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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2012-03-11 11:59:32 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-03-11 11:59:29 -0400
commit3ab121ab18669226742891416fe7ecc86dadb047 (patch)
tree328ef8f1e23da33a475ce4e20c0d0490a2e63e76 /drivers/s390
parentfde15c3a3adc7b65cd0610dd6bca4804ee7ffd38 (diff)
[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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/qdio_main.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 770a740a393c..2a0dfcb0bc42 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -18,6 +18,7 @@
#include <linux/atomic.h>
#include <asm/debug.h>
#include <asm/qdio.h>
+#include <asm/ipl.h>
#include "cio.h"
#include "css.h"
@@ -1093,6 +1094,11 @@ static void qdio_handle_activate_check(struct ccw_device *cdev,
q->nr, q->first_to_kick, count, irq_ptr->int_parm);
no_handler:
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
+ /*
+ * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
+ * Therefore we call the LGR detection function here.
+ */
+ lgr_info_log();
}
static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,