RISC-V: Add crash kernel support

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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>

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Nick Kossifidis 2021-04-19 03:55:39 +03:00 • committed by Palmer Dabbelt

parent e53d28180d

commit 5640975003

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10

arch/riscv/Kconfig

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1

arch/riscv/kernel/Makefile

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46

arch/riscv/kernel/crash_dump.c

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12

arch/riscv/kernel/setup.c

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33

arch/riscv/mm/init.c

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