The changes introduced by the following patch:
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID 86d26e6ec89b3aba5512d981838caea043b157ab
# Parent 9091331dfb353212781622f3c9020492cb049178
Replace dom0_ops hypercall with three new hypercalls:
 1. platform_op -- used by dom0 kernel to perform actions on the
 hardware platform (e.g., MTRR access, microcode update, platform
 quirks, ...)
 2. domctl -- used by management tools to control a specified domain
 3. sysctl -- used by management tools for system-wide actions
are causing me a couple of problems. I'd appreciate some advice on how
to work with this new domctl interface.
The problem is that one of the dom0_ops (iomem_permission) that we were
previously using (to grant a domU access to an iomem page from dom0) is
now not accessible in the kernel to our drivers. 
A couple of posts on xen-devel following the check in suggest compiling
with __XEN_TOOLS__ for the few files that need to use domctl, but that
doesn't help a great deal as xen/domctl.h isn't even in the kernel
header files.
Is there some other method for granting access to an iomem page that I
should be using, or is this just not supported anymore?
Thanks
Kieran
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