Christoph Egger wrote:
> On Sunday 15 July 2007 15:52:46 Juraj Hercek wrote:
>   
>> Maybe the unaccessible /dev/ksyms is related to this?:
>> $ sudo xm dmesg | tail -15
>> (XEN) Scrubbing Free RAM: .................done.
>> (XEN) Xen trace buffers: disabled
>> (XEN) Std. Loglevel: Errors and warnings
>> (XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
>> (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
>> input to Xen).
>> (XEN) mm.c:503:d0 Could not get page ref for pfn bff02
>> (XEN) mm.c:2324:d0 Could not get page for normal update
>> (XEN) mm.c:503:d0 Could not get page ref for pfn bff02
>> (XEN) mm.c:2324:d0 Could not get page for normal update
>> (XEN) mm.c:503:d0 Could not get page ref for pfn bff02
>> (XEN) mm.c:2324:d0 Could not get page for normal update
>> (XEN) mm.c:503:d0 Could not get page ref for pfn bff02
>> (XEN) mm.c:2324:d0 Could not get page for normal update
>> (XEN) mm.c:503:d0 Could not get page ref for pfn bff02
>> (XEN) mm.c:2324:d0 Could not get page for normal update
>>
>> Any Idea how to get rid of those "Could not get page ..." things?
>>     
>
> Do you see the '[ Kernel symbol table invalid! ]'  message as I do?
>
> <snippet>
> (XEN) Scrubbing Free RAM 0xffc00000 -> 
> 0xdefb0000: ..............................done.
> (XEN) Xen is relinquishing VGA console.
> (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to 
> Xen).
> (XEN) Freed 116kB init memory.
> [ Kernel symbol table invalid! ]       <----
> Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
>     2006, 2007
>     The NetBSD Foundation, Inc.  All rights reserved.
> Copyright (c) 1982, 1986, 1989, 1991, 1993
>     The Regents of the University of California.  All rights reserved.
> </snippet>
>   

No. Output is exactly as I've specified above, maybe the difference is 
in dom0 kernel - I've used custom one, not the XEN3_DOM0 one from NetBSD 
distribution (everything built from NetBSD current updated on July 1st).

> Good to know that it works with xen-3.0.3. Does it work for you, with 
> xen-3.0.4 hypervisor?
>   

Yes. xen 3.0.4 (xen-3.0.4-1.gz - downloaded from 
http://bits.xensource.com/oss-xen/release/3.0.4-1/bin.tgz/xen-3.0.4_1-install-x86_32.tgz) 
works fine, I opened /dev/ksyms and read symbols.

> I think, the libelf work done in the hypervisor by linux distributors broke 
> bsd. BSD_SYMTAB is no longer handled correctly.
> The elf_load_binary() function in xen/common/libelf/libelf-loader.c in
> the hypervisor is the responsible one which loads the Dom0 image.
>   
I see, hopefully the fix will be included in next xen hypervisor release.

--
Juraj