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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CANRm+CxAVA-L0wjm72eohXXWvh9fS7wVFzfKHuEjrsiRFuk9fg@mail.gmail.com>
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