Remove the static netdev/nic INI config sections for both privileged TAP, nsresourced TAP, and user-mode networking. Replace them with a NetworkInfo struct that captures the network type, TAP fd or interface name, and MAC address, passed to vmspawn_varlink_setup_network() for runtime configuration via QMP. For the nsresourced TAP path the fd is now passed to QEMU via QMP getfd + SCM_RIGHTS instead of being inherited through pass_fds. Declare the MachineConfig aggregate that this and the following conversion patches populate, zero-initialized with explicit -EBADF for the fd fields so every sub-structure cleans up safely regardless of which device types the invocation ends up using. Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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