Re: [Xen-users] matching Qemu version to Xen version, how critical?

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

Anthony, and Stefano, see below.  I haven't investigated at all.

Mark: I think you are probably fine to use the Debian version.

Mark Pryor writes ("Re: [Xen-users] matching Qemu version to Xen version, how 
critical?"):
> Hello,
> 
> https://paste.fedoraproject.org/paste/o15OrLa~PY98S3EPm6P-Ag/
> 
> https://tracker.debian.org/news/877656
> 
>  
> on Oct 02, Debian-security released 8 fixes for qemu-2.8. In total there are
> 46 patches since the release of qemu-2.8 on Jul 21.
> 
> As shown, in the fpaste, I applied these 46 to the upstream xen-4.9 tarball
> while
> trying to package in Stretch. All applied cleanly.
> 
> As a source of qemu fixes xen-4.9, I've looked here:
> http://xenbits.xen.org/gitweb/?p=qemu-xen.git;a=shortlog;h=refs/heads/
> staging-4.9
> 
> you can see there is only 1 fix since the release of xen-4.9.0 (Jun 27).
> 
> Any harm in using the debian-delta for qemu fixes? Should these be auto-tested
> by xenproject?
> 
> PryMar56
> 
> On Thursday, October 5, 2017 3:51 AM, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> wrote:
> 
> 
> Mark Pryor writes ("matching Qemu version to Xen version, how critical?"):
> 
> ...
> > Please tell me it doesn't matter what version of qemu is used with
> > Xen, as long as they are build together. How critical can it be?
> 
> 
> It's not very critical, if you are using a released version of Xen.
> In particular, if it builds, you're unlikely to go very far wrong.
> 
> NB though that (as you suggest from "built together") the Xen control
> libraries that qemu uses 1. do not have a stable ABI until recently
> (sorry) 2. do not have a stable interface to the hypervisor.
> 
> So unless you are using the very latest bits, you must rebuild when
> you use a different Xen version.
> 
> Additionally, the qemu configure script works by determining the Xen
> version (rather than by looking for individual features) and keying
> everything off that.  So if you are using xen-unstable, you will find
> that some qemu versions don't build.
> 
> Ian.
> 
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> 
> 

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