diff options
| author | Vasily Gorbik <gor@linux.ibm.com> | 2018-04-04 14:42:41 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-04-10 07:39:00 +0200 |
| commit | 3b9678472bab86ae654cf2c18d5dd551558045be (patch) | |
| tree | a952f6901e8b0bec9f84e60099c502b4e13cf78f /arch/s390/kernel/machine_kexec.c | |
| parent | 0649685073422af82ab8e7d9119b9991403851a6 (diff) | |
| download | linux-3b9678472bab86ae654cf2c18d5dd551558045be.tar.bz2 | |
s390/ipl: correct kdump reipl block checksum calculation
s390 kdump reipl implementation relies on os_info kernel structure
residing in old memory being dumped. os_info contains reipl block,
which is used (if valid) by the kdump kernel for reipl parameters.
The problem is that the reipl block and its checksum inside
os_info is updated only when /sys/firmware/reipl/reipl_type is
written. This sets an offset of a reipl block for "reipl_type" and
re-calculates reipl block checksum. Any further alteration of values
under /sys/firmware/reipl/{reipl_type}/ without subsequent write to
/sys/firmware/reipl/reipl_type lead to incorrect os_info reipl block
checksum. In such a case kdump kernel ignores it and reboots using
default logic.
To fix this, os_info reipl block update is moved right before kdump
execution.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/machine_kexec.c')
| -rw-r--r-- | arch/s390/kernel/machine_kexec.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c index 9adae2a1e1a0..b7020e721ae3 100644 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -252,6 +252,7 @@ void machine_shutdown(void) void machine_crash_shutdown(struct pt_regs *regs) { + set_os_info_reipl_block(); } /* |