linux-kernel - Re: [PATCH v2 04/14] x86/cpufeatures: Assign dedicated feature word for AMD mem encryption

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Message-ID: <YAB6yLXb4Es+pJ8G@google.com>
Date:   Thu, 14 Jan 2021 09:09:28 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH v2 04/14] x86/cpufeatures: Assign dedicated feature word
 for AMD mem encryption

On Thu, Jan 14, 2021, Borislav Petkov wrote:
> On Wed, Jan 13, 2021 at 04:36:58PM -0800, Sean Christopherson wrote:
> > Collect the scattered SME/SEV related feature flags into a dedicated
> > word.  There are now five recognized features in CPUID.0x8000001F.EAX,
> > with at least one more on the horizon (SEV-SNP).  Using a dedicated word
> > allows KVM to use its automagic CPUID adjustment logic when reporting
> > the set of supported features to userspace.
> > 
> > No functional change intended.
> > 
> > Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> > ---
> 
> Subject should be:
> 
> x86/cpufeatures: Assign dedicated feature word for CPUID_0x8000001F[EAX]
> 
> but other than that, LGTM.
> 
> Anything against me taking it through tip now?

Hmm, patch 05/14 depends on the existence of the new word.  That's a non-issue
if you're planning on taking this for 5.11.  If it's destined for 5.12, maybe
get an ack from Paolo on patch 05 and take both through tip?  I can drop them
from this series when I send v3.  In hindsight, I should have split these two
patches into a separate mini-series from the get-go.

Thanks!