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Re: [Xen-devel] [PATCH 2/2] domain: use PGC_extra domheap page for shared_info
- To: Paul Durrant <pdurrant@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 26 Feb 2020 11:46:07 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Wed, 26 Feb 2020 11:46:20 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 25/02/2020 09:53, Paul Durrant wrote:
> There's no particular reason shared_info need use a xenheap page.
?
There are a number of ABI-critical reasons, not least the evtchn_pending
field which Xen needs to write.
I can see what you're trying to do, and it looks fine in principle, but
the commit message isn't remotely accurate. Remember that you are in
the process of changing the meaning/usage of the xenheap - preexiting
uses conform to the old meaning, where the sole distinction between
domheap and xenheap pages was whether Xen required a virtual mapping or
not. The answer is "absolutely yes" for the shared info page.
~Andrew
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