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Wed, 9 Feb 2022 19:57:24 +0000 Received: from CO1PR10MB4531.namprd10.prod.outlook.com ([fe80::ac06:be4:5723:771c]) by CO1PR10MB4531.namprd10.prod.outlook.com ([fe80::ac06:be4:5723:771c%5]) with mapi id 15.20.4975.011; Wed, 9 Feb 2022 19:57:24 +0000 From: Eric DeVolder To: linux-kernel@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, ebiederm@xmission.com, dyoung@redhat.com, bhe@redhat.com, vgoyal@redhat.com Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, nramas@linux.microsoft.com, thomas.lendacky@amd.com, robh@kernel.org, efault@gmx.de, rppt@kernel.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, eric.devolder@oracle.com Subject: [PATCH v4 02/10] crash hp: Introduce CRASH_HOTPLUG configuration options Date: Wed, 9 Feb 2022 14:56:58 -0500 Message-Id: <20220209195706.51522-3-eric.devolder@oracle.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220209195706.51522-1-eric.devolder@oracle.com> References: <20220209195706.51522-1-eric.devolder@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: DM6PR05CA0046.namprd05.prod.outlook.com (2603:10b6:5:335::15) To CO1PR10MB4531.namprd10.prod.outlook.com (2603:10b6:303:6c::22) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8cf3fd05-da00-40c4-0eaa-08d9ec0663ef X-MS-TrafficTypeDiagnostic: DM6PR10MB3721:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; 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The CRASH_HOTPLUG_ELFCOREHDR_SZ related configuration option is also introduced with this patch. Signed-off-by: Eric DeVolder --- arch/x86/Kconfig | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index ebe8fc76949a..4e3374edab02 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2060,6 +2060,32 @@ config CRASH_DUMP (CONFIG_RELOCATABLE=y). For more details see Documentation/admin-guide/kdump/kdump.rst +config CRASH_HOTPLUG + bool "kernel updates of crash elfcorehdr" + depends on CRASH_DUMP && (HOTPLUG_CPU || MEMORY_HOTPLUG) && KEXEC_FILE + help + Enable the kernel to update the crash elfcorehdr (which contains + the list of CPUs and memory regions) directly when hot plug/unplug + of CPUs or memory. Otherwise userspace must monitor these hot + plug/unplug change notifications via udev in order to + unload-then-reload the crash kernel so that the list of CPUs and + memory regions is kept up-to-date. Note that the udev CPU and + memory change notifications still occur (however, userspace is not + required to monitor for crash dump purposes). + +config CRASH_HOTPLUG_ELFCOREHDR_SZ + depends on CRASH_HOTPLUG + int + default 131072 + help + Specify the maximum size of the elfcorehdr buffer/segment. + The 128KiB default is sized so that it can accommodate 2048 + Elf64_Phdr, where each Phdr represents either a CPU or a + region of memory. + For example, this size can accommodate hotplugging a machine + with up to 1024 CPUs and up to 1024 memory regions (e.g. 1TiB + with 1024 1GiB memory DIMMs). + config KEXEC_JUMP bool "kexec jump" depends on KEXEC && HIBERNATION -- 2.27.0