vhost: support for "standalone" vhost-user daemons #174
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Although originally introduced for VDPA we also have support for get/set status messages for vhost-user. So lets promote the trait functions to the main VhostBackend traits while providing a default implementation which responds for errors (which the Kernel variant would inherit). As the status bits are common between backends most of the implementation details can be handled within the vhost-user traits. Signed-off-by: Alex Bennée <[email protected]> --- v2 - also add impls for DummySlaveReqHandler - move VhostVdpa impls to impl<T: VhostKernBackend> VhostBackend for T
This seems like an awful lot of boilerplate (without even any test) to implement a single message. Signed-off-by: Alex Bennée <[email protected]>
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Although originally introduced for VDPA we also want to support this for vhost-user. This requires supporting SET/GET status by moving the trait implementations around and a new message called BACKEND_SPECS which allows the backend to report its capabilities to the VMM as it boots up.
I suspect I need some extra handling for properly setting things like FEATURES_OK and DEVICE_NEED_RESET. And some tests of course. I shall be shortly posting the RFC patches for QEMU to support this. As such this will be a draft PR for comment for now.