Can I simulate a virtual Dual-Head Graphiccard?

Can I simulate a virtual Dual-Head Graphiccard?

[Axel Kittenberger]

Hello,

This is a question I was not able to answer with a search. I've been 
using kvm now quite successfully as server side solution. Now I want to 
use it on a particular desktop to have a Windows 7 Guest on a native 
Linux system. Well this desktop has two Screens, and I'm sure its 
expected to have the Guest also on both screens.

Supposevly I could just simulate a very wide Screen and have the host 
split it (either SDL or VNC). However, this is not quite the same, as 
the guest will think exactly that, 1 wide screen. Meaning it will put 
all the messageboxes exactly in the middle between the two screens, have 
the startbar spawn on both screens and what not. So two screens are 
handled a tad differently than one wide.

Is this possible with kvm?
Either simulate a dual head mapping to one wide SDL/VNC display. Or 
having two SDL/VNC displays?

Kind regards,
Axel Kittenberger

Re: Can I simulate a virtual Dual-Head Graphiccard?

[Brian Jackson]

On Wednesday, April 28, 2010 03:08:24 pm Axel Kittenberger wrote:
> Hello,
> 
> This is a question I was not able to answer with a search. I've been
> using kvm now quite successfully as server side solution. Now I want to
> use it on a particular desktop to have a Windows 7 Guest on a native
> Linux system. Well this desktop has two Screens, and I'm sure its
> expected to have the Guest also on both screens.
> 
> Supposevly I could just simulate a very wide Screen and have the host
> split it (either SDL or VNC). However, this is not quite the same, as
> the guest will think exactly that, 1 wide screen. Meaning it will put
> all the messageboxes exactly in the middle between the two screens, have
> the startbar spawn on both screens and what not. So two screens are
> handled a tad differently than one wide.
> 
> Is this possible with kvm?
> Either simulate a dual head mapping to one wide SDL/VNC display. Or
> having two SDL/VNC displays?


No. It was brought up before on the qemu list I believe. I think the gist was 
that qemu didn't support more than one vga card.


> 
> Kind regards,
> Axel Kittenberger
> 
> 
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Re: Can I simulate a virtual Dual-Head Graphiccard?

[FinnTux]

>> Is this possible with kvm?
>> Either simulate a dual head mapping to one wide SDL/VNC display. Or
>> having two SDL/VNC displays?
>
>
> No. It was brought up before on the qemu list I believe. I think the gist was
> that qemu didn't support more than one vga card.
>

Spice (www.spice-space.org) can do this. I just tested it and works
well. Too bad spice isn't included in qemu-kvm yet.

Re: Can I simulate a virtual Dual-Head Graphiccard?

[Avi Kivity]

On 04/28/2010 11:08 PM, Axel Kittenberger wrote:
> Hello,
>
> This is a question I was not able to answer with a search. I've been 
> using kvm now quite successfully as server side solution. Now I want 
> to use it on a particular desktop to have a Windows 7 Guest on a 
> native Linux system. Well this desktop has two Screens, and I'm sure 
> its expected to have the Guest also on both screens.
>
> Supposevly I could just simulate a very wide Screen and have the host 
> split it (either SDL or VNC). However, this is not quite the same, as 
> the guest will think exactly that, 1 wide screen. Meaning it will put 
> all the messageboxes exactly in the middle between the two screens, 
> have the startbar spawn on both screens and what not. So two screens 
> are handled a tad differently than one wide.
>
> Is this possible with kvm?

The spice project supports multiple monitors, so when that is merged, 
you'll be able to use multiple displays.

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