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I am trying to port Xenloop to Xen 4.0.1 and 2.6.35. It uses the
following piece of code to map a granted page:

xfc->descriptor_vmarea = alloc_vm_area(PAGE_SIZE);
xfc->fifo_vmarea = alloc_vm_area( MAX_FIFO_PAGES*PAGE_SIZE );
if(!xfc->descriptor_vmarea || !xfc->fifo_vmarea) {
EPRINTK("error: cannot allocate memory for descriptor OR FIFO\n");
goto err;
}

gnttab_set_map_op(&map_op, (unsigned long)xfc->descriptor_vmarea->addr,
GNTMAP_host_map, remote_gref, remote_domid);
ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &map_op, 1);

but alloc_vm_area fails and crashes domU. in_interrupt() returns 256
and I think this is the cause. Any idea about what should I do?
Thanks,
- Mohammad

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