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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by MWH0EPF000989E9.mail.protection.outlook.com (10.167.241.136) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9228.7 via Frontend Transport; Mon, 13 Oct 2025 14:36:15 +0000 Received: from tiny.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Mon, 13 Oct 2025 07:35:48 -0700 From: David Kaplan To: Thomas Gleixner , Borislav Petkov , Peter Zijlstra , Josh Poimboeuf , Pawan Gupta , Ingo Molnar , Dave Hansen , , "H . Peter Anvin" CC: Alexander Graf , Boris Ostrovsky , Subject: [RFC PATCH 41/56] static_call: Add update_all_static_calls() Date: Mon, 13 Oct 2025 09:34:29 -0500 Message-ID: <20251013143444.3999-42-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: MWH0EPF000989E9:EE_|DM4PR12MB6376:EE_ X-MS-Office365-Filtering-Correlation-Id: d87d20b8-addb-48f2-cfe6-08de0a65dda6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|7416014|376014|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?edWbtI7CsN79aB21I4SGzzYPBwPP+oKW8ffvE9KolSNdTf1GpUwgbGQ2SALB?= =?us-ascii?Q?Pkc0a+Z+hpooE2EmnGlZpYkK20cfSg9ZMH2xtNMn4XPYfUDansRKewLztigk?= =?us-ascii?Q?EuF0vFXxn2R8MPqCcnvclpB9k9cJJB8DD3AEZds9pUdoyXN9sUsLSbORt9hv?= =?us-ascii?Q?gtkXXCjocbDBHn/ijDFoRF5I7IUnrQZKlAXdYdXgYEuaNMQA8bGlCoaL4bxU?= =?us-ascii?Q?yEnZv7f2zrfBbzts3HBhmz0XcIWluk/l+7rVVJcoqED8yuq3DI5Z549V9Twv?= =?us-ascii?Q?nWKX+VBZ0pf5BtmnxQ670BtOsa0CggBlUSyfnUziYADGONiAP9DxOuv+Uw1V?= =?us-ascii?Q?2XWguKzOfFgD15J2uH6MN480fI6nggRKx9z/iUiw+N+NyvMzWedtq3FZFQdV?= =?us-ascii?Q?Z5grUSZnDbwwdn/BDKGYJxp+9NCt2ddqk+wZsKZ2sTul/bSpKLU/dU/Sy5Hv?= =?us-ascii?Q?RZxB8sv7xh2GpGD9d1SUxemQ+kNMsXrenxzI9VPmldBxbPey3GiPwJVVTz10?= =?us-ascii?Q?BJHa+9Q3Sr1KM0Q6jSRYt45DMy9gWBUWrkk+FB/iHO664rBr7Zm5KFg48Qhl?= =?us-ascii?Q?XiTFnLTlFvoFLXNxa/i4QJKTpuEK+1gwVs0T+u1zkj+4nrQD2uYp8Ya5zlNA?= =?us-ascii?Q?0TA++uWl7wM03ZvWx7z77DgTf5SLg6yNaqzMIoek1cyPBg6fDleszg1Tooxi?= =?us-ascii?Q?B6mdzab1UYktskd1rDdw5PrTcv+hUG67QrL3eeqwq7XrxTd1Jem46ZJ5CinY?= =?us-ascii?Q?GO7ET1x12WL1nu3fs65t1QTWNGVtGuaY96wqVfmUVe/dYoSmTlEodJvbmaqf?= =?us-ascii?Q?euWPrb92W4PQwZN5r6DLzHe7mGeFGlj0KJzzA09dWY/T90pCVZLKP9xdMfMD?= =?us-ascii?Q?2P0hTKd2nz66z9H5GxNmigY6x2kfwk0biwkMRDGo/ba0NZ1nv2Qf1u+gwtUZ?= =?us-ascii?Q?PDjaMxNTrPWParodsxDHuBiur8SsoACRH748Yh0o6rGejfkSiwEjKl7B5L73?= =?us-ascii?Q?C7KbrasHjlvlEipE1ej26fubv1sH1NqMJGpt749oDwjdGDgGVTt5gYNh0ne0?= =?us-ascii?Q?LATS3FZb58BDJdXbaVCL0p38LDJm58hJXWA4tBiBKg6GFOoEhzm+BestY/A1?= =?us-ascii?Q?IbE0sOo5DXg1ibIeDx7LNlpMMKMZV40gq/uTjAYiu2j2H8eSQyEIozx5sleJ?= =?us-ascii?Q?2gUmlt1EH8wQuAUe7luMJkix3t9965GLHoDBFEo8YUsPcJfBDJup0m1b+d39?= =?us-ascii?Q?0HSOvgwn5NwRWk5WHESkCMqibDPxs9kvy7XsRLRmI4FLntUqSeLGQlBK1lHZ?= =?us-ascii?Q?WvRHMnhJMOtB7bd3BLq1/4oQ1B3nnhFg+6SsWXGSOl/DJkJEg4byeiuSV6Fw?= =?us-ascii?Q?fsl9c9M13EH4l/qMJl/xMnATrAcBCNx8zvtBDUfLcpf+3HnbNIP+MnmX58Mb?= =?us-ascii?Q?QyppyctR5Wr8uCHq1/02ST4lcq6mNlyL3agF7mj44WIic3nkGouywubmbHU3?= =?us-ascii?Q?0GmXGJHa06wxqcvBGNzZ697EdDH1xqqiPE12Ztm+yIQBGoUZ1/1n8OMGFxbk?= =?us-ascii?Q?rtO/BOcD1d5Zo3C00nk=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)(1800799024)(36860700013)(7416014)(376014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Oct 2025 14:36:15.8442 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d87d20b8-addb-48f2-cfe6-08de0a65dda6 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: MWH0EPF000989E9.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6376 Content-Type: text/plain; charset="utf-8" The update_all_static_calls() function re-scans all static call sites and re-patches them. This is used during re-patching. Signed-off-by: David Kaplan --- arch/x86/kernel/static_call.c | 3 ++- include/linux/static_call.h | 2 ++ kernel/static_call_inline.c | 22 ++++++++++++++++++++++ 3 files changed, 26 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/static_call.c b/arch/x86/kernel/static_call.c index 378c388d1b31..2d16d69b17d0 100644 --- a/arch/x86/kernel/static_call.c +++ b/arch/x86/kernel/static_call.c @@ -105,7 +105,8 @@ static void __ref __static_call_transform(void *insn, e= num insn_type type, if (memcmp(insn, code, size) =3D=3D 0) return; =20 - if (system_state =3D=3D SYSTEM_BOOTING || modinit) + /* alternatives_patched is false if we are doing dynamic re-patching. */ + if (system_state =3D=3D SYSTEM_BOOTING || modinit || !alternatives_patche= d) return text_poke_early(insn, code, size); =20 smp_text_poke_single(insn, code, size, emulate); diff --git a/include/linux/static_call.h b/include/linux/static_call.h index 78a77a4ae0ea..cc5f28a04539 100644 --- a/include/linux/static_call.h +++ b/include/linux/static_call.h @@ -181,6 +181,8 @@ struct static_call_tramp_key { extern void __static_call_update(struct static_call_key *key, void *tramp,= void *func); extern int static_call_mod_init(struct module *mod); extern int static_call_text_reserved(void *start, void *end); +extern void update_all_static_calls(struct static_call_site *start, + struct static_call_site *stop, struct module *mod); =20 extern long __static_call_return0(void); =20 diff --git a/kernel/static_call_inline.c b/kernel/static_call_inline.c index 269683d41aa9..504b69496711 100644 --- a/kernel/static_call_inline.c +++ b/kernel/static_call_inline.c @@ -9,6 +9,7 @@ #include #include #include +#include =20 extern struct static_call_site __start_static_call_sites[], __stop_static_call_sites[]; @@ -492,6 +493,27 @@ int static_call_text_reserved(void *start, void *end) return __static_call_mod_text_reserved(start, end); } =20 +void update_all_static_calls(struct static_call_site *start, + struct static_call_site *stop, + struct module *mod) +{ + struct static_call_site *site; + struct static_call_key *key; + + for (site =3D start; site < stop; site++) { + void *site_addr =3D static_call_addr(site); + + /* All init code is gone when this function is called. */ + if (is_kernel_text((u64) site_addr) || + (mod && + within_module_mem_type((u64) site_addr, mod, MOD_TEXT))) { + key =3D static_call_key(site); + arch_static_call_transform(site_addr, NULL, key->func, + static_call_is_tail(site)); + } + } +} + int __init static_call_init(void) { int ret; --=20 2.34.1