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

[Rob Landley <rob@landley.net>]

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... :)

Rob


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