* Re: [uml-devel] 2.6.9-bs7 panic on check_sysemu
2005-04-05 17:23 ` Rob Landley
@ 2005-04-05 20:54 ` Blaisorblade
2005-04-05 20:55 ` Blaisorblade
2005-04-06 0:24 ` Jeff Dike
2 siblings, 0 replies; 7+ messages in thread
From: Blaisorblade @ 2005-04-05 20:54 UTC (permalink / raw)
To: Rob Landley, Jeff Dike; +Cc: user-mode-linux-devel
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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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [uml-devel] 2.6.9-bs7 panic on check_sysemu
2005-04-05 17:23 ` Rob Landley
2005-04-05 20:54 ` Blaisorblade
@ 2005-04-05 20:55 ` Blaisorblade
2005-04-06 4:59 ` Rob Landley
2005-04-06 0:24 ` Jeff Dike
2 siblings, 1 reply; 7+ messages in thread
From: Blaisorblade @ 2005-04-05 20:55 UTC (permalink / raw)
To: Rob Landley; +Cc: user-mode-linux-devel, Peter
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...
Also, I forgot: during your development work use SKAS. It doesn't give any big
difference visible inside the Virtual Machine (except for bugs).
--
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade
-------------------------------------------------------
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [uml-devel] 2.6.9-bs7 panic on check_sysemu
2005-04-05 20:55 ` Blaisorblade
@ 2005-04-06 4:59 ` Rob Landley
0 siblings, 0 replies; 7+ messages in thread
From: Rob Landley @ 2005-04-06 4:59 UTC (permalink / raw)
To: Blaisorblade; +Cc: user-mode-linux-devel
On Tuesday 05 April 2005 04:55 pm, Blaisorblade wrote:
> > 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...
>
> Also, I forgot: during your development work use SKAS. It doesn't give any
> big difference visible inside the Virtual Machine (except for bugs).
I'm trying out the build on various different systems: knoppix, red hat, suse,
debian. In some cases running on borrowed machines, in other cases running
on a knoppix boot cd. (I care because I'm using the host tools, which vary
slightly from system to system.)
You just suggested that I replace the kernels on all of these systems,
(including other people's machines, and the bootable CD that uses a kernel
with the cloop patch applied and an initramfs that's hard to extract) with a
different kernel. Just so I'm testing something faster that's not actually
what I'm going to be deploying.
If I was going to replace the host kernel and run on a modified system, I'd
just A) replace it with the version I actually need, B) run the build as root
and use chroot instead of UML.
I'm interested in SKAS0 because it's potentially deployable. Any SKAS that
requires a modified host kernel is not, for my purposes.
Rob
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [uml-devel] 2.6.9-bs7 panic on check_sysemu
2005-04-05 17:23 ` Rob Landley
2005-04-05 20:54 ` Blaisorblade
2005-04-05 20:55 ` Blaisorblade
@ 2005-04-06 0:24 ` Jeff Dike
2 siblings, 0 replies; 7+ messages in thread
From: Jeff Dike @ 2005-04-06 0:24 UTC (permalink / raw)
To: Rob Landley; +Cc: user-mode-linux-devel, Blaisorblade, Peter
On Tue, Apr 05, 2005 at 01:23:47PM -0400, Rob Landley wrote:
> 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...
There isn't really one right now. Those patches need to be cleaned up,
merged, and disentanged from other stuff.
Jeff
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^ permalink raw reply [flat|nested] 7+ messages in thread