devices/console: Remove requirement for first console port to be a console

Remove the assertion that the first port must have terminal properties.
This is not actually enforced by the spec, the only problem is you can't use
such virtio console for as the kernel argument.

Signed-off-by: Matej Hrica <[email protected]>

Author: mtjhrc

src/devices/src/virtio/console/device.rs

@@ -72,7 +72,6 @@ pub struct Console {
 impl Console {
     pub fn new(ports: Vec<PortDescription>) -> super::Result<Console> {
         assert!(!ports.is_empty(), "Expected at least 1 port");
-        assert!(ports[0].terminal.is_some(), "First port must be a console");
 
         let num_queues = num_queues(ports.len());
         let queues = vec![VirtQueue::new(QUEUE_SIZE); num_queues];
@@ -89,8 +88,8 @@ impl Console {
 
         let (cols, rows) = ports[0]
             .terminal()
-            .expect("Port 0 should always be a terminal")
-            .get_win_size();
+            .map(|t| t.get_win_size())
+            .unwrap_or((0, 0));
         let config = VirtioConsoleConfig::new(cols, rows, ports.len() as u32);
 
         Ok(Console {