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

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Message-ID: <20250410074828.GU9833@noisy.programming.kicks-ass.net>
Date: Thu, 10 Apr 2025 09:48:28 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "H. Peter Anvin" <hpa@...or.com>
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 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.