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

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 7/5/08 10:27, "Wei Wang2" <wei.wang2@xxxxxxx> 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. To prevent these
> sibling devices from being assigned to different domains, a successful
> device assignment requires all sibling devices are owned by  either
> pciback or the target domain. This is a trial patch with minor
> modifications in the common interface to handle this situation
> correctly.  VTD code has also been slightly touched please let me know
> if it breaks any VTD functionality. Thanks!

This patch seems to do more than you suggest, for example adding an extra
iommu hook into setup.c for dom0. Also it does get_domain_by_id() with no
corresponding put_domain(). And in fact you should be able to
rcu_lock_domain_by_id()/rcu_unlock_domain() instead which is faster.

 -- Keir



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