Xen hypercall ABI rework
Owner: julieng
Time: Thursday 4:30 Final
Location: Contemporary, 6th Floor

The current hypercall ABI have some issues on Arm that would be warrant for a rework. Some of the issues are:

- Use of guest virtual address is not safe
- Hypercall taking a guest physical frame rather than a full address (problem with mix page granularity)
- A guest can share a page with Xen and another guest (see XSA-295)

During the session, I would expect collect potential other issues and trying to sketch a new ABI.