Re: [Xen-devel] [PATCH 2/2] xen/dom0: Add a dom0-iommu=none option

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

On Thu, Dec 20, 2018 at 11:40:52PM +0000, Andrew Cooper wrote:
> For development purposes, it is very convenient to boot Xen as a PVH guest,
> with an XTF PV or PVH "dom0".  The edit-compile-go cycle is a matter of
> seconds, and you can resonably insert printk() debugging in places which which
> would be completely infeasible when booting fully-fledged guests.
> 
> However, the PVH dom0 path insists on having a working IOMMU, which doesn't
> exist when virtualised as a PVH guest, and isn't necessary for XTF anyway.
> 
> Introduce a developer mode to skip the IOMMU requirement.

This looks very similar to the current 'passthrough' option, maybe it
would be enough to allow PVH dom0 to use the passthrough option
provided a warning is added to
arch_iommu_check_autotranslated_hwdom?

Thanks, Roger.

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