Re: [Qemu-devel] [RFC] Add serial number to usbdevice when passthrough to VM
Hi, > But as the backinfo's request, should we extented the usbdevice parameter > like: > > --usbdevice host:[:[:]? -usbdevice is legacy syntax and isn't going to be extended. Adding an "serial" property to usb-host is an option though. Patches are welcome. cheers, Gerd
Re: [Qemu-devel] [RFC] Add serial number to usbdevice when passthrough to VM
On 01/16/2013 03:56 PM, Gerd Hoffmann wrote: On 01/16/13 08:18, Lei Li wrote: Hi guys, Currently we can passthrough the host USB device to the virtual machine. This is done like: –usbdevice host:1234:5678, where 1234 is vendor id, 5678 is product id. But there is a problem. If there are two identical USB devices, where the vendor id and the product id is the same. It's not possible to direct one USB device to VM1 and the second USB device to VM2. You can assign devices by physical port. See docs/usb2.txt Yes, I have read this doc, I know it also support hostbus+hostport or hostbus+hostaddr combinations. But as the backinfo's request, should we extented the usbdevice parameter like: --usbdevice host:[:[:]? What happened if upper app try to passthough those identical USB devices by vendorid+productid combination? AFAIK, Virtualbox support to distingish those device by adding this third parameter 'Serial Number' for vendorid+productid combination. cheers, Gerd -- Lei
Re: [Qemu-devel] [RFC] Add serial number to usbdevice when passthrough to VM
On 01/16/13 08:18, Lei Li wrote: > Hi guys, > > Currently we can passthrough the host USB device to the virtual > machine. This is done like: > > –usbdevice host:1234:5678, where 1234 is vendor id, 5678 is product > id. > > But there is a problem. If there are two identical USB devices, > where the vendor id and the product id is the same. It's not possible > to direct one USB device to VM1 and the second USB device to VM2. You can assign devices by physical port. See docs/usb2.txt cheers, Gerd
[Qemu-devel] [RFC] Add serial number to usbdevice when passthrough to VM
Hi guys, Currently we can passthrough the host USB device to the virtual machine. This is done like: –usbdevice host:1234:5678, where 1234 is vendor id, 5678 is product id. But there is a problem. If there are two identical USB devices, where the vendor id and the product id is the same. It's not possible to direct one USB device to VM1 and the second USB device to VM2. So i want make it possible to distingish those devices by adding a third parameter, the Serial number of the USB device. More backinfo as here: https://bugs.launchpad.net/qemu/+bug/1090602 https://bugzilla.redhat.com/show_bug.cgi?id=640332 When i try to add hack as above and test it, I found that some USB device don't have iSerial number, which appear as 0 (This value is given in the "lsusb -v" as "iSerial" field in USB Descriptor), and usb_host_scan may not get the right iSerial number based on the current implement. To solve this problem, I wonder should we support this Serial Number although it might be zero, or should we add a serial number which is generated in Qemu and unique within the virtual machine, we can use physical location to generate such number for example. Please let me know your suggestions and thoughts! Thanks. -- Lei
