On Thu, May 17, 2012 at 10:28:41AM +0300, Gleb Natapov wrote:
> On Wed, May 16, 2012 at 10:07:58PM +0300, Michael S. Tsirkin wrote:
> > > This code is reached from kvm_cpu_get_interrupt(), but this function will
> > > not be called in above scenario.
> >
> > I think I see. So this shall fix it also makes code cleaner
> > (no -2 hack). Right? kvm_apic_has_interrupt is called correct?
> >
> > diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> > index b4f7013..5a38e34 100644
> > --- a/arch/x86/kvm/lapic.c
> > +++ b/arch/x86/kvm/lapic.c
> > @@ -1273,8 +1273,12 @@ int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
> > highest_irr = apic_find_highest_irr(apic);
> > if (highest_irr == -1)
> > return -1;
> > - if (((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
> > - return -2;
> > + /* Detect interrupt nesting and disable EOI optimization */
> > + if ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)) {
> > + if (pv_eoi_enabled(vcpu))
> > + pv_eoi_clr_pending(vcpu);
> > + return -1;
> > + }
> > return highest_irr;
> > }
> >
> I do not like it. kvm_apic_has_interrupt() does not suppose to mutate
> state.
OK, so let's rename it so it's clear it can mutate state?
> > @@ -1306,10 +1310,6 @@ int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
> > int vector = kvm_apic_has_interrupt(vcpu);
> > struct kvm_lapic *apic = vcpu->arch.apic;
> >
> > - /* Detect interrupt nesting and disable EOI optimization */
> > - if (pv_eoi_enabled(vcpu) && vector == -2)
> > - pv_eoi_clr_pending(vcpu);
> > -
> > if (vector < 0)
> > return -1;
> >
>
> --
> Gleb.
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