2869,25 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu)
if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
return;
- spin_lock(&vcpu->kvm->mmu_lock);
+
if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL &&
(vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL ||
vcpu->arch.mmu.direct_map)) {
hpa_t root = vcpu->arch.mmu.root_hpa;
+ spin_lock(&vcpu->kvm->mmu_lock);
sp = page_header(root);
--sp->root_count;
if (!sp->root_count && sp->role.invalid) {
kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list);
kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
}
- vcpu->arch.mmu.root_hpa = INVALID_PAGE;
spin_unlock(&vcpu->kvm->mmu_lock);
+ vcpu->arch.mmu.root_hpa = INVALID_PAGE;
return;
}
+
+ spin_lock(&vcpu->kvm->mmu_lock);
for (i = 0; i < 4; ++i) {
hpa_t root = vcpu->arch.mmu.pae_root[i];