[PATCH 2/4] vDPA: only report driver features if FEATURES_OK is set
From: Zhu Lingshan <hidden>
Date: 2022-09-09 09:06:22
Also in:
kvm
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
vdpa_dev_net_config_fill() should only report driver features to userspace after features negotiation is done. Signed-off-by: Zhu Lingshan <redacted> --- drivers/vdpa/vdpa.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 798a02c7aa94..29d7e8858e6f 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c@@ -819,6 +819,7 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms struct virtio_net_config config = {}; u64 features_device, features_driver; u16 val_u16; + u8 status; vdev->config->get_config(vdev, 0, &config, sizeof(config));
@@ -834,10 +835,14 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16)) return -EMSGSIZE; - features_driver = vdev->config->get_driver_features(vdev); - if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver, - VDPA_ATTR_PAD)) - return -EMSGSIZE; + /* only read driver features after the feature negotiation is done */ + status = vdev->config->get_status(vdev); + if (status & VIRTIO_CONFIG_S_FEATURES_OK) { + features_driver = vdev->config->get_driver_features(vdev); + if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver, + VDPA_ATTR_PAD)) + return -EMSGSIZE; + } features_device = vdev->config->get_device_features(vdev);
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2.31.1