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

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Message-ID: <09ab0486-40a9-3793-fdcf-bcbc6d3afe70@amd.com>
Date:   Thu, 30 Sep 2021 09:12:51 -0500
From:   Babu Moger <babu.moger@....com>
To:     Paolo Bonzini <pbonzini@...hat.com>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org
Cc:     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 9/30/21 8:41 AM, Paolo Bonzini wrote:
> On 29/09/21 22:27, Babu Moger wrote:
>>
>> On 9/28/21 11:04 AM, Paolo Bonzini wrote:
>>> On 24/09/21 03:15, Babu Moger wrote:
>>>>    arch/x86/include/asm/cpufeatures.h |    1 +
>>>>    arch/x86/kvm/cpuid.c               |    2 +-
>>>>    2 files changed, 2 insertions(+), 1 deletion(-)
>>> Queued, with a private #define instead of the one in cpufeatures.h:
>> Thanks Paolo. Don't we need change in guest_has_spec_ctrl_msr?
> 
> Not strictly necessary unless you expect processors to have PSFD and not
> SSBD; but yes it's cleaner.

It is always both SSBD and PSFD together. We are good.Thanks

Tested-By: Babu Moger <babu.moger@....com>