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| author | Nick Kossifidis <mick@ics.forth.gr> | 2021-04-19 03:55:39 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2021-04-26 08:25:24 -0700 |
| commit | 5640975003d0234da08559677e22ec25b9cb3267 (patch) | |
| tree | a6707467c591146b277e5d846ef5d8fbe9d01bea /arch/riscv/Kconfig | |
| parent | e53d28180d4d0fd12b6d2bde49cb87aa775b6ba8 (diff) | |
| download | linux-5640975003d0234da08559677e22ec25b9cb3267.tar.gz linux-5640975003d0234da08559677e22ec25b9cb3267.tar.bz2 linux-5640975003d0234da08559677e22ec25b9cb3267.zip | |
RISC-V: Add crash kernel support
This patch allows Linux to act as a crash kernel for use with
kdump. Userspace will let the crash kernel know about the
memory region it can use through linux,usable-memory property
on the /memory node (overriding its reg property), and about the
memory region where the elf core header of the previous kernel
is saved, through a reserved-memory node with a compatible string
of "linux,elfcorehdr". This approach is the least invasive and
re-uses functionality already present.
I tested this on riscv64 qemu and it works as expected, you
may test it by retrieving the dmesg of the previous kernel
through /proc/vmcore, using the vmcore-dmesg utility from
kexec-tools.
Signed-off-by: Nick Kossifidis <mick@ics.forth.gr>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index e38bd044610f..61514e0d268e 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -405,6 +405,16 @@ config KEXEC The name comes from the similarity to the exec system call. +config CRASH_DUMP + bool "Build kdump crash kernel" + help + Generate crash dump after being started by kexec. This should + be normally only set in special crash dump kernels which are + loaded in the main kernel with kexec-tools into a specially + reserved region and then later executed after a crash by + kdump/kexec. + + For more details see Documentation/admin-guide/kdump/kdump.rst endmenu |