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Subject: Re: [Qemu-devel] [PATCH] Add USB sys file-system support (v2)
From: TJ <linux@tjworld.net>
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References: <1220571341.2638.6.camel@hephaestion>
	<1220580385.2638.15.camel@hephaestion> <48C1346F.3000405@windriver.com>
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Date: Fri, 05 Sep 2008 20:20:54 +0100
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To: Jason Wessel <jason.wessel@windriver.com>
Cc: qemu-devel@nongnu.org, kvm <kvm@vger.kernel.org>

On Fri, 2008-09-05 at 08:30 -0500, Jason Wessel wrote:
> I tried out the patch because it looked reasonably interesting on ubuntu
> 7.10 64bit, and looked like a nice way to attach a local USB device, but
> it did not quite work.
> 
> IE:
> (qemu) info usbhost
>   Device 3.2, speed 12 Mb/s
>     Class 00: USB device 067b:2303, USB-Serial Controller

Jason, I think this is related to handling the USB serial device. Try
another USB device - a flash-memory key for example.

Here's the results of my tests:

Host is Ubuntu Hardy amd64 8.04.1 (2.6.24-21-generic).
VM guest is Ubuntu Gutsy server (2.6.22-14-server)
hypervisor is kvm-74.

I think there is a problem with the usb_add name functions - the
host:VID:PID rarely worked for me so I always use host:Bus.Device
format.

I've got a USB-to-serial converter here too:

Bus 001 Device 004: ID 0711:0230 Magic Control Technology Corp. MCT-232 Serial Port

Here's the output I get:

usb_add host:1.4

husb: open device 1.4
husb: opened /dev/bus/usb/001/004
husb: config #1 need -1
husb: 1 interfaces claimed for configuration -1
husb: grabbed usb device 1.4
usb_linux_update_endp_table: Broken pipe

If however I add a USB flash key:

Bus 005 Device 016: ID 0781:5151 SanDisk Corp. Cruzer Micro 256/512MB Flash Drive

usb_add host:5.16

husb: open device 5.16
husb: opened /dev/bus/usb/005/016
husb: config #1 need -1
husb: 1 interfaces claimed for configuration -1
husb: grabbed usb device 5.16
husb: config #1 need 1
husb: 1 interfaces claimed for configuration 1
husb: config #1 need 1
husb: 1 interfaces claimed for configuration 1

and the device appears and is mountable in the VM.