linux-kernel - Re: [PATCH v4 00/19] Enable FRED with KVM VMX

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Message-ID: <D379AE34-58DE-4082-B0DF-1D1AE463D19A@zytor.com>
Date: Tue, 24 Jun 2025 10:47:17 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Xin Li <xin@...or.com>, Sean Christopherson <seanjc@...gle.com>
CC: pbonzini@...hat.com, kvm@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, corbet@....net, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, andrew.cooper3@...rix.com, luto@...nel.org,
        peterz@...radead.org, chao.gao@...el.com, xin3.li@...el.com
Subject: Re: [PATCH v4 00/19] Enable FRED with KVM VMX

On June 24, 2025 10:43:26 AM PDT, Xin Li <xin@...or.com> wrote:
>On 6/24/2025 10:06 AM, Sean Christopherson wrote:
>> On Fri, Mar 28, 2025, Xin Li wrote:
>>> Any chance we could merge FRED ahead of CET?
>> 
>> Probably not?  CET exists is publicly available CPUs.  AFAIK, FRED does not.
>
>Better not, as you said it creates extra effort because FRED does lean a
>bit on CET.
>
>I was a bit worried that CET would take longer time than expected...
>
>> And CET is (/knock wood) hopefully pretty much ready?  FWIW, I'd really like to
>
>That is also my reading on CET.
>
>> get both CET and FRED virtualization landed by 6.18, i.e. in time for the next
>> LTS.
>
>I love the plan!
>
>FRED is my top priority.  I’ll address all your comments, rebase onto
>kvm-x86/next (you have not updated yet :) ), and send out v5 at an
>appropriate time.
>
>Thanks!
>     Xin
>

FRED doesn't lean on CET... one could argue it leans on LASS, at least to a small extent, though.