Re: [Xen-devel] [PATCH RFC 2/2] x86/mm: PG_translate implies PG_refcounts

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 24/08/17 11:07, Wei Liu wrote:
> On Thu, Aug 24, 2017 at 11:05:36AM +0100, Wei Liu wrote:
>> On Thu, Aug 24, 2017 at 11:02:33AM +0100, Tim Deegan wrote:
>>> At 16:58 +0100 on 23 Aug (1503507504), Wei Liu wrote:
>>>> After 404595352 ("x86/paging: Enforce PG_external == PG_translate ==
>>>> PG_refcounts"), PG_refcounts and PG_translate always need to be set
>>>> together.
>>>>
>>>> Squash PG_refcounts to simplify code. All calls paging_mode_refcounts
>>>> are replaced by calls to paging_mode_translate.
>>> Would it be a good idea to merge all three and have only PG_external?
>>>
>> My reverse-engineering is that when PV guest is migrated it has
>> PG_external and (the new) PG_translate.
> Sorry, I meant (!PG_external && PG_translate)

PV guests migrating should get logdirty and none of
PG_external|PG_translate|PG_refcounts

~Andrew

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