Re: [Xen-devel] [RFC PATCH 68/84] page_alloc: actually do the mapping and unmapping on xenheap.

[<hongyax@xxxxxxxxxx>]

On 26/09/2019 11:45, Julien Grall wrote:
> Hi,
>
> I forgot to mention one thing. Can you explain why you are using 
> map_pages_to_xen and not destroy_xen_mappings here?
>  From my understanding, the former will not teardown intermediate pagetables. 
> If this is what you want then please write it down in a comment. Note that Arm 
> does not support _PAGE_NONE so something similar to implementation of vunmap 
> would be necessary.
That is exactly my intention. Without an always-mapped direct map, mappings to 
the DIRECTMAP region are created/destroyed alongside xenheap 
allocations/deallocations. Performance-wise it probably makes less sense to 
actually tear down all pagetables and later allocate them again.
I can add a comment.

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