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Subject: RE: [Qemu-devel] Bus number and address changes after usb_add?
From: Lonnie Mendez <lmendez19@austin.rr.com>
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Date: Thu, 07 Dec 2006 00:22:45 -0600
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On Thu, 2006-12-07 at 14:11 +0800, Yu, Xiaoyang wrote:
> I see. Guest OS will assign the USB device an address later. Is it possible to store this new address in host OS? Then when the USB device is unplugged, host OS can send "usb_del" command to QEMU to automatically delete the device.

It's possible (on linux host) to register a signal with the kernel that
will trigger when the device is disconnected from the host system.  From
the signal handler the device can then be removed from the guest.  See
USBDEVFS_DISCSIGNAL ioctl in usbdevice_fs.h.