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Date: Fri, 16 Oct 2009 12:16:30 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 0/4] QemuOpts: config file support.
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: qemu-devel@nongnu.org

> What I really want to do, which I don't think is possibly in right now, is:
>
> [net "default"]
> type=tap
> script=/etc/qemu-ifup-bridge
>
> In /etc/qemurc to globally change from slirp default to tap default. Of
> course, why stop there, we should install an /etc/qemurc by default with:
>
> [net "default"]
> type=user
> host=10.0.1.2
> net=10.0.1.0/24
> dhcpstart=10.0.1.10
> dns=10.0.1.2
>
> And completely get rid of any baked in defaults.

Yes.  Kill all these automagic devices from qemu, move them into config 
files.  So long-term we'll have something like:

/usr/share/qemu/boards/pc.dtc
         -> your virtual mainboard, i.e. all piix3/4 and core stuff
            like pic, apic, ...

/usr/share/qemu/defaults/pc.conf
         -> useful default configuration for pc, i.e. cirrus vga,
            e1000 nic, serial port, parallel port, cdrom drive, ...

/etc/qemu/host.conf
         -> host-wide config, i.e. slirp networking, maybe chardevs
            for serial0+parallel0, ...

$HOME/.qemu.conf (maybe)
         -> user-wide config

qemu would (by default) read all these files in the specified order, 
additionally a virtual-machine config file specified on the command 
line.  Asking qemu to NOT read defaults/pc.conf would zap all default 
devices from your configuration.

Maybe it is useful to have some kind of profiles, i.e.
/etc/qemu/default.conf, /etc/qemu/nographic.conf, ...

cheers,
   Gerd