On 19/03/15 20:35, Geoff Levand wrote:
Hi All,
This series adds the core support for kexec re-boots on arm64. This v8 of the
series is mainly just a rebase to Linux-4.0-rc3, and a few very minor changes
requested for v7.
To load a second stage kernel and execute a kexec re-boot on arm64 my patches to
kexec-tools [2], which have not yet been merged upstream, are needed.
I have tested with the ARM VE fast model, the ARM Base model and the ARM
Foundation model with various kernel config options for both the first and
second stage kernels. Kexec on EFI systems works correctly. With the ACPI
kernel patches from [3] applied, kexec on ACPI systems seeems to work correctly.
More ACPI + kexec testing is needed.
Patch 1 here moves the macros from proc-macros.S to asm/assembler.h so that the
dcache_line_size macro it defines can be uesd by kexec's relocate kernel
routine.
Patches 2-4 rework the arm64 hcall mechanism to give the arm64 soft_restart()
routine the ability to switch exception levels from EL1 to EL2 for kernels that
were entered in EL2.
Patches 5-6 add the actual kexec support.
Please consider all patches for inclusion.
[1] https://git.kernel.org/cgit/linux/kernel/git/geoff/linux-kexec.git
[2] https://git.kernel.org/cgit/linux/kernel/git/geoff/kexec-tools.git
Btw, I get the following build failure for kexec-tools master branch,
with Linaro tool chain (crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro
GCC 4.9-2014.09 )
$ ./configure --host=aarch64-linux-gnu
[...]
$ make -j4
kexec/arch/arm64/kexec-arm64.c: In function ‘machine_verify_elf_rel’:
kexec/arch/arm64/kexec-arm64.c:970:29: error: ‘EM_AARCH64’ undeclared
(first use in this function)
return (ehdr->e_machine == EM_AARCH64);
^
kexec/arch/arm64/kexec-arm64.c:970:29: note: each undeclared identifier
is reported only once for each function it appears in
kexec/arch/arm64/kexec-arm64.c:971:1: warning: control reaches end of
non-void function [-Wreturn-type]
}
^
make: *** [kexec/arch/arm64/kexec-arm64.o] Error 1
make: *** Waiting for unfinished jobs....
----
You may need to add the definition of EM_AARCH64 to include/elf.h and
include that instead of linux/elf.h, like the other archs.
Cheers
Suzuki
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