Hi James,
I meet this problem before but not in the same scenario.
I use WinPv driver WDF version and attach a lot of vbd and vif device,
such as 4 disks and 8 NICs. After WinPv driver install correctly, reboot
the vm. Vm cannot reboot correctly every times. And the debug log is
very similar as Sandro provided. I change the backend bit width detect
code as follow. In my test box, WinPv driver works ok till now. Please
have a try if you are interested in it.
+XenVbd_TestBitWidth(PXENVBD_DEVICE_DATA DeviceData, PXENVBD_TARGET_DATA
TargetData)
+{
+ blkif_request_t *req;
+ ULONG i;
+ int notify;
+
+ KdPrint((__DRIVER_NAME " --> XenVbd_TestBitWidth\n"));
+ req = RING_GET_REQUEST(&TargetData->Ring, TargetData->Ring.req_prod_pvt);
+ req->id = 0;
+ KdPrint((__DRIVER_NAME " req id : %d\n",req->id));
+ req->operation = 0xff;
+ req->nr_segments = 0;
+ for (i = 0; i < req->nr_segments; i++)
+ {
+ req->seg[i].gref = 0xffffffff;
+ req->seg[i].first_sect = 0xff;
+ req->seg[i].last_sect = 0xff;
+ }
+ TargetData->Ring.req_prod_pvt++;
+
+ RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&TargetData->Ring, notify);
+ KdPrint((__DRIVER_NAME " 1st notify: %d\n", notify));
+ if (notify)
+ DeviceData->XenDeviceData->XenInterface.EvtChn_Notify(
+ DeviceData->XenDeviceData->XenInterface.InterfaceHeader.Context,
+ TargetData->EventChannel);
+ KeMemoryBarrier();
+
+ req = RING_GET_REQUEST(&TargetData->Ring, TargetData->Ring.req_prod_pvt);
+ req->id = 1;
+ KdPrint((__DRIVER_NAME " req id : %d\n",req->id));
+ req->operation = 0xff;
+ req->nr_segments = 0;
+ for (i = 0; i < req->nr_segments; i++)
+ {
+ req->seg[i].gref = 0xffffffff;
+ req->seg[i].first_sect = 0xff;
+ req->seg[i].last_sect = 0xff;
+ }
+ TargetData->Ring.req_prod_pvt++;
+
+ RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&TargetData->Ring, notify);
+ KdPrint((__DRIVER_NAME " 2nd notify: %d\n", notify));
+ if (notify)
+ DeviceData->XenDeviceData->XenInterface.EvtChn_Notify(
+ DeviceData->XenDeviceData->XenInterface.InterfaceHeader.Context,
+ TargetData->EventChannel);
+ KeMemoryBarrier();
+ KdPrint((__DRIVER_NAME " <-- XenVbd_TestBitWidth\n"));
+ return;
+}
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