vDPA: report virtio-block read-only info to user space

This commit report read-only information of virtio-blk devices to user space. Signed-off-by: Zhu Lingshan <[email protected]> Message-Id: <[email protected]> Signed-off-by: Michael S. Tsirkin <[email protected]>
wafgo · Mar 19, 2024 · ae1374b · ae1374b
1 parent 6bdc784
commit ae1374b
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diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
@@ -1084,6 +1084,17 @@ vdpa_dev_blk_write_zeroes_config_fill(struct sk_buff *msg, u64 features,
 	return 0;
 }
 
+static int vdpa_dev_blk_ro_config_fill(struct sk_buff *msg, u64 features)
+{
+	u8 ro;
+
+	ro = ((features & BIT_ULL(VIRTIO_BLK_F_RO)) == 0) ? 0 : 1;
+	if (nla_put_u8(msg, VDPA_ATTR_DEV_BLK_CFG_READ_ONLY, ro))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
 static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
 				    struct sk_buff *msg)
 {
@@ -1122,6 +1133,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
 	if (vdpa_dev_blk_write_zeroes_config_fill(msg, features_device, &config))
 		return -EMSGSIZE;
 
+	if (vdpa_dev_blk_ro_config_fill(msg, features_device))
+		return -EMSGSIZE;
+
 	return 0;
 }
 

diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
@@ -70,6 +70,7 @@ enum vdpa_attr {
 	VDPA_ATTR_DEV_BLK_CFG_DISCARD_SEC_ALIGN,/* u32 */
 	VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEC,	/* u32 */
 	VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEG,	/* u32 */
+	VDPA_ATTR_DEV_BLK_CFG_READ_ONLY,		/* u8 */
 
 	/* new attributes must be added above here */
 	VDPA_ATTR_MAX,