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[Xen-API] Memory copy between dom0 and domU - issues

Hi folks,
I have some issues when trying to copy the memory block from Dom0 to DomU using the
xc_map_foreign_range.
It throws me an error saying that it 
"xc_map_foreign_range: ioctl failed" or else sometimes it says that it could not map the "PT".
Could you tell me what might be the problem. Or else if you have a sample code that I could take a look at as to how to copy the memory block
from the dom0 to domU.
I am running xen 3.3.1 on Centos and using a Ubuntu as my Guest OS, running in HVM  mode (Fully virtualized).
 
Thanks.
Swaminathan Vasudevan
Systems Software Engineer (TC)


HP ProCurve
Hewlett-Packard
8000 Foothills Blvd
M/S 5541
Roseville, CA - 95747
tel: 916.785.0937
fax: 916.785.1815
email: swaminathan.vasudevan@xxxxxx
 
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