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Re: [RFC PATCH] xen/memory: Introduce a hypercall to provide unallocated space
- To: Oleksandr <olekstysh@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 5 Aug 2021 07:58:29 +0200
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- Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Wei Chen <Wei.Chen@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Julien Grall <julien@xxxxxxx>
- Delivery-date: Thu, 05 Aug 2021 05:58:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.08.2021 21:18, Oleksandr wrote:
> On 03.08.21 15:53, Jan Beulich wrote:
>> On 30.07.2021 18:13, Oleksandr wrote:
>>> - Where that range should be located in guest address space, should that
>>> range be the same for all domains (how GUEST_GNTTAB_BASE(SIZE) for example)
>>> or it should be calculated based on actual guest_ram_base(size) for a
>>> particular domain?
>> The default size may well be fixed or amount-of-memory-dependent, but
>> I think there will need to be a way to enlarge the region for guests
>> with particular needs.
> Well, but why we couldn't just make a large chunk by default which would
> satisfy all guests, as it was mentioned earlier in this thread "as it
> doesn't consume resource when not being used"
> to avoid an extra configuration option, etc?
Because experience tells me that no static upper limit will ever please
everyone.
Jan
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