Re: [Xen-devel] [RFC] arm/p2m: call iommu iotlb flush if iommu exists and enabled

[Andrii Anisov <andrii.anisov@xxxxxxxxx>]

Hello Paul,

On 23.01.19 13:45, Paul Durrant wrote:
> Yes, this was a mistake when moving from the old macros and need_iommu. Andrii 
> is correct that need_iommu_pt_sync() is supposed to gate whether an explicit 
> map/unmap is needed. The need for flush should only depend on has_iommu_pt().
So I fix the commit message and send V2 for XEN 4.12.

> There is also iommu_use_hap_pt() which is actually defined as has_iommu_pt(), 
> but I wonder whether that should just go away for ARM since the page tables are 
> always shared.
Actually, the mainline currently supports only SMMU, which does share the page 
table.
But it is not always true, we are using HW, where PT is not shared. And going 
to upstream that support one day.

--
Sincerely,
Andrii Anisov.

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