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Bae" To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, peterz@infradead.org, david.kaplan@amd.com, chang.seok.bae@intel.com Subject: [PATCH v4 4/9] x86/apic: Implement self-NMI support Date: Wed, 4 Nov 2026 18:23:17 +0000 Message-ID: <20261104182322.578066-5-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261104182322.578066-1-chang.seok.bae@intel.com> References: <20261104182322.578066-1-chang.seok.bae@intel.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: David Kaplan Add a function to send an NMI-to-self which is needed for stop-machine NMI facility. Note that __apic_send_IPI_self() cannot be used to send an NMI so __apic_send_IPI() is used. Signed-off-by: David Kaplan Signed-off-by: Chang S. Bae --- arch/x86/kernel/apic/ipi.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/x86/kernel/apic/ipi.c b/arch/x86/kernel/apic/ipi.c index c627bee3b14f..2bb70db5ee27 100644 --- a/arch/x86/kernel/apic/ipi.c +++ b/arch/x86/kernel/apic/ipi.c @@ -4,6 +4,7 @@ #include #include #include +#include #include @@ -248,6 +249,15 @@ void default_send_IPI_self(int vector) __default_send_IPI_shortcut(APIC_DEST_SELF, vector); } +#ifdef CONFIG_STOP_MACHINE_NMI + +void arch_send_self_nmi(void) +{ + __apic_send_IPI(smp_processor_id(), NMI_VECTOR); +} + +#endif + #ifdef CONFIG_X86_32 void default_send_IPI_mask_sequence_logical(const struct cpumask *mask, int vector) { -- 2.53.0