linux-kernel - [PATCH 0/2] x86/bugs: Break down mitigations configurations

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Message-Id: <20230615164417.3588162-5-leitao@debian.org>
Date:   Thu, 15 Jun 2023 09:44:15 -0700
From:   Breno Leitao <leitao@...ian.org>
To:     pawan.kumar.gupta@...ux.intel.com, jpoimboe@...nel.org,
        peterz@...radead.org, tglx@...utronix.de, bp@...en8.de
Cc:     leit@...com, hpa@...or.com, x86@...nel.org, mingo@...hat.com,
        dave.hansen@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] x86/bugs: Break down mitigations configurations

There is no way to compile a kernel today with some of the speculative
mitigations disabled. Even if the kernel has
CONFIG_SPECULATION_MITIGATIONS=n, some Intel mitigations, such as MDS, TAA,
MMIO are still enabled and can only be disabled using a kernel parameter.

This patchset creates a way to choose what to enable or disable, and,
get the mitigations disable if CONFIG_SPECULATION_MITIGATIONS is not
set, as the rest of other mitigations.

Also, we want to print a warning message letting users know that these
mitigations are disabled.

Breno Leitao (2):
  x86/speculation: Disable mitigations if CONFIG says so
  x86/speculation: Print error when mitigations are disabled

 arch/x86/kernel/cpu/bugs.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

-- 
2.34.1