Re: [Xen-devel] Xen 4.2.1 boot failure with IOMMU enabled

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 02/15/2013 03:21 AM, Jan Beulich wrote:
> But I don't think we can easily deal with the single IOMMU
> case, making that IOMMU cover all devices, as we would
> still need to figure out the requestor ID for each device. That
> requires looking at the PCI bus topology iiuc, and while we
> have the necessary logic for VT-d, it seems not really strait
> forward (mainly because risky) to make use of this in the AMD Vi
> code too.
Scanning PCI for devices would effectively mean that we are ignoring 
IVHD (device portion of IVRS). That would be somewhat unfortunate (but 
maybe unavoidable, given the state of BIOSes).

-boris

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