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Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Arnaldo Carvalho de Melo , Josh Poimboeuf , Paolo Bonzini , Arnd Bergmann , Frederic Weisbecker , "Paul E. McKenney" , Jason Baron , Steven Rostedt , Ard Biesheuvel , Sami Tolvanen , "David S. Miller" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Mel Gorman , Andrew Morton , Masahiro Yamada , Han Shen , Rik van Riel , Jann Horn , Dan Carpenter , Oleg Nesterov , Juri Lelli , Clark Williams , Yair Podemsky , Marcelo Tosatti , Daniel Wagner , Petr Tesarik , Shrikanth Hegde Subject: [PATCH v7 17/31] x86/bugs: Mark cpu_buf_vm_clear key as allowed in .noinstr Date: Fri, 14 Nov 2025 16:01:19 +0100 Message-ID: <20251114150133.1056710-18-vschneid@redhat.com> In-Reply-To: <20251114150133.1056710-1-vschneid@redhat.com> References: <20251114150133.1056710-1-vschneid@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: E68EA18000B X-Stat-Signature: yeggkmt1rmwghibrfyd7eobfbp63ouft X-HE-Tag: 1763132795-821047 X-HE-Meta: U2FsdGVkX1/XreyH0cJVU5YV0j3MARZUHa7RImKQ9FLRtzSE/Xes5ne54/enknBj+ShpMvojXyiEmz2feCFmxHNmaDOgPcUuZYv4uSJvzGliM/X+gjf4FmjfsNddkYY1RqBh2FQ9zgw36EGA1+xAIX3FIqdzJswUgISIpm5MsQmoxIV9lGiNaWJhmKBnhyMTr8PdMJ0+rbvNOREWmMqaBnsSTxWY9cXJP67vChgO9ep/ZRy+VYieP1RMNPXctcYdqVXeyCCg6phHSP0iV729C4gKDlxbRJ5+Gm44vALFUPn5HJoMoa4s/8hBLG9jMLDPjRdwUaEq7ORGeoKdPEpTeBh6BSHSwJEBNBfv27kbFPd4n2BnXEmwnFElX9sjMonZbeFdzEOtY3O6ybploKKiXHoLeJkn/jRX3YiAwe8uPy25zLPZUiuU0QYRjrF7WTb5iL5IBUjftxrzgtY+oDF1dwzUqDnY6QE2i7Lx75xwdiqHEmF2qHHKXQ4Sm5dcFv7yTCQeUeNriTPUnLAvM6vGkA05FGTKFUkKKVMwGH4JgjHHlIDcTpeuFmMPRc/2Jrl/grskiwrAwREDaNPYA+DWF1RhCKjMpAv0xaezOYkbqAAO0aqB2tMsrBEDfjslBgqi6PPhs2m47tQM+oJ0avnzPnsTsz5NXLQcDVZ55N+hUfkeh4Iuv4WlcVcxHN81Z5k2D5kMGHD0kHKgFAyd4tfziu1Vvwr9Pyy4viA95syjjZPtXn6LpwrBBLppRze2GAIJgJ9a4DBNochjfbe4RndVozSs5mdt0E8qlnbWXDUMy316cLclkQicJjLkUYO+o/eybJRB/YXaDKeW0fiC1rpaBJtKRNiqUaRMhXEXndppWz4c8LYtFuGSsBlHryqkjJ1dhDDiC0CuCh6b/h76270JDopXikaqwX/befo85ccaCw6WLJyWzbk8z1r7kL8IsUdXYFBMjf6/kl05m2NjJE8 EacV0oWG JaXRMarpe2VlD7DQqPj5F/CZJZ5+JiY3Kt1D4ZuOhoIXlcdgOPIykhLL8MHYFBtYEpbYRMJacF2P6amEKi0q9d+FRQSFUNQlTQRiwfndRq5GN3mEdv4xa39Y7J2QtkMMCvB4+7EEo1pI5Hp1BKYIFCIbtyxujrc7dQChE6sbtNLVd2agxQIt9B0g3CjsWhc/wYSDYVc5fj7Ua2DKIpRUWQCo5LGjO3ohmWZUK/YKlf4SzXuo1dh7cyLU8oxUTu1gOlioyty0VVf6LTlKVclDvaS7QKuR/oDMy8lWtjXbOm5BGwxy9UK/FP9KNfOHL7EYotrwbF3yeS/bzcD3M2r+Uldkhd9EjAJqTe5C1x0lVLndnan4wsxBTxHIrlMU0F3MOA75z3j4wpPOX9W+WnOK/HP5wK3wvzGTJt+yBBCVBLkfreF9ECtokX5Fv3bvGIP5AhwG57YjxAYms8S5iIBU6O8GJKAA6cESBwn+b X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The static key is only ever updated in __init mmio_apply_mitigation Mark it to let objtool know not to warn about it. Signed-off-by: Valentin Schneider --- arch/x86/kernel/cpu/bugs.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index d7fa03bf51b45..a2d7dc4d2a4a3 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -196,8 +196,11 @@ DEFINE_STATIC_KEY_FALSE(switch_mm_cond_l1d_flush); * Controls CPU Fill buffer clear before VMenter. This is a subset of * X86_FEATURE_CLEAR_CPU_BUF, and should only be enabled when KVM-only * mitigation is required. + * + * NOINSTR: This static key is only updated during init, so it can't be + * a cause of post-init interference. */ -DEFINE_STATIC_KEY_FALSE(cpu_buf_vm_clear); +DEFINE_STATIC_KEY_FALSE_NOINSTR(cpu_buf_vm_clear); EXPORT_SYMBOL_GPL(cpu_buf_vm_clear); #undef pr_fmt -- 2.51.0