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

[Stefan Hajnoczi <stefanha@xxxxxxxxxxxxxxxxxx>]

Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxxxxxxxxxx>
---
 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

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