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| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2012-05-21 13:30:30 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-05-23 19:06:51 +0400 |
| commit | fa7c0043425624ed65b94a6fabe750c7b0af8719 (patch) | |
| tree | 8e21c28d65b56a0bd22af1b9a196083233341b3c /arch/s390/kernel/ipl.c | |
| parent | a9fbf1a53836d4105f95df947ac00e22311dff33 (diff) | |
| download | linux-fa7c0043425624ed65b94a6fabe750c7b0af8719.tar.xz | |
s390/kdump: Use real mode for PSW restart and kexec
Currently the PSW restart handler and kexec are executed in real
mode with DAT=off. For kexec/kdump the function setup_regs() is
called that uses the per-cpu variable "crash_notes". Because
there are situations when the per-cpu implementation uses vmalloc
memory, calling setup_regs() in real mode can cause a program
check interrupt.
To fix that problem this patch changes the following:
* Ensure that diag308_reset() does not change PSW bits to real mode
* Enable DAT in __do_restart() after we switched to an online CPU
* Enable DAT in __machine_kexec() after we switched to the IPL CPU
* Call setup_regs() before we switch to real mode and call purgatory
Reviewed-by: Martin Schwidefsky <schwidefsky@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 'arch/s390/kernel/ipl.c')
| -rw-r--r-- | arch/s390/kernel/ipl.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index 8342e65a140d..dcfdcb3ea163 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -1750,6 +1750,7 @@ static struct kobj_attribute on_restart_attr = static void __do_restart(void *ignore) { + __arch_local_irq_stosm(0x04); /* enable DAT */ smp_send_stop(); #ifdef CONFIG_CRASH_DUMP crash_kexec(NULL); |