Re: [Xen-users] [Xen-devel] Is my Intel HD Graphics 4600 Xen VGA Passthrough to Windows 8 Enterprise HVM domU Considered Successful?

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Fri, 19 Jul 2013 19:37:16 +0800, "Singapore Citizen Mr. Teo En Ming 
(Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > > > > > > My Windows 8 Enterprise HVM domU configuration is as follows. I 
> > > > > > > have
> > > > > > > to *disable* gfx_passthru, that is, gfx_passthru=0. Please take 
> > > > > > > note.
> > > > > > [...]
> > > > > >
> > > > > > > So is my Intel HD Graphics 4600 Xen VGA passthrough to Windows 
> > > > > > > 8
> > > > > > > Enterprise HVM domU considered successful?
> > > > > > If it works, it's successful.
> > > > > >
> > > > > > > I cannot enable gfx_passthru, that is, gfx_passthru=1. If I 
> > > > > > > enable
> > > > > > > gfx_passthru, Windows 8 Enterprise HVM domU would start for a 
> > > > > > > few
> > > > > > > seconds, then the LCD monitor would go into power save mode 
> > > > > > > (blank
> > > > > > > screen) *forever*.
> > > > > > >
> > > > > > > Please advise me on how I can get VGA passthrough to work with
> > > > > > > gfx_passthru=1.
> > > > > > Can you elaborate why exactly do you need to have that GPU 
> > > > > > passed
> > > > > > through as primary? Primary GPU passthrough has always been
> > > > > > problematic because domU has to re-post the card's BIOS which
> > > > > > has always been problematic.
> > > > > >
> > > > > > The only difference in the general case is that with 
> > > > > > gfx_passthru=1
> > > > > > you get to see the POST and boot information on the monitor
> > > > > > connected to the GPU. With gfx_passthry=0 you can only see this
> > > > > > in the VNC session connected to the virtual primary VGA card. In
> > > > > > the vast majority of cases seeing the POST and boot animation
> > > > > > isn't useful enough to be worth bothering with.
> > > > > >
> > > > > > I have a working setup with 2x Quadro cards, each passed through
> > > > > > as secondary (gfx_passthru=0) to different domUs, with separate
> > > > > > mice/keyboards passed through to each domU (multi-seat gaming
> > > > > > rig), and that works lovely (only limitation being 2GB of RAM
> > > > > > for each domU until I get around to upgrading to 4.3).
> > > > > >
> > > > > > Unless you have a very compelling reason to use gfx_passthru=1
> > > > > > I suggest you don't bother even trying.
> > > > > >
> > > > > > Gordan
> > > > > Dear Gordan,
> > > > >
> > > > > I want to use the monitor connected to Intel HD Graphics 4600
> > > > > directly. I don't want to use a VNC session to connect to the 
> > > > > Windows
> > > > > 8 Enterprise HVM domU.
> > > > >
> > > > > Thank you very much.
> > > > You only need VNC for the POST. Once Windows boots up you should 
> > > > be
> > > > be able to get all your display output on the physical screen.
> > > > Disable the virtual VGA interface in device manager if you have
> > > > to - I've found that is sometimes necessary to get the physical
> > > > GPU working properly.
> > > >
> > > > Gordan
> > > Dear Gordan,
> > >
> > > How do I disable the virtual display adapter in Windows 8 
> > > Enterprise
> > > HVM domU? I see nothing on the physical screen at all.
> > Have you tried going into your desktop/resolution settings and
> > extending your desktop to the physical monitor?
> How do I do that? What are the steps? Please elaborate. Please show
> me any screenshots, if any.
Sorry, that's a Windows question and that is outside of my area of
expertise.

Gordan

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