Re: [Qemu-devel] Mousegrab broken with vfio in 2.1.0 (was: [PATCH 00/25] qemu gtk ui overhaul)

[Gerd Hoffmann <kraxel@redhat.com>]

On Do, 2014-08-07 at 00:22 +0200, Benedikt Morbach wrote:
> I think one of those gtk patches broke mouse/keyboard grab for my
> Windows 8 vfio/vga-passthrough setup in 2.1.0 and I was instructed on
> IRC to report that here.
> 
> With 2.0.0 I got a black qemu window with "This VM has no graphic
> display device", which I could click on to get a mouse grab.

Yes, this is (intentionally) gone in 2.1.
No vga -> no graphic display.

> If I press Ctrl-Alt-g or use the corresponding menu entry, the gtk
> window grabs the input devices and the titlebar changes to "press
> Ctrl-Alt-g to release grab", but none of the input reaches the vm.

It shouldn't allow the grab in the first place.

But, yes, any input (grab being active or not) is only routed to the
guest in case a graphic display tab is the active one.  You don't want
the guest see the stuff you are typing into the qemu monitor.

> If I drop the "-vga none" I can get a mouse-grab, but the passed-through
> gpu won't work, so this is no option for me.

Worth trying: '-vga none -device secondary-vga'.


How does your setup look like?  Two gfx cards, one for the host, one for
the guest?  Then have qemu running on the host display, let qemu grab
the input and feed mouse (kbd too?) input to the guest that way?

It's a bit strange, but I think we don't have a better way to do it
(without additional physical devices).  In case you have a spare usb
mouse you can simply plug it in and use usb-host to assign it to the
guest, which is probably more comfortable than grabbing/ungrabbing when
switching between host and guest.


cheers,
  Gerd