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Date: Sun, 06 Nov 2005 15:11:49 +0100
From: Fabrice Bellard <fabrice@bellard.org>
Subject: Re: [Qemu-devel] USB support
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To: qemu-devel@nongnu.org

Lonnie Mendez wrote:
> On Saturday 05 November 2005 11:10 am, Fabrice Bellard wrote: 
> 
>>1) The host OS must not use the USB device. It means in particular that 
>>no host OS driver must be present for that device. The solution I am 
>>using is to rename the host kernel module "usb-storage.o" to 
>>"usb-storage.o.disabled" so that it is not loaded by Linux. Then QEMU 
>>can exclusively access to the corresponding host storage USB device. The 
>>same apply to every other type of USB devices.
> 
> 
>    usb devfs has a disconnect ioctl (USBDEVFS_DISCONNECT) which
> allows you to disconnect a single device from a driver.
> 
>    A suggestion is to hook the interface up to qemu monitor.  Then you would 
> be able to list usb devices and then claim only the ones you want to use.

Good idea. I am adding something like that:

In the monitor:

'info usbhost' lists the available host USB devices

'usbhost_add 3.4' or 'usbhost_add 1234:5678' adds the USB host device on 
bus 3 at address 4 or the first one matching the vendor ID 0x1234 and 
product ID 0x5678.

The QEMU option '-usbhost x' can be used to do the same as usbhost_add.

Fabrice.