[virt-tools-list] libvirt/virt-manager source integration with xen

[Wayne Mills]

Hi,

I built and installed Xen 4.5.0 from source, on top of Ubuntu 14.04.2,
using "make world" and "make install" targets.  I then installed latest
virt-manager from pre-built packages.  After bringing up virt-manager I
attempt to connect to Xen hypervisor and got:

     unable to connect to libvirt
     Failed to connect socket to /var/run/libvirt/libvirt-sock' No such
file or directory

I then noticed libvirt-bin isn't running.  If I try to issue 'service
libvirt-bin start' it gives me back a process number, but it apparently
dies quickly because the service still shows as down.  Three log files are
touched during my start attempt:

     -rw-r--r-- 1 root      root  39757 Feb 27 06:00
/var/log/xenstored-access.log
     -rw-r--r-- 1 root      root  44908 Feb 27 06:00
/var/log/libvirt/libxl/libxl-driver.log
     -rw------- 1 root      root  46396 Feb 27 06:00
/var/log/libvirt/libvirtd.log

* xenstored-access.log has 22 new entries, grouped into pairs that
increment an  "Axx" identifier and go from A63 to A73.  Here is the A63
logs:

     [20150227T11:00:29.478Z]  A63          newconn
     [20150227T11:00:29.479Z]  A63          endconn

* libxl-driver.log also has 11 log groupings that are just the same set of
logs repeated 11 times.  Here is the first group:

     xc: detail: sysctl operation failed -- need to rebuild the user-space
tool set?
     libxl: error: libxl.c:4320:libxl_get_physinfo: getting physinfo:
Permission denied
     xc: debug: hypercall buffer: total allocations:7 total releases:7
     xc: debug: hypercall buffer: current allocations:0 maximum
allocations:1
     xc: debug: hypercall buffer: cache current size:1
     xc: debug: hypercall buffer: cache hits:6 misses:1 toobig:0

* libvirtd.log also has 11 log groupings, that are just the same set of
logs repeated 11 times.  Here is that group:

     2015-02-27 11:00:29.479+0000: 4842: info : libvirt version: 1.2.2
     2015-02-27 11:00:29.479+0000: 4842: error : libxlDriverConfigNew:1131
: Unable to configure libxl's memory management parameters
     2015-02-27 11:00:29.479+0000: 4842: error : virStateInitialize:749 :
Initialization of LIBXL state driver failed: Unknown problem
     2015-02-27 11:00:29.479+0000: 4842: error : daemonRunStateInit:920 :
Driver state initialization failed

When I google for libxl_get_physinfo I see other reported errors during "xl
info" and other "xl" commands.    I tried "xl info" and that works for me
and does not alter the log files:

root@<server>:~# xl info
host                   : server
release                : 3.13.0-46-generic
version                : #75-Ubuntu SMP Tue Feb 10 15:24:04 UTC 2015
machine                : x86_64
nr_cpus                : 8
max_cpu_id             : 7
nr_nodes               : 2
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2400
hw_caps                :
bfebfbff:2c100800:00000000:00003f00:17bee3ff:00000000:00000001:00000000
virt_caps              : hvm hvm_directio
total_memory           : 98168
free_memory            : 128
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 5
xen_extra              : .0
xen_version            : 4.5.0
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Mon Jan 12 11:30:05 2015 -0500 git:a8ac229
xen_commandline        : placeholder
cc_compiler            : gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
cc_compile_by          : root
cc_compile_domain      : cisco.com
cc_compile_date        : Thu Feb 19 07:26:00 EST 2015
xend_config_format     : 4
root@<server>:~#

After consulting with xen-users mailer, I was given this response by "Ian":

"Did you install libvirt from source or from packages? If the latter then
you may have a disconnect between the packaged version and your
source-built Xen. You'll probably need to rebuild libvirt against your Xen
libraries."

What are the virt-related steps to take to test out Ian's idea?  I have
root access to one machine that serves both as a host to VM's as well as a
build environment for source builds such as this.  I already built xen
4.5.0 and installed it.  Do I now need to separately download and build
libvirt, then download and build virt-manager?  Is it important to place
the virt* code within the xen source tree, or do something else so that the
virt* code compiles "against" an appropriate xen environment?

In summary, I would like some guidance on how to build libvirt, and if
needed, virt-manager, source against a specific Xen version.

Thanks,
Wayne
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