KVM: MMU: fix wrong not write protected sp report
The audit code reports some sp not write protected in current code, it's just the
bug in audit_write_protection(), since:
- the invalid sp not need write protected
- using uninitialize local variable('gfn')
- call kvm_mmu_audit() out of mmu_lock's protection
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 1c784b9..68575dc 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3708,16 +3708,17 @@
struct kvm_memory_slot *slot;
unsigned long *rmapp;
u64 *spte;
- gfn_t gfn;
list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
if (sp->role.direct)
continue;
if (sp->unsync)
continue;
+ if (sp->role.invalid)
+ continue;
slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
- rmapp = &slot->rmap[gfn - slot->base_gfn];
+ rmapp = &slot->rmap[sp->gfn - slot->base_gfn];
spte = rmap_next(vcpu->kvm, rmapp, NULL);
while (spte) {