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| author | Carsten Otte <cotte@de.ibm.com> | 2011-10-30 15:17:02 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-10-30 15:16:45 +0100 |
| commit | 499069e1a421e2a85e76846c3237f00f1a5cb435 (patch) | |
| tree | 01cf74636909b06b5a986f97a90bf0af5040212d /arch/s390/include | |
| parent | cc772456ac9b460693492b3a3d89e8c81eda5874 (diff) | |
| download | linux-stable-499069e1a421e2a85e76846c3237f00f1a5cb435.tar.gz linux-stable-499069e1a421e2a85e76846c3237f00f1a5cb435.tar.bz2 linux-stable-499069e1a421e2a85e76846c3237f00f1a5cb435.zip | |
[S390] take mmap_sem when walking guest page table
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>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index c0cb794bb365..bc5f520f6f87 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -696,6 +696,7 @@ void gmap_disable(struct gmap *gmap); int gmap_map_segment(struct gmap *gmap, unsigned long from, unsigned long to, unsigned long length); int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len); +unsigned long __gmap_fault(unsigned long address, struct gmap *); unsigned long gmap_fault(unsigned long address, struct gmap *); /* |