[RFC PATCH v7 19/22] vhost/vsock: SEQPACKET feature bit support

From: Arseny Krasnov <arseny.krasnov@kaspersky.com>
To: Stefan Hajnoczi <stefanha@redhat.com>,
	Stefano Garzarella <sgarzare@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Jorgen Hansen <jhansen@vmware.com>,
	Andra Paraschiv <andraprs@amazon.com>,
	Norbert Slusarek <nslusarek@gmx.net>,
	Colin Ian King <colin.king@canonical.com>,
	Alexander Popov <alex.popov@linux.com>
Cc: <kvm@vger.kernel.org>,
	<virtualization@lists.linux-foundation.org>,
	<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<stsp2@yandex.ru>, <arseny.krasnov@kaspersky.com>,
	<oxffffaa@gmail.com>
Subject: [RFC PATCH v7 19/22] vhost/vsock: SEQPACKET feature bit support
Date: Tue, 23 Mar 2021 16:14:47 +0300	[thread overview]
Message-ID: <20210323131450.2461998-1-arseny.krasnov@kaspersky.com> (raw)
In-Reply-To: <20210323130716.2459195-1-arseny.krasnov@kaspersky.com>

This adds handling of SEQPACKET bit: if guest sets features with
this bit cleared, then SOCK_SEQPACKET support will be disabled.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
---
 drivers/vhost/vsock.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 5af141772068..710d99e61ccc 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -31,7 +31,8 @@
 
 enum {
 	VHOST_VSOCK_FEATURES = VHOST_FEATURES |
-			       (1ULL << VIRTIO_F_ACCESS_PLATFORM)
+			       (1ULL << VIRTIO_F_ACCESS_PLATFORM) |
+			       (1ULL << VIRTIO_VSOCK_F_SEQPACKET)
 };
 
 enum {
@@ -796,6 +797,9 @@ static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
 			goto err;
 	}
 
+	if (features & (1ULL << VIRTIO_VSOCK_F_SEQPACKET))
+		vhost_transport.seqpacket_allow = true;
+
 	for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
 		vq = &vsock->vqs[i];
 		mutex_lock(&vq->mutex);
-- 
2.25.1

