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Re: [Qemu-devel] Using iPXE with older qemu releases?

From: Kenton Cabiness
Subject: Re: [Qemu-devel] Using iPXE with older qemu releases?
Date: Tue, 27 Sep 2011 12:50:00 -0500
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0.2) Gecko/20110902 Thunderbird/6.0.2


On 9/27/2011 2:23 AM, Stefan Hajnoczi wrote:
On Mon, Sep 26, 2011 at 02:22:21PM -0500, Kenton Cabiness wrote:
Is there a way to point an older qemu release (currently running
qemu-kvm- to iPXE products?

We have built iPXE and installed the files and tested by changing
the symbolic links in /usr/share/qemu-kvm (RH6.1 system) to point to
the iPXE files.  We would like to package the files in an RPM for
installation on several machines, but since the links are owned by
the qemu-kvm package, we cant have the iPXE package overwrite them.

Is there a command line argument to qemu to point to a different
directory for iPXE?  I've been looking through the code but can't
find what tells qemu where to pick up the files.
Try -device virtio-net-pci,romfile=/path/to/ipxe.rom,... as part of your
command-line.  If you have trouble getting this working, please post
your full command-line.

Alternatively use -option-rom /path/to/ipxe.rom.  Either method should
Thanks for the reply. Unfortunately, neither of these works for us. We are using libvirt to configure and start up our VMs and it doesn't support the romfile= option (we've got a fairly robust configuration with 16 NICs using bridges, so I don't really want to try configuring everything manually and wouldn't fly with our project anyway).

The -option-rom method works somewhat (we are using it to load sgabios, so I know the arguments are being recognized). The value doesn't seem to override the default path for the romfile for the NIC. If I remove the gpxe rom file from the default directory (or make it 0 length), then it fires off the iPXE PXEboot almost immediately (much faster than normal), but it can't communicate with the external DHCP server. If I let it fail a couple of times and then reset the VM, then it launches iPXE and everything works correctly, so I'd say that something isn't getting initialized correctly if the load of the default romfile fails.

Thanks again for the info.

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