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authorChristian Borntraeger <borntraeger@de.ibm.com>2008-05-21 13:37:29 +0200
committerAvi Kivity <avi@qumranet.com>2008-06-06 21:08:26 +0300
commit74b6b522ec83f9c44fc7743f2adcb24664aa8f45 (patch)
tree8e50f409eaf8b906d2fca6cf45cdbf8c7812bf83 /arch/s390/Makefile
parentb8cee18cc75d7b9dbe6c6526dfae9ab49e84fa95 (diff)
KVM: s390: fix locking order problem in enable_sie
There are potential locking problem in enable_sie. We take the task_lock and the mmap_sem. As exit_mm uses the same locks vice versa, this triggers a lockdep warning. The second problem is that dup_mm and mmput might sleep, so we must not hold the task_lock at that moment. The solution is to dup the mm unconditional and use the task_lock before and afterwards to check if we can use the new mm. dup_mm and mmput are called outside the task_lock, but we run update_mm while holding the task_lock, protection us against ptrace. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Carsten Otte <cotte@de.ibm.com> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/s390/Makefile')
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