Re: [Xen-devel] [PATCH v5 3/6] x86 / pv: do not treat PGC_extra pages as RAM

[Jan Beulich <jbeulich@xxxxxxxx>]

On 10.03.2020 16:05, Paul Durrant wrote:
>> -----Original Message-----
>> From: Jan Beulich <jbeulich@xxxxxxxx>
>> Sent: 10 March 2020 14:59
>>
>> In reply to patch 6 I did suggest to
>> have a separate list, but without taking these pages off
>> d->page_list,
> 
> How would that work without adding an extra page_list_entry into struct 
> page_info?

As said there, it'd be a singly linked list using a __pdx_t
field just like there already is with "next_shadow", i.e.
you'd add another union member "next_extra" or some such. Of
course the list shouldn't grow too long, or else insertion
and removal may become a bottleneck. Not sure how well this
would fit Arm, though; maybe they wouldn't need this, but
that depends on whether the list would be used for purposes
beyond dumping.

Jan

>> such that here you would skip them in the main
>> domain page dumping loop, but you would then traverse that second
>> list and dump all of its elements, just like xenpage_list gets
>> handled there.
>>
> 
> Well, that's what I'm trying to achieve, yes.
> 
>   Paul
> 


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