Re: [Xen-devel] [PATCH] libxl: use qemu-xen with PV guests by default

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2012-04-18 at 16:35 +0100, Stefano Stabellini wrote:
> On Wed, 18 Apr 2012, Ian Campbell wrote:
> > On Tue, 2012-04-17 at 18:17 +0100, Ian Jackson wrote:
> > > Stefano Stabellini writes ("[Xen-devel] [PATCH] libxl: use qemu-xen with 
> > > PV guests by default"):
> > > > qemu-xen offers better disk performances than qemu-xen-traditional
> > > > because it supports Linux native AIO.
> > > 
> > > Does this take any account of whether the new qemu-xen dm is
> > > installed ?
> > 
> > I don't think it is possible to install xen-unstable without
> > qemu-upstream-xen getting built and installed? At least not building
> > from source, perhaps a distro might package them separately but there
> > really ought to be a depends relationship in that case?
> 
> I would think so.
> 
> > Would we want to
> > support a Xen without qemu-upstream-xen configuration?
> 
> What if we check for the existence of the file in libxl?
> 
> If this is not acceptable I vote for assuming that qemu-xen is installed
> in the system.

I think an access(R_X) check or whatever + log and ERROR_INVAL would be
find.

Ian.



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