diff options
| -rw-r--r-- | drivers/kvm/kvm_main.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index bfb1b6de058..5dee3024579 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -803,11 +803,14 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) goto out; - mutex_lock(&kvm->lock); - kvm_mmu_slot_remove_write_access(kvm, log->slot); - kvm_flush_remote_tlbs(kvm); - memset(memslot->dirty_bitmap, 0, n); - mutex_unlock(&kvm->lock); + /* If nothing is dirty, don't bother messing with page tables. */ + if (any) { + mutex_lock(&kvm->lock); + kvm_mmu_slot_remove_write_access(kvm, log->slot); + kvm_flush_remote_tlbs(kvm); + memset(memslot->dirty_bitmap, 0, n); + mutex_unlock(&kvm->lock); + } r = 0; |