linux-kernel - [PATCH V1] vdpa: suspend and resume require DRIVER

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Date: Fri,  9 Feb 2024 14:29:59 -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>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Steve Sistare <steven.sistare@...cle.com>
Subject: [PATCH V1] vdpa: suspend and resume require DRIVER_OK

Calling suspend or resume requires VIRTIO_CONFIG_S_DRIVER_OK, for all
vdpa devices.

Suggested-by: Eugenio Perez Martin <eperezma@...hat.com>"
Signed-off-by: Steve Sistare <steven.sistare@...cle.com>
---
 drivers/vhost/vdpa.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index bc4a51e4638b..ce1882acfc3b 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -598,6 +598,9 @@ static long vhost_vdpa_suspend(struct vhost_vdpa *v)
 	if (!ops->suspend)
 		return -EOPNOTSUPP;
 
+	if (!(ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK))
+		return -EINVAL;
+
 	ret = ops->suspend(vdpa);
 	if (!ret)
 		v->suspended = true;
@@ -618,6 +621,9 @@ static long vhost_vdpa_resume(struct vhost_vdpa *v)
 	if (!ops->resume)
 		return -EOPNOTSUPP;
 
+	if (!(ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK))
+		return -EINVAL;
+
 	ret = ops->resume(vdpa);
 	if (!ret)
 		v->suspended = false;
-- 
2.39.3