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s390/kexec_file: Load new kernel to absolute 0

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The leading 64 kB of a kernel image doesn't contain any data needed to boot
the new kernel when it was loaded via kexec_file. Thus kexec_file currently
strips them off before loading the image. Keep the leading 64 kB in order
to be able to pass a ipl_report to the next kernel.

Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Philipp Rudo
2019-03-07 15:56:34 +01:00
committed by Martin Schwidefsky
parent 8e49642613
commit 653beba24d
5 changed files with 28 additions and 18 deletions
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3
arch/s390/kernel/relocate_kernel.S
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@@ -58,10 +58,13 @@ ENTRY(relocate_kernel)
j .base
.done:
sgr %r0,%r0 # clear register r0
cghi %r3,0
je .diag
la %r4,load_psw-.base(%r13) # load psw-address into the register
o %r3,4(%r4) # or load address into psw
st %r3,4(%r4)
mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
.diag:
diag %r0,%r0,0x308
.align 8