linux-kernel - Re: [PATCH 3/3] x86/msr: Add an MSR write callback

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Message-ID: <20200610132131.GG14118@zn.tnic>
Date:   Wed, 10 Jun 2020 15:21:31 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     X86 ML <x86@...nel.org>, Tom Lendacky <thomas.lendacky@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Eric Morton <Eric.Morton@....com>
Subject: Re: [PATCH 3/3] x86/msr: Add an MSR write callback

On Wed, Jun 10, 2020 at 02:32:26PM +0200, Peter Zijlstra wrote:
> We cache a whole bunch of MSRs in kernel. Why is this one special?

If the others need the post-write handling, they should be added there
too. I did it with this one only as a start.

> If you write using the stupid msr device, you get to keep all pieces.

Yes, the tainting-on-write is the next thing that goes ontop of this.

-- 
Regards/Gruss,
    Boris.

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