linux-kernel - Re: [PATCH v6 3/3] x86/bugs: Add 'spectre

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Message-ID: <20240628094057.GGZn6FKXHtB_AsrzHl@fat_crate.local>
Date: Fri, 28 Jun 2024 11:40:57 +0200
From: Borislav Petkov <bp@...en8.de>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexandre Chartre <alexandre.chartre@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	KP Singh <kpsingh@...nel.org>, Waiman Long <longman@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Maksim Davydov <davydov-max@...dex-team.ru>
Subject: Re: [PATCH v6 3/3] x86/bugs: Add 'spectre_bhi=vmexit' cmdline option

On Tue, Jun 25, 2024 at 11:02:02PM -0700, Josh Poimboeuf wrote:
> -	/* Mitigate KVM by default */
> -	setup_force_cpu_cap(X86_FEATURE_CLEAR_BHB_LOOP_ON_VMEXIT);
> -	pr_info("Spectre BHI mitigation: SW BHB clearing on vm exit\n");
> +	if (bhi_mitigation == BHI_MITIGATION_VMEXIT_ONLY) {
> +		pr_info("Spectre BHI mitigation: SW BHB clearing on vm exit only\n");

"... VM exit... "

I'll touch up when applying.

-- 
Regards/Gruss,
    Boris.

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