powerpc/book3s64/kexec: Clear CIABR on kexec

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The value in CIABR persists across kexec which can lead to unintended
results when the new kernel hits the old kernel's breakpoint. For
example:

0:mon> bi $loadavg_proc_show
0:mon> b
   type            address
1 inst   c000000000519060  loadavg_proc_show+0x0/0x130
0:mon> x

$ kexec -l /mnt/vmlinux --initrd=/mnt/rootfs.cpio.gz --append='xmon=off'
$ kexec -e

$ cat /proc/loadavg
Trace/breakpoint trap

Make sure CIABR is cleared so this does not happen.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201207010519.15597-1-jniethe5@gmail.com

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Jordan Niethe 2020-12-07 12:05:18 +11:00 • committed by Michael Ellerman

parent 8817aabb1b

commit 4bb3219837

1 changed files with 5 additions and 0 deletions

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arch/powerpc/include/asm/book3s/64/kexec.h

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