linux-kernel - [PATCH RFC v2 07/10] vdpa: Remove the restriction that only supports virtio-net devices

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Message-Id: <20210128144127.113245-8-sgarzare@redhat.com>
Date:   Thu, 28 Jan 2021 15:41:24 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     Xie Yongji <xieyongji@...edance.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Laurent Vivier <lvivier@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, Max Gurtovoy <mgurtovoy@...dia.com>,
        Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org
Subject: [PATCH RFC v2 07/10] vdpa: Remove the restriction that only supports virtio-net devices

From: Xie Yongji <xieyongji@...edance.com>

With VDUSE, we should be able to support all kinds of virtio devices.

Signed-off-by: Xie Yongji <xieyongji@...edance.com>
---
 drivers/vhost/vdpa.c | 28 ++--------------------------
 1 file changed, 2 insertions(+), 26 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index ef688c8c0e0e..28624cbfe6dd 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -185,26 +185,6 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
 	return 0;
 }
 
-static int vhost_vdpa_config_validate(struct vhost_vdpa *v,
-				      struct vhost_vdpa_config *c)
-{
-	long size = 0;
-
-	switch (v->virtio_id) {
-	case VIRTIO_ID_NET:
-		size = sizeof(struct virtio_net_config);
-		break;
-	}
-
-	if (c->len == 0)
-		return -EINVAL;
-
-	if (c->len > size - c->off)
-		return -E2BIG;
-
-	return 0;
-}
-
 static long vhost_vdpa_get_config(struct vhost_vdpa *v,
 				  struct vhost_vdpa_config __user *c)
 {
@@ -215,7 +195,7 @@ static long vhost_vdpa_get_config(struct vhost_vdpa *v,
 
 	if (copy_from_user(&config, c, size))
 		return -EFAULT;
-	if (vhost_vdpa_config_validate(v, &config))
+	if (config.len == 0)
 		return -EINVAL;
 	buf = kvzalloc(config.len, GFP_KERNEL);
 	if (!buf)
@@ -243,7 +223,7 @@ static long vhost_vdpa_set_config(struct vhost_vdpa *v,
 
 	if (copy_from_user(&config, c, size))
 		return -EFAULT;
-	if (vhost_vdpa_config_validate(v, &config))
+	if (config.len == 0)
 		return -EINVAL;
 
 	buf = vmemdup_user(c->buf, config.len);
@@ -1021,10 +1001,6 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
 	int minor;
 	int r;
 
-	/* Currently, we only accept the network devices. */
-	if (ops->get_device_id(vdpa) != VIRTIO_ID_NET)
-		return -ENOTSUPP;
-
 	v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
 	if (!v)
 		return -ENOMEM;
-- 
2.29.2