[Xen-devel] Re: mini-os: more bugs (was: mini-os: gnttab.c does not compile)

["Robert Kaiser (FH)" <kaiser@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

Hello Gregor

Thanks for your response.

Grzegorz Milos schrieb:
> Hi there
> Thanks for the reports guys.
>
> I'm very busy for the next 2 days, but I will have a look afterwards. 
> My guess is that public xen interfaces changed, which causes our grant 
> table implementation to fail to compile.
> If you remove gnttab.c (together with the init call from kernel.c) 
> then Mini-OS should work just fine.
I switched to xen-3.0.2 for now. The mini-os here does compile, but it 
has some bugs too: Exception handling does not display the correct 
registers and gets into an endless loop. I have developed a patch to fix 
these issues. I suppose it would be best if I "forward-ported" this 
patch to xen-unstable and submit it to you?
Another issue I found is that mini-os blocks its VM when idle (I posted 
a question about this a few weeks ago, but didn't get any response): Xen 
signals timer events to mini-os, but because mini-os is blocked most of 
the time, it misses roughly 99% of those. That is why the periodic 
output of the current time that mini-os is supposed to display does not 
show (actually it would if one were patient enough to wait for a few 
hours or even days..). This could be fixed easily by removing the 
blocking call.
Cheers

Rob

> Cheers
> Gregor
>
> > Hello,
> >
> > sorry to bother you with this: while trying to compile mini-os from
> > xen-unstable.hg, I noticed that compilation failed like this:
> >
> >
> > gcc -fno-builtin -Wall -Werror -Wredundant-decls -Wno-format
> > -Wstrict-prototypes -Wnested-externs -Wpointer-arith -Winline -m32
> > -march=i686 -g -Iinclude  -Iinclude/x86      -Iinclude/x86/x86_32 -c 
> > gnttab.c
> > -o gnttab.o
> > gnttab.c: In Funktion »init_gnttab«:
> > gnttab.c:165: error: request for member `p' in something not a 
> > structure or
> > union
> > make: *** [gnttab.o] Error 1
> >
> > Looking at the source code, I'm not surprised that this happens, and 
> > I suspect
> > that the file of the same name (gnttab.c) found in
> > linux-2.6-xen-sparse/drivers/xen/core will also fail to compile 
> > (though I
> > have not checked this).
> >
> > It seems that the grant-table functions are currently in a 
> > non-functional
> > state and that mini-os does not use these functions anyway (except 
> > for a call
> > to the init function): After commenting out this call, I was able to 
> > build
> > the mini-os binary.
> >
> > Is there a particular reason for this? Can I expect the mini-os to 
> > work after
> > removing gnttab.c?
> >
> >
> > Kind Regards
> >
> > Rob

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