linux-kernel - Re: [PATCH v1 2/3] x86/msr: Switch between WRMSRNS and WRMSR with the alternatives mechanism

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Message-ID: <20240818055904.GBZsGNqJA2Cdl2P0mt@fat_crate.local>
Date: Sun, 18 Aug 2024 07:59:04 +0200
From: Borislav Petkov <bp@...en8.de>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Xin Li <xin@...or.com>, Andrew Cooper <andrew.cooper3@...rix.com>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	dave.hansen@...ux.intel.com, x86@...nel.org, peterz@...radead.org,
	seanjc@...gle.com
Subject: Re: [PATCH v1 2/3] x86/msr: Switch between WRMSRNS and WRMSR with
 the alternatives mechanism

On Sat, Aug 17, 2024 at 12:22:56PM -0700, H. Peter Anvin wrote:
> Only if the call goes to a C function.

Aha, you have a patch in the thread which calls a by-hand asm thing.

I haven't looked in detail but we have a THUNK macro for such stuff.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette