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authorCarsten Otte <cotte@de.ibm.com>2011-10-30 15:17:02 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-10-30 15:16:45 +0100
commit499069e1a421e2a85e76846c3237f00f1a5cb435 (patch)
tree01cf74636909b06b5a986f97a90bf0af5040212d /arch/s390/mm/fault.c
parentcc772456ac9b460693492b3a3d89e8c81eda5874 (diff)
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[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.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index de3af0c..1766def 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;
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