i386/xen: implement HVMOP_set_param

This is the hook for adding the HVM_PARAM_CALLBACK_IRQ parameter in a
subsequent commit.

Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[dwmw2: Split out from another commit]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
1 file changed