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Re: [Xen-devel] [PATCH RFC v2] Add SUPPORT.md



On 09/12/2017 08:52 PM, Stefano Stabellini wrote:
>>> +### Xen Framebuffer
>>> +
>>> +    Status, Linux: Supported
>>
>> Frontend?
> 
> Yes, please. If you write "Xen Framebuffer" I only take it to mean the
> protocol as should be documented somewhere under docs/. Then I read
> Linux, and I don't understand what you mean. Then I read QEMU and I have
> to guess you are talking about the backend?

Well this was in the "backend" section, so it was just completely wrong.
 I've removed it. :-)


>>> +### ARM: 16K and 64K pages in guests
>>> +
>>> +    Status: Supported, with caveats
>>> +
>>> +No support for QEMU backends in a 16K or 64K domain.
>>
>> Needs to be merged with the "1GB/2MB super page support"?
>  
> Super-pages are different from page granularity. 1GB and 2MB pages are
> based on the same 4K page granularity, while 512MB pages are based on
> 64K granularity. Does it make sense?

It does -- wondering what the best way to describe this concisely is.
Would it make sense to say "L2 and L3 superpages", and then explain in
the comment that for 4k page granularity that's 2MiB and 1GiB, and for
64k granularity it's 512MiB?

> Maybe we want to say "ARM: 16K and 64K page granularity in guest" to
> clarify.

Clarifying that this is "page granularity" would be helpful.

If we had a document describing this in more detail we could point to
that also might be useful.

 -George

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