linux-kernel - Re: [PATCH 2/2] x86/barrier: Do not serialize MSR accesses on AMD

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Message-ID: <20231027192907.GSZTwPg8v7NF6+Zn0w@fat_crate.local>
Date:   Fri, 27 Oct 2023 21:29:07 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     X86 ML <x86@...nel.org>,
        Kishon VijayAbraham <Kishon.VijayAbraham@....com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86/barrier: Do not serialize MSR accesses on AMD

On Fri, Oct 27, 2023 at 09:16:33PM +0200, Borislav Petkov wrote:
> Thus the more conservative approach here.

And on a second thought, I don't need any of that new stuff - I simply
need a synthetic flag which says "MSRs need fencing" and set it on
everything but AMD and Hygon. And we've solved this type of issue
gazillion times already - why am I reinventing the wheel?!

:-\

-- 
Regards/Gruss,
    Boris.

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