On Thursday 01 March 2007 22:23, Russell Robinson wrote: > Hi, > > This is a list of what I've learned so far about UML. > > I'm simply posting this so that it gets into the archive and may help > other people. > > If any experts see anything wrong, please post a correction... > > 1. UML is great. Thanks to Jeff and BlaisorBlade and everyone > else involved.
Thanks a lot, it is nice to see our work is useful to people. Working on it is fun, but knowing this helps doing the non-funny things. > 2. The site http://user-mode-linux.sourceforge.net is essential, but > a lot of information is out of date and therefore either wrong > for later kernels or just confusing. The following points list > specific things in relation to this. > Take what you read with a "grain of salt". > 3. Recent kernels (from which version???) *do not* need a UML patch Since 2.6.11 - the patch was merged in 2.6.9 but critical bugs existed. > to compile and run as a guest. Briefly, "make ... ARCH=um" > is the important part when compiling and kernel. > 4. Recent kernels run SKAS0 by default, SKAS3 if the host > kernel has support for it. The boot log *no longer* tells > you what mode it is running. Argh! It should - otherwise you're hitting a bug I guess. > You can force "tt" mode > if you want when you start the UML kernel: "mode=tt" option. I know no situation where it is recommended. Currently mode=tt cannot be compiled in and soon it will disappear from UML sources, I guess. > 5. If you run certain distributions on your host, you may find > it *very* hard or impossible to find a SKAS3 patch > from http://www.user-mode-linux.org/~blaisorblade/patches/ > that will patch the kernel to allow SKAS3 mode in your guests. > For example, my host is Centos 4.4, which is a > 2.6.9.who-knows-what-else kernel (i.e. Centos do back-ports > from later kernels without updating the .9). I have > tried almost every SKAS3 patch and cannot find > any that will patch the kernel source. > So, I'm running SKAS0, the default, for now... They are intended for vanilla kernels, and I think I've warned about this somewhere - and I'm always open about suggested improvements to it (since I know there is info but not always where it should). It is not difficult to port the SKAS patch to any given 2.6 kernel, it's just boring and time-consuming. -- Inform me of my mistakes, so I can add them to my list! Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
