From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Required for ANY_LAYOUT support when the incoming virtio-scsi response
header + fixed size sense buffer payload may span more than a single
iovec entry.
This changes existing code to save cmd->tvc_resp_iod instead of the
first single iovec base pointer from &vq->iov[out].
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/vhost/scsi.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 01c01cb..a03ac41 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -87,8 +87,8 @@ struct tcm_vhost_cmd {
struct scatterlist *tvc_sgl;
struct scatterlist *tvc_prot_sgl;
struct page **tvc_upages;
- /* Pointer to response */
- struct virtio_scsi_cmd_resp __user *tvc_resp;
+ /* Pointer to response header iovec */
+ struct iovec *tvc_resp_iov;
/* Pointer to vhost_scsi for our device */
struct vhost_scsi *tvc_vhost;
/* Pointer to vhost_virtqueue for the cmd */
@@ -703,7 +703,8 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
se_cmd->scsi_sense_length);
memcpy(v_rsp.sense, cmd->tvc_sense_buf,
se_cmd->scsi_sense_length);
- ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
+ ret = memcpy_toiovecend(cmd->tvc_resp_iov, (unsigned char *)&v_rsp,
+ 0, sizeof(v_rsp));
if (likely(ret == 0)) {
struct vhost_scsi_virtqueue *q;
vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
@@ -1159,7 +1160,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
cmd->tvc_vhost = vs;
cmd->tvc_vq = vq;
- cmd->tvc_resp = vq->iov[out].iov_base;
+ cmd->tvc_resp_iov = &vq->iov[out];
pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
cmd->tvc_cdb[0], cmd->tvc_lun);
--
1.9.1
--
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