[PATCH 4/4] KVM: VMX: Respect interrupt window in big real mode

Avi Kivity
2010-09-19T12:34:11Z

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

Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/x86/kvm/vmx.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2572153..1a5ecfd 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3588,8 +3588,17 @@ 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) {
--
1.7.2.3