> This is a -EBUSY.  Is there anything magic about mfn 188d903?  It just looks 
> like plain RAM in the E820 table.

> Have you got dom0 configured to use linear p2m mode?  Without it, dom0 can 
> only have a maximum of 512GB of RAM.

> ~Andrew

No special configuration for dom0, actually, the server has only 128GB for RAM. 
 And the server can boot successfully with
Linux kernel v4.3 as the dom0.

Liang 

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