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

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Message-ID: <20231027153327.GKZTvYR3qslaTUjtCT@fat_crate.local>
Date:   Fri, 27 Oct 2023 17:33:27 +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] x86/barrier: Do not serialize MSR accesses on AMD

On Tue, Jul 04, 2023 at 11:22:22AM +0200, Borislav Petkov wrote:
> I'm wondering if we could make:
> 
> 	alternative("mfence; lfence;", "", X86_VENDOR_AMD);
> 
> work...

Seems to work in my guest here and it don't look half as bad. See
replies to this message.

-- 
Regards/Gruss,
    Boris.

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