KVM: VMX: Respect interrupt window in big real mode

If an interrupt is pending, we need to stop emulation so we
can inject it.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9d3f972aa19c..28c72da93a1b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3582,8 +3582,17 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
         struct vcpu_vmx *vmx = to_vmx(vcpu);
         enum emulation_result err = EMULATE_DONE;
         int ret = 1;
+        u32 cpu_exec_ctrl;
+        bool intr_window_requested;
+
+        cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
+        intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING;
 
         while (!guest_state_valid(vcpu)) {
+                if (intr_window_requested
+                    && (kvm_get_rflags(&vmx->vcpu) & X86_EFLAGS_IF))
+                        return handle_interrupt_window(&vmx->vcpu);
+
                 err = emulate_instruction(vcpu, 0, 0, 0);
 
                 if (err == EMULATE_DO_MMIO) {