linux-kernel - Re: [RFC] KVM: x86: SVM: don't expose PV_SEND

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Date:   Mon, 8 Nov 2021 12:18:11 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     zhenwei pi <pizhenwei@...edance.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Kele Huang <huangkele@...edance.com>
Cc:     chaiwen.cc@...edance.com, xieyongji@...edance.com,
        dengliang.1214@...edance.com, wanpengli@...cent.com,
        seanjc@...gle.com, Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC] KVM: x86: SVM: don't expose PV_SEND_IPI feature with AVIC

On 11/8/21 12:14, zhenwei pi wrote:
> I don't yet know if there is a solution to this which doesn't
> involve some management software decision (e.g libvirt or higher).

If we use a new hint, there's no problems with migration from/to older 
QEMU and libvirt's host-model/host-passthrough would pick up the bit 
automatically.

(I'm not sure if libvirt knows that hints can change across migration, 
though).

Paolo