[v1] virtio: features,fixes

[PULL 03/46] vhost-vdpa: check vhost_vdpa_set_vring_ready() return value

Michael S. Tsirkin posted 46 patches 5 months, 3 weeks ago

Diff against v1 v2 v2 v3 v3
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Maintainers: "Michael S. Tsirkin" <mst@redhat.com>, Igor Mammedov <imammedo@redhat.com>, Ani Sinha <anisinha@redhat.com>, Raphael Norwitz <raphael@enfabrica.net>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Jonathan Cameron <jonathan.cameron@huawei.com>, Fan Ni <fan.ni@samsung.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>, Jason Wang <jasowang@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Thomas Huth <thuth@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Paolo Bonzini <pbonzini@redhat.com>, Fam Zheng <fam@euphon.net>, "Alex Bennée" <alex.bennee@linaro.org>, Stefan Hajnoczi <stefanha@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Eduardo Habkost <eduardo@habkost.net>, Laurent Vivier <lvivier@redhat.com>

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[PULL 03/46] vhost-vdpa: check vhost_vdpa_set_vring_ready() return value

Posted by Michael S. Tsirkin 5 months, 3 weeks ago

From: Stefano Garzarella <sgarzare@redhat.com>

vhost_vdpa_set_vring_ready() could already fail, but if Linux's
patch [1] will be merged, it may fail with more chance if
userspace does not activate virtqueues before DRIVER_OK when
VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK is not negotiated.

So better check its return value anyway.

[1] https://lore.kernel.org/virtualization/20240206145154.118044-1-sgarzare@redhat.com/T/#u

Acked-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20240322092315.31885-1-sgarzare@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 net/vhost-vdpa.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 85e73dd6a7..eda714d1a4 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -399,7 +399,10 @@ static int vhost_vdpa_net_data_load(NetClientState *nc)
     }
 
     for (int i = 0; i < v->dev->nvqs; ++i) {
-        vhost_vdpa_set_vring_ready(v, i + v->dev->vq_index);
+        int ret = vhost_vdpa_set_vring_ready(v, i + v->dev->vq_index);
+        if (ret < 0) {
+            return ret;
+        }
     }
     return 0;
 }
@@ -1238,7 +1241,10 @@ static int vhost_vdpa_net_cvq_load(NetClientState *nc)
 
     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
 
-    vhost_vdpa_set_vring_ready(v, v->dev->vq_index);
+    r = vhost_vdpa_set_vring_ready(v, v->dev->vq_index);
+    if (unlikely(r < 0)) {
+        return r;
+    }
 
     if (v->shadow_vqs_enabled) {
         n = VIRTIO_NET(v->dev->vdev);
@@ -1277,7 +1283,10 @@ static int vhost_vdpa_net_cvq_load(NetClientState *nc)
     }
 
     for (int i = 0; i < v->dev->vq_index; ++i) {
-        vhost_vdpa_set_vring_ready(v, i);
+        r = vhost_vdpa_set_vring_ready(v, i);
+        if (unlikely(r < 0)) {
+            return r;
+        }
     }
 
     return 0;
-- 
MST