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Re: [PATCH V2 0/6] populate/unpopulate memory when domain on static
- To: Penny Zheng <Penny.Zheng@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 19 Apr 2022 10:46:36 +0200
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- Cc: wei.chen@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 19 Apr 2022 08:46:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.04.2022 14:22, Penny Zheng wrote:
> Today when a domain unpopulates the memory on runtime, they will always
> hand the memory over to the heap allocator. And it will be a problem if it
> is a static domain. Pages as guest RAM for static domain shall always be
> reserved to only this domain and not be used for any other purposes, so
> they shall never go back to heap allocator.
>
> This patch serie intends to fix this issue, by adding pages on the new list
> resv_page_list after having taken them off the "normal" list, when
> unpopulating
> memory, and retrieving pages from resv page list(resv_page_list) when
> populating memory.
>
> ---
> v2 changes:
> - let "flags" live in the struct domain. So other arch can take
> advantage of it in the future
> - change name from "is_domain_on_static_allocation" to "is_domain_static()"
I have reservations against this new name: This could mean far more aspects
of the domain are static than just its memory assignment. Was this intended
(or at least considered)?
Jan
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