Commits on Oct 10, 2024

1. virtio-device: extend VirtioDeviceActions trait …

   This commit enhances the VirtioDeviceActions Trait to accommodate Vhost
   and Vhost-User devices effectively. It introduces four new methods to
   the VirtioDeviceActions trait to facilitate seamless interaction with
   these devices:
   
   - `read_config` and `write_config`: These methods are invoked when the
   driver intends to read from or write to the device configuration space.
   Given that the device configuration space can be managed by various
   handlers outside of the VMM, such as vhost-user when the protocol
   feature CONFIG is negotiated, dedicated logic is necessary to handle
   these operations (e.g. GET_CONFIG/SET_CONFIG requests).
   - `negotiate_driver_features`:  This method is called when the driver
   finishes the negotiation of the device features with the frontend
   device (selecting page 0). This method is crucial when the device
   handler is implemented outside of the VMM since the frontend
   device needs to negotiate the features with the backend device.
   Otherwise, the device will not be prepared to support, for example,
   multiple queues and configuration space reads and writes.
   - `interrupt_status`: When the driver requires reading the interrupt
   status from the device, this method is invoked. Since the responsibility
   for managing interrupt status lies with the frontend device, specialized
   logic is needed to update the interrupt status appropriately (Used Buffer
   Notification or Configuration Change Notification). If the device is
   implemented within the VMM, the interrupt status is direct management
   and updating by the device.
   
   Signed-off-by: João Peixoto <[email protected]>

   

   joaopeixoto13 committed Oct 10, 2024
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