This cost me something like 10′ of google search and 15′ troubleshooting. Writing it down so that it can cost the next person just 2′ of google search 
Setting RedHat Enterprise Linux 6 (hereby RHEL6) as a paravirtualized guest is well documented. However the virt-install command generates a 404 error when run on an Oracle VM server. I used tcpdump(8) to promptly discover that virt-install attempts to retrieve /images/xen/vmlinuz instead of the proper /isolinux/vmlinuz. Clickety-click:
# pwd
/opt/oracle/usr/lib/python2.4/site-packages/virtinst
# diff ParaVirtGuest.py ParaVirtGuest.py.orig
90c90
kernel = grabber.urlopen("%s/images/xen/vmlinuz"
92c92
initrd = grabber.urlopen("%s/images/xen/initrd.img"
104,105c104,105
< kernel = open("%s/isolinux/vmlinuz" %(nfsmntdir,), "r")
kernel = open("%s/images/xen/vmlinuz" %(nfsmntdir,), "r")
> initrd = open("%s/images/xen/initrd.img" %(nfsmntdir,), "r")
Then firing up virt-install again did the trick (remember to choose a suitable mirror):
# virt-install -n centos6 -r 2048 -f /OVS/publish_pool/centos6.disk.0 \ --os-type=linux --vnc -p -l \ http://ftp.ntua.gr/pub/linux/centos/6/os/x86_64/ -b br0 -d
Extra notes: [1] [2]. I only used ext2 for the /boot filesystem but YMMV.
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