linux-kernel - Re: [PATCH v3 5/6] KVM: x86: make several AVIC callbacks optional

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Date:   Fri, 18 Feb 2022 18:17:50 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v3 5/6] KVM: x86: make several AVIC callbacks optional

On 2/18/22 17:23, Sean Christopherson wrote:
> The "AVIC" callbacks are being deleted, not
> made optional, it's kvm_x86_ops' APICv hooks that are becoming optional.

Maybe "make several APIC virtualization callbacks optional".

>> +KVM_X86_OP_OPTIONAL(apicv_post_state_restore)
>
> apicv_post_state_restore() isn't conditional, it's implemented and wired up
> unconditionally by both VMX and SVM.

True, on the other hand there's no reason why a hypothetical third 
vendor would have to support it.  The call is conditional to 
apicv_active being true.

Paolo