tree 1359ba3dbc655254d5bde1a04322b985ca5f5a26
parent 0b47a6bd1150f4846b1d61925a4cc5a96593a541
author Stefano Stabellini <sstabellini@kernel.org> 1484330843 -0800
committer Stefano Stabellini <sstabellini@kernel.org> 1484330843 -0800

partially revert "xen: Remove event channel notification through Xen PCI platform device"

Commit 72a9b186292d ("xen: Remove event channel notification through Xen
PCI platform device") broke Linux when booting as Dom0 on Xen in a
nested Xen environment (Xen installed inside a Xen VM). In this
scenario, Linux is a PV guest, but at the same time it uses the
platform-pci driver to receive notifications from L0 Xen. vector
callbacks are not available because L1 Xen doesn't allow them.

Partially revert the offending commit, by restoring IRQ based
notifications for PV guests only. I restored only the code which is
strictly needed and replaced the xen_have_vector_callback checks within
it with xen_pv_domain() checks.

Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>