vnc=1 / pvgrub / close fb: backend at /local/domain/0/backend/vfb/xx/0

[Steven Haigh <netwiz@crc.id.au>]

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Hi all,

I'm toying around with having VNC accessable for some PV guests - but
having a bit of an issue.

1) When vnc is enabled, the grub menu shown via pvgrub stays until a
selection is made on the vnc console. The timeout does not seem to ever
kick in and the DomU more or less sits there churning CPU waiting for a
selection. Once a selection is made, we move to problem #2.

2) When the DomU boots, I see this as one of the last messages before
the DomU kernel takes over:

backend at /local/domain/0/backend/vfb/55/0
/local/domain/0/backend/vkbd/55/0 connected
************************** KBDFRONT
Thread "kbdfront" exited.
/local/domain/0/backend/vfb/55/0 connected
************************** FBFRONT
Thread "kbdfront close": pointer: 0x2200004550, stack: 0x3a30000
close fb: backend at /local/domain/0/backend/vfb/55/0
close kbd: backend at /local/domain/0/backend/vkbd/55/0
  Booting 'Scientific Linux (3.14.21-1.el6xen.x86_64)'

At this point, the VNC server dies and never returns. No VNC connections
are accepted at this point on - and the port (verified via netstat -lnp)
is not open.

I have tried this with both the following layouts of options:
vfb = [ 'type=vnc, vnclisten=192.168.1.1, vncpasswd=supasecret,
vncdisplay=10' ]

and;
vnc             = 1
vnclisten       = "192.168.1.1"

Has anyone had VNC working properly?

# xl info
host                   : xenhost.local
release                : 3.14.20-1.el6xen.x86_64
version                : #1 SMP Mon Oct 6 22:03:42 EST 2014
machine                : x86_64
nr_cpus                : 8
max_cpu_id             : 7
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2327
hw_caps                :
bfebfbff:20000800:00000000:00000900:0004e3bd:00000000:00000001:00000000
virt_caps              : hvm
total_memory           : 20479
free_memory            : 2587
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 4
xen_extra              : .1
xen_version            : 4.4.1
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          :
xen_commandline        : dom0_mem=1G cpufreq=xen dom0_max_vcpus=1
dom0_vcpus_pin console=tty0 console=com1 com1=115200,8n1
cc_compiler            : gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)
cc_compile_by          : mockbuild
cc_compile_domain      : crc.id.au
cc_compile_date        : Tue Oct  7 01:00:52 EST 2014
xend_config_format     : 4


-- 
Steven Haigh

Email: netwiz@crc.id.au
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897


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