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Re: [Xen-devel] [PATCH] x86/iommu: remove usage of {set/clear}_identity_p2m_entry against PV domains

On Thu, Dec 05, 2019 at 12:24:29PM +0100, Jan Beulich wrote:
> On 02.08.2019 11:22, Roger Pau Monne wrote:
> > Switch rmrr_identity_mapping to use iommu_{un}map in order to
> > establish RMRR mappings for PV domains, like it's done in
> > arch_iommu_hwdom_init. This solves the issue of a PV hardware domain
> > not getting RMRR mappings because {set/clear}_identity_p2m_entry was
> > not properly updating the iommu page tables.
> Aiui we still didn't get to the bottom of this. Together with
> my (much) earlier reply I think I'll drop this from my list
> of pending patches, unless you indicate otherwise.

Yes, IIRC Roman said this was likely caused by a firmware issue?

There was an issue as a result of other IOMMU changes and the code
that was already fixed by a different patch, I think this can be
safely dropped.

Thanks, Roger.

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