qdev: reset qdev along with qdev tree
This patch changes the reset handling so that qdev has no knowledge of the global system reset. Instead, a new bus/device level function is introduced that allows all devices/buses on the bus/device to be reset using a depth first transversal. N.B. we have to expose the implicit system bus because we have various hacks that result in an implicit system bus existing. Instead, we ought to have an explicitly created system bus that we can trigger reset from. That's a topic for a future patch though. Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com> Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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