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vhost: fix silent queue enabling with legacy guests
[ upstream commit 966027b ] vhost should notify the application in case of all vring state changes. In general, application should not care about negotiation of VHOST_USER_F_PROTOCOL_FEATURES. Protocol details like this should be hidden by the vhost library. With this patch applications like OVS will be able to assume that all vrings disabled by default and only process 'vring_state_changed' events. Fixes: 321203a ("vhost: enable rings at the right time") Signed-off-by: Ilya Maximets <i.maximets@samsung.com> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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