linux-kernel - Re: [RFC PATCH 1/1] KVM: SEV: Add support for SMT Protection

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Message-ID: <7c36a16a-1c04-4c05-8689-52d8b75d3965@intel.com>
Date: Thu, 7 Aug 2025 11:00:19 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Kim Phillips <kim.phillips@....com>, linux-kernel@...r.kernel.org,
 kvm@...r.kernel.org, linux-coco@...ts.linux.dev, x86@...nel.org
Cc: Peter Zijlstra <peterz@...radead.org>, Juri Lelli
 <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini
 <pbonzini@...hat.com>, Ingo Molnar <mingo@...hat.com>,
 "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>,
 K Prateek Nayak <kprateek.nayak@....com>,
 "Nikunj A . Dadhania" <nikunj@....com>,
 Tom Lendacky <thomas.lendacky@....com>, Michael Roth <michael.roth@....com>,
 Ashish Kalra <ashish.kalra@....com>,
 Borislav Petkov <borislav.petkov@....com>, Borislav Petkov <bp@...en8.de>,
 Nathan Fontenot <nathan.fontenot@....com>,
 Dhaval Giani <Dhaval.Giani@....com>, Santosh Shukla
 <santosh.shukla@....com>, Naveen Rao <naveen.rao@....com>,
 "Gautham R . Shenoy" <gautham.shenoy@....com>,
 Ananth Narayan <ananth.narayan@....com>, Pankaj Gupta
 <pankaj.gupta@....com>, David Kaplan <david.kaplan@....com>,
 Jon Grimm <Jon.Grimm@....com>
Subject: Re: [RFC PATCH 1/1] KVM: SEV: Add support for SMT Protection

On 8/7/25 09:59, Kim Phillips wrote:
> Add the new CPUID bit that indicates available hardware support:
> CPUID_Fn8000001F_EAX [AMD Secure Encryption EAX] bit 25.
> 
> Indicate support for SEV_FEATURES bit 15 (SmtProtection) to be set by
> an SNP guest to enable the feature.

It would be ideal to see an logical description of what "SmtProtection"
is and what it means for the kernel as opposed to referring to the
documentation and letting reviewers draw their own conclusions.