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>]

Or when page is mapped by other domain.


xen-devel-bounces@xxxxxxxxxxxxxxxxxxx <> wrote:
> 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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