1 files changed, 41 insertions, 4 deletions
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 12c6a21202..db54d104be 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -29,6 +29,43 @@
 #include "hw/virtio/virtio-access.h"
 #include "trace.h"
 
+typedef struct VirtIOSCSIReq {
+    /*
+     * Note:
+     * - fields up to resp_iov are initialized by virtio_scsi_init_req;
+     * - fields starting at vring are zeroed by virtio_scsi_init_req.
+     */
+    VirtQueueElement elem;
+
+    VirtIOSCSI *dev;
+    VirtQueue *vq;
+    QEMUSGList qsgl;
+    QEMUIOVector resp_iov;
+
+    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;
+    enum SCSIXferMode mode;
+    union {
+        VirtIOSCSICmdResp     cmd;
+        VirtIOSCSICtrlTMFResp tmf;
+        VirtIOSCSICtrlANResp  an;
+        VirtIOSCSIEvent       event;
+    } resp;
+    union {
+        VirtIOSCSICmdReq      cmd;
+        VirtIOSCSICtrlTMFReq  tmf;
+        VirtIOSCSICtrlANReq   an;
+    } req;
+} VirtIOSCSIReq;
+
 static inline int virtio_scsi_get_lun(uint8_t *lun)
 {
     return ((lun[2] << 8) | lun[3]) & 0x3FFF;
@@ -45,7 +82,7 @@ static inline SCSIDevice *virtio_scsi_device_get(VirtIOSCSI *s, uint8_t *lun)
     return scsi_device_get(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
 }
 
-void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req)
+static void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(s);
     const size_t zero_skip =
@@ -58,7 +95,7 @@ void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req)
     memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip);
 }
 
-void virtio_scsi_free_req(VirtIOSCSIReq *req)
+static void virtio_scsi_free_req(VirtIOSCSIReq *req)
 {
     qemu_iovec_destroy(&req->resp_iov);
     qemu_sglist_destroy(&req->qsgl);
@@ -801,8 +838,8 @@ static void virtio_scsi_reset(VirtIODevice *vdev)
     s->events_dropped = false;
 }
 
-void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
-                            uint32_t event, uint32_t reason)
+static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
+                                   uint32_t event, uint32_t reason)
 {
     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
     VirtIOSCSIReq *req;