Re: [PATCH] tests/vm: do not specify -bios option

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, Jun 16, 2022 at 12:14:01PM +0200, Paolo Bonzini wrote:
> On 6/16/22 10:44, Daniel P. Berrangé wrote:
> > On Thu, Jun 16, 2022 at 10:30:25AM +0200, Paolo Bonzini wrote:
> > > When running from the build tree, the executable is able to find
> > > the BIOS on its own; when running from the source tree, a firmware
> > > blob should already be installed and there is no guarantee that
> > > the one in the source tree works with the QEMU that is being used for
> > > the installation.
> > I think there is interaction with
> > 
> >    --firmwarepath=/usr/share/qemu-firmware:/usr/share/ipxe/qemu:/usr/share/seavgabios:/usr/share/seabios:/usr/share/sgabios
> > 
> > as the firmware path listed there will be searched before the local
> > build tree.
> > 
> > I agree with your desire to remove the -bios option, but I'm not
> > sure it is entirely safe unless logic in qemu_find_file is fixed
> > to ignore the global search path when running from the build
> > tree.
> 
> Isn't this the same for any other invocation of QEMU, for example in qtest?

Yes, quite likely in fact, so a pre-existing widespread problem and
thus not a reason to avoid this proposed change.

> I admit I didn't think of the interaction with --firmwarepath, but "if it
> hurts, don't do it" might apply here.  That is, install compatible firmware
> to the path _before_ trying to use a QEMU that specifies that path.

I'm mostly thinking of downstream distro developers where they have an
installed QEMU but are working on a build from a different QEMU version.
We can address this separately though

With regards,
Daniel
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