[PATCH] vdpa_sim: Document planned packed-ring support

From: xiongweimin <[email protected]>

Note that VIRTIO_F_RING_PACKED should be advertised once vringh packed
helpers exist. No functional change.

Signed-off-by: xiongweimin <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: [email protected]
---

--- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
@@ -13,6 +13,10 @@
 #include <linux/vhost_iotlb.h>
 #include <uapi/linux/virtio_config.h>
 
+/*
+ * Once vringh packed helpers land, also advertise VIRTIO_F_RING_PACKED
+ * here so vdpa_sim can exercise HW-like packed rings.
+ */
 #define VDPASIM_FEATURES	((1ULL << VIRTIO_F_ANY_LAYOUT) | \
 				 (1ULL << VIRTIO_F_VERSION_1)  | \
 				 (1ULL << VIRTIO_F_ACCESS_PLATFORM))