[Xen-devel][PATCH] unshadow the page table page which are used as data page

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

The patch deals with the situation which guest OS uses unused page table pages as data pages and write data to them. The pages will still be grabbed by Xen as page table pages, and lots of unnecessary page faults occur.

The patch will check if the data guest writes to the page table contains valid mfn or not, if not, we believe it is a data page now and then unshadow the page.

The patch improves the VT-D NIC performance a lot.

 

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

     

Attachment: perf2.diff
Description: perf2.diff

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