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Re: [Xen-devel] [PATCH V7 6/7] xl: add usb-assignable-list command



On 10/07/2015 01:55 PM, Ian Campbell wrote:
On Wed, 2015-10-07 at 13:49 +0200, Juergen Gross wrote:
On 10/07/2015 01:39 PM, Ian Campbell wrote:
On Wed, 2015-10-07 at 13:25 +0200, Juergen Gross wrote:
The "usb-assignable-list" that Chunyan has submitted will give you
a
list of all dom0 USB devices that have not yet been assigned to a
guest.
    It should be basically equivalent to "lsusb", except that it
filters
out devices which have already been assigned to VMs.

Right, that does sound like useful enough functionality to justify not
just
using lsusb.

In the e-mail you respond to, I was suggesting that

# xl usb-list --all

would show you usb devices attached to every VM, and also USB
devices
attached to no VM, and that

And would "xl usb-list" list all domain attached to every VM but not
the
unattached ones?

# xl usb-list --host

would show you only host usb devices not attached to any VM.

I think it's the second bit if functionality which Juergen is keen
be
available in some form or other.

Exactly.

I'm happy with this proposal too.

Is the distinction between --host and --all important to you? Assuming
unassigned devices are clearly indicated in the --all output (as they
should be).

Depends on how the output would look like.

In case it either isn't containing VMs without any attached USB device
or the unassigned devices are listed at the end this would be okay. I
just wouldn't want to have to scroll a lot in case of a host with 1000
domains.

Makes sense.

BTW: In case you don't have the --host option it would be nice to omit
--all as well and just assume --all when no domain was specified (like
xl list).

I think "xl usb-list" should list the devices attached to all domains, for
sure. I'm ambivalent about whether it also lists unattached devices (in
which case --all is unnecessary) or if --all is required to get those.

I'd go for nuking the --all option. I suppose xl usb-list without
specifying a domain will nearly always be used to see the unassigned
devices and not "uuh, to which domain did I assign device x?".


Juergen


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