Re: [PATCH] tools: probe for existence of qemu-xen trace backends.

[Ian Campbell <ian.campbell@citrix.com>]

On Wed, 2016-02-10 at 14:44 +0000, Stefano Stabellini wrote:
> > > > But, if you use '--check-backend --backend' (no 's') instead, the
> > > > check
> > > > would works with qemu-xen >= 4.3
> > 
> > BTW, I think those correspond to
> > 
> > qemu-mainline == QEMU 2.5.50
> > qemu-xen-unstable == QEMU 2.4.1
> > qemu-xen-4.6 == QEMU 2.2.1
> > qemu-xen-4.5 == QEMU 2.0.2
> > 
> > and the change to use --backends was between 2.0.50 and 2.0.90 (AKA
> > 2.1.0-
> > rc0).
> > 
> > Do we require that Xen 4.7 will work with QEMU 2.0.x? Given that AFAICT
> > the
> > oldest QEMU upstream supported version is 2.2.1?
> 
> No, but if somebody wants to use qemu-xen-4.5 with xen-unstable, which
> is not that crazy given that qemu-xen-4.5 is still supported (even
> qemu-xen-4.3 still is), this change in the Makefile would break the
> build.

"supported" is a bit of a stretch IMHO. qemu-xen-4.5 is supported as part
of xen-4.5, not as a standalone independent entity, surely.

>  Anthony's suggestion is a good compromise.

I'd prefer the option given in my second followup suggestion in <1455115410
.19857.167.camel@citrix.com>.

Ian.

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