linux-kernel - Re: [PATCH] x86: KVM: Add common feature flag for AMD's PSFD

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Message-ID: <167961285281.2555533.5982438178105479790.b4-ty@google.com>
Date:   Fri, 24 Mar 2023 16:38:14 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH] x86: KVM: Add common feature flag for AMD's PSFD

On Tue, 24 Jan 2023 19:45:19 +0000, Sean Christopherson wrote:
> Use a common X86_FEATURE_* flag for AMD's PSFD, and suppress it from
> /proc/cpuinfo via the standard method of an empty string instead of
> hacking in a one-off "private" #define in KVM.  The request that led to
> KVM defining its own flag was really just that the feature not show up
> in /proc/cpuinfo, and additional patches+discussions in the interim have
> clarified that defining flags in cpufeatures.h purely so that KVM can
> advertise features to userspace is ok so long as the kernel already uses
> a word to track the associated CPUID leaf.
> 
> [...]

Applied to kvm-x86 misc, thanks!

[1/1] x86: KVM: Add common feature flag for AMD's PSFD
      https://github.com/kvm-x86/linux/commit/3d8f61bf8bcd

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes