When the user call VHOST_SET_OWNER ioctl and the vDPA device
has `use_va` set to true, let's call the bind_mm callback.
In this way we can bind the device to the user address space
and directly use the user VA.
The unbind_mm callback is called during the release after
stopping the device.
Signed-off-by: Stefano Garzarella <sgarz...@redhat.com>
---
Notes:
v2:
- call the new unbind_mm callback during the release [Jason]
- avoid to call bind_mm callback after the reset, since the device
is not detaching it now during the reset
drivers/vhost/vdpa.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index dc12dbd5b43b..1ab89fccd825 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -219,6 +219,28 @@ static int vhost_vdpa_reset(struct vhost_vdpa *v)
return vdpa_reset(vdpa);
}
+static long vhost_vdpa_bind_mm(struct vhost_vdpa *v)
+{
+ struct vdpa_device *vdpa = v->vdpa;
+ const struct vdpa_config_ops *ops = vdpa->config;
+
+ if (!vdpa->use_va || !ops->bind_mm)
+ return 0;
+
+ return ops->bind_mm(vdpa, v->vdev.mm);
+}
+
+static void vhost_vdpa_unbind_mm(struct vhost_vdpa *v)
+{
+ struct vdpa_device *vdpa = v->vdpa;
+ const struct vdpa_config_ops *ops = vdpa->config;
+
+ if (!vdpa->use_va || !ops->unbind_mm)
+ return;
+
+ ops->unbind_mm(vdpa);
+}
+
static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp)
{
struct vdpa_device *vdpa = v->vdpa;
@@ -711,6 +733,13 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
break;
default:
r = vhost_dev_ioctl(&v->vdev, cmd, argp);
+ if (!r && cmd == VHOST_SET_OWNER) {
+ r = vhost_vdpa_bind_mm(v);
+ if (r) {
+ vhost_dev_reset_owner(&v->vdev, NULL);
+ break;
+ }
+ }
if (r == -ENOIOCTLCMD)
r = vhost_vdpa_vring_ioctl(v, cmd, argp);
break;
@@ -1285,6 +1314,7 @@ static int vhost_vdpa_release(struct inode *inode, struct
file *filep)
vhost_vdpa_clean_irq(v);
vhost_vdpa_reset(v);
vhost_dev_stop(&v->vdev);
+ vhost_vdpa_unbind_mm(v);
vhost_vdpa_free_domain(v);
vhost_vdpa_config_put(v);
vhost_vdpa_cleanup(v);
--
2.39.2
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