linux-kernel - Re: [PATCH v2 01/12] kexec: Allow architecture code to opt-out at runtime

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Message-ID: <YYFpOfovSN2Af+ux@suse.de>
Date:   Tue, 2 Nov 2021 17:37:13 +0100
From:   Joerg Roedel <jroedel@...e.de>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Borislav Petkov <bp@...en8.de>, Joerg Roedel <joro@...tes.org>,
        x86@...nel.org, kexec@...ts.infradead.org, stable@...r.kernel.org,
        hpa@...or.com, Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Martin Radev <martin.b.radev@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 01/12] kexec: Allow architecture code to opt-out at
 runtime

On Mon, Nov 01, 2021 at 04:11:42PM -0500, Eric W. Biederman wrote:
> I seem to remember the consensus when this was reviewed that it was
> unnecessary and there is already support for doing something like
> this at a more fine grained level so we don't need a new kexec hook.

It was a discussion, no consenus :)

I still think it is better to solve this in generic code for everybody
to re-use than with an hack in the architecture hooks.

More and more platforms which enable confidential computing features
may need this hook in the future.

Regards,

-- 
Jörg Rödel
jroedel@...e.de

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