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vhost: use USER_DS in vhost_worker thread 

On some architectures address spaces are set up in a way that this is
not necessary to work properly but on some others (like s390) it is.
Make sure we operate on the user address space to allow copy_xxx_user()
from the vhost_worker() thread by setting it explicitly before calling
use_mm() and revert it after unuse_mm().

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jens Freimann 2012-06-26 00:59:58 +00:00 committed by David S. Miller
parent 57efd44c8c
commit d7ffde35e3
1 changed files with 3 additions and 0 deletions
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3
drivers/vhost/vhost.c
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@ -191,7 +191,9 @@ static int vhost_worker(void *data)
struct vhost_dev *dev = data;
struct vhost_work *work = NULL;
unsigned uninitialized_var(seq);
mm_segment_t oldfs = get_fs();
set_fs(USER_DS);
use_mm(dev->mm);
for (;;) {
@ -229,6 +231,7 @@ static int vhost_worker(void *data)
}
unuse_mm(dev->mm);
set_fs(oldfs);
return 0;
}