[libvirt] [PATCH v2] qemu: Allow UEFI paths to be specified at compile time

[Daniel P. Berrange]

On Wed, Dec 03, 2014 at 02:17:48PM +0100, Gerd Hoffmann wrote:
> On Mi, 2014-12-03 at 12:43 +0000, Daniel P. Berrange wrote:
> > On Wed, Dec 03, 2014 at 01:35:18PM +0100, Gerd Hoffmann wrote:
> > >   Hi,
> > > 
> > > > Hmm, so it occurrs to me that this is really about detecting what
> > > > BIOS capabilities QEMU is able to support.
> > > 
> > > IMHO this isn't a property of qemu, but a property of the firmware.
> > > 
> > > Thats why I think the firmware packages should include some config file
> > > with the meta data.
> > 
> > It feels related to QEMU because you need to have info about whether
> > to use -bios or -pflash,
> 
> That again depends on the firmware (whenever it wants store state in
> flash or not) not qemu.
> 
> > and info about the format raw vs qcow2
> 
> Again depends on the firmware.  -pflash accepts any blockdev, so we can
> use qcow2 there, which could be useful for the largely empty vars file,
> especially for arm where it is 64M in size.
> 
> > and
> > whether the firmware is compatible with the particular system emulator
> > arch.
> 
> That needs to be in the firmware metadata anyway, qemu wouldn't
> magically know this either.
> 
> > The location of the firmware and/or firmware config files can vary
> > depending on what $PREFIX QEMU was installed in.
> 
> I don't want that.  Well, the images itself should be
> in /usr/share/$package.  But for the firmware config file I want a fixed
> location, not something depending on the qemu $prefix.
> 
> > I don't think that
> > external apps should have to care about where the firmware or the
> > firmware config files are installed - that's QEMU's build time knowledge.
> 
> Firmware is *not* built together with qemu.

It is installed together with it. eg if I do

 ./configure --prefix=$HOME/qemu-git && make install

then all the firmware goes into $HOME/qemu-git/share/qemu. I wouldn't
expect a QEMU in $HOME/qemu-git/bin/qemu-system-x86_64 to use the
firmware from /usr/share

Regards,
Daniel
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