[Xen-devel] Max number of mapped pages by grant table

[Steven <wangwangkang@xxxxxxxxx>]

Hi, All
I am trying to share about 20MB data between dom0 and domU, which is
about  5120 pages. After looking into different sharing mechanisms
between domains, grant table seems a suitable option to me.
I have a question about the max number of mapped page via grant table
from dom0 to dom0. When the number of granted page is <= 532, dom0
succeeds in mapping the pages.
However, when the number of granted pages is > 532, dom0 fails to map
the pages which are from the 533th page. The error message is that
    (XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)

I am using xen-4.0.1, and dom0 kernel is 2.6.32.33. Is there any
limitation on the number of mapped pages? Any solution to this?
Thanks.


- Steven

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