[S390] kernel: Add z/VM LGR detection
authorMichael Holzheu <holzheu@linux.vnet.ibm.com>
Sun, 11 Mar 2012 15:59:32 +0000 (11:59 -0400)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Sun, 11 Mar 2012 15:59:29 +0000 (11:59 -0400)
commit3ab121ab18669226742891416fe7ecc86dadb047
tree328ef8f1e23da33a475ce4e20c0d0490a2e63e76
parentfde15c3a3adc7b65cd0610dd6bca4804ee7ffd38
[S390] kernel: Add z/VM LGR detection

Currently the following mechanisms are available to move active
Linux on System z instances between machines:
* z/VM 6.2 SSI (Single System Image)
* Suspend/resume
For moving Linux instances in this patch the term LGR (Linux Guest
Relocation) is used. Because such an operation is critical, it
should be detectable from Linux. With this patch for both, a live
system and a kernel dump, the information about LGRs is accessible.
To identify a guest, stsi and stfle data is used. A new function
lgr_info_log() compares the current data (lgr_info_cur) with the
last recorded one (lgr_info_last). In case the two data sets differ,
lgr_info_cur is logged to the "lgr" s390dbf.

The following trigger points call lgr_info_log():
* panic
* die
* kdump
* LGR timer
* PSW restart
* QDIO recovery
* resume

This patch also changes the s390dbf hex_ascii view. Now only printable ASCII
characters are shown.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
13 files changed:
arch/s390/include/asm/debug.h
arch/s390/include/asm/ipl.h
arch/s390/include/asm/system.h
arch/s390/kernel/Makefile
arch/s390/kernel/debug.c
arch/s390/kernel/early.c
arch/s390/kernel/ipl.c
arch/s390/kernel/lgr.c [new file with mode: 0644]
arch/s390/kernel/machine_kexec.c
arch/s390/kernel/smp.c
arch/s390/kernel/swsusp_asm64.S
arch/s390/kernel/traps.c
drivers/s390/cio/qdio_main.c