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Re: xen-3.1.0 and dom0 problems with /dev/ksyms



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



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