vhost_user: ignore unknown features from backend #243
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virtiofsd 1.11.0 added support for VHOST_USER_PROTOCOL_F_DEVICE_STATE. Upgrading virtiofsd meant that the latest released version of Cloud Hypervisor (39.0) was no longer able to communicate with it, because rather than just ignoring the unsupported feature, it got an unrecoverable "invalid message" error. This demonstrates that it's better for frontends to just ignore offers of unsupported features. If the backend requires some feature, it'll get a chance to know that when we send VHOST_USER_SET_PROTOCOL_FEATURES anyway. Signed-off-by: Alyssa Ross <hi@alyssa.is>
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Summary of the PR
virtiofsd 1.11.0 added support for VHOST_USER_PROTOCOL_F_DEVICE_STATE. Upgrading virtiofsd meant that the latest released version of Cloud Hypervisor (39.0) was no longer able to communicate with it, because rather than just ignoring the unsupported feature, it got an unrecoverable "invalid message" error. This demonstrates that it's better for frontends to just ignore offers of unsupported features. If the backend requires some feature, it'll get a chance to know that when we send VHOST_USER_SET_PROTOCOL_FEATURES anyway.
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