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Re: [Xen-devel] Fwd: Re: Xen 4.3 / 4.4 - concurrent APIs, VGA Passthru

On 08/03/2014 02:09 AM, Georg Bege wrote:

I tried your suggestions now with Xen 4.3.2-r4 (Gentoo).
On Win7 64bit its not working at all, I cannot passthru the GFX -
I rolled back to a snapshot where I installed everything but not the
nvidia package.

Just to clarify - which suggestion is that?

So I tried it and it works out, reboots and then I get a message like:
"This device reported an error and had to be stopped, code 43."
within the device manager.
This happens whether Im trying the DomU with 8GB or 1024MB - same results.
On Xen 4.4 I can passthru the GFX, no problem but its very slow (as I've
written already).

Have you tried an older Nvidia driver? I'm running the latest 331.x driver on both XP and Win7 (both x64).

The slowness might be indicative of an interrupt related problem. The boot parameters I'm running with are as follows:

xen.gz: dom0_vcpus_pin iommu=dom0-passthrough unrestricted_guest=1 msi=1
vmlinuz: intel_iommu=on pcie_aspm=off pcie_ports=compat

Note: The pcie_aspm=off pcie_ports=compat are to work around a bug on my motherboard that causes a massive interrupt flood due to a device on ICH10 flapping between hotplug states and creating an interrupt storm that makes the entire machine permanently unusable as soon as the kernel starts probing devices. You probably don't need those two options but they shouldn't do any harm while you're troubleshooting.


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