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

[Jan Beulich <jbeulich@xxxxxxxx>]

On 06.03.2020 13:57, David Woodhouse wrote:
> On Fri, 2020-03-06 at 13:36 +0100, Jan Beulich wrote:
>> And of course this means you're intending to (at least
>> partially) resurrect the distinction between domheap and xenheap,
>> which isn't said anywhere in Paul's series, I don't think.
> 
> Right. Secret hiding makes the distinction (xenheap is mapped, domheap
> is not) mostly go away. We are talking about restoring *a* distinction
> between one type of page (Xen ephemeral pages which don't need to be
> preserved over live update) and another (must be preserved), but
> whether that should still be called "xenheap" vs. "domheap", despite
> the massive parallels, isn't entirely clear.
> 
>>  If this
>> is a sufficiently correct understanding of mine, then on one hand
>> I start seeing the point of the conversion Paul wants to make, but
>> otoh this then feels a little like making the 2nd step before the
>> 1st.
> 
> 
> What would you suggest is the first step?

Establishing of what the new separation rule and mechanism is going
to be (no matter how the two resulting pieces are going to be
named).

Jan

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