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authorDavid Gibson <david@gibson.dropbear.id.au>2019-10-17 12:12:35 +1100
committerDavid Gibson <david@gibson.dropbear.id.au>2019-11-26 10:11:30 +1100
commit3607715a308d94b8c4797d23620e268a4c5bebf6 (patch)
treea3f1adb13ab965f57e19f2698aa9caab36f52f77 /.travis.yml
parent454590916caacef2c779351f6c79d1c448bb6f38 (diff)
kvm: Introduce KVM irqchip change notifier
Awareness of an in kernel irqchip is usually local to the machine and its top-level interrupt controller. However, in a few cases other things need to know about it. In particular vfio devices need this in order to accelerate interrupt delivery. If interrupt routing is changed, such devices may need to readjust their connection to the KVM irqchip. pci_bus_fire_intx_routing_notifier() exists to do just this. However, for the pseries machine type we have a situation where the routing remains constant but the top-level irq chip itself is changed. This occurs because of PAPR feature negotiation which allows the guest to decide between the older XICS and newer XIVE irq chip models (both of which are paravirtualized). To allow devices like vfio to adjust to this change, introduce a new notifier for the purpose kvm_irqchip_change_notify(). Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Tested-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org> Acked-by: Alex Williamson <alex.williamson@redhat.com>
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