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0e1f616
(Get the code!)
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This review of a patch that introduced "acked_features = backend_features" behaviour suggests that acked_features should be 0 by default, but it ended up pushing it as it is now (as they say that not setting acked_features to backend_features sometimes makes acked_features value 'unexpected')
Other devices initialize acked_features to guest_features (basically what VM writes to driver_features ANDed with device_features), changing default value to any of those (0 as review initially suggested, or guest_features) should fix this problem for us