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

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

xen-devel-bounces@xxxxxxxxxxxxxxxxxxx <> wrote:
> On 19/03/2009 14:26, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:
> 
>>> Well, why is the existing hypercall not okay by itself? Why can you not
>>> take an arbitrary new mfn and you feel you have to specify it from the
>>> tools instead?
>> 
>> It is ok for us to use an arbitrary new mfn, and then do the update_entry.
>> But what happen if this process failed and we want to turn back to the old
>> page? We still need this mechanism at that situation.
> 
> If what failed? The update_entry? How could that happen?

Per discussion before, when the page is granted to other domain, then after we 
update all entry, there will still have reference to left.

-- yhj

> 
> -- Keir
> 
> 
> 
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