Re: [Qemu-devel] USB2.0 disk format failure in windows guest

[Gonglei (Arei)]

From: Gonglei (Arei) 
Sent: Thursday, March 21, 2013 12:41 PM
To: address@hidden
Cc: Yanqiangjun; Hanweidong; Luonengjun
Subject: USB2.0 disk format failure in windows guest

Hi all,
We pass-throughed USB 2.0 disk to guest using usb-host (qemu option: -usb 
-device usb-ehci,id=ehci -device usb-host,bus=ehci.0,hostbus=2,hostaddr=1) on 
xen-4.2.0 and qemu-1.2.2 (also try it on qemu 1.4.0) , it worked fine for 
reading and writing data, but failed when format it in a windows Guest OS such 
as winXP,win7,win2003. We captured usb operations on Dom0, found below logs:
  ...
 Feb  1 11:17:50 linux-bLKBXy kernel: [66642.325169] usb 6-1: usbdev_do_ioctl: 
REAPURBNDELAY
 Feb  1 11:17:50 linux-bLKBXy kernel: [66642.325172] usb 6-1: usbdev_do_ioctl: 
REAPURBNDELAY
 Feb  1 11:17:50 linux-bLKBXy kernel: [66642.325176] usb 6-1: usbdev_do_ioctl: 
REAPURBNDELAY
 Feb  1 11:17:50 linux-bLKBXy kernel: [66642.326757] usb 6-1: urb complete
 Feb  1 11:17:50 linux-bLKBXy kernel: [66642.326761] usb 6-1: userurb 
00007fa196d04b10, ep2 bulk-out, actual_length 4096 status 0
 Feb  1 11:17:50 linux-bLKBXy kernel: [66642.326780] usb 6-1: usbdev_do_ioctl: 
REAPURBNDELAY
 Feb  1 11:17:50 linux-bLKBXy kernel: [66642.326787] usb 6-1: usbdev_do_ioctl: 
REAPURBNDELAY    --- stuck here about one minute
 Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289239] usb 6-1: usbdev_do_ioctl: 
DISCARDURB             --- received a DISCARD instruction
 Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289398] usb 6-1: urb complete
 Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289403] usb 6-1: userurb 
00007fa196d04d00, ep2 bulk-out, actual_length 512 status -2      
 Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289437] usb 6-1: usbdev_do_ioctl: 
REAPURBNDELAY
 Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289450] usb 6-1: usbdev_do_ioctl: 
REAPURBNDELAY
 Feb  1 11:18:50 linux-bLKBXy kernel: [66702.428985] usb 6-1: usbdev_do_ioctl: 
RESET                             -- received a reset instruction to retry
 
We are wondering why the usb operation will be stuck one minute and then 
DISCARD instruction was issued. Was DISCARD instruction triggered by a time out 
in format software? Any ideas?  Thanks.
BTW, a usb format tool diskgenius ( http://www.diskgenius.cn/ ) can format the 
pass-throughed USB 2.0 device successfully in windows guest. In addition, Linux 
guests don't have this issue. Looks software will use different way to format a 
USB disk. We attached usb operation logs: 1) windows format log (failure) 2) 
diskgenius format log (success) 3) linux guest format (success)

-Gonglei

qemu-tracing-log&Dom0.zip
Description: qemu-tracing-log&Dom0.zip