From: Sean Christopherson <seanjc@google.com>
To: Jonathan Corbet <corbet@lwn.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, Peter Zijlstra <peterz@infradead.org>,
Josh Poimboeuf <jpoimboe@kernel.org>
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
Sean Christopherson <seanjc@google.com>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Daniel Sneddon <daniel.sneddon@linux.intel.com>
Subject: [PATCH 0/3] x86/cpu: Fix SPECULATIVE_MITIGATION=n kernels
Date: Tue, 9 Apr 2024 10:51:04 -0700 [thread overview]
Message-ID: <20240409175108.1512861-1-seanjc@google.com> (raw)
Fix the handling of SPECULATION_MITIGATIONS=n so that it actually does
what it says it does: disable any and all mitigations.
And because I don't see a way to provide sane behavior for overriding
SPECULATION_MITIGATIONS=n at runtime, explicitly disallow doing so via
the "mitigations" kernel parameter, e.g. so that the user at least knows
that their system is still likely vulnerable to a variety of issues.
Sean Christopherson (3):
x86/cpu: Actually turn off mitigations by default for
SPECULATION_MITIGATIONS=n
x86/cpu: Disable BHI mitigation by default when
SPECULATION_MITIGATIONS=n
x86/cpu: Ignore "mitigations" kernel parameter if
SPECULATION_MITIGATIONS=n
Documentation/admin-guide/kernel-parameters.txt | 3 +++
arch/x86/Kconfig | 10 +++++++---
arch/x86/kernel/cpu/bugs.c | 6 +++---
kernel/cpu.c | 5 ++++-
4 files changed, 17 insertions(+), 7 deletions(-)
base-commit: 2c71fdf02a95b3dd425b42f28fd47fb2b1d22702
--
2.44.0.478.gd926399ef9-goog
next reply other threads:[~2024-04-09 17:51 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-09 17:51 Sean Christopherson [this message]
2024-04-09 17:51 ` [PATCH 1/3] x86/cpu: Actually turn off mitigations by default for SPECULATION_MITIGATIONS=n Sean Christopherson
2024-04-13 1:53 ` Stephen Rothwell
2024-04-13 9:27 ` Michael Ellerman
2024-04-13 9:38 ` Michael Ellerman
2024-04-14 22:42 ` Stephen Rothwell
2024-04-15 11:16 ` Geert Uytterhoeven
2024-04-15 14:31 ` Sean Christopherson
2024-04-16 11:06 ` Michael Ellerman
2024-04-19 14:03 ` Will Deacon
2024-04-19 14:06 ` Sean Christopherson
2024-04-19 14:38 ` Will Deacon
2024-04-15 11:13 ` Geert Uytterhoeven
2024-04-09 17:51 ` [PATCH 2/3] x86/cpu: Disable BHI mitigation by default when SPECULATION_MITIGATIONS=n Sean Christopherson
2024-04-09 17:51 ` [PATCH 3/3] x86/cpu: Ignore "mitigations" kernel parameter if SPECULATION_MITIGATIONS=n Sean Christopherson
2024-04-10 14:18 ` Ingo Molnar
2024-04-09 18:55 ` [PATCH 0/3] x86/cpu: Fix SPECULATIVE_MITIGATION=n kernels Daniel Sneddon
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