linux-kernel - Re: [PATCH 1/3] x86/cpufeatures: Add support for cpuid leaf 80000021/EAX (FeatureExt2Eax)

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Message-ID: <Y2WIy2A1RuQE/9SK@zn.tnic>
Date:   Fri, 4 Nov 2022 22:48:59 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Kim Phillips <kim.phillips@....com>
Cc:     x86@...nel.org, Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Jonathan Corbet <corbet@....net>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tony Luck <tony.luck@...el.com>,
        Babu Moger <Babu.Moger@....com>,
        Tom Lendacky <thomas.lendacky@....com>, kvm@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] x86/cpufeatures: Add support for cpuid leaf
 80000021/EAX (FeatureExt2Eax)

On Fri, Nov 04, 2022 at 04:36:49PM -0500, Kim Phillips wrote:
> AMD Zen4 processors advertise features in this leaf.
> Add the leaf and its Automatic IBRS feature bit.
> 
> Note: New whole leaf (vs a bit) due to propagation via KVM
> later in this series.

No, not a separate leaf - use scattered.c

For an example what to do for KVM, see

https://lore.kernel.org/r/20221103025030.78371-1-jiaxi.chen@linux.intel.com

Thx.

-- 
Regards/Gruss,
    Boris.

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