Re: [Xen-devel] [PATCH RFC 4/4] x86/dom0: re-order DMA remapping enabling for PVH Dom0

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> Roger Pau Monne <roger.pau@xxxxxxxxxx> 04/24/17 1:52 PM >>>
>Make sure the reserved regions are setup before enabling the DMA remapping in
>the IOMMU, by calling dom0_setup_permissions before iommu_hwdom_init. Also, in
>order to workaround IOMMU issues seen on pre-Haswell Intel hardware, make sure
>the DMA remapping is enabled after populating Dom0 p2m.

Looks reasonable (especially considering that iommu_hwdom_init() is being called
fairly late in the PV case as well), but please explain the "IOMMU issues seen 
on
pre-Haswell Intel hardware" a little here (or if it all is mean to refer to 
what patch 3
does, refer to it).

Jan


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