KVM: VMX: Prevent exit handler from running if emulating due to invalid state
If we've just emulated an instruction, we won't have any valid exit
reason and associated information.
Fix by moving the clearing of the emulation_required flag to the exit handler.
This way the exit handler can notice that we've been emulating and abort
early.
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a6598cb..a309be6 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3130,7 +3130,6 @@
static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
struct kvm_run *kvm_run)
{
- struct vcpu_vmx *vmx = to_vmx(vcpu);
int err;
preempt_enable();
@@ -3155,11 +3154,6 @@
local_irq_disable();
preempt_disable();
-
- /* Guest state should be valid now except if we need to
- * emulate an MMIO */
- if (guest_state_valid(vcpu))
- vmx->emulation_required = 0;
}
/*
@@ -3208,8 +3202,11 @@
/* If we need to emulate an MMIO from handle_invalid_guest_state
* we just return 0 */
- if (vmx->emulation_required && emulate_invalid_guest_state)
+ if (vmx->emulation_required && emulate_invalid_guest_state) {
+ if (guest_state_valid(vcpu))
+ vmx->emulation_required = 0;
return 0;
+ }
/* Access CR3 don't cause VMExit in paging mode, so we need
* to sync with guest real CR3. */