linux-kernel - Re: [PATCH 11/19] KVM: SVM: Add helper to perform final AVIC "kick" of single vCPU

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Message-ID: <Yw95XR59VQSbVlY9@google.com>
Date:   Wed, 31 Aug 2022 15:08:13 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Li RongQing <lirongqing@...du.com>
Subject: Re: [PATCH 11/19] KVM: SVM: Add helper to perform final AVIC "kick"
 of single vCPU

On Wed, Aug 31, 2022, Maxim Levitsky wrote:
> On Wed, 2022-08-31 at 00:34 +0000, Sean Christopherson wrote:
> > @@ -455,13 +461,8 @@ static void avic_kick_target_vcpus(struct kvm *kvm, struct kvm_lapic *source,
> >  	 */
> >  	kvm_for_each_vcpu(i, vcpu, kvm) {
> >  		if (kvm_apic_match_dest(vcpu, source, icrl & APIC_SHORT_MASK,
> > -					dest, icrl & APIC_DEST_MASK)) {
> > -			vcpu->arch.apic->irr_pending = true;
> > -			svm_complete_interrupt_delivery(vcpu,
> > -							icrl & APIC_MODE_MASK,
> > -							icrl & APIC_INT_LEVELTRIG,
> > -							icrl & APIC_VECTOR_MASK);
> > -		}
> > +					dest, icrl & APIC_DEST_MASK))
> > +			avic_kick_vcpu(vcpu, icrl);
> >  	}
> >  }
> >  
> 
> I don't know what I think about this, sometimes *minor* code duplication
> might actually be a good thing, as it is easier to read the code, but I don't
> have much against this as well.
> 
> I am not sure if before or after this code is more readable.

I don't have a strong opinion either.  I think I prefer having the helper, but
have no objection to leaving things as is.  Originally I was thinking there was
going to be a third call site, but that didn't happen.