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Re: [Xen-devel] xen_version hypercall

To: xen-devel@xxxxxxxxxxxxxxxxxxx, aq <aquynh@xxxxxxxxx>
Subject: Re: [Xen-devel] xen_version hypercall
From: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date: Sat, 4 Jun 2005 14:34:57 +0100
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> at the moment, xen_version hypercall returns only xen-version and
> xen-subversion (as a long number). but there is xen-extraversion. so i
> wonder if it is better for this hypercall to returns also
> extraversion? (so the return value is a string, not a number)

Hmmmm.  Well the xen_version hypercall is used for OSes to determine the ABI 
of the version of Xen they're running on (I think), so it kinda makes sense 
for that to be a long.

For your xm info updates my personal preference would be to leave the version 
hypercall the same and to fetch the additional details with a new dom0 op in 
the common directory (would anyone have a problem with this?).

The additional info would ideally allow the whole Xen version string to be 
pieced together, as displayed at boot e.g.

"Xen version 3.0-devel (mwilli2@) (gcc version 3.4.2 20041017 (Red Hat 
3.4.2-6.fc3)) Mon May 16 15:12:17 BST 2005"
(like uname -a)

Or a subset of that info.

What do you think?


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