Hi,
I've added some preliminary support for VT-d for paravirtualized
guests. This must be enabled using an 'iommu_pv' boot parameter
(disabled by default).
I've added some python bindigs to allow xend to assign PCI devices to
IOMMU for PV guests. For HVM guests this is handled in ioemu. Not
sure if it makes sense to handle both cases in one place.
The changes currently hook into get_page_type() in xen/arch/x86/mm.c
to map/unmap IOMMU pages when the page types change. This might
not be the apropriate place to hook these calls.
The patches I've added are as follows:
 xen-vtd-unmap.patch --- Make the VT-d iommu_unmap_page() code
 actually do something close to useful.
 xen-ptab-dump.path --- There's no point in using 'current' when an
 IOMMU page fault is raised. Also, add some page type
 statistics for DomPage debug output.
 xen-iommu-pv.patch --- Add support for iommu_pv_enable boot
 parameter and IOMMU assignment of PCI devices to guests.
 xen-iommu-pv-mappings.patch --- Hook iommu_{un}map_page() calls
 into various Xen locations.
 xen-pv-assign.patch --- Allow PCI devices to be assigned to IOMMU
 PV guests from xend.
While adding the PV VT-d support I also noticed that there is a lot of
duplicated and unused code dealing with VT-d. This really needs to be
cleaned up properly. I don't know if the original VT-d submitters
already have made plans for doing this.
 eSk
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