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Re: [Xen-devel] [Patch RFC 1/4] usb: support device specification via <bus>-<port>

On 07/17/2015 10:28 AM, Gerd Hoffmann wrote:
On Fr, 2015-07-17 at 09:32 +0200, Juergen Gross wrote:
On 07/17/2015 08:59 AM, Gerd Hoffmann wrote:
On Do, 2015-07-16 at 17:47 +0200, Juergen Gross wrote:
Today a host usb device can be specified either via <vendor>:<product>
or via <bus>.<device> syntax. Add the possibility to specify it via
<bus>-<port> as this is needed for the support of xen pvusb backend.

-device usb-host,hostbus=<bus>,hostport=<port> should already do what
you want.

The problem is I have to add the device while qemu is already running,
so I'm using usb_host_device_open(). To be able to specify the device
via <bus>-<port> I have to add the capability to find the device by
those parameters.

I haven't found another way to achieve this.

device_add monitor command.

Okay. I guess the USBDevice for the added device can be obtained
in USBPortOps->attach via USBPort->dev ?

Doing a quick search through the sources I couldn't find a way to
issue a monitor command from inside qemu. I assume I'd have to use
do_device_add() directly?


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