[Xen-devel] Question on xc_gnttab_map_grant_ref()

[NAHieu <nahieu@xxxxxxxxx>]

Hi,

I am writing a kermel module in DomU, and this module grants a page of
memory to Dom0. Then in Dom0 I try to grant_map it with
xc_gnttab_map_grant_ref()

But this function requires a flag, and I don't know which option to
give it. I tried with either GNTMAP_application_map or
GTF_reading|GTF_writing, but I always got this error:

ERROR: do_gnttab_op: HYPERVISOR_grant_table_op failed: -1

Anybody please tell me how to use xc_gnttab_map_grant_ref() properly
in Dom0's userspace?


Many thanks.
Hieu

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