Re: [Xen-devel] [PATCH v2 4/4] x86/mm/p2m: stop checking for IOMMU shared page tables in mmio_order()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.12.18 at 18:40, <paul.durrant@xxxxxxxxxx> wrote:
> Now that the iommu_map() and iommu_unmap() operations take an order
> parameter and elide flushing there's no strong reason why modifying MMIO
> ranges in the p2m should be restricted to a 4k granularity simply because
> the IOMMU is enabled but shared page tables are not in operation.

I'm afraid the two improvements are not enough for this restriction
to be lifted: There's still no preemption in the processing of the
higher order values.

Jan



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