diff --git a/virtio-spec.lyx b/virtio-spec.lyx
index 7a073f4..6d23ab9 100644
--- a/virtio-spec.lyx
+++ b/virtio-spec.lyx
@@ -58,6 +58,7 @@
 \html_be_strict false
 \author -608949062 "Rusty Russell,,," 
 \author 1531152142 "Paolo Bonzini,,," 
+\author 2090695081 "Cong Meng,,," 
 \end_header
 
 \begin_body
@@ -7028,6 +7029,19 @@ VIRTIO_SCSI_F_CHANGE
 
 (2) The host will report changes to LUN parameters via a VIRTIO_SCSI_T_PARAM_CHA
 NGE event.
+\change_inserted 2090695081 1345439613
+
+\end_layout
+
+\begin_layout Description
+
+\change_inserted 2090695081 1345442620
+VIRTIO_SCSI_F_PER_LUN_QUERY
+\begin_inset space ~
+\end_inset
+
+(3) The host will support the per-LUN parameter query.
+ 
 \change_unchanged
 
 \end_layout
@@ -8178,6 +8192,210 @@ response
 
 \begin_layout Standard
 No command-specific values are defined for the response byte.
+\change_inserted 2090695081 1345439679
+
+\end_layout
+
+\end_deeper
+\begin_layout Description
+
+\change_inserted 2090695081 1345441715
+Per
+\begin_inset space \space{}
+\end_inset
+
+LUN
+\begin_inset space \space{}
+\end_inset
+
+query
+\begin_inset space ~
+\end_inset
+
+
+\end_layout
+
+\begin_deeper
+\begin_layout Standard
+
+\change_inserted 2090695081 1345440230
+\begin_inset listings
+inline false
+status open
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345441722
+
+#define VIRTIO_SCSI_T_PER_LUN_QUERY             3
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345440248
+
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345441801
+
+/* query type */
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345441725
+
+#define VIRTIO_SCSI_T_PLQ_MAX_SECTORS           0 
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345441726
+
+#define VIRTIO_SCSI_T_PLQ_MAX_SEGMENTS          1 
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345441727
+
+#define VIRTIO_SCSI_T_PLQ_MAX_SEGMENT_SIZE      2 
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345440248
+
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345441729
+
+struct virtio_scsi_ctrl_plq {
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345440248
+
+    // Read-only part
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345440248
+
+    u32 type;
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345441767
+
+    u8  lun[8];
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345441807
+
+    u32 query_type;
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345440248
+
+    // Write-only part
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345440248
+
+    u8  response;
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345445844
+
+    u32 parameter;
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 2090695081 1345440248
+
+}
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 2090695081 1345443439
+The type field should be VIRTIO_SCSI_T_PER_LUN_QUERY.
+ 
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 2090695081 1345445951
+The query_type field is defined as below:
+\end_layout
+
+\begin_layout Itemize
+
+\change_inserted 2090695081 1345445082
+VIRTIO_SCSI_T_PLQ_MAX_SECTORS: Maximum request size of the LUN's request
+ queue.
+ The unit is KB (1024 bytes).
+\end_layout
+
+\begin_layout Itemize
+
+\change_inserted 2090695081 1345446052
+VIRTIO_SCSI_T_PLQ_MAX_SEGMENTS: Maximum sg list segments of the LUN's request
+ queue.
+\end_layout
+
+\begin_layout Itemize
+
+\change_inserted 2090695081 1345445058
+VIRTIO_SCSI_T_PLQ_MAX_SEGMENT_SIZE: Maximum segment size of the LUN's request
+ queue.
+ The unit is byte.
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 2090695081 1345445877
+By sending this command, the driver asks the specified LUN to report the
+ parameter specified by the query_type field.
+ The device responds by writing the parameter that it supports into the
+ parameter field, and VIRTIO_SCSI_S_OK into the response field.
+ Otherwise the device should write the corresponding failure response value
+ into the response field.
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 2090695081 1345443070
+All fields of the read-only part are written by the driver.
+ All fields of the write-only part are written by the device.
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 2090695081 1345440259
+No command-specific values are defined for the response byte.
 \end_layout
 
 \end_deeper
