Re: [Xen-devel] [PATCH 3/3] xen: expose that grant table mappings update the IOMMU

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-04-08 at 11:05 +0100, Jan Beulich wrote:
> >>> On 08.04.14 at 11:57, <Ian.Campbell@xxxxxxxxxx> wrote:
> > Again, PVH dom0 is my concern here. By default you would expect dom0 to
> > get given almost everything in the platform, including things which you
> > might not normally pass through to a guest.
> 
> I think all we can do is say such devices (if any exist at all) may not
> work with PVH Dom0. I don't see us accepting a 1:1 hack for x86 like
> you put in place for ARM, 

That's fair enough for x86 I think.

> and I take it that you need this hack only
> because it's essential devices that may come in this form.

That's right, sometimes it is NICs etc.

Plus we want dom0 to be able to run on systems with no IOMMU at all. I
think PVH is predicated on there being an IOMMU in the system.

Ian.


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