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Re: [Qemu-devel] Re: [PATCH] Add support for a configuration file


From: Fabrice Bellard
Subject: Re: [Qemu-devel] Re: [PATCH] Add support for a configuration file
Date: Wed, 14 May 2008 14:26:40 +0200
User-agent: Thunderbird 2.0.0.5 (X11/20070727)

Avi Kivity wrote:
Fabrice Bellard wrote:

I prefer:

drive.file=foo.img
drive.if=scsi


That doesn't support multiple drives very well.

Right, I realized it afterwards !

I suggested it because my original plan for the configuration file was based on this syntax with a strong inspiration from the OpenFirmware device tree. The idea was that the object name ("drive" here) had no hardcoded meaning, except for some predefined object names in order to keep a kind of backward compatibility with the current QEMU options. In order to create a new drive for example, you just have to do:

mydrive.class=drive
mydrive.if=scsi
mydrive.file=abc.img

the "class" field is used to select the device model. Then all the other parameters are used to initialize the device model. That way it is possible to keep the compatibility with the existing options and add a provision to instanciate arbitrary new device models, such as:

mynetworkcard.class="ne2000pci"
mynetworkcard.bus=1 # pci bus selection
mynetworkcard.macaddr=00:01:02:03:04:05
mynetworkcard.vlan=1

I will strongly support configuration file formats having this property.

Regards,

Fabrice.





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