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| author | Jens Freimann <jfrei@linux.vnet.ibm.com> | 2012-06-26 00:59:58 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-06-26 21:10:56 -0700 |
| commit | d7ffde35e31a81100d2d0d2c4013cbf527bb32ea (patch) | |
| tree | 0939e0cabb626b4258e53a08f7a7713d534dfab5 /drivers | |
| parent | 57efd44c8cad440fb00ef8078cb018ab2f221373 (diff) | |
| download | lwn-d7ffde35e31a81100d2d0d2c4013cbf527bb32ea.tar.gz lwn-d7ffde35e31a81100d2d0d2c4013cbf527bb32ea.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/vhost/vhost.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 94dbd25caa30..112156f68afb 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -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; } |