[Spice-devel] [PATCH] Allow Qemu to pass maximum head to guest

[Frediano Ziglio]

Decided to drop these changes as new ones are much better. 

Frediano 

----- Original Message -----

> From: "Marc-André Lureau" <marcandre.lureau at gmail.com>
> To: "Frediano Ziglio" <fziglio at redhat.com>
> Cc: "spice-devel" <spice-devel at lists.freedesktop.org>
> Sent: Monday, June 8, 2015 6:44:50 PM
> Subject: Re: [Spice-devel] [PATCH] Allow Qemu to pass maximum head to guest

> On Mon, Jun 8, 2015 at 7:24 PM, Frediano Ziglio < fziglio at redhat.com > wrote:

> > Hi,
> 
> > the idea behind this is to be able from libvirt to set the number of heads.
> 
> > Other cards (like vmware) support this "heads" setting.
> 
> > Actually is expected to work with QXL using Windows guest as in this
> > configuration every libvirt head will have a separate video card in the
> > guest.
> 
> > QXL/Linux depends on configurations. Userspace driver uses min(16, X
> > setting
> > default 4) while kernel will use a parameter (by defaults 4). I have
> > patches
> > for both userspace driver and kms/drm.
> 
> > It's quite hard to pass this limit from libvirt (you have also to consider
> > changing configuration after installation) for all guests. Actually there
> > is
> > no way for Qemu to enforce this limit (so yes, is an hint).
> 
> > This change is a bit different from previous ones as instead of requiring a
> > pci revision boost to add a field just use a flag. I tested and is back
> > compatible.
> 

> ok, that looks reasonable to me, looking forward for the rest of the patches

> --
> Marc-André Lureau
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