Re: [Xen-devel] [PATCH v2] x86/mm: Clean IOMMU flags from p2m-pt code

[Jan Beulich <JBeulich@xxxxxxxx>]

On 03.07.2019 14:50, Alexandru Stefan ISAILA wrote:
> At this moment IOMMU pt sharing is disabled by commit [1].
> 
> This patch aims to clear the IOMMU hap share support as it will not be
> used in the future. By doing this the IOMMU bits used in pte[52:58] can
> be used in other ways.
> 
> [1] c2ba3db31ef2d9f1e40e7b6c16cf3be3d671d555

This all makes it sound as if this was generally the case, but it's
so only on the AMD side. On VT-d / VT-x page table sharing continues
to work. But it may be just me that I'd prefer this to not be implied
from the mention of p2m-pt in the title, so I'll leave it to George
as the maintainer to decide whether a further change to the
description is needed.

And then I would of course have wished that a cleanup patch like this
one dealt with both sides, i.e. removed pt sharing remains from
xen/drivers/passthrough/amd/ at the same time (i.e. if not in one
patch, then at least in the same series). But this may again be just
me ...

Jan
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