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

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

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As a side note to this - if I use pygrub as a bootloader vs using
pvgrub, then VNC works perfectly.

So, what options exist to make pvgrub behave properly for booting with
VNC enabled?

On 22/10/2014 2:17 AM, Steven Haigh wrote:
> 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
> 
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
> 

-- 
Steven Haigh

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


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