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Re: [Xen-users] ATI VGA Passthrough / Xen 4.2 / Linux 3.8.6

On 04/21/2013 09:43 PM, Andrew Bobulsky wrote:
Hello Gordon,

On Apr 21, 2013, at 1:22 PM, Gordan Bobic <gordan@xxxxxxxxxx> wrote:

Joy, more ATI crashes (atikmdag.sys), including:
"An attempt was made to write to read-only memory."

I'm starting to get a feeling that VGA passthrough support is not as stable as 
I might have hoped. :-/

It generally is, but I've had some fights with cards that aren't super new.

Radeon HD7450 is the most recent generation.

I was always able to get my 5850 to work until I installed gplpv,
which would give that BSOD. I'm told that's not an issue for anyone
these days, but I've only seen that on Windows 7 DomU's.

I tried XP64, too (XP64 is my preferred choice), but that fares even worse. Typically, that only works once, right after a clean install. Add the ATI card, boot up, install the driver, and it all works fine - until I shut down the VM. Thereafter it never works again.

Also, sometimes, FLR-related issues will give that BSOD.  You could
try detaching the card, attempt a good boot, reboot dom0, reattach and
boot DomU.

Having to reboot Dom0 completely defeats the purpose of what I'm trying to achieve. If I have to reboot the machine, I'll run Windows on bare metal and go 25%+ faster for it. I specifically wanted to avoid having to reboot the host, and was willing to live with the virtualization performance tax to achieve it.


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