linux-kernel - Re: [PATCH 06/20] x86/msr: Standardize on 'u32' MSR indices in <asm/msr.h>

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Message-ID: <027114D4-AA7D-43E5-A8A0-E57121177517@zytor.com>
Date: Thu, 10 Apr 2025 01:53:38 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Peter Zijlstra <peterz@...radead.org>
CC: Xin Li <xin@...or.com>, Ingo Molnar <mingo@...nel.org>,
        linux-kernel@...r.kernel.org, Juergen Gross <jgross@...e.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Borislav Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 06/20] x86/msr: Standardize on 'u32' MSR indices in <asm/msr.h>

On April 10, 2025 12:48:28 AM PDT, Peter Zijlstra <peterz@...radead.org> wrote:
>On Wed, Apr 09, 2025 at 11:14:12PM -0700, H. Peter Anvin wrote:
>
>> No, and as you know, I'd like to get rid of the native_ and xen_ functions
>> entirely anyway.
>
>I have vague memories of locations where we *have* to use native_{rd,wr}msr()
>because the paravirt indirections cause problems.
>
>I don't clearly recall the reasons, but it could be instrumentation
>related. The paravirt muck has tracepoints and other crap included.
>

Yes, that's part of what we want to get rid of.