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

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 20/03/2009 09:44, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:

> Yes, seems this method works well. The only change to Xen is to enhance
> current mmu_xxx_pt_update to support foreign page table.
> 
> I will update the patch accordingly to see if it can pass the review  :-)

Yay! Good news.

The only question, then, is whether we think the races against backends are
benign or not. Since the guest is suspended (in the ready-for-save-restore
meaning of suspended, right?) I think you get away with it. If actually
there are dangerous races we may need Xen support for this operation yet.
But if the guest is really suspended this is no more dangerous than the
stop-and-copy phase of a domain save or live migration, I would say. And
that obviously works!

 -- Keir



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