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[S390] zcore: CPU registers are not saved under LPAR

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To save the registers for all CPUs a sigp "store status" is done that
stores the registers to address absolute zero. To access storage at
absolute zero, normally the address of the prefix register of the
accessing CPU has to be used. This does not work when large pages are
active (currently only under LPAR). In order to fix that problem,
instead of memcpy memcpy_real is used, which switches to real mode
where prefixing works.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu
2010-03-24 11:49:50 +01:00
committed by Martin Schwidefsky
parent ae6be51ed0
commit 92fe31329c
4 changed files with 32 additions and 32 deletions
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6
arch/s390/kernel/smp.c
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@ -292,9 +292,9 @@ static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
zfcpdump_save_areas[cpu] = kmalloc(sizeof(struct save_area), GFP_KERNEL);
while (raw_sigp(phy_cpu, sigp_stop_and_store_status) == sigp_busy)
cpu_relax();
memcpy(zfcpdump_save_areas[cpu],
(void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
sizeof(struct save_area));
memcpy_real(zfcpdump_save_areas[cpu],
(void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
sizeof(struct save_area));
}
struct save_area *zfcpdump_save_areas[NR_CPUS + 1];