Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Tue, 13 Jun 2023 09:02:50 -0700
From:   Breno Leitao <leitao@debian.org>
To:     Borislav Petkov <bp@alien8.de>
Cc:     pawan.kumar.gupta@linux.intel.com,
        Thomas Gleixner <tglx@linutronix.de>, paul@paul-moore.com,
        leit@meta.com, x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cpu/bugs: Disable CPU mitigations at compilation time
Message-ID: <ZIiTKttkucqiE8wJ@gmail.com>
References: <20230203120615.1121272-1-leitao@debian.org>
 <87352z7xld.ffs@tglx>
 <ZIcVoIAQbRl1GTo5@gmail.com>
 <20230612133230.GJZIcebkHxd8QJs0Dv@fat_crate.local>
 <ZIchqLWousxkCqyB@gmail.com>
 <20230612135301.GKZIcjPY0xvbNsiVNd@fat_crate.local>
 <ZIcoss0r/898/CpH@gmail.com>
 <20230612160807.GNZIdC58KQ8IibZjrt@fat_crate.local>
 <ZIdJs0F8Ow4sV27r@gmail.com>
 <20230612170532.GOZIdQXLYZCGKZQFXv@fat_crate.local>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230612170532.GOZIdQXLYZCGKZQFXv@fat_crate.local>
Precedence: bulk

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!