Re: /dev/ksyms under Xen-4.7

[Roger Pau Monn? <roger.pau%citrix.com@localhost>]

On Wed, Oct 05, 2016 at 11:25:39AM +0200, Roger Pau Monn? wrote:
> On Tue, Oct 04, 2016 at 08:45:01PM -0400, Brian Marcotte wrote:
> > > To which previous version? Do you mean that reverting 
> > > ed04ca95981f539fec7b9d242d0ca0176e92cc23 only solves the problem? I've tried 
> > > it, and the result seems to be the same AFAICT.
> > 
> > Xen 4.7 has xen/common/libelf/libelf-loader.c dated 2016-04-01. If I
> > replace it with the previous version dated 2015-07-30 it works. I did
> > not revert the other change in that commit.
> 
> I assume that the version dated 2015-07-30 means that you reverted only this 
> file to the state it was in commit 598fbeb9c1bd7b32a3c435913a382911cd68319b?
> 
> I've done that and I'm still seeing the same issue, i386 PAE DomUs are not 
> able to load the symbol table. Can you please explain how you did that 
> revert?

I've just tried the version of Xen packaged in Debian Jessie, which is 
4.4.1, and I'm still seeing the same error, so I'm quite sure it's not 
caused by those commits:

# xl create -c netbsd.cfg
Parsing config from netbsd.cfg
[ Kernel symbol table invalid! ]
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 7.99.39 (INSTALL_XEN3PAE_DOMU.201610032340Z)
total memory = 1024 MB
avail memory = 991 MB
cpu_rng: RDRAND
mainbus0 (root)
hypervisor0 at mainbus0: Xen version 4.4.1
vcpu0 at hypervisor0
vcpu0: Intel(R) Core(TM) i3-5010U CPU @ 2.10GHz, id 0x306d4
xenbus0 at hypervisor0: Xen Virtual Bus Interface
xencons0 at hypervisor0: Xen Virtual Console Driver
xenbus: can't get state for device/suspend/event-channel (2)
xennet0 at xenbus0 id 0: Xen Virtual Network Interface
xennet0: MAC address 00:16:3e:2e:a2:a9
balloon0 at xenbus0 id 0: Xen Balloon driver
balloon0: current reservation: 1048576 KiB
boot device: <unknown>
root on md0a dumps on md0b
root file system type: ffs
kern.module.path=/stand/i386/7.99.39/modules
warning: no /dev/console
xennet0: using RX copy mode
xenbus: can't get state for device/suspend/event-channel (2)
balloon0: current reservation: 262144 pages => target: 262145 pages
balloon0: memory 'hot-plug' unsupported - clipping reservation 1 => 0 pages.
balloon0: WARNING: balloon could not reach target 262145 (current 262144)
ignore shutdown request:
Created tmpfs /dev (1654784 byte, 3200 inodes)

This is using the daily snapshot from:

http://nyftp.netbsd.org/pub/NetBSD-daily/HEAD/201610032340Z/i386/binary/kernel/netbsd-INSTALL_XEN3PAE_DOMU.gz

At this point I'm not really sure if this is an issue in NetBSD or Xen, 
because I'm not able to bisect the Xen tree from such older commits, and I'm 
not able to install anything older than 4.4 because of the systemd mess...

Roger.