D25131.diff
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	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);