linux-kernel - Re: [PATCH] x86/kvm: Introduce boot parameter no-kvm-pvipi

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Date:   Wed, 20 Oct 2021 20:22:53 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     zhenwei pi <pizhenwei@...edance.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Wanpeng Li <wanpengli@...cent.com>,
        Sean Christopherson <seanjc@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-doc@...r.kernel.org
Subject: Re: [PATCH] x86/kvm: Introduce boot parameter no-kvm-pvipi

On Wed, 20 Oct 2021 at 20:08, zhenwei pi <pizhenwei@...edance.com> wrote:
>
> Although host side exposes KVM PV SEND IPI feature to guest side,
> guest should still have a chance to disable it.
>
> A typicall case of this parameter:
> If the host AMD server enables AVIC feature, the flat mode of APIC
> get better performance in the guest.

Hmm, I didn't find enough valuable information in your posting. We
observe AMD a lot before.
https://lore.kernel.org/all/CANRm+Cx597FNRUCyVz1D=B6Vs2GX3Sw57X7Muk+yMpi_hb+v1w@mail.gmail.com/T/#u

    Wanpeng