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s390/dump: rework CPU register dump code

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To collect the CPU registers of the crashed system allocated a single
page with memblock_alloc_base and use it as a copy buffer. Replace the
stop-and-store-status sigp with a store-status-at-address sigp in
smp_save_dump_cpus() and smp_store_status(). In both cases the target
CPU is already stopped and store-status-at-address avoids the detour
via the absolute zero page.

For kexec simplify s390_reset_system and call store_status() before
the prefix register of the boot CPU has been set to zero. Use STPX
to store the prefix register and remove dump_prefix_page.

Acked-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2015-10-29 10:28:26 +01:00
parent f08b841463
commit 1a36a39e22
12 changed files with 158 additions and 145 deletions
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2
drivers/s390/char/zcore.c
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@@ -129,8 +129,6 @@ static int __init init_cpu_info(void)
TRACE("could not copy from HSA\n");
return -EIO;
}
if (MACHINE_HAS_VX)
save_vx_regs_safe(sa_ext->vx_regs);
return 0;
}