KVM: MMU: Flush tlbs after clearing write permission when accessing dirty log

Otherwise, the cpu may allow writes to the tracked pages, and we lose
some display bits or fail to migrate correctly.

Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 5052acdc0a77f79303beafcdbfbc4aab69ec0636..853a2889b202aa6746562fb9658260bbe495b489 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2111,6 +2111,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
                        if (pt[i] & PT_WRITABLE_MASK)
                                pt[i] &= ~PT_WRITABLE_MASK;
        }
+       kvm_flush_remote_tlbs(kvm);
        spin_unlock(&kvm->mmu_lock);
 }