linux-kernel - Re: [PATCH] cpu/bugs: Disable CPU mitigations at compilation time

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Message-ID: <ZIiTKttkucqiE8wJ@gmail.com>
Date:   Tue, 13 Jun 2023 09:02:50 -0700
From:   Breno Leitao <leitao@...ian.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     pawan.kumar.gupta@...ux.intel.com,
        Thomas Gleixner <tglx@...utronix.de>, paul@...l-moore.com,
        leit@...a.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpu/bugs: Disable CPU mitigations at compilation time

On Mon, Jun 12, 2023 at 07:05:32PM +0200, Borislav Petkov wrote:
> On Mon, Jun 12, 2023 at 09:37:07AM -0700, Breno Leitao wrote:
> > I am not sure if these bugs (MDS, TAA) are speculations related. Pawan
> > could help us here.
> 
> "Microarchitectural Data Sampling is a hardware vulnerability which allows
> unprivileged speculative access..."
> 
> "TAA is a hardware vulnerability that allows unprivileged speculative
> access to data which is available in various CPU..."

 Is it OK if I send a patch that would disable these mitigations if
CONFIG_SPECULATION_MITIGATIONS is set to "no"?

Thank you!