Patch "vhost_vdpa: support PACKED when setting-getting vring_base" has been added to the 6.3-stable tree

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This is a note to let you know that I've just added the patch titled

    vhost_vdpa: support PACKED when setting-getting vring_base

to the 6.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     vhost_vdpa-support-packed-when-setting-getting-vring.patch
and it can be found in the queue-6.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d3a9322fc545819a800c802db0e227b2658df84f
Author: Shannon Nelson <shannon.nelson@xxxxxxx>
Date:   Mon Apr 24 15:50:31 2023 -0700

    vhost_vdpa: support PACKED when setting-getting vring_base
    
    [ Upstream commit beee7fdb5b56a46415a4992d28dd4c2d06eb52df ]
    
    Use the right structs for PACKED or split vqs when setting and
    getting the vring base.
    
    Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend")
    Signed-off-by: Shannon Nelson <shannon.nelson@xxxxxxx>
    Message-Id: <20230424225031.18947-4-shannon.nelson@xxxxxxx>
    Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
    Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 74c7d1f978b75..779fc44677162 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -572,7 +572,14 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
 		if (r)
 			return r;
 
-		vq->last_avail_idx = vq_state.split.avail_index;
+		if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
+			vq->last_avail_idx = vq_state.packed.last_avail_idx |
+					     (vq_state.packed.last_avail_counter << 15);
+			vq->last_used_idx = vq_state.packed.last_used_idx |
+					    (vq_state.packed.last_used_counter << 15);
+		} else {
+			vq->last_avail_idx = vq_state.split.avail_index;
+		}
 		break;
 	}
 
@@ -590,9 +597,15 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
 		break;
 
 	case VHOST_SET_VRING_BASE:
-		vq_state.split.avail_index = vq->last_avail_idx;
-		if (ops->set_vq_state(vdpa, idx, &vq_state))
-			r = -EINVAL;
+		if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
+			vq_state.packed.last_avail_idx = vq->last_avail_idx & 0x7fff;
+			vq_state.packed.last_avail_counter = !!(vq->last_avail_idx & 0x8000);
+			vq_state.packed.last_used_idx = vq->last_used_idx & 0x7fff;
+			vq_state.packed.last_used_counter = !!(vq->last_used_idx & 0x8000);
+		} else {
+			vq_state.split.avail_index = vq->last_avail_idx;
+		}
+		r = ops->set_vq_state(vdpa, idx, &vq_state);
 		break;
 
 	case VHOST_SET_VRING_CALL:



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