Re: [virtio-comment] [ERRATUM?] 5.5.6.3 Memory Statistics: 6 -> 10 byte

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, May 24, 2019 at 11:35:47AM +0200, Philipp Hahn wrote:
> Hello Michael,
> 
> Am 24.05.19 um 05:39 schrieb Michael S. Tsirkin:
> > On Thu, May 23, 2019 at 02:51:48PM +0200, Philipp Hahn wrote:
> >> quoting
> >> <https://docs.oasis-open.org/virtio/virtio/v1.1/cs01/virtio-v1.1-cs01.html#x1-2930003>:
> >>
> >>> Within the buffer, statistics are an array of 6-byte entries. 
> >>                                                 ^
> >>> Each statistic consists of a 16 bit tag and a 64 bit value.
> >> ...
> >>> struct virtio_balloon_stat { 
> >> ...
> >>>         le16 tag; 
> >>>         le64 val; 
> >>> } __attribute__((packed));
> >>
> >> If my calculation is right that is a (16 + 64) = 80 bits which is a
> >> 10-byte sized entry - not 6-byte.
> > 
> > 
> > Agreed. Want to open a github issue?
> 
> Sure, here it is: <https://github.com/oasis-tcs/virtio-spec/issues/45>
> 
> Patch attached and also available from
> <https://github.com/univention/virtio-spec/commit/609dbbbe71fc9143c2849d2c9c2d481ec178ce30>
> 
> Philipp

> >From 609dbbbe71fc9143c2849d2c9c2d481ec178ce30 Mon Sep 17 00:00:00 2001
> Message-Id: <609dbbbe71fc9143c2849d2c9c2d481ec178ce30.1558690397.git.hahn@univention.de>
> From: Philipp Hahn <hahn@univention.de>
> Date: Fri, 24 May 2019 11:29:17 +0200
> Subject: [PATCH] Issue #45: Fix Memory Statistics structure size
> 
> > Within the buffer, statistics are an array of 6-byte entries.
>                                                 ^
> > Each statistic consists of a 16 bit tag and a 64 bit value.
> ...
> > struct virtio_balloon_stat {
> ...
> >         le16 tag;
> >         le64 val;
> > } __attribute__((packed));
> 
> If my calculation is right that is a (16 + 64) = 80 bits which is a
> 10-byte sized entry - not 6-byte.
> ---
>  content.tex | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/content.tex b/content.tex
> index 193b6e1..dee1f28 100644
> --- a/content.tex
> +++ b/content.tex
> @@ -4766,7 +4766,7 @@ \subsubsection{Memory Statistics}\label{sec:Device Types / Memory Balloon Device
>    subsequent request) and consumes the statistics.
>  \end{enumerate}
>  
> -  Within the buffer, statistics are an array of 6-byte entries.
> +  Within the buffer, statistics are an array of 10-byte entries.
>    Each statistic consists of a 16 bit
>    tag and a 64 bit value. All statistics are optional and the
>    driver chooses which ones to supply. To guarantee backwards
> -- 
> 2.11.0
> 
> 

Thanks!
Unfortunately neither form gets the patch into our mailing
list archives as required by the TC bylaws.
See https://lists.oasis-open.org/archives/virtio-comment/201905/msg00014.html
for what got archived.

The thing to do is to include the patch inline in the message body.
Thanks and sorry for the run-around!




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