Add three varlink interface definitions for the machine instance control hierarchy: - io.systemd.MachineInstance: generic operations applicable to both containers and VMs (PowerOff, Reboot, Pause, Resume, QueryStatus, SubscribeEvents). nspawn could implement this same interface later. - io.systemd.VirtualMachineInstance: VM-specific but VMM-agnostic operations. Empty for now, future home for AddBlockDevice and similar. - io.systemd.QemuMachineInstance: QEMU-specific operations. Defines AcquireQMP() for protocol upgrade to a direct QMP connection. The "Instance" suffix avoids collision with machined's existing io.systemd.Machine interface. Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
System and Service Manager
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