Re: [Xen-devel] [PATCH v2 1/4] x86/dom0: prevent access to MMCFG areas for PVH Dom0

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

On Thu, Aug 17, 2017 at 03:12:02AM +0000, Tian, Kevin wrote:
> > From: Roger Pau Monne
> > Sent: Saturday, August 12, 2017 12:43 AM
> > 
> > They are emulated by Xen, so they must not be mapped into Dom0 p2m.
> > Introduce a helper function to add the MMCFG areas to the list of
> > denied iomem regions for PVH Dom0.
> > 
> > Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> 
> this patch is a general fix, not just for inclusive mapping. please send
> it separately.

Hm, not really.

PV Dom0 should have access to the MMCFG areas, PVH Dom0 shouldn't
because they will emulated by Xen.

So far MMCFG areas are not mapped into PVH Dom0 p2m, but they will be
once iommu_inclusive_mapping is implemented for PVH Dom0. So I
consider this a preparatory change before enabling
iommu_inclusive_mapping for PVH, rather than a fix. It would be a
fix if iommu_inclusive_mapping was already enabled for PVH Dom0.

Roger.

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