[RFC 1/4] docs/qcow2: add the zoned format feature

[Sam Li]

Add the specs for the zoned format feature of the qcow2 driver. Once
the zoned_profile is set to `zbc`, then the qcow2 file can be taken
as zoned devices and passed through by virtio-blk device to the guest.

Signed-off-by: Sam Li <faithilikerun@gmail.com>
---
 docs/system/qemu-block-drivers.rst.inc | 31 ++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/docs/system/qemu-block-drivers.rst.inc 
b/docs/system/qemu-block-drivers.rst.inc
index 105cb9679c..fdcf343652 100644
--- a/docs/system/qemu-block-drivers.rst.inc
+++ b/docs/system/qemu-block-drivers.rst.inc
@@ -172,6 +172,37 @@ This section describes each format and the options that 
are supported for it.
     filename`` to check if the NOCOW flag is set or not (Capital 'C' is
     NOCOW flag).
 
+  .. option:: zoned_profile
+
+    The option configures the zoned format feature on the qcow2 driver. If
+    this is set to ``zbc``, then it follows the basics of ZBC/ZAC protocol.
+
+  .. option:: zone_size
+
+    The size of a zone of the zoned device. The zoned device have the same
+    size of zones with an optional smaller last zone.
+
+  .. option:: zone_capacity
+
+    The capacity of a zone of the zoned device. The zoned device follows the
+    ZBC protocol tends to have the same size as its zone.
+
+  .. option:: zone_nr_conv
+
+    The number of conventional zones of the zoned device.
+
+  .. option:: max_open_zones
+
+    The maximal allowed open zones.
+
+  .. option:: max_active_zones
+
+    The limit of the zones with implicit open, explicit open or closed state.
+
+  .. option:: max_append_sectors
+
+    The maximal sectors that is allowed to append to zones while writing.
+
 .. program:: image-formats
 .. option:: qed
 
-- 
2.40.1