linux-kernel - Re: [PATCH 02/19] KVM: SVM: Don't put/load AVIC when setting virtual APIC mode

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Date:   Wed, 31 Aug 2022 16:33:27 +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 02/19] KVM: SVM: Don't put/load AVIC when setting virtual
 APIC mode

On Wed, Aug 31, 2022, Maxim Levitsky wrote:
> > @@ -1118,6 +1107,16 @@ void avic_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
> >  		avic_deactivate_vmcb(svm);
> >  	}
> >  	vmcb_mark_dirty(vmcb, VMCB_AVIC);
> > +}
> > +
> > +void avic_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
> > +{
> > +	bool activated = kvm_vcpu_apicv_active(vcpu);
> > +
> > +	if (!enable_apicv)
> > +		return;
> > +
> > +	avic_set_virtual_apic_mode(vcpu);
> 
> This call is misleading - this will usually be called
> when avic mode didn't change - I think we need a better name for
> avic_set_virtual_apic_mode.

I don't disagree, but I'm having trouble coming up with a succinct alternative.
The helper primarily configures the VMCB, but the call to
avic_apicv_post_state_restore() makes avic_refresh_vmcb_controls() undesirable.

Maybe avic_refresh_virtual_apic_mode()?