On Mon, Jun 8, 2015 at 7:24 PM, Frediano Ziglio <fziglio@xxxxxxxxxx> 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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