Re: [Xen-devel] Re: [PATCH] Support swap a page from user spacetools -- Was RE: [RFC][PATCH] Basic support for page offline

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 20/03/2009 09:59, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:

>>>> Since the guest is suspended, would that matter? Any I/Os that were in
>>>> flight on suspend will get resubmitted on resume. So the potential races
>>>> might all be benign.
>>> 
>>> I think it may not be resubmited. Backend may have no idea at all if the
>>> guest is resume quickly, I remember. Or maybe I miss understand the
>>> interface between backend/frontend..
>> 
>> Ah, you do a suspend-cancel/fast-resume?
> 
> Yes, that's suggested by Tim and I think that's meet our purpose quite well.

Okay, then I suggest you extend XENMEM_exchange so that in.mem_flags can
tell that hypercall to copy data from old to new pages. XENMEMF_copy_data?

 -- Keir



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