[Xen-users] VGA Passthrough on laptop IGD

["p.q.b." <throwout@xxxxxxxxxxxxxx>]

Hi,

 I'm new to XEN and I'm starting my search for a VT-d enabled laptop.
Just for my personal curiousness, I'd want to try Qubes-os but I'd also 
appreciate a Windows HVM guest in which could watch my fullHD 
videos/youtube and so on, with full hardware acceleration.
I know XEN is continuosly improving, but I found a lot of outdated 
documentation and I'm not sure if VGA passthrough is possible or not on 
a laptop with only the integrated GPU (haswell, i3-4010u processor).
http://wiki.xen.org/wiki/Xen_VGA_Passthrough states "Status for Xen 
4.0.0: VGA passthru is known to work with Intel Integrated Graphics 
Devices (IGDs)"
Yeah, I'm happy! But...Xen 4.0.0 has been released on 2010, right? So, 
if the IGD passthrough is a feature of xen 4.0.0, after 5 years I 
shouldn't encounter any problems to use it! Everything will work for 
sure!
So, why on the net there are people telling that vga passthrough is 
possible only with a second vga (ATI or nvidia quadro) ????? I do not 
understand why many people is telling that with a single IGD is tricky 
and is better to give it up?  Is there something that I do not know? I 
have no problems to recompile a kernel or build a headless system, so 
why passing through the primary (and only) vga should be a problem?
Moreover I can't understang why many people says to use an ATI 
gpu...?!?! Is it  different between xen/qemu/vmware maybe?
Anyway, my choice should be the Lenovo Yoga 2 13", it has an i3-4010u. 
Anyone tried it?
Many thanks
p.q.b.

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