diff options
| -rw-r--r-- | content.tex | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/content.tex b/content.tex index 0aed373..7e112c7 100644 --- a/content.tex +++ b/content.tex @@ -2107,7 +2107,7 @@ about a queue. It uses the following structure for communicating: struct vq_config_block { be16 index; be16 max_num; -} __attribute__ ((packed)); +}; \end{lstlisting} The requested number of buffers for queue \field{index} is returned in @@ -2125,7 +2125,7 @@ struct vq_info_block { be16 num; be64 avail; be64 used; -} __attribute__ ((packed)); +}; \end{lstlisting} \field{desc}, \field{avail} and \field{used} contain the guest addresses for the descriptor table, @@ -2144,7 +2144,7 @@ struct vq_info_block_legacy { be32 align; be16 index; be16 num; -} __attribute__ ((packed)); +}; \end{lstlisting} \field{queue} contains the guest address for queue \field{index}, \field{num} the number of buffers @@ -2192,12 +2192,13 @@ communication block: struct virtio_feature_desc { le32 features; u8 index; -} __attribute__ ((packed)); +}; \end{lstlisting} \field{features} are the 32 bits of features currently accessed, while \field{index} describes which of the feature bit values is to be -accessed. +accessed. No padding is added at the end of the structure, it is +exactly 5 bytes in length. The guest obtains the device's device feature set via the CCW_CMD_READ_FEAT command. The device stores the features at \field{index} @@ -2293,6 +2294,9 @@ significant bit in the first byte is assigned the bit number 0. \field{isc} contains the I/O interruption subclass to be used for the adapter I/O interrupt. It MAY be different from the isc used by the proxy virtio-ccw device's subchannel. +No padding is added at the end of the structure, it is exactly 25 bytes +in length. + If the driver has already set up classic queue indicators via the CCW_CMD_SET_IND command, the device MUST post a unit check with |