qemu: Unify generation of command line for virtio devices
A virtio device such as <controller type='scsi' model='virtio-scsi'/> will be translated to one of four different QEMU devices based on the address type. This behavior is the same for all virtio devices, but unfortunately we have separate ad-hoc code dealing with each and every one of them: not only this is pointless duplication, but it turns out that most of that code is not robust against new address types being introduced and some of it is outright buggy. Introduce a new function, qemuBuildVirtioDevStr(), which deals with the issue in a generic fashion, and rewrite all existing code to use it. This fixes a bunch of issues such as virtio-serial-pci being used with virtio-mmio addresses and virtio-gpu not being usable at all with virtio-mmio addresses. It also introduces a couple of minor regressions, namely no longer erroring out when attempting to use virtio-balloon and virtio-input devices with virtio-s390 addresses; that said, virtio-s390 has been superseded by virtio-ccw such a long time ago that recent QEMU releases have dropped support for the former entirely, so re-implementing such device-specific validation is not worth it. Signed-off-by: NAndrea Bolognani <abologna@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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