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...not negotiate VIRTIO_BALLOON_F_MUST_TELL_HOST is also using pages before telling the host. Thus, even though the feature used to be just for communication from the host, known drivers are really using it to communicate was in the other direction, as if the feature was named "VIRTIO_BALLOON_F_GUEST_TELLS_HOST". Adjust the spec to conform, and add a new feature bit for the host to tell the drivers if silent deflation is actually supported. With this new feature bit, the host can distinguish all three cases: will never do silent deflation, will do silent deflation if available, will alway...

...not negotiate VIRTIO_BALLOON_F_MUST_TELL_HOST is also using pages before telling the host. Thus, even though the feature used to be just for communication from the host, known drivers are really using it to communicate was in the other direction, as if the feature was named "VIRTIO_BALLOON_F_GUEST_TELLS_HOST". Adjust the spec to conform, and add a new feature bit for the host to tell the drivers if silent deflation is actually supported. With this new feature bit, the host can distinguish all three cases: will never do silent deflation, will do silent deflation if available, will alway...