Re: [uml-devel] 2.6.9-bs7 panic on check_sysemu

[Blaisorblade <blaisorblade@yahoo.it>]

On Tuesday 05 April 2005 19:23, Rob Landley wrote:
> On Monday 04 April 2005 09:32 am, Blaisorblade wrote:
> > > Is this a case where I should be upgrading my host kernels (will do
> > > that in time anyway)?

> > You simply need to update the SKAS patch version. -V2 is very old, and
> > many bugs (including this, that is a bug in the SYSEMU part of the SKAS
> > patch). Upgrading to -V7 for the SKAS patch, even on the same host kernel
> > version (i.e. against 2.6.8.1), would fix that.

> > Also, some older guest kernels may seem to work, because they don't
> > diagnose such bugs. But actually they have problems in some situations,
> > because of the host bugs. For instance panicking with a simple "echo 0 >
> > /proc/sysemu; echo 1 > /proc/sysemu".

> > > Or is there something that can be done on the guest to make it work on
> > > older kernels also?

> > Not a lot, except disabling SYSEMU (and its performance advantage)
> > entirely - add the "nosysemu" param to the UML command line and it will
> > work.

> > But it won't be as slow as if you didn't use SKAS.

> > Bye

> Speaking of which, I ask this from time to time:

> What's the minimal patch set that _just_ adds -SKAS0 mode to something like
> a 2.6.11 kernel?  I'd like to try it out, but every time I sit down to
> whack at it my interest budget runs out sifting through a mountain of
> unrelated x86-64 patches to try to figure out what exactly I need to apply
> to get just SKAS0...

> No biggie.  I'll can always ask again later... :)

The problem is that I don't use the Jeff's tree nor work on SKAS0, since 
somebody must work on current releases.

While Jeff is loaded with development work and cannot handle every user. I too 
have sometimes problem to keep in touch with him.

That said, check if applying the whole tree (until the point patches apply) 
works for you.
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade




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