hw/virtio: Add PCIe capability to virtio devices
The virtio devices are converted to PCI-Express if they are plugged into a PCI-Express bus and the 'modern' protocol is enabled. Devices plugged directly into the Root Complex as Integrated Endpoints remain PCI. Signed-off-by: NMarcel Apfelbaum <marcel@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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