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-rw-r--r--docs/vfio-user.rst11
1 files changed, 6 insertions, 5 deletions
diff --git a/docs/vfio-user.rst b/docs/vfio-user.rst
index e3adc7a..f4562ef 100644
--- a/docs/vfio-user.rst
+++ b/docs/vfio-user.rst
@@ -714,7 +714,7 @@ Message format
+--------------+----------------------------+
| Command | 4 |
+--------------+----------------------------+
-| Message size | 16 in command, 32 in reply |
+| Message size | 32 |
+--------------+----------------------------+
| Flags | Reply bit set in reply |
+--------------+----------------------------+
@@ -724,9 +724,8 @@ Message format
+--------------+----------------------------+
This command message is sent by the client to the server to query for basic
-information about the device. Only the message header is needed in the command
-message. The VFIO device info structure is defined in ``<linux/vfio.h>``
-(``struct vfio_device_info``).
+information about the device. The VFIO device info structure is defined in
+``<linux/vfio.h>`` (``struct vfio_device_info``).
VFIO device info format
^^^^^^^^^^^^^^^^^^^^^^^
@@ -751,7 +750,9 @@ VFIO device info format
| num_irqs | 28 | 4 |
+-------------+--------+--------------------------+
-* *argsz* is the size of the VFIO device info structure.
+* *argsz* is the size of the VFIO device info structure. This is the only field
+that should be set to non-zero in the request, identifying the client's expected
+size. Currently this is a fixed value.
* *flags* contains the following device attributes.
* VFIO_DEVICE_FLAGS_RESET indicates that the device supports the