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S390: Don't tell guest we're updating config space
Currently we always set the "config space changed" bit to 1 when triggeringany virtio interrupt. While that worked in 2.6.27, newer kernels interpretthat value as "only the config space changed and nothing else happened"....
Add S390x virtio machine bus
On S390x we don't want to go through the hassle of emulating real existinghardware, because we don't need to for running Linux.
So let's instead implement a machine that is 100% based on VirtIO which wefortunately implement already....