On Wed, Mar 30, 2011 at 01:30:28PM -0300, Marcelo Tosatti wrote:
>
> Based on Gleb's idea, fix race between nmi injection and enabling
> nmi window in a simpler way.
>
> Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
>
But we need to revert the patch that introduced use of request for NMI
first. Otherwise NMI will not be delivered, no?
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index a6a129f..9a7cc1be 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -5152,6 +5152,7 @@ static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu)
> static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
> {
> int r;
> + int nmi_pending;
> bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
> vcpu->run->request_interrupt_window;
>
> @@ -5195,11 +5196,13 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
> if (unlikely(r))
> goto out;
>
> + nmi_pending = ACCESS_ONCE(vcpu->arch.nmi_pending);
> +
> if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
> inject_pending_event(vcpu);
>
> /* enable NMI/IRQ window open exits if needed */
> - if (vcpu->arch.nmi_pending)
> + if (nmi_pending)
> kvm_x86_ops->enable_nmi_window(vcpu);
> else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
> kvm_x86_ops->enable_irq_window(vcpu);
--
Gleb.
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