linux-kernel - Re: [PATCH v6 1/2] x86, lib: Add WBNOINVD helper functions

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Message-ID: <20250226142222.GGZ78jnpbBc45Nl9uU@fat_crate.local>
Date: Wed, 26 Feb 2025 15:22:22 +0100
From: Borislav Petkov <bp@...en8.de>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Kevin Loughlin <kevinloughlin@...gle.com>, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
	x86@...nel.org, hpa@...or.com, pbonzini@...hat.com,
	kirill.shutemov@...ux.intel.com, kai.huang@...el.com,
	ubizjak@...il.com, jgross@...e.com, kvm@...r.kernel.org,
	thomas.lendacky@....com, pgonda@...gle.com, sidtelang@...gle.com,
	mizhang@...gle.com, rientjes@...gle.com, manalinandan@...gle.com,
	szy0127@...u.edu.cn
Subject: Re: [PATCH v6 1/2] x86, lib: Add WBNOINVD helper functions

On Tue, Feb 25, 2025 at 05:26:53PM -0800, Sean Christopherson wrote:
> /* Instruction encoding provided for binutils backwards compatibility. */
> #define ASM_WBNOINVD ".byte 0xf3,0x0f,0x09"

Yah, or simply INSN_WBNOINVD as that name basically tells you what it is. And
we have already

arch/x86/include/asm/bug.h:13:#define INSN_UD2  0x0b0f

oh and

arch/x86/include/asm/bug.h:12:#define ASM_UD2           ".byte 0x0f, 0x0b"

Pff.

-- 
Regards/Gruss,
    Boris.

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