Re: [Xen-devel] [PATCH 2 of 2] xl: Accept a list for usbdevice in config file

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Thu, Nov 29, 2012 at 11:44 AM, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:

qemu.git/vl.c suggests other options might include, "disk:", "serial:", "net:" and "bt:"; other non-colon-including options include "keyboard", "mouse", "wacom-tablet", and "braile".

On the other hand, a number of these seem to require supplementary options to work well; e.g., network and bt (bluetooth) require one argument to hook up a USB device, and another option to say how it's connected to what.

It's also interesting to note that the KVM documentation doesnt' mention using "-usb" and "-usbdevice" at all -- they seem to prefer using "-device" to specify hubs &c.

Speaking of which, the KVM docs refer to "-usb" and "-usbdevice" as "legacy interfaces", which will only get you piix3.  It seems like exposing the full capabilities of qemu would mean either 1) coming up with a full specifciation which we can then translate into qemu directives, as libvirt seems to do, or 2) just recommend people construct their own qemu command-line options to pass through.

It's not 100% clear to me that 1 is actually less complicated from a user perspective in the long run than 2, and it's certainly a lot more work...

 -George

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