linux-kernel - Re: [RFC][PATCH 06/17] x86/cpu: Add SRSO untrain to retbleed=

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Message-ID: <20230810154404.GOZNUFxHxLIMth6j9s@fat_crate.local>
Date:   Thu, 10 Aug 2023 17:44:04 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, David.Kaplan@....com,
        Andrew.Cooper3@...rix.com, jpoimboe@...nel.org,
        gregkh@...uxfoundation.org
Subject: Re: [RFC][PATCH 06/17] x86/cpu: Add SRSO untrain to retbleed=

On Wed, Aug 09, 2023 at 09:12:24AM +0200, Peter Zijlstra wrote:
> Since it is now readily apparent that the two SRSO
> untrain_ret+return_thunk variants are exactly the same mechanism as
> the existing (retbleed) zen untrain_ret+return_thunk, add them to the
> existing retbleed options.

Except that Zen3/4 are not affected by retbleed, according to my current
state of information.

I don't like this lumping together of the issues even if their
mitigations are more or less similar.

-- 
Regards/Gruss,
    Boris.

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