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| author | Carsten Otte <cotte@de.ibm.com> | 2011-10-30 18:17:02 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-10-30 18:16:45 +0400 |
| commit | 499069e1a421e2a85e76846c3237f00f1a5cb435 (patch) | |
| tree | 01cf74636909b06b5a986f97a90bf0af5040212d /arch/s390/mm/fault.c | |
| parent | cc772456ac9b460693492b3a3d89e8c81eda5874 (diff) | |
| download | linux-499069e1a421e2a85e76846c3237f00f1a5cb435.tar.xz | |
[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/mm/fault.c')
| -rw-r--r-- | arch/s390/mm/fault.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index de3af0c053c0..1766def5bc3f 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -307,7 +307,7 @@ static inline int do_exception(struct pt_regs *regs, int access, #ifdef CONFIG_PGSTE if (test_tsk_thread_flag(current, TIF_SIE) && S390_lowcore.gmap) { - address = gmap_fault(address, + address = __gmap_fault(address, (struct gmap *) S390_lowcore.gmap); if (address == -EFAULT) { fault = VM_FAULT_BADMAP; |