linux-kernel - Re: [PATCH v6 1/6] x86/bugs: Add asm helpers for executing VERW

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Date: Thu, 1 Feb 2024 19:29:09 -0800
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>, Jonathan Corbet <corbet@....net>,
	Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>, tony.luck@...el.com,
	ak@...ux.intel.com, tim.c.chen@...ux.intel.com,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	kvm@...r.kernel.org,
	Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
	Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
	antonio.gomez.iglesias@...ux.intel.com,
	Alyssa Milburn <alyssa.milburn@...el.com>
Subject: Re: [PATCH  v6 1/6] x86/bugs: Add asm helpers for executing VERW

On Tue, Jan 23, 2024 at 11:41:01PM -0800, Pawan Gupta wrote:
> index 4af140cf5719..79a7e81b9458 100644
> --- a/arch/x86/include/asm/cpufeatures.h
> +++ b/arch/x86/include/asm/cpufeatures.h
> @@ -308,10 +308,10 @@
>  #define X86_FEATURE_SMBA		(11*32+21) /* "" Slow Memory Bandwidth Allocation */
>  #define X86_FEATURE_BMEC		(11*32+22) /* "" Bandwidth Monitoring Event Configuration */
>  #define X86_FEATURE_USER_SHSTK		(11*32+23) /* Shadow stack support for user mode applications */
> -
>  #define X86_FEATURE_SRSO		(11*32+24) /* "" AMD BTB untrain RETs */
>  #define X86_FEATURE_SRSO_ALIAS		(11*32+25) /* "" AMD BTB untrain RETs through aliasing */
>  #define X86_FEATURE_IBPB_ON_VMEXIT	(11*32+26) /* "" Issue an IBPB only on VMEXIT */
> +#define X86_FEATURE_CLEAR_CPU_BUF	(11*32+27) /* "" Clear CPU buffers using VERW */

This will need to be rebased.  And the "11*32" level is now full in
Linus' tree, so this will presumably need to go to a different "level".

-- 
Josh