Re: [Xen-devel] [PATCH 2/2] domain: use PGC_extra domheap page for shared_info

[Jan Beulich <jbeulich@xxxxxxxx>]

On 26.02.2020 15:05, Durrant, Paul wrote:
>> From: Jan Beulich <jbeulich@xxxxxxxx>
>> Sent: 26 February 2020 13:58
>>
>> On 25.02.2020 10:53, Paul Durrant wrote:
>>> There's no particular reason shared_info need use a xenheap page. It's
>>> only purpose is to be mapped by the guest so use a PGC_extra domheap
>> page
>>> instead.
>>
>> Since the cover letter also doesn't give any background - is there a
>> problem with the current arrangements? Are there any further plans
>> depending on this being changed? Or is this simply "let's do it
>> because now we can"?
>>
> 
> The general direction is to get rid of shared xenheap pages. Knowing
> that a xenheap page is not shared with a guest makes dealing with
> live update much easier,

I may not be seeing enough of the overall picture, but it would seem
to me that the special treatment of shared Xen heap pages would then
be replaced by special treatment of PGC_extra ones.

Jan

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