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Re: [Xen-devel] [PATCH v5 2/7] x86: introduce a new set of APIs to manage Xen page tables
- To: "Xia, Hongyan" <hongyxia@xxxxxxxxxx>, "George.Dunlap@xxxxxxxxxxxxx" <George.Dunlap@xxxxxxxxxxxxx>, "jbeulich@xxxxxxxx" <jbeulich@xxxxxxxx>, "roger.pau@xxxxxxxxxx" <roger.pau@xxxxxxxxxx>, "wl@xxxxxxx" <wl@xxxxxxx>, "andrew.cooper3@xxxxxxxxxx" <andrew.cooper3@xxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Mon, 27 Jan 2020 17:13:14 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "Grall, Julien" <jgrall@xxxxxxxxxx>
- Delivery-date: Mon, 27 Jan 2020 17:13:27 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 1/27/20 3:07 PM, Xia, Hongyan wrote:
> On Mon, 2020-01-27 at 15:43 +0100, Jan Beulich wrote:
>> On 27.01.2020 15:33, Xia, Hongyan wrote:
>>> ...
>>>
>>> Reflecting back to your comment in v3 about whether the new Xen
>>> page
>>> table mapping APIs (map/unmap_xen_pagetable) are really necessary,
>>> I
>>> agree in the end they will just do the same thing as
>>> map/unmap_domain_page, although one thing is that the latter
>>> suggests
>>> it is trying to map a `domain' page, whose definition probably does
>>> not
>>> include Xen page tables, so the name could be a bit confusing
>>> (well, we
>>> could argue that Xen page tables are just idle `domain' pages so
>>> the
>>> name still holds). If we are happy with using map_domain_page on
>>> Xen
>>> PTE tables then I am okay with dropping the new mapping APIs and
>>> only
>>> include the new alloc APIs.
>>
>> Anyone on the To: list - opinions?
>
> There is one argument. We already use map_domain_page on non-domain
> pages and outside the domheap. For example, the trap handler walks page
> tables and print traces via map_domain_page regardless of where the
> underlying page is from. The mapped page could just be from Xen.
Yes, I've long sort of mentally filtered out the 'domain' part of
"map_domain_page()"; it's really an artifact of a bygone era, when there
were separate xen and domain heaps. (In fact, it's really "map domheap
page", and at the moment we only have a domheap.)
It might be worth thinking about doing a global
s/map_domain_page/map_page/; but until then, I think it's fine to use
"map_domain_page" for "map pages in the domheap", given that there *is*
only the domheap.
-George
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