Re: [Xen-devel] [PATCH] AMD IOMMU: Hanlde sibling device assignment correctly

[Wei Wang2 <wei.wang2@xxxxxxx>]

On Wed, 2008-05-07 at 12:53 +0300, Muli Ben-Yehuda wrote:
> On Wed, May 07, 2008 at 11:27:01AM +0200, Wei Wang2 wrote:
> 
> > Devices on AMD IOMMU system share a same set of IO page tables if
> > they are indexed by a same device ID in device table.
> 
> Hi Wei,
> 
> Could you please explain in which cases two devices would end up
> sharing the same device ID? Am I correct in the assumption that this
> can only happen for devices on the HT fabric, rather than for
> PCI/PCI-e devices?
I think both could be possible. If IOMMU is implemented per PCI-to-PCI-E
bridge, then probably there will be a group of PCI device sharing a same
PCI-E requester ID. The device table can only be indexed by either PCI-E
requester ID or HT unit ID.

Wei


> Thanks,
> Muli
> 
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