Re: [Xen-devel] openafs not supported?

[Miroslav Ruda <ruda@xxxxxxxxxxx>]

Steven Hand wrote:
> >  I'm new to Xen world. As the first step I have tried to run debian stable 
> > which I'm running on my testing machine in domain 0 (no xend started yet, no 
> > virtual machines...). I'm using kernel 2.4.29, I have copied .config from my 
> > kernel tree and did "make ARCH=xen oldconfig" etc. Xen version is 2.0.4.
> > Xen and kernel boots OK, but I'm not able to use openafs
> > (1.2.11). Module libafs can be loaded, but afsd generated oops
> > immediately.
> >
> > Is someone runnign openafs with xen? Should I try 2.6 kernel or create more 
> > simple domain 0 linux and run my version in virtual machine?
>
> We have used openafs successfully in the past (with 2.4.x kernels too). 
> > From your somewhat vague description my best guess is that the module
> you're loading is not "xen-enabled" and hence is trying to use ring 0 
> instructions or somesuch. 
That may be source of my problem! I have compiled openafs myself, but just with 
option --with-linux-kernel-headers=/home/ruda/soft-local/xen-2.0/linux-2
.4.29-xen0, which may not be enough, because I didn't specified equivalent of 
ARCH=xen anywhere.
If someone already compiled openafs with xen kernel, could you send me 
suggestions what must be changed in openafs building? Looks like they create
symlinks to several include directories of linux kernel, including 
asm->asm-i386. Would it be enough to change it to asm-xen?
Also if I want to compile openafs for -xenU kernel, I should make it somehow 
"xen-enabled", right?
BTW, I will experiment with arla too, because I was easily able to set ARCH=xen
in Makefiles (they just copy linux subtree, add one subdir and call "make 
modules".


> Can you post the backtrace you get after the module loads? And 
> in fact the boot output you get from Xen and XenLinux? 
I'll try to do it later, I don't have serial console now.

> (also: I presume openafs is known working on your configuration 
> when not using Xen?) 
Yes, this is machine I'm using for my daily work. I just tried to boot 
xen-enabled kernel (vmlinuz-2.4.29-xen0) instead of my linux-2.4.29.
The same root filesystem etc.


--
                  Mirek Ruda


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