Re: [Xen-devel] [PATCH 1/2] Introduce support for upstream qemu in the xen-unstable build system

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 7 Sep 2011, Ian Campbell wrote:
> On Wed, 2011-09-07 at 10:39 -0400, stefano.stabellini@xxxxxxxxxxxxx
> wrote:
> > In order to distinguish between upstream qemu and qemu-xen I am
> > introducing a new variable named "QEMU" that only if is equal to
> > "upstream" switches the build system to the new qemu.
> 
> Thanks Stefano, this integrated support is overdue.
> 
> Ultimately though I expect we will need a "both" mode since people will
> want old qemu for compatibility with their existing installed guests and
> new qemu for new ones. The allegation (and I don't really know how true
> it is or if it is pessimism or realism) is that some OSes don't cope
> with having the platform components etc changed under them.

Yes. At that point we'll probably have to always build them both,
including two hvmloader...


> > Users that want to try the new qemu just have to export QEMU=upstream
> > before calling make in the xen-unstable top level directory.
> 
> In xl/libxl we call them "qemu-xen-traditional" and "qemu-xen". Perhaps
> we should mirror that nomenclature here?

I looked at libxl but I thought that QEMU=qemu-xen would be confusing for
users/developers.
Like you said, considering that we already have
device_model_version=qemu-xen in VM config files, maybe we should go for
DEVICE_MODEL=qemu-xen?

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