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Re: [Xen-devel] Xen Paravirt Operations Domain 0 Serial Console Problem

To: pasik@xxxxxx
Subject: Re: [Xen-devel] Xen Paravirt Operations Domain 0 Serial Console Problem
From: "Mr. Teo En Ming (Zhang Enming)" <enming.teo@xxxxxxxxxxxxxxx>
Date: Tue, 25 Aug 2009 02:06:41 +0800
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Dear Pasi,

How do I disable the VGA display adapter? Stop the vga card kernel module from loading? Add it to /etc/modprobe.d/blacklist.conf? Under pv-ops dom 0, there is no nouveau kernel module. And nvidia kernel module cannot work in pv-ops dom 0 too.

How do I disable all the various tty from 1 to 7?

I still need to leave ttyS0 enabled, as I need the serial console.

As for hiding vga card from dom 0, I cannot use pciback as I am using pv-ops dom 0. I need to use pci-stub.

--
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering) 
BEng(Hons)(Mechanical Engineering)
Technical Support Engineer
Information Technology Department
Asiasoft Online Pte Ltd
Tampines Central 1 #04-01 Tampines Plaza
Singapore 529541
Republic of Singapore
Mobile: +65-9648-9798
MSN: teoenming@xxxxxxxxxxx
Alma Maters: Singapore Polytechnic, National University of Singapore



On 08/25/2009 01:57 AM, Pasi Kärkkäinen wrote:
On Tue, Aug 25, 2009 at 01:34:54AM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
Dear Pasi,

Thanks for your help! It works!

I wonder why this didn't work:

title Fedora (2.6.31-rc6-enming.teo) Serial Console
         root (hd0,0)
         kernel /xen.gz iommu=1 com1=115200,8n1 console=com1
         module /vmlinuz-2.6.31-rc6-enming.teo ro
root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=ttyS0,115200
         module /initrd-2.6.31-rc6-enming.teo.img

And this worked:

title pv_ops dom0-test (2.6.29-rc7-tip) with serial console
         root (hd0,0)
         kernel /xen-3.3.gz dom0_mem=1024M loglvl=all guest_loglvl=all
         com1=19200,8n1 console=com1
         module /vmlinuz-2.6.29-rc7-tip ro root=/dev/vg00/lv01 console=hvc0
         earlyprintk=xen
         module /initrd-2.6.29-rc7-tip.img

Anyway, I still got a tty1 output! I thought that after using serial
console, it is not supposed to output to a monitor anymore?

Well you still haven't disabled the VGA display adapter..
And most probably you still have gettys configured aswell.

As a result of this, I still can't hide the VGA card from dom 0 and pass it
through to the Windows Dom U.

See: http://wiki.xensource.com/xenwiki/VTdHowTo

Especially the section "Binding at Boot-Time".

-- Pasi

Any ideas?

--
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering)
BEng(Hons)(Mechanical Engineering)
Technical Support Engineer
Information Technology Department
Asiasoft Online Pte Ltd
Tampines Central 1 #04-01 Tampines Plaza
Singapore 529541
Republic of Singapore
Mobile: +65-9648-9798
MSN: teoenming@xxxxxxxxxxx
Alma Maters: Singapore Polytechnic, National University of Singapore



On 08/25/2009 12:44 AM, Pasi Kärkkäinen wrote:
On Tue, Aug 25, 2009 at 12:17:53AM +0800, Mr. Teo En Ming (Zhang Enming)
wrote:

Hi All,

I have tried to configure serial console for Xen hypervisor, dom 0
kernel and Linux login but it does not seem to be working.

Here is my grub configuration for serial console:

title Fedora (2.6.31-rc6-enming.teo) Serial Console
         root (hd0,0)
         kernel /xen.gz iommu=1 com1=115200,8n1 console=com1
         module /vmlinuz-2.6.31-rc6-enming.teo ro
root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=ttyS0,115200
         module /initrd-2.6.31-rc6-enming.teo.img


http://wiki.xensource.com/xenwiki/XenParavirtOps

paste from that page:


Working example grub.conf with serial console output:

title pv_ops dom0-test (2.6.29-rc7-tip) with serial console
         root (hd0,0)
         kernel /xen-3.3.gz dom0_mem=1024M loglvl=all guest_loglvl=all
         com1=19200,8n1 console=com1
         module /vmlinuz-2.6.29-rc7-tip ro root=/dev/vg00/lv01
         console=hvc0 earlyprintk=xen
         module /initrd-2.6.29-rc7-tip.img



Is the above configuration correct? On my Intel Desktop Board DQ45CB, I
have a COM1 header on the PCB and I have connected an external serial
port to this header and also enabled COM1 in the BIOS.

After selecting the above entry in GRUB still on VGA, a cursor at the
top left corner of the monitor shows up, which means Xen and Dom 0
kernel are booting up on the serial console and not on VGA.

However, after some time, a login prompt finally displays on my VGA
monitor! Isn't it NOT supposed to show up on VGA and should show up in
serial console instead?


You also need to have the gettys configured properly.

-- Pasi







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