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

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Roger Pau Monne [mailto:roger.pau@xxxxxxxxxx]
> Sent: Thursday, August 17, 2017 5:32 PM
> 
> 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.
>  

Possibly you need a better description here. otherwise current
description has nothing to do with inclusive mapping, based on
which it looks a basic PVH dom0 problem (while from your 
explanation it's not valid today).

Thanks
Kevin

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