Re: [PATCH v2 1/8] KVM: VMX: No need to clear pending NMI/interrupt on inject realmode interrupt

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On 02/12/17 01:45, Jim Mattson wrote:
Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>
Thanks for the review.


On Tue, Nov 21, 2017 at 7:30 AM, Liran Alon <liran.alon@xxxxxxxxxx> wrote:
kvm_inject_realmode_interrupt() is called from one of the injection
functions which writes event-injection to VMCS: vmx_queue_exception(),
vmx_inject_irq() and vmx_inject_nmi().

All these functions are called just to cause an event-injection to
guest. They are not responsible of manipulating the event-pending
flag. The only purpose of kvm_inject_realmode_interrupt() should be
to emulate real-mode interrupt-injection.

This was also incorrect when called from vmx_queue_exception().

Signed-off-by: Liran Alon <liran.alon@xxxxxxxxxx>
Reviewed-by: Nikita Leshenko <nikita.leshchenko@xxxxxxxxxx>
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
---
  arch/x86/kvm/x86.c | 5 -----
  1 file changed, 5 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 34c85aa2e2d1..c85fc4406a7d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5411,11 +5411,6 @@ int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
         kvm_rip_write(vcpu, ctxt->eip);
         kvm_set_rflags(vcpu, ctxt->eflags);

-       if (irq == NMI_VECTOR)
-               vcpu->arch.nmi_pending = 0;
-       else
-               vcpu->arch.interrupt.pending = false;
-
         return EMULATE_DONE;
  }
  EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
--
1.9.1




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