Re: [Xen-devel] [PATCH] RFC: initial libxl support for xenpaging

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Mon, Feb 20, 2012 at 3:19 PM, Olaf Hering <olaf@xxxxxxxxx> wrote:
> On Mon, Feb 20, George Dunlap wrote:
>
>> Olaf, what do you do right now for booting a guest in paging mode with
>> memory < maxmem?
>
> xenpaging exits because XEN_DOMCTL_MEM_EVENT_OP_PAGING_ENABLE returns
> -EXDEV when PoD is detected.

OK.  So we have two options, as I see it, if someone starts a guest
with both xenpaging=yes and memory<maxmem:

* Refuse to build the domain and return an error.
* Figure out how to boot with memory<maxmem only with the pager.  I
guess this would involve building with half the memory, and telling
the pager that some pages are pre-paged out...?

If the second option is too much work before the release, we should go
with the first option.

 -George

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