Re: [Xen-devel] [PATCH 05 of 15 v2] docs: add a document describing the xl cfg file syntax

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2011-11-25 at 15:16 +0000, Paul Durrant wrote:
> > -----Original Message-----
> > From: Ian Campbell
> > Sent: 25 November 2011 15:06
> > To: xen-devel@xxxxxxxxxxxxxxxxxxx
> > Cc: Ian Jackson; Paul Durrant
> > Subject: Re: [Xen-devel] [PATCH 05 of 15 v2] docs: add a document
> > describing the xl cfg file syntax
> > 
> > Paul,
> > 
> > On Fri, 2011-11-25 at 14:49 +0000, Ian Campbell wrote:
> > >
> > > +=item B<viridian=BOOLEAN>
> > > +
> > > +Turns on or off the exposure of MicroSoft Hyper-V (AKA viridian)
> > > +compatible enlightenments to the guest.  These can improve
> > > performance
> > > +of Microsoft Windows guests (XXX which versions of Windows
> > benefit?)
> > 
> > Is there anything else we can say here? What are the first versions
> > of Windows which benefit from this?
> > 
> 
> Ian,
> 
>   I think that's probably good enough. AFAIK viridian enlightenments
> came in with the 6.0 kernel in Vista/2K8 but having the flag on should
> do no harm for older kernels.

How about this incremental patch?

diff -r b4c07fbe3557 docs/man/xl.cfg.pod.5
--- a/docs/man/xl.cfg.pod.5     Fri Nov 25 15:11:30 2011 +0000
+++ b/docs/man/xl.cfg.pod.5     Fri Nov 25 15:23:14 2011 +0000
@@ -555,7 +555,13 @@ Windows L<http://wiki.xen.org/wiki/XenWi
 
 Turns on or off the exposure of MicroSoft Hyper-V (AKA viridian)
 compatible enlightenments to the guest.  These can improve performance
-of Microsoft Windows guests (XXX which versions of Windows benefit?)
+of Microsoft Windows guests from Windows Vista and Windows 2008
+onwards and setting this option for such guests is strongly
+recommended. This option should be harmless for other versions of
+Windows (although it won't give any benefit) and the majority of other
+non-Windows OSes. However it is known to be incompatible with some
+other Operating Systems and in some circumstance can prevent Xen's own
+paravirtualisation interfaces for HVM guests from being used.
 
 =back
 



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