[Xen-users] Re: Trouble enabling VT-D: "I/O virtualisation disabled"

[Christian Tramnitz <chris.ace@xxxxxxx>]

> I too have the same problems.   Using ASUS P6T and Debian Lenny.  I
> played around with it for weeks and just could not get it to work,
> here is my original post on the issue.
>
> http://www.nabble.com/ASUS-p6t,-i7-920,--vt-d-broken.....-td21624614.html
>
> I've given up for the moment......
Hi Steve,

I'm also having a problem with the Asus P6T, but since I'm using 
Xen-unstable I'm not sure if this is the same problem than you have.
Have a look at the "VT-D RMRR is incorrect" thread initially started by 
Yoshiharo Mori:
It looks like the ACPI-DMAR tables are broken on some (Supermicro, Asus) 
X58 boards.
This is a problem for Xen-unstable, disabling VT-d.

I already opened a case with Asus but they are telling me that Linux is 
not officially supported. I'll continue to chase them as VT-d is (at 
least in theory) platform independent but it might help if others also 
open cases about this!
Unfortunately I can't go back to Xen-stable for now to test if this is 
the same issue as I'm running on a paravirt_ops kernel that requires 
Xen-unstable (or at least heavy patching for 3.3).
Btw, just looked at your other post again, the iommu=1 needs to go on 
the xen line and the pciback stuff on the line together with the linux 
kernel... and again, VMX (aka VT) has nothing to do with VT-d...
Best regards,
   Christian


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