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

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

>> 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.

Thanks
Yunhong Jiang
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