[Xen-devel] HVMOP_guest_request_vm_event only works from guest in ring0

[Bread Cutter <cutter409@xxxxxxxxx>]

Hello all,

I'm writing an executable that runs inside of a guest, and I planned
to use vmcall to talk to a tool running in Dom0, using the vm_event
API. It didn't work, and looking through the code, the first thing
hvm_do_hypercall() does is check if the guest is in ring0. If not, it
returns EPERM and exits.

In the case of HVMOP_guest_request_vm_event, I'd rather it be up to my
code if a call can be made from CPL>0. Is this done intentionally?

Thanks!

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