[Xen-devel][PATCH] don't split the whole large page while live migration with EPT

["Xin, Xiaohui" <xiaohui.xin@xxxxxxxxx>]

Before, when HVM guest live migration with EPT, we just write protect all the EPT leaf entries.

Then we know the dirty pages through ept_handle_violation(), and call p2m_change_type()

to put back the write access of the EPT entries. At that time when we use large pages,

we used to split the large page to 4K.

It’s not necessary. Alternatively, we can just retain the large page entries,

and put back the write access and mark dirty all the small pages in the large page.

 

The patch attached removes the splitting.

 

Signed-off-by: Xin, Xiaohui <Xiaohui.xin@xxxxxxxxx>

 

 

 

Attachment: logdirty.diff
Description: logdirty.diff

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