[Qemu-devel] Re: [PATCH] Add VirtIO Frame Buffer Support

[Avi Kivity]

On 11/03/2009 08:39 AM, Alexander Graf wrote:
> On 03.11.2009, at 07:34, Avi Kivity wrote:
>
> > On 11/03/2009 08:27 AM, Alexander Graf wrote:
> > > > How does it work today?
> > >
> > > You boot into a TERM=dumb line based emulation on 3270 (worst thing 
> > > haunting people's nightmares ever), trying to get out of that mode 
> > > as quickly as possible and off into SSH / VNC.
> >
> > Despite the coolness factor, IMO a few minutes during install time do 
> > not justify a new hardware model and a new driver.
>
> It's more than just coolness factor. There are use cases out there 
> (www.susestudio.com) that don't want to rely on the guest exporting a 
> VNC server to the outside just to access graphics. 

Instead you rely on the guest using virtio-fb. Since we have to make 
guest modifications, why not go for the simpler ones?

> You also want to see boot messages, have a console login screen, 

virtio-console does that, except for the penguins.  Better, since you 
can scroll back.

> be able to debug things without switching between virtio-console and 
> vnc, etc. etc.

Render virtio-console on your vnc session.  We do that already, no? 
(well, the host's vnc session, not the guest's).

> The hardware model isn't exactly new either. It's just the next 
> logical step to a full PV machine using virtio. If the virtio-fb stuff 
> turns out to be really fast and reliable, I could even imagine it 
> being the default target for kvm on ppc as well, as we can't switch 
> resolutions on the fly there atm.

We could with vmware-vga.

> > Why?  the guest will typically have networking when it's set up, so 
> > it should have network access during install.  You can easily use 
> > slirp redirection and the built-in dhcp server to set this up with 
> > relatively few hassles.
>
> That's how I use it right now. It's no fun.

The toolstack should hide the unfun parts.

--
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.