virtio-scsi: Handle TMF request cancellation asynchronously

For VIRTIO_SCSI_T_TMF_ABORT_TASK and VIRTIO_SCSI_T_TMF_ABORT_TASK_SET,
use scsi_req_cancel_async to start the cancellation.

Because each tmf command may cancel multiple requests, we need to use a
counter to track the number of remaining requests we still need to wait
for.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h
index 60dbfc99a8..d6e5e7935c 100644
--- a/include/hw/virtio/virtio-scsi.h
+++ b/include/hw/virtio/virtio-scsi.h
@@ -214,8 +214,13 @@ typedef struct VirtIOSCSIReq {
     /* Set by dataplane code. */
     VirtIOSCSIVring *vring;
 
-    /* Used for two-stage request submission */
-    QTAILQ_ENTRY(VirtIOSCSIReq) next;
+    union {
+        /* Used for two-stage request submission */
+        QTAILQ_ENTRY(VirtIOSCSIReq) next;
+
+        /* Used for cancellation of request during TMFs */
+        int remaining;
+    };
 
     SCSIRequest *sreq;
     size_t resp_size;