From: Michalis Pappas <michalis@unikraft.io>
Date: Wed, 20 Sep 2023 16:24:47 +0000 (+0200)
Subject: drivers/virtio/ring: Add basic support for modern virtio
X-Git-Tag: RELEASE-0.15.0~102
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=00970e1079176f0d7332e0676b9830ff278529f6;p=unikraft%2Funikraft.git

drivers/virtio/ring: Add basic support for modern virtio

This commit adds the minimum set of changes required for modern virtio
support.

Signed-off-by: Marco Schlumpp <marco@unikraft.io>
Signed-off-by: Michalis Pappas <michalis@unikraft.io>
Reviewed-by: Andrei Topala <topala.andrei@gmail.com>
Approved-by: Razvan Deaconescu <razvand@unikraft.io>
GitHub-Closes: #1115
---

diff --git a/drivers/virtio/ring/virtio_ring.c b/drivers/virtio/ring/virtio_ring.c
index d0883b216..1cdcc89bf 100644
--- a/drivers/virtio/ring/virtio_ring.c
+++ b/drivers/virtio/ring/virtio_ring.c
@@ -233,10 +233,9 @@ __u64 virtqueue_feature_negotiate(__u64 feature_set)
 {
 	__u64 feature = (1ULL << VIRTIO_TRANSPORT_F_START) - 1;
 
-	/**
-	 * Currently out vring driver does not support any ring feature. We will
-	 * add support to transport feature in the future.
-	 */
+	/* Allow version 1 flag */
+	feature |= 1ULL << VIRTIO_F_VERSION_1;
+
 	feature &= feature_set;
 	return feature;
 }