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There's a hypercall being issued in order to determine whether PV64 is supported, but since Xen 4.3 that's strictly true so it's not required. Plus, this way we can avoid mapping the privcmd interface altogether in the depriv pygrub. This is part of XSA-443 / CVE-2023-34325 Signed-off-by: Alejandro Vallejo <alejandro.vallejo@cloud.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>