[Xen-devel] RE: [RFC][PATCH] Basic support for page offline

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

Tim Deegan <mailto:Tim.Deegan@xxxxxxxxxx> wrote:
> At 14:37 +0000 on 19 Feb (1235054276), Jiang, Yunhong wrote:
>> 
>>>> It should be possible to have the tools do all the PTE manipulations
>>>> with MMU update hypercalls (I think -- Keir may correct me here). Then
>>>> the final hypercall to surrender the page will fail if the grant tables
>>>> are wrong; if it does, put the PTEs back and fall back to a live
>>>> migration.  Isn't that what your in-xen code does anyway?
>> 
>> Tim, after checking the code more carefully, seems currently
> the MMU update hypercalls (including mod_lx_entry ) assume it
> is for current domain, while in our usage model, it will
> update MMU for other domain, so I will try to do following
> changes: 1) change mod_lx_entry() to get a domain parameter 2)
> Add a new hypercall (or a new command to do_mmu_update ) to
> update the MMU for other domain. I'm not sure if there are
> other usage model for such requirement, and if such changes
> acceptable? Any feedback is welcome.
>> 
> 
> Sorry for the delay -- I was travelling around the summit and this got
> lost.  Yes, I think this is an OK approach.  I doubt there will be many
> other users of such a hypercall since most OSes will get upset by their
> PTEs changing under their feet, but I prefer it to the current patch.

Sure, I will do this way.

Thanks
Yunhong Jiang

> 
> Cheers,
> 
> Tim.
> 
> --
> Tim Deegan <Tim.Deegan@xxxxxxxxxx>
> Principal Software Engineer, Citrix Systems (R&D) Ltd.
> [Company #02300071, SL9 0DZ, UK.]
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