After more investigation, it seems the bug is in neither with kvm nor
vgabios.  The problem seems to be with the way libvirt is invoking
kvm/qemu.

Trying to install Fedora 9 onto a VM using virt-install results in the
"Attempted DOS System Call" error, but I can manually create the VM
without virt-install and the installer works fine.

Manual Steps:

1. I created the disk image:

  qemu-img create fedora.img 2G

2. I booted the ISO using kvm directly:

  kvm -cdrom Fedora-9-i386-disc1.iso -boot d fedora.img

In case the problem was with virt-install and not libvirt, I tried
modifying the XML defining my fedora VM manually so it booting from the
ISO... and again, same "Attempted DOS System Call" error, which again
suggest the bug is in libvirt.

The sf bug #1977971 regarding kvm makes it clear that this is not really
a bug but an issue of incorrect invocation. Perhaps a workaround will be
added to kvm, but libvirt should be fixed to invoke it correctly.

-- 
unable to boot linux vm's that are not Debian derived.
https://bugs.launchpad.net/bugs/220463
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