Wire up the runtime hotplug Varlink methods on the per-VM control
socket:
AddStorage → take fd from the link, look up the DiskType from the
'config' field, build a DriveInfo flagged
QMP_DRIVE_REMOVABLE, dispatch to
vmspawn_qmp_add_block_device(). Reply delivered async
by on_add_device_add_complete() once the guest sees
the device.
RemoveStorage → forward the user-visible name to
vmspawn_qmp_remove_block_device(); the existing
device_del / DEVICE_DELETED / blockdev-del chain
replies on the link.
Add SD_VARLINK_SERVER_ALLOW_FD_PASSING_INPUT to the server flags so
clients can push storage fds across via sd_varlink_push_fd().
Maps -EEXIST → StorageExists and -EOPNOTSUPP/-EINVAL →
ConfigNotSupported in the AddStorage handler so callers see the
specific MachineInstance errors.
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
System and Service Manager
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