linux-kernel - Re: [PATCH v2] x86: KVM: Add feature flag for CPUID.80000021H:EAX[bit 1]

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Message-ID: <169766229957.1906201.16765121392662291005.b4-ty@google.com>
Date:   Fri, 20 Oct 2023 15:56:21 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Jiaxi Chen <jiaxi.chen@...ux.intel.com>,
        Kim Phillips <kim.phillips@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH v2] x86: KVM: Add feature flag for CPUID.80000021H:EAX[bit 1]

On Wed, 04 Oct 2023 20:12:37 -0700, Jim Mattson wrote:
> Define an X86_FEATURE_* flag for CPUID.80000021H:EAX.[bit 1], and
> advertise the feature to userspace via KVM_GET_SUPPORTED_CPUID.
> 
> Per AMD's "Processor Programming Reference (PPR) for AMD Family 19h
> Model 61h, Revision B1 Processors (56713-B1-PUB)," this CPUID bit
> indicates that a WRMSR to MSR_FS_BASE, MSR_GS_BASE, or
> MSR_KERNEL_GS_BASE is non-serializing. This is a change in previously
> architected behavior.
> 
> [...]

Applied to kvm-x86 misc, thanks!

[1/1] x86: KVM: Add feature flag for CPUID.80000021H:EAX[bit 1]
      https://github.com/kvm-x86/linux/commit/329369caeccb

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