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[Xen-devel] Question on xc_gnttab_map_grant_ref()


  • To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: NAHieu <nahieu@xxxxxxxxx>
  • Date: Thu, 3 Nov 2005 21:53:21 +0900
  • Delivery-date: Thu, 03 Nov 2005 12:50:24 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

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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