Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 852ffd0f authored by Michael Holzheu's avatar Michael Holzheu Committed by Martin Schwidefsky
Browse files

s390/kdump: Clear subchannel ID to signal non-CCW/SCSI IPL 



For CCW and SCSI IPL the hardware sets the subchannel ID and number
correctly at 0xb8. For kdump at 0xb8 normally there is the data of
the previously IPLed system.

In order to be clean now for kdump and kexec always set the subchannel
ID and number to zero. This tells the next OS that no CCW/SCSI IPL
has been done.

Reviewed-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent b8a7a990

arch/s390/kernel/ipl.c

+7 −0
Original line number Diff line number Diff line
@@ -2060,6 +2060,13 @@ void s390_reset_system(void (*func)(void *), void *data) 
	S390_lowcore.program_new_psw.addr =

		PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;



	/*

	 * Clear subchannel ID and number to signal new kernel that no CCW or

	 * SCSI IPL has been done (for kexec and kdump)

	 */

	S390_lowcore.subchannel_id = 0;

	S390_lowcore.subchannel_nr = 0;



	/* Store status at absolute zero */

	store_status();