[Xen-devel] HYPERVISOR_memory_op XENMAPSPACE_shared_info failing under windows 64 bit

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

I'm now seeing what is involved in getting the windows GPL PV drivers
working under windows 64 bit (amd64), and it is crashing out almost
immediately.

I have confirmed with the debugger that I am mapping the hypercall stuff
in correctly, but when I try to map the shared info page in I get a -22
(-EINVAL).

Looking at the hypervisor code, the only place I can see where that code
path would return -EINVAL is:

"
        if ( !paging_mode_translate(d) || (mfn == 0) )
        {
            rcu_unlock_domain(d);
            return -EINVAL;
        }
"

So either mfn == 0, or (!paging_mode_translate(d)) == TRUE. The only way
I can see that the first could be true is if my xen_add_to_physmap
structure were corrupt or something.

Can anyone offer any suggestions?

Incidently, why is the gpfn field in xen_add_to_physmap only 32 bits?

Thanks

James

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