Index: head/sys/dev/virtio/mmio/virtio_mmio.c
===================================================================
--- head/sys/dev/virtio/mmio/virtio_mmio.c
+++ head/sys/dev/virtio/mmio/virtio_mmio.c
@@ -390,7 +390,13 @@
 
 	sc = device_get_softc(dev);
 
+	vtmmio_write_config_4(sc, VIRTIO_MMIO_HOST_FEATURES_SEL, 1);
 	host_features = vtmmio_read_config_4(sc, VIRTIO_MMIO_HOST_FEATURES);
+	host_features <<= 32;
+
+	vtmmio_write_config_4(sc, VIRTIO_MMIO_HOST_FEATURES_SEL, 0);
+	host_features |= vtmmio_read_config_4(sc, VIRTIO_MMIO_HOST_FEATURES);
+
 	vtmmio_describe_features(sc, "host", host_features);
 
 	/*
@@ -402,6 +408,11 @@
 	sc->vtmmio_features = features;
 
 	vtmmio_describe_features(sc, "negotiated", features);
+
+	vtmmio_write_config_4(sc, VIRTIO_MMIO_HOST_FEATURES_SEL, 1);
+	vtmmio_write_config_4(sc, VIRTIO_MMIO_GUEST_FEATURES, features >> 32);
+
+	vtmmio_write_config_4(sc, VIRTIO_MMIO_HOST_FEATURES_SEL, 0);
 	vtmmio_write_config_4(sc, VIRTIO_MMIO_GUEST_FEATURES, features);
 
 	return (features);