@@ -24,6 +24,10 @@
#define VIRTIO_SCSI_MAX_TARGET 255
#define VIRTIO_SCSI_MAX_LUN 16383
+/* Feature Bits */
+#define VIRTIO_SCSI_F_INOUT 0
+#define VIRTIO_SCSI_F_HOTPLUG 1
+
/* Response codes */
#define VIRTIO_SCSI_S_OK 0
#define VIRTIO_SCSI_S_OVERRUN 1
@@ -60,6 +64,11 @@
#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
+/* Reasons for transport reset event */
+#define VIRTIO_SCSI_EVT_RESET_HARD 0
+#define VIRTIO_SCSI_EVT_RESET_RESCAN 1
+#define VIRTIO_SCSI_EVT_RESET_REMOVED 2
+
/* SCSI command request, followed by data-out */
typedef struct {
uint8_t lun[8]; /* Logical Unit Number */
@@ -206,11 +215,13 @@ static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg,
static void virtio_scsi_parse_req(VirtIOSCSI *s, VirtQueue *vq,
VirtIOSCSIReq *req)
{
- assert(req->elem.out_num && req->elem.in_num);
+ assert(req->elem.in_num);
req->vq = vq;
req->dev = s;
req->sreq = NULL;
- req->req.buf = req->elem.out_sg[0].iov_base;
+ if (req->elem.out_num) {
+ req->req.buf = req->elem.out_sg[0].iov_base;
+ }
req->resp.buf = req->elem.in_sg[0].iov_base;
if (req->elem.out_num > 1) {
@@ -545,6 +556,7 @@ static void virtio_scsi_set_config(VirtIODevice *vdev,
static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
uint32_t requested_features)
{
+ requested_features |= (1UL << VIRTIO_SCSI_F_HOTPLUG);
return requested_features;
}
@@ -577,6 +589,60 @@ static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
return 0;
}
+static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
+ uint32_t event, uint32_t reason)
+{
+ VirtIOSCSIReq *req = virtio_scsi_pop_req(s, s->event_vq);
+ VirtIOSCSIEvent *evt;
+
+ if (req) {
+ int in_size;
+ if (req->elem.out_num || req->elem.in_num != 1) {
+ virtio_scsi_bad_req();
+ }
+
+ in_size = req->elem.in_sg[0].iov_len;
+ if (in_size < sizeof(VirtIOSCSIEvent)) {
+ virtio_scsi_bad_req();
+ }
+
+ evt = req->resp.event;
+ memset(evt, 0, sizeof(VirtIOSCSIEvent));
+ evt->event = event;
+ evt->reason = reason;
+ evt->lun[0] = 1;
+ evt->lun[1] = dev->id;
+
+ /* Linux wants us to keep the same encoding we use for REPORT LUNS. */
+ if (dev->lun >= 256) {
+ evt->lun[2] = (dev->lun >> 8) | 0x40;
+ }
+ evt->lun[3] = dev->lun & 0xFF;
+ virtio_scsi_complete_req(req);
+ }
+}
+
+static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev)
+{
+ VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
+
+ if (((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) &&
+ (s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
+ VIRTIO_SCSI_EVT_RESET_RESCAN);
+ }
+}
+
+static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev)
+{
+ VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
+
+ if ((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
+ virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
+ VIRTIO_SCSI_EVT_RESET_REMOVED);
+ }
+}
+
static struct SCSIBusInfo virtio_scsi_scsi_info = {
.tcq = true,
.max_channel = VIRTIO_SCSI_MAX_CHANNEL,
@@ -585,6 +651,8 @@ static struct SCSIBusInfo virtio_scsi_scsi_info = {
.complete = virtio_scsi_command_complete,
.cancel = virtio_scsi_request_cancelled,
+ .hotplug = virtio_scsi_hotplug,
+ .hot_unplug = virtio_scsi_hot_unplug,
.get_sg_list = virtio_scsi_get_sg_list,
.save_request = virtio_scsi_save_request,
.load_request = virtio_scsi_load_request,