RE: [Xen-devel] [RFC] Nested Paging Live Migration

["Huang2, Wei" <Wei.Huang2@xxxxxxx>]

Retry.

All common functions were extracted to paging level. Plus,
p2m_set_flags_global() does NOT rely on set_p2m_entry() anymore. 

Live_migrate_patch_all.txt is the complete patch. To make it clear, I
further splitted it into two small ones (1:
live_migrate_interface_patch.txt, 2: live_migrate_npt_patch.txt).

Please comment. Thanks.

-Wei

Tim Deegan wrote:
> Hi,
> 
> At 23:29 -0500 on 05 Jun (1181086164), Wei Huang wrote:
>> 2. shadow/hap_log_dirty_enable() and shadow/hap_log_dirty_disable()
>> These four functions were not changed. However, I really want to
>> create two common functions (paging_log_dirty_disable() and
>> paging_log_dirty_enable()) for them. To do this, it requires two
>> function pointers (*log_dirty_enable() and *log_dirty_disable()),
>> which point to shadow-specific code or hap-specific code. For
>> example, *log_dirty_enable() points to shadow_log_dirty_enable().
>> 
>> Tim, let me know if you like this approach.
> 
> Yep, that seems fine.
> 
>> 3. p2m_set_l1e_flags() is renamed to p2m_set_flags_global() as
>> requested. It does NOT walk P2M. Instead, it still relies on
>> set_p2m_entry() to walk P2M table.
>> 
>> The reason: I feel uncomfortable to duplicate the code of
>> set_p2m_entry() in this method. Most of them will be same as
>> set_p2m_entry() and p2m_next_level(). What is your opinion?
> 
> I think it'd be fairly easy to do with a few nested loops since it
> doesn't need to care about contents or changing the shape of the
> tree, or have to handle different PT layouts at run-time.  
> 
> I was worried about the cost of reading the struct page-info and the
> m2p and doing _two_ traverses of the p2m for every frame in the
> domain; but I don't suppose that enabling log-dirty mode is too
> time-critical an operation. :)   
> 
> Cheers,
> 
> Tim.

Attachment: live_migrate_patch_all.txt
Description: live_migrate_patch_all.txt

Attachment: live_migrate_interface_patch.txt
Description: live_migrate_interface_patch.txt

Attachment: live_migrate_npt_patch.txt
Description: live_migrate_npt_patch.txt

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