Re: [Xen-devel] [PATCH LIBVIRT v1 1/2] libxl: Correct value for xendConfigVersion to xen{Parse, Format}ConfigCommon

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Thu, Dec 03, 2015 at 11:13:06PM -0700, Jim Fehlig wrote:
> On 11/26/2015 09:59 AM, Ian Campbell wrote:
> > libxlConnectDomainXMLFromNative calls both xenParseXM and xenParseXL
> > with cfg->verInfo->xen_version_major, however AFAICT they both (either
> > inherently, or through there use of xenParseConfigCommon expect a
> > value from xenConfigVersionEnum (which does not correspond to
> > xen_version_major).
> 
> I recall being a little apprehensive about using xen_version_major when 
> writing
> the code, and apparently that was justified. But now that we are revisiting
> this, I wonder if we care about these old xend config versions at all. Is 
> anyone
> even running Xen 3.0.x, or 3.1.x, particularly with a newish libvirt? IMO we
> could drop all of this xend config nonsense and go with the code associated 
> with
> the last xend config version, i.e. XEND_CONFIG_VERSION_3_1_0.
> 
> And while mentioning dropping support for these old xend config versions, do I
> dare mention dropping the xend driver altogether? :-) It will certainly need 
> to
> be done some day. Question is whether that's a bit premature now.

We just decided to drop QEMU driver code supporting for RHEL-5 vintage
distros, requiring RHEL-6 as minimum. So I think it is entirely reasonable
to drop Xen driver code supporting similar vintage XenD.  That would
certainly simplify or even eliminate the current crazy xend_config_version
code we have

I think we need to continue suppoorting XenD driver for a while, but at
least you can simplify the code shared with libxl.

Regards,
Daniel
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