From: Eric DeVolder <eric.devolder@oracle.com> 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 [thread overview] Message-ID: <20220209195706.51522-3-eric.devolder@oracle.com> (raw) In-Reply-To: <20220209195706.51522-1-eric.devolder@oracle.com> Support for CPU and memory hotplug for crash is controlled by the CRASH_HOTPLUG configuration option, introduced by this patch. The CRASH_HOTPLUG_ELFCOREHDR_SZ related configuration option is also introduced with this patch. Signed-off-by: Eric DeVolder <eric.devolder@oracle.com> --- 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
WARNING: multiple messages have this Message-ID (diff)
From: Eric DeVolder <eric.devolder@oracle.com> To: kexec@lists.infradead.org Subject: [PATCH v4 02/10] crash hp: Introduce CRASH_HOTPLUG configuration options Date: Wed, 9 Feb 2022 14:56:58 -0500 [thread overview] Message-ID: <20220209195706.51522-3-eric.devolder@oracle.com> (raw) In-Reply-To: <20220209195706.51522-1-eric.devolder@oracle.com> Support for CPU and memory hotplug for crash is controlled by the CRASH_HOTPLUG configuration option, introduced by this patch. The CRASH_HOTPLUG_ELFCOREHDR_SZ related configuration option is also introduced with this patch. Signed-off-by: Eric DeVolder <eric.devolder@oracle.com> --- 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
next prev parent reply other threads:[~2022-02-09 20:00 UTC|newest] Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-02-09 19:56 [PATCH v4 00/10] crash: Kernel handling of CPU and memory hot un/plug Eric DeVolder 2022-02-09 19:56 ` Eric DeVolder 2022-02-09 19:56 ` [PATCH v4 01/10] crash: fix minor typo/bug in debug message Eric DeVolder 2022-02-09 19:56 ` Eric DeVolder 2022-02-09 19:56 ` Eric DeVolder [this message] 2022-02-09 19:56 ` [PATCH v4 02/10] crash hp: Introduce CRASH_HOTPLUG configuration options Eric DeVolder 2022-02-23 3:25 ` Baoquan He 2022-02-23 3:25 ` Baoquan He 2022-03-01 20:04 ` Eric DeVolder 2022-03-01 20:04 ` Eric DeVolder 2022-03-02 9:20 ` David Hildenbrand 2022-03-02 9:20 ` David Hildenbrand 2022-03-03 10:22 ` Baoquan He 2022-03-03 10:22 ` Baoquan He 2022-03-03 11:36 ` David Hildenbrand 2022-03-03 11:36 ` David Hildenbrand 2022-03-03 12:08 ` Baoquan He 2022-03-03 12:08 ` Baoquan He 2022-03-03 15:31 ` Eric DeVolder 2022-03-03 15:31 ` Eric DeVolder 2022-02-09 19:56 ` [PATCH v4 03/10] crash hp: definitions and prototype changes Eric DeVolder 2022-02-09 19:56 ` Eric DeVolder 2022-02-23 3:43 ` Baoquan He 2022-02-23 3:43 ` Baoquan He 2022-03-01 20:04 ` Eric DeVolder 2022-03-01 20:04 ` Eric DeVolder 2022-02-09 19:57 ` [PATCH v4 04/10] crash hp: prototype change for crash_prepare_elf64_headers Eric DeVolder 2022-02-09 19:57 ` Eric DeVolder 2022-02-23 3:46 ` Baoquan He 2022-02-23 3:46 ` Baoquan He 2022-03-01 20:05 ` Eric DeVolder 2022-03-01 20:05 ` Eric DeVolder 2022-02-09 19:57 ` [PATCH v4 05/10] crash hp: introduce helper functions un/map_crash_pages Eric DeVolder 2022-02-09 19:57 ` Eric DeVolder 2022-02-23 3:58 ` Baoquan He 2022-02-23 3:58 ` Baoquan He 2022-03-01 20:06 ` Eric DeVolder 2022-03-01 20:06 ` Eric DeVolder 2022-02-09 19:57 ` [PATCH v4 06/10] crash hp: generic crash hotplug support infrastructure Eric DeVolder 2022-02-09 19:57 ` Eric DeVolder 2022-02-23 3:59 ` Baoquan He 2022-02-23 3:59 ` Baoquan He 2022-03-01 20:07 ` Eric DeVolder 2022-03-01 20:07 ` Eric DeVolder 2022-02-09 19:57 ` [PATCH v4 07/10] crash hp: exclude elfcorehdr from the segment digest Eric DeVolder 2022-02-09 19:57 ` Eric DeVolder 2022-02-23 4:00 ` Baoquan He 2022-02-23 4:00 ` Baoquan He 2022-03-01 20:07 ` Eric DeVolder 2022-03-01 20:07 ` Eric DeVolder 2022-02-09 19:57 ` [PATCH v4 08/10] crash hp: exclude hot remove cpu from elfcorehdr notes Eric DeVolder 2022-02-09 19:57 ` Eric DeVolder 2022-02-23 4:04 ` Baoquan He 2022-02-23 4:04 ` Baoquan He 2022-03-01 20:08 ` Eric DeVolder 2022-03-01 20:08 ` Eric DeVolder 2022-02-09 19:57 ` [PATCH v4 09/10] crash hp: Add x86 crash hotplug support for kexec_file_load Eric DeVolder 2022-02-09 19:57 ` Eric DeVolder 2022-02-23 4:10 ` Baoquan He 2022-02-23 4:10 ` Baoquan He 2022-03-01 20:12 ` Eric DeVolder 2022-03-01 20:12 ` Eric DeVolder 2022-03-03 10:27 ` Baoquan He 2022-03-03 10:27 ` Baoquan He 2022-02-09 19:57 ` [PATCH v4 10/10] crash hp: Add x86 crash hotplug support for kexec_load Eric DeVolder 2022-02-09 19:57 ` Eric DeVolder 2022-02-21 4:08 ` [PATCH v4 00/10] crash: Kernel handling of CPU and memory hot un/plug Baoquan He 2022-02-21 4:08 ` Baoquan He
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