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Peter Anvin" CC: Alexander Graf , Boris Ostrovsky , Subject: [RFC PATCH 29/56] x86/apic: Add self-NMI support Date: Mon, 13 Oct 2025 09:34:17 -0500 Message-ID: <20251013143444.3999-30-david.kaplan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251013143444.3999-1-david.kaplan@amd.com> References: <20251013143444.3999-1-david.kaplan@amd.com> 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-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000989E7:EE_|LV8PR12MB9335:EE_ X-MS-Office365-Filtering-Correlation-Id: 785c7d43-3dc4-4889-91b3-08de0a65d07a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|36860700013|82310400026|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?S+DzPApEXeDRtVqgWniCMhJZ1vjLT7ev2c3JoFm5Mm1u+F35gV1aapfMywXz?= =?us-ascii?Q?IlX33scHYAJqCDKXDrgg1ZqdlLRnRs5q5Ropnrbt8tVu5+gROF78YUYJ+KIr?= =?us-ascii?Q?p6bCQfAnGdIk4VffEyzcZ8Y4Y+DwplrK3EOvB2S2t4dRAMPKodVBPfXI3Rxv?= =?us-ascii?Q?HasWYROw+yFnCoEcDml6v7TyWpzjIq8AyHVuz6/4nclVO0pxcWrdrvZvrI1n?= =?us-ascii?Q?780o5mxgQmyx4Fh2LUWTDwCABI+GQcRFtejdkl8fd/GEA7fTkA+VVKqHJT6o?= =?us-ascii?Q?d1en8xgJJxT7y8TysEiqYJOPCB30wFHmJ3QKs+Hoo6p8+axTtPM3pyvpUgaL?= =?us-ascii?Q?T/dwF2MH9INBK9or7B5B2k1Q9RCgSVjOeYT7M4duZ0rJAmD2qTAKrQA0jGab?= =?us-ascii?Q?G3pdaD06TU7uGZlvya3yHJEMZbzfN+00/2jolIJ2urr/7F7MqJUyEyXku4f0?= =?us-ascii?Q?6C2GaaGaT8e8AjEZ4YFBBTe/r7l/l3i7x/E9On4KlxSVez5HdJa5/IpHhHns?= =?us-ascii?Q?BDBqxpQMic2bRJieUSAnsrhn6h6o7NvSUJSqr73MzJo3QO+O7mh43GnhzqWy?= =?us-ascii?Q?j9kFaiqsQExdyu8268nweU3dAWnIOuF83JncxHUUAx/Pqfa6jbchTBRsDU+F?= =?us-ascii?Q?fOCDj8cVfG2a+yMIsJv6m6SV3fZcArX2/SXjWCIZ5mmU2kyOCOjJ192wtwIv?= =?us-ascii?Q?92hyxVpnh0VwfB7P5Ngg1MsnbAb4FIcYaeVri+cmWQkhd11E9N1fGG6AQnnj?= =?us-ascii?Q?zbtABIVU8TgJ2HKanyqFUYOZWbVEOKvbcuV/LzAS6n3hQwkkuzVFxqD5It9T?= =?us-ascii?Q?yvZucFvnrrx97DxU24vhb3Nxa/tCyFYAEVP61QconP0ThOfHdTq9s+P1i0sJ?= =?us-ascii?Q?T1SnFBl8B/iGU2iv8RTiyxBZr3T608Am+3TRvKp2NjpFBkEAdptSzz5bf915?= =?us-ascii?Q?f3lthwEnk98vd0UdJdonF3GzgY+iHaTB53bgvM/TFV128SFxaXCa89cYOkFl?= =?us-ascii?Q?Xfdnxx4a0J5dGohi9eqZ6hlT0kLaPbenH96umx+hLWXfLgpXx+Q9X3seunMo?= =?us-ascii?Q?ub13H9QraCURTgytvQiKwFWUJulXGlVoHV4RXno45iYIB7aWselKWaIT9SPO?= =?us-ascii?Q?HzOvyV6A/o4cogQMwGM8SXvibt6v7xUDw1/0/9B+j0/tUlm/cbljq+9RIVBU?= =?us-ascii?Q?g8JyW/55Zo2lka52NXf0gLyhv14Somf+f1uFQHPl24ZotPASVgftUzhMMjIs?= =?us-ascii?Q?cgh+Ho8Py96MDNukO5wn89YNA2Vw9ATbcb2txw6ZPMz2MPRta4wHOnZz/LEw?= =?us-ascii?Q?nTPKitIKYmvgbcKbngsfhuBomYLTJxISALYbrE/R/WdIJ83p8z6ON3Cfd17Z?= =?us-ascii?Q?jCYM5f9lzTLCQ2UkwzmQU4iqc9MpcJwlVddehh1/0FM8Fu80jhj1M1PpjUud?= =?us-ascii?Q?85HkiQdkBORV3dm3jycRYnpBKf+82DcnX4jAb04XBUCgQ7C3e9VVpZVlWanD?= =?us-ascii?Q?SPzJePQ9IAhRZey/0jl39nnjC93SIHKDPRlBcMgWnkzE+6R0dxpsRvnJvVjb?= =?us-ascii?Q?eAJm6uQn6J+nFqyBRRU=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(7416014)(1800799024)(36860700013)(82310400026)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Oct 2025 14:35:53.7456 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 785c7d43-3dc4-4889-91b3-08de0a65d07a X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000989E7.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9335 Content-Type: text/plain; charset="utf-8" Add function to send an NMI-to-self which is needed for stop_machine_nmi(). Note that send_IPI_self() cannot be used to send an NMI so send_IPI() is used. Signed-off-by: David Kaplan --- arch/x86/kernel/apic/ipi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kernel/apic/ipi.c b/arch/x86/kernel/apic/ipi.c index 98a57cb4aa86..6d4e5aa27529 100644 --- a/arch/x86/kernel/apic/ipi.c +++ b/arch/x86/kernel/apic/ipi.c @@ -4,6 +4,7 @@ #include #include #include +#include =20 #include =20 @@ -248,6 +249,12 @@ void default_send_IPI_self(int vector) __default_send_IPI_shortcut(APIC_DEST_SELF, vector); } =20 +/* Self-NMI is used in stop_machine_nmi() */ +void arch_send_self_nmi(void) +{ + apic->send_IPI(smp_processor_id(), NMI_VECTOR); +} + #ifdef CONFIG_X86_32 void default_send_IPI_mask_sequence_logical(const struct cpumask *mask, in= t vector) { --=20 2.34.1