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Isolation groups will eventually allow us to make sure certain devices, eg. PCI hostdevs, are assigned to guest PCI buses in a way that guarantees improved isolation, error detection and recovery for machine types and hypervisors that support it, eg. pSeries guest on QEMU. This patch merely defines storage for the new information we're going to need later on and makes sure it is passed from the hypervisor driver (QEMU / bhyve) down to the generic PCI address allocation code. Signed-off-by: Andrea Bolognani <abologna@redhat.com> Reviewed-by: Laine Stump <laine@laine.org>