Hi Alan, We pass-throughed USB 2.0 disk to guest using usb-host (qemu option: -device usb-ehci,id=ehci -device usb-host,bus=ehci.0,hostbus=2,hostport=1) on KVM(on linux-3.8.3 or linux-3.0.13) and 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 or 10 seconds 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, We attached usb operation logs: windows format log (failure) Best Regards! Gonglei
Attachment:
format-wins-messages.tar.gz
Description: format-wins-messages.tar.gz
