[uml-devel] Porting UML to other plattforms

[uml-devel] Porting UML to other plattforms

[Joerg Hoh]

Hi

Can someone tell me, how hard is the job to port UML to other plattforms
than i386 (how far went the ppc port?). I have here an alpha machine and I
want to do some testing of kernels and kernel related stuff (selinux)
without the need for rebooting the machine for testing kernels.

I've done a simple test and found out, that I need at least some very
lowlevel kernel stuff. Can someone give me some hints to documentation
and/or people who could help me?

Joerg

-- 
Joerg Hoh


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Re: [uml-devel] Porting UML to other plattforms

[Henrik Nordstrom]

On Sat, 6 Dec 2003, Joerg Hoh wrote:

> Can someone tell me, how hard is the job to port UML to other plattforms
> than i386 (how far went the ppc port?).

Good question indeed.

In theory a sub-arch port should not be that difficult if you know the
basics characteristics of the architecture, but there is always
complications.

Regards
Henrik



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Re: [uml-devel] Porting UML to other plattforms

[Jeff Dike]

joerg@devone.org said:
> Can someone tell me, how hard is the job to port UML to other
> plattforms than i386 (how far went the ppc port?).

In principal, it shouldn't be too hard.  In practice, the immature arch 
abstraction layer inside UML is a problem, but this should be improved once
I get the x86_64 port merged.

More troublesome are are host-specific problems.  Every architecture that UML
has run on has exposed toolchain problems of one sort or another.  Host kernel
and hardware bugs are also somewhat common.  These are what will hold up any
new port, rather than any problems with UML itself.

				Jeff



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Re: [uml-devel] Porting UML to other plattforms

[Joerg Hoh]

On Mon, Dec 08, 2003 at 03:42:48PM -0500, Jeff Dike wrote:
> joerg@devone.org said:
> > Can someone tell me, how hard is the job to port UML to other
> > plattforms than i386 (how far went the ppc port?).
> 
> In principal, it shouldn't be too hard.  In practice, the immature arch 
> abstraction layer inside UML is a problem, but this should be improved once
> I get the x86_64 port merged.

Good News.

> More troublesome are are host-specific problems.  Every architecture that UML
> has run on has exposed toolchain problems of one sort or another.  Host kernel
> and hardware bugs are also somewhat common.  These are what will hold up any
> new port, rather than any problems with UML itself.

How does a hardware bug affect UML? The bugs should be "fixed" by the host
kernel and therefore noone should see them (expect some very lowlevel
software and the kernel). Can you explain this point to me?

Jörg

-- 
...Wenn man sich bei NetBSD auf eines verlassen kann, dann: Egal, WAS[...]
man updated, mplayer hat mit Sicherheit dependencies drauf.
  Rene Schickbauer, news:2591532.ZKZXAUW3eG@gandalf.grumpfzotz.org


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Re: [uml-devel] Porting UML to other plattforms

[Jeff Dike]

joerg@devone.org said:
> How does a hardware bug affect UML? The bugs should be "fixed" by the
> host kernel and therefore noone should see them (expect some very
> lowlevel software and the kernel). Can you explain this point to me? 

If the host kernel (or its maintainer) hasn't seen the bug yet, it's hard
to work around it.

And sometimes there is no workaround.  You need to fix the chip.

				Jeff



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