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Re: [Xen-users] Graphics Pass-Through and domU Memory

On Wed, 2012-02-15 at 17:19 +0100, Tobias Geiger wrote:
> Hi Nick,
> Is your Dom0 64bit? Is your Windows7-DomU 64bit?
> Do you create your DomU via xm or (better!) with xl?

dom0 is 64 bit and Windows 7 HVM is also 64 bit.  I used virt-manager
(libvirt) to create the domU - definitely not xl, but I'm not sure how
closely libvirt is associated with xm.

> How many CPUs do you give this DomU?

2 - physical machine has a total of 4 cores on a single chip (Intel Core

> Does your DomU work ok with <=3266, including GPU support? Or are there 
> problems even with fewer than 3266MB Ram?

Yes, domU graphics pass-through works with anything less than or equal
to 3266MB of RAM.  Anything greater than 3266 causes Windows to crash
with one of several BSODs.

> Sorry, i have no definite answer to your problem, but i recall similar 
> Problems 
> with xm-created HVM guests and 64/32bit mixes , especially with older Xen 
> Versions.

No worries, I appreciate any help at all tracking this issue down.  It's
very strange, and I'm sure is related to some combination of
interactions between memory, the VGA BIOS, and the graphics card driver
in the Windows HVM.  I'm hoping someone can help track it down on this
list - if not, I'll post to the devel list and see if anyone there has
anything I can try.


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