linux-kernel - Re: [PATCH] KVM: x86: Expose Predictive Store Forwarding Disable

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Message-ID: <YVGkDPbQmdwSw6Ff@zn.tnic>
Date:   Mon, 27 Sep 2021 12:59:24 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Babu Moger <babu.moger@....com>
Cc:     tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
        pbonzini@...hat.com, hpa@...or.com, seanjc@...gle.com,
        vkuznets@...hat.com, wanpengli@...cent.com, jmattson@...gle.com,
        joro@...tes.org, tony.luck@...el.com, peterz@...radead.org,
        kyung.min.park@...el.com, wei.huang2@....com, jgross@...e.com,
        andrew.cooper3@...rix.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: Expose Predictive Store Forwarding Disable

On Thu, Sep 23, 2021 at 08:15:28PM -0500, Babu Moger wrote:
> Linux kernel does not have the interface to enable/disable PSFD yet. Plan
> here is to expose the PSFD technology to KVM so that the guest kernel can
> make use of it if they wish to.

Why should the guest kernel expose it if we said that for now we want to
disable it with the SSBD control?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette