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Re: [Qemu-devel] [PATCH] hid: Extend the event queue size to 1024

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH] hid: Extend the event queue size to 1024
Date: Mon, 18 Apr 2016 11:21:38 +0200

On Mo, 2016-04-18 at 09:26 +0200, Alexander Graf wrote:
> On 18.04.16 08:53, Gerd Hoffmann wrote:
> >   Hi,
> > 
> >> Vnc already uses qemu_input_event_send_key_delay today, so I'm not sure 
> >> where things fall apart.
> > 
> > Well, not everywhere.  Try the attached patch.
> > 
> > Also worth trying:
> >  * use xhci instead of ohci (current slof should handle
> >    kbd-via-xhci fine)
> >  * use virtio-keyboard (no slof driver yet as far I know, also needs
> >    a recent linux kernel).
> Ideally I would really like to switch to virtio-input and virtio-gpu for
> AArch64, but there are no drivers at all in OVMF. Do you have any plans
> to write them?

Not investigated yet.  There are virtio 1.0 patches in flight for edk2,
once they are landed it should be alot simpler (virtio 1.0 is mandatory
for virtio-gpu and virtio-input).

Keyboard should be easy, it's a simple device.

GPU is tricky.  Guest is expected to explicitly request display updates.
So simply setting up a dump framebuffer, then depending on dirty page
tracking for screen updates isn't going to fly.  Not sure EFI can handle

The virtio-vga device has a vga compatibility mode additionally to
native virtio.  SLOF uses that IIRC.  But I think on aarch64 that isn't
going to fly either due to the cache coherency issues there.


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