[Xen-devel] Excellent work; some questions, observations

[John Joganic <jej@xxxxxxxxxxxxx>]

Congratulations on your release!  Between Slashdot and the bittorrent, I 
imagine this will get a lot of attention.
I booted from the CD and toyed around creating various domains... this 
worked just fine.  I also copied the images to my boot partition and 
successfully booted my development machine using Xen.  Some minor tweaks 
to XF86Config and X was running, too.
What I wasn't able to do was replicate the environment of the CD 
sufficiently to get a domain running.  xenctl works, and I can create a 
domain, but when running the newdomain script, it would fail when 
mapping the cdrom_link.  Apparently a control file in /var/lib/xen 
dealing with virtual devices is missing.  I'm away from that machine at 
the moment, so I don't have the exact name but it was something like 
vdstat.xml if memory serves.  Perhaps that's enough to go on.  The 
documentation on the CD is good, but perhaps I missed the full details 
on setting this up in a bootable fashion without fdisk'ing my machine 
first.  I'm running RH8.0 on that machine with the following GRUB entry:
title Xen - XenoLinux (2.4.22)
    kernel /xenimage.gz dom0_mem=131072 ser_baud=115200 noht
    module /xenolinux.gz root=/dev/sda2 ro console=tty0

I renamed image.gz as I already have one.  Everything worked that I 
expected. Lots of warnings, but not a big deal.  Any plans for IPv6?
Finally, the CD has a lot of... questionable items on it.  I suppose 
this comes from the original bootable linux project.  You might consider 
omitting the exploits directory in the future.  It feels wrong.  And it 
doesn't correlate with your stated objective.
Otherwise, outstanding work.  I've been working on a lightweight 
operating system that requires resource isolation, and Xen solves many 
of my problems, particularly in testing.
Anybody considering work on a single-step debugger/monitor for a domain? 
 That would make ring 0/1 OS debugging _very_ interesting.
John Joganic



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