Re: [uml-devel] Xen 3.0.2 and UML guest

[Michael Richardson <mcr@sandelman.ottawa.on.ca>]

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>>>>> "Blaisorblade" == Blaisorblade  <blaisorblade@yahoo.it> writes:
    >> I built a tree on my laptop as I normally do. It runs etch, and as does my
    >> debian XenU.  With 2.6.15 UML guest on my laptop, everything is fine.
    >> 
    >> Same binary running under a XenU, goes into R state under XenU:

    Blaisorblade> I forget - XenU is an unprivileged guest, and Xen0 is
    Blaisorblade> the main one IIRC  (vaguely) - if that is an
    Blaisorblade> unprivileged guest have you tried on the root one? 
  
  Xen0/Dom0 is the "host" if you like, and XenU/DomU is the "child".

  You are asking if I can run a UML child on the Xen0? I have not tried
it, and I'd have to mess around a bit to do so, but I can try.

    >> 
    >> <BIG PAUSE ******>
    >> 
    >> Linux version 2.6.15 (mcr@marajade.sandelman.ca) (gcc version 4.1.2
    >> 20060901 (pr                      erelease) (Debian 4.1.1-13)) #2 Thu Oct
    >> 19 17:29:21 EDT 2006 Built 1 zonelists

    Blaisorblade> A strace -t (or whichever option shows the timings)
    Blaisorblade> would help finding _where_  
    Blaisorblade> is the big pause...

  I think you mean -T?
  I ran:

strace -f -o /tmp/east.trace -T /0i/sandboxes/UMLPOOL/260ocf/umlbuild/swan26/linux initrd=/0i/sandboxes/UMLPOOL/260ocf/umlbuild/initrd.uml umlroot=/0i/sandboxes/UMLPOOL/260ocf/umlbuild/east/root root=/dev/ram0 rw ssl=pty umid=east $net $UML_DEBUG_OPT $UML_east_OPT  init=/linuxrc $*

  It never actually boots far enough with this option to print anything.

  It was a big message (11MB), so, see
     http://www.sandelman.ca/tmp/xen-uml-50.txt

strace -o /tmp/east.trace -T /0i/sandboxes/UMLPOOL/260ocf/umlbuild/swan26/linux initrd=/0i/sandboxes/UMLPOOL/260ocf/umlbuild/initrd.uml umlroot=/0i/sandboxes/UMLPOOL/260ocf/umlbuild/east/root root=/dev/ram0 rw ssl=pty umid=east $net $UML_DEBUG_OPT $UML_east_OPT  init=/linuxrc $*

without the child tracing, it makes it as it would normally, but we get
nothing about what the child processes are doing, of course.  

I guess maybe that there are problems with the VT ALARMs on the XenU...
Can we build a simpler test case for the Xen folks?

- -- 
]            Bear: "Me, I'm just the shape of a bear."          |  firewalls  [
]   Michael Richardson,    Xelerance Corporation, Ottawa, ON    |net architect[
] mcr@xelerance.com      http://www.sandelman.ottawa.on.ca/mcr/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [


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