Re: [Xen-users] PVH dom0 creation fails - the system freezes

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

On Mon, Jul 23, 2018 at 07:04:52PM +0200, Manfred Haertel, DB3HM wrote:
> Roger Pau Monné schrieb:
> 
> > > Any reason why you are trying to use an iommu? I'd start with the simple
> > > case without iommu.
> > 
> > The IOMMU is a hard requirement for PVH Dom0.
> 
> Why?

Because a PVH Dom0 runs in autotranslated mode (using hardware
assisted paging), and thus the Dom0 kernel is going to use guest
physical addresses in order to interact with devices. The IOMMU is
required so that the devices also have such assisted paging and write
to the translated guest physical addresses.

Roger.

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