linux-kernel - Re: [PATCH v4 12/15] KVM: SVM: Introduce hybrid-AVIC mode

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Message-ID: <b3047d27-9681-6b9b-f747-c5428a250b02@amd.com>
Date:   Mon, 9 May 2022 18:23:17 +0700
From:   "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     pbonzini@...hat.com, mlevitsk@...hat.com, seanjc@...gle.com,
        joro@...tes.org, jon.grimm@....com, wei.huang2@....com,
        terry.bowman@....com, Maxim Levitsky <mlevisk@...hat.com>
Subject: Re: [PATCH v4 12/15] KVM: SVM: Introduce hybrid-AVIC mode

Maxim / Paolo,

On 5/8/2022 9:39 AM, Suravee Suthikulpanit wrote:
> Currently, AVIC is inhibited when booting a VM w/ x2APIC support.
> because AVIC cannot virtualize x2APIC MSR register accesses.
> However, the AVIC doorbell can be used to accelerate interrupt
> injection into a running vCPU, while all guest accesses to x2APIC MSRs
> will be intercepted and emulated by KVM.
> 
> With hybrid-AVIC support, the APICV_INHIBIT_REASON_X2APIC is
> no longer enforced.
> 
> Suggested-by: Maxim Levitsky<mlevitsk@...hat.com>
> Reviewed-by: Maxim Levitsky<mlevisk@...hat.com>

Sorry for a typo here in the email of the "Reviewed-by" line.

Suravee