linux-kernel - Re: [PATCH 1/3] KVM: x86: fix reporting of AMD speculation bug CPUID leaf

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Message-ID: <CALMp9eQoHLngzb5v9aqxpJ39OszXLjdm+sWbHdeOk2JaPofv5Q@mail.gmail.com>
Date:   Wed, 21 Aug 2019 12:45:29 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>, jmattson@...hat.com,
        Eduardo Habkost <ehabkost@...hat.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 1/3] KVM: x86: fix reporting of AMD speculation bug CPUID leaf

On Wed, Aug 21, 2019 at 1:27 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> The AMD_* bits have to be set from the vendor-independent
> feature and bug flags, because KVM_GET_SUPPORTED_CPUID does not care
> about the vendor and they should be set on Intel processors as well.
> On top of this, SSBD, STIBP and AMD_SSB_NO bit were not set, and
> VIRT_SSBD does not have to be added manually because it is a
> cpufeature that comes directly from the host's CPUID bit.
>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>