Re: [Xen-devel] dom0 kenrel crashes for openstack + libvirt + libxl

[Xing Lin <linxingnku@xxxxxxxxx>]

Hi,

I git clone nova-juno from github and searched for 'pygrub'. Here is what i get.Â

.//etc/nova/rootwrap.d/compute.filters:104:# nova/virt/xenapi/vm_utils.py: 'pygrub', '-qn', dev_path

.//etc/nova/rootwrap.d/compute.filters:105:pygrub: CommandFilter, pygrub, root

.//nova/tests/unit/virt/xenapi/test_xenapi.py:667: Â Â Â Âself.assertEqual(self.vm['PV_bootloader'], 'pygrub')

.//nova/virt/xenapi/vm_utils.py:298: Â Â Â Â Â Ârec['PV_bootloader'] = 'pygrub'

It seems that nova does not specify absolute path for pygrub.Â

I checked libvirt source code and found the following definition.

.//src/libxl/libxl_conf.h:52:# define LIBXL_BOOTLOADER_PATH BINDIR "/pygrub"

Searched further for difinition of BINDIR revealed the followings.Â

Xing:libvirt-1.2.2 xing$ grep BINDIR -Rn ./

.//ChangeLog:48645: ÂSBINDIR "/libvirtd"

.//ChangeLog:48646: ÂSBINDIR "/libvirtd_dbg"

.//build-aux/ltmain.sh:2408: Â-bindir BINDIR Â Âspecify path to binaries directory (for systems where

.//gnulib/lib/Makefile.in:2499: Âecho '#define BINDIR "$(bindir)"'; \

.//gnulib/lib/Makefile.in:2500: Âecho '#define SBINDIR "$(sbindir)"'; \

.//gnulib/lib/gnulib.mk:303: Âecho '#define BINDIR "$(bindir)"'; \

.//gnulib/lib/gnulib.mk:304: Âecho '#define SBINDIR "$(sbindir)"'; \

I guess BINDIR was pointed to /usr/bin.Â

-XingÂ

On Thu, Nov 20, 2014 at 2:30 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

On Wed, 2014-11-19 at 11:57 -0700, Xing Lin wrote:
> Hi Ian,
>
>
> Both of your two points are valid. There is no need to install
> virt-manager. And the patch to start a qemu process in /etc/init.d/xen
> seems to be enough for launching instances from horizon. I have
> updated the wiki page. Please review it at
>
> http://wiki.xenproject.org/wiki/Xen_via_libvirt_for_OpenStack_juno

Looks much better, thanks!

I think the need to symlink pygrub to /usr/bin should be considered an
openstack bug. I presume nova specifies the absolute path, when it
should just say "pygrub" by default and let the toolstack find the
default one.

Ian.

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