Re: [Qemu-devel] [RFC v9 23/27] virtio-blk: Stub out SCSI commands

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Jul 18, 2012 at 04:07:50PM +0100, Stefan Hajnoczi wrote:
> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

Why?

> ---
>  hw/virtio-blk.c |   25 +++++++++++++++++--------
>  1 file changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
> index 51807b5..8734029 100644
> --- a/hw/virtio-blk.c
> +++ b/hw/virtio-blk.c
> @@ -215,14 +215,8 @@ static void process_request(IOQueue *ioq, struct iovec iov[], unsigned int out_n
>  
>      /* TODO Linux sets the barrier bit even when not advertised! */
>      uint32_t type = outhdr->type & ~VIRTIO_BLK_T_BARRIER;
> -
> -    if (unlikely(type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_FLUSH))) {
> -        fprintf(stderr, "virtio-blk unsupported request type %#x\n", outhdr->type);
> -        exit(1);
> -    }
> -
>      struct iocb *iocb;
> -    switch (type & (VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_FLUSH)) {
> +    switch (type & (VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_SCSI_CMD | VIRTIO_BLK_T_FLUSH)) {
>      case VIRTIO_BLK_T_IN:
>          if (unlikely(out_num != 1)) {
>              fprintf(stderr, "virtio-blk invalid read request\n");
> @@ -239,6 +233,21 @@ static void process_request(IOQueue *ioq, struct iovec iov[], unsigned int out_n
>          iocb = ioq_rdwr(ioq, false, &iov[1], out_num - 1, outhdr->sector * 512UL); /* TODO is it always 512? */
>          break;
>  
> +    case VIRTIO_BLK_T_SCSI_CMD:
> +        if (unlikely(in_num == 0)) {
> +            fprintf(stderr, "virtio-blk invalid SCSI command request\n");
> +            exit(1);
> +        }
> +
> +        /* TODO support SCSI commands */
> +        {
> +            VirtIOBlock *s = container_of(ioq, VirtIOBlock, ioqueue);
> +            inhdr->status = VIRTIO_BLK_S_UNSUPP;
> +            vring_push(&s->vring, head, sizeof *inhdr);
> +            virtio_blk_notify_guest(s);
> +        }
> +        return;
> +
>      case VIRTIO_BLK_T_FLUSH:
>          if (unlikely(in_num != 1 || out_num != 1)) {
>              fprintf(stderr, "virtio-blk invalid flush request\n");
> @@ -256,7 +265,7 @@ static void process_request(IOQueue *ioq, struct iovec iov[], unsigned int out_n
>          return;
>  
>      default:
> -        fprintf(stderr, "virtio-blk multiple request type bits set\n");
> +        fprintf(stderr, "virtio-blk unsupported request type %#x\n", outhdr->type);
>          exit(1);
>      }
>  
> -- 
> 1.7.10.4