Re: [Xen-API] PCI passthrough - XCP vs XenServer

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sun, Jun 30, 2013 at 12:04:19PM -0400, gizmochicken wrote:
> > That is not entirely true, since xenserver 6.2 still uses Xen 4.1 but is
> > updated to 4.1.5, which indeed is more restrictive/bug free when it comes to
> > pci passthrough.
> 
> I stand corrected with regard to the version of Xen employed by
> XenServer 6.2.  But in any case, I'd welcome a configurable option
> that would allow me to add back a "bug" that would allow me to use PCI
> passthrough with XenServer 6.2 on my Asus M5A99FX Pro 2.0 in the way
> that I could use it with XCP 1.6.
> 
> Is there any way to dial back XenServer 6.2's more strict requirement
> for an error free IVRS table?
> 

Are you hitting the Intel Errata that causes Xen to disable IOMMU ? 
If yes, you can pass "iommu=no-intremap,verbose" option to Xen hypervisor.

See the Xen dmesg for more information about IOMMU status.

-- Pasi


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