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 10:03, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote:

>>> 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?

Even this may not work. Old grants will reference the old page. Subsequent
attempts by a backend to map the grant will fail. And the resulting failed
I/Os will probably make the frontend driver throw a fit. Getting this
working with suspend-cancel seems pretty tricky.

 -- Keir



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