linux-kernel - Re: [PATCH v4 10/11] x86/bugs: Remove GDS Force Kconfig option

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Message-ID: <1d258c8a-b513-47e7-a94d-60263af8f190@linux.intel.com>
Date: Mon, 29 Jul 2024 10:09:13 -0700
From: Daniel Sneddon <daniel.sneddon@...ux.intel.com>
To: Breno Leitao <leitao@...ian.org>, bp@...en8.de,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>,
 Josh Poimboeuf <jpoimboe@...nel.org>,
 Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 10/11] x86/bugs: Remove GDS Force Kconfig option

On 7/29/24 09:40, Breno Leitao wrote:
> Remove the MITIGATION_GDS_FORCE Kconfig option, which aggressively disables
> AVX as a mitigation for Gather Data Sampling (GDS) vulnerabilities. This
> option is not widely used by distros.
> 
> While removing the Kconfig option, retain the runtime configuration
> ability through the `gather_data_sampling=force` kernel parameter. This
> allows users to still enable this aggressive mitigation if needed,
> without baking it into the kernel configuration.
> 
> This change simplifies the kernel configuration while maintaining
> flexibility for runtime mitigation choices.
> 
> Cc: Daniel Sneddon <daniel.sneddon@...ux.intel.com>
> Suggested-by: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Breno Leitao <leitao@...ian.org>

LGTM. Feel free to add a Reviewed-by from me.