Re: [virtio] [OASIS Issue Tracker] Created: (VIRTIO-10) Allow arbitrary descriptor layouts / message framing.

Rusty Russell <> writes:
> OASIS Issues Tracker <> writes:
>
>> Allow arbitrary descriptor layouts / message framing.
>> -----------------------------------------------------
>>
>>                  Key: VIRTIO-10
>>                  URL: http://tools.oasis-open.org/issues/browse/VIRTIO-10
>>              Project: OASIS Virtual I/O Device (VIRTIO) TC
>>           Issue Type: Improvement
>>             Reporter: Rusty Russell
>>
>>
>> This will require a change in virtio_blk's SCSI commands, which requires framing cues.
>
> This it it on top of virtio-18 (which removes the virtio_blk SCSI
> commands):

On top of that, another change is required in block section:

commit e1073b518165308836391738f2cf8d8ba1ca37e0
Author: Rusty Russell <>
Date:   Wed Sep 11 13:30:47 2013 +0930

    2.4.2.5 Move block device header layout advice to legacy section.
    
    A continuation of bug virtio-10.
    
    Signed-off-by: Rusty Russell <>

diff --git a/virtio-v1.0-wd01-part1-specification.txt b/virtio-v1.0-wd01-part1-specification.txt
index 5350910..6ab1feb 100644
--- a/virtio-v1.0-wd01-part1-specification.txt
+++ b/virtio-v1.0-wd01-part1-specification.txt
@@ -1698,12 +1698,12 @@ error or VIRTIO_BLK_S_UNSUPP for a request unsupported by host:
 	#define VIRTIO_BLK_S_IOERR     1
 	#define VIRTIO_BLK_S_UNSUPP    2
 
+2.4.2.5.1 Legacy Interface: Device Operation
+------------------------
 Historically, devices assumed that the fields type, ioprio and sector
 reside in a single, separate read-only buffer and the status field is
 a separate read-only buffer of size 1 byte, by itself.
 
-2.4.2.5.1 Legacy Interface: Device Operation
-------------------------
 If the device has VIRTIO_BLK_F_SCSI feature, it can also support
 scsi packet command requests, each of these requests is of form: