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Wed, 20 Aug 2025 13:21:17 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 3s+6BM3LpWj+RwAAD6G6ig (envelope-from ); Wed, 20 Aug 2025 13:21:17 +0000 From: Nikolay Borisov To: x86@kernel.org Cc: dave.hansen@linux.intel.comd, linux-kernel@vger.kernel.org, mhocko@suse.de, Nikolay Borisov Subject: [PATCH] x86/tsx: Set default TSX mode to auto Date: Wed, 20 Aug 2025 16:21:04 +0300 Message-Id: <20250820132104.8633-1-nik.borisov@suse.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Queue-Id: 95FFB203F3 X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:dkim,suse.com:mid,suse.com:email]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_FIVE(0.00)[5]; DKIM_TRACE(0.00)[suse.com:+] X-Spam-Score: -3.01 Content-Type: text/plain; charset="utf-8" The last known vulnerability concerning TSX was TAA (CVE-2019-11135) a lot of time has passed since then and Intel has released a numerous processor which do not have the TAA vulnerability (Cooper/Ice Lake, Sapphire/Emerald/Granite Rappids) yet have TSX disable by default. I believe having the default to AUTO rather than OFF strikes a good balance between mitigation and reaping the benefits of the TSX feature. So let's switch the default to AUTO. Signed-off-by: Nikolay Borisov --- arch/x86/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 58d890fe2100..d1c4a8840d7c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1810,7 +1810,7 @@ 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 --=20 2.34.1