vdpa: allow a 32 bit vq alignment

get_vq_align returns u16 now, but that's not enough for
systems/devices with 64K pages. All callers assign it to
a u32 variable anyway, so let's just change the return
value type to u32.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vdpa/ifcvf/ifcvf_main.c

@@ -226,7 +226,7 @@ static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
 	return IFCVF_SUBSYS_VENDOR_ID;
 }
 
-static u16 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
+static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
 {
 	return IFCVF_QUEUE_ALIGNMENT;
 }

drivers/vdpa/vdpa_sim/vdpa_sim.c

@@ -435,7 +435,7 @@ static u64 vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx)
 	return vrh->last_avail_idx;
 }
 
-static u16 vdpasim_get_vq_align(struct vdpa_device *vdpa)
+static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
 {
 	return VDPASIM_QUEUE_ALIGN;
 }

include/linux/vdpa.h

@@ -164,7 +164,7 @@ struct vdpa_config_ops {
 	u64 (*get_vq_state)(struct vdpa_device *vdev, u16 idx);
 
 	/* Device ops */
-	u16 (*get_vq_align)(struct vdpa_device *vdev);
+	u32 (*get_vq_align)(struct vdpa_device *vdev);
 	u64 (*get_features)(struct vdpa_device *vdev);
 	int (*set_features)(struct vdpa_device *vdev, u64 features);
 	void (*set_config_cb)(struct vdpa_device *vdev,