linux-kernel - [RFC V1 11/13] vdpa/mlx5: new owner capability

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Date: Wed, 10 Jan 2024 12:40:13 -0800
From: Steve Sistare <steven.sistare@...cle.com>
To: virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Eugenio Perez Martin <eperezma@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Dragos Tatulea <dtatulea@...dia.com>, Eli Cohen <elic@...dia.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Steve Sistare <steven.sistare@...cle.com>
Subject: [RFC V1 11/13] vdpa/mlx5: new owner capability

The mlx5 vdpa device supports ownership transfer to a new process, so
advertise VHOST_BACKEND_F_NEW_OWNER.  User virtual addresses are not
used after they are initially translated to physical, so VHOST_IOTLB_REMAP
is not required, hence VHOST_BACKEND_F_IOTLB_REMAP is not advertised.

Signed-off-by: Steve Sistare <steven.sistare@...cle.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 26ba7da6b410..26f24fb0e160 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -2562,7 +2562,8 @@ static void unregister_link_notifier(struct mlx5_vdpa_net *ndev)
 
 static u64 mlx5_vdpa_get_backend_features(const struct vdpa_device *vdpa)
 {
-	return BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK);
+	return BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK) |
+	       BIT_ULL(VHOST_BACKEND_F_NEW_OWNER);
 }
 
 static int mlx5_vdpa_set_driver_features(struct vdpa_device *vdev, u64 features)
-- 
2.39.3