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 <lingshan.zhu@intel.com>
Message-Id: <20240218185606.13509-10-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index bcea9f8..2d02ea6 100644 (file)
--- 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
index 797d570..4be8e3a 100644 (file)
--- 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,