[S390] take mmap_sem when walking guest page table

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gmap_fault needs to walk the guest page table. However, parts of
that may change if some other thread does munmap. In that case
gmap_unmap_notifier will also unmap the corresponding parts from
the guest page table. We need to take mmap_sem in order to serialize
these operations.
do_exception now calls __gmap_fault with mmap_sem held which does
not get exported to modules. The exported function, which is called
from KVM, now takes mmap_sem.

Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Carsten Otte 2011-10-30 15:17:02 +01:00 • committed by Martin Schwidefsky

parent cc772456ac

commit 499069e1a4

3 changed files with 16 additions and 2 deletions

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1

arch/s390/include/asm/pgtable.h

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2

arch/s390/mm/fault.c

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15

arch/s390/mm/pgtable.c

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