KVM: VMX: Don't VMREAD VM_EXIT_INTR_INFO unconditionally
Only read it if we're going to use it later.
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 51aa827..f95f48b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3902,6 +3902,7 @@
|| vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI))
return;
+ vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
exit_intr_info = vmx->exit_intr_info;
/* Handle machine checks before interrupts are enabled */
@@ -3919,7 +3920,7 @@
static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
{
- u32 exit_intr_info = vmx->exit_intr_info;
+ u32 exit_intr_info;
bool unblock_nmi;
u8 vector;
bool idtv_info_valid;
@@ -3929,6 +3930,11 @@
if (cpu_has_virtual_nmis()) {
if (vmx->nmi_known_unmasked)
return;
+ /*
+ * Can't use vmx->exit_intr_info since we're not sure what
+ * the exit reason is.
+ */
+ exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
/*
@@ -4176,7 +4182,6 @@
vmx->launched = 1;
vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
- vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
vmx_complete_atomic_exit(vmx);
vmx_recover_nmi_blocking(vmx);