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x86/tsx: Set default TSX mode to auto

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At SUSE we've been releasing our kernels with TSX enabled for the past 6
years and some customers have started to rely on it. Furthermore, the last
known vulnerability concerning TSX was TAA (CVE-2019-11135) and a
significant amount time has passed since then without anyone reporting any
issues. Intel has released numerous processors which do not have the
TAA vulnerability (Cooper/Ice Lake, Sapphire/Emerald/Granite Rappids)
yet TSX remains being disabled by default.

The main aim of this patch is to reduce the divergence between SUSE's
configuration and the upstream by switching the default TSX mode to
auto. I believe this strikes the right balance between keeping it
enabled where appropriate (i.e every machine which doesn't contain the
TAA vulnerability) and disabling it preventively.

Signed-off-by: Nikolay Borisov <nik.borisov@suse.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://patch.msgid.link/20251112190548.750746-1-nik.borisov@suse.com
This commit is contained in:
Nikolay Borisov 2025-11-12 21:05:48 +02:00 committed by Dave Hansen
parent 18fe1f5862
commit f8c7600d46
1 changed files with 1 additions and 1 deletions
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2
arch/x86/Kconfig
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@ -1816,7 +1816,7 @@ config ARCH_PKEY_BITS
choice
prompt "TSX enable mode"
depends on CPU_SUP_INTEL
default X86_INTEL_TSX_MODE_OFF
default X86_INTEL_TSX_MODE_AUTO
help
Intel's TSX (Transactional Synchronization Extensions) feature
allows to optimize locking protocols through lock elision which