Re: [Xen-users] Unable to reboot after install of Xen on fresh ubuntu running off recycled macbook hardware

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

You should add the options to the grub config at the end of the line
which currently reads:

        module  /vmlinuz-3.16.0-25-generic placeholder 
root=/dev/mapper/ubuntu--vg-root ro
        
IOW it should now read:

        module  /vmlinuz-3.16.0-25-generic placeholder 
root=/dev/mapper/ubuntu--vg-root ro debug console=hvc0
        
Ian.

On Wed, 2014-12-03 at 08:21 -0600, Marco Blanchette wrote:
> Thanks Ian,
> 
> Just to be clear (sorry, it's my first adventure playing with low
> level kernel services...), the debug console=hvc0 argument should be
> added to the Grub config? As is? Any where?
> 
> I also have no clue how to check wether a console is attached to hvc0,
> perhaps someone could suggest a path of actions?
> 
> Thanks
> 
> Sent from my iPad
> 
> Marco Blanchette, Ph.D.
> Genomic Scientist
> Stowers Institute for Medical Research
> 1000 East 50th St.
> Kansas City, MO 64110
> 
> Tel: 816-926-4071 
> Cell: 816-726-8419 
> Fax: 816-926-2018
> 
> > On Dec 3, 2014, at 3:36 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > 
> > If it's hanging after loading the initramfs then that suggests that
> > either userspace isn't starting, or that its output is not going to the
> > console.
> > 
> > You could try adding "debug console=hvc0" to the kernel module of the
> > Xen entry, which might give you some output or some more hints at least.
> > 
> > You should also make sure that a getty is configured to run on hvc0 once
> > the system is booted. I've no idea even which initsystem Ubuntu 14.10
> > uses, so I'm not sure of the way one does that...
> > 
> > Ian.
> > 
> >> On Tue, 2014-12-02 at 20:51 -0600, Marco Blanchette wrote:
> >> 
> >> Dear list,
> >> 
> >> 
> >> In my attempt to solve this problem, I went ahead and compile a fresh
> >> download of Xen 4.5 from GitHub and install it on my MacBook hardware
> >> running a Vanilla Ubuntu 14.10 as sole OS. Results are the same, Iâm
> >> unbable to load the kernel on top of Xen. My effort in trying to tweak
> >> Grub2 were all unsuccessful so I am doubting this is the problem.
> >> 
> >> 
> >> Any help would be appreciated.
> >> 
> >> 
> >> thanks
> >> 
> >> 
> >> 
> >>> On Nov 25, 2014, at 6:56 PM, Marco Blanchette
> >>> <marcoblanchette@xxxxxx> wrote:
> >>> 
> >>> Hmmâ. Here is the menu entry for Ubuntu GNU/Linux, with Xen
> >>> hypervisor for /boot/grub/grub.cfg (not /boot/grub2â that directory
> >>> does not exist on my Unbuntu distro)
> >>> 
> >>> 
> >>> menuentry 'Ubuntu GNU/Linux, with Xen hypervisor' --class ubuntu
> >>> --class gnu-linux --class gnu --class os --class xen
> >>> $menuentry_id_option
> >>> 'xen-gnulinux-simple-858436db-0198-4d51-9d7f-8a0a4603eb7a' {
> >>>        insmod part_gpt
> >>>        insmod ext2
> >>>        set root='hd0,gpt2'
> >>>        if [ x$feature_platform_search_hint = xy ]; then
> >>>          search --no-floppy --fs-uuid --set=root
> >>> --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2
> >>> 8a1f5b8a-1c17-434e-930e-d1687be8b6f4
> >>>        else
> >>>          search --no-floppy --fs-uuid --set=root
> >>> 8a1f5b8a-1c17-434e-930e-d1687be8b6f4
> >>>        fi
> >>>        echo    'Loading Xen 4.4-amd64 ...'
> >>>        if [ "$grub_platform" = "pc" -o "$grub_platform" = "" ];
> >>> then
> >>>            xen_rm_opts=
> >>>        else
> >>>            xen_rm_opts="no-real-mode edd=off"
> >>>        fi
> >>>        multiboot       /xen-4.4-amd64.gz placeholder
> >>> ${xen_rm_opts}
> >>>        echo    'Loading Linux 3.16.0-25-generic ...'
> >>>        module  /vmlinuz-3.16.0-25-generic placeholder
> >>> root=/dev/mapper/ubuntu--vg-root ro
> >>>        echo    'Loading initial ramdisk God damn it!!!!...'
> >>>        module  --nounzip   /initrd.img-3.16.0-25-generic
> >>>        echo    'I'\''m passed loading the RAM disk'
> >>> 
> >>> 
> >>> }
> >>> 
> >>> 
> >>> Thanks for looking into this (I added the extra echo lines in my
> >>> effort to figure out what was going on hereâ)
> >>> 
> >>> 
> >>> 
> >>> 
> >>> 
> >>> 
> >>>> On Nov 25, 2014, at 6:47 PM, Manoj Subramaniam
> >>>> <Manoj.Subramaniam@xxxxxxxxxx> wrote:
> >>>> 
> >>>> I suspect your menu entry for "Ubuntu GNU/Linux (kernel
> >>>> 3.16.0-25-generic [or -0-23-]) , with Xen hypervisorâ is
> >>>> incorrect. Did you run grub2-mkconfig? Verify the menu entry
> >>>> in /boot/grub2/grub.cfg .
> >>>> 
> >>>> 
> >>>> From: Marco Blanchette <marcoblanchette@xxxxxx>
> >>>> Date: Tuesday, November 25, 2014 at 7:15 AM
> >>>> To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
> >>>> Subject: [Xen-users] Unable to reboot after install of Xen on
> >>>> fresh ubuntu running off recycled macbook hardware
> >>>> 
> >>>> 
> >>>> 
> >>>> I'm pretty newbie with Xen and I appologize if this is something
> >>>> that is easy and dumb... 
> >>>> 
> >>>> I just install a fresh vanilla ubuntu 14.10 server, followed by a
> >>>> distribution upgrade. Ubuntu is installed on a recycled macbook
> >>>> air late 2010 [MacBook Air "Core 2 Duo" 2.13 13" (Late â10) 2.13
> >>>> GHz Core 2 Duo (SL9600) to be precise] on a 25 Gb root partition
> >>>> with the remaining of the 250Gb SSD hard drive for LVM. Grub2 is
> >>>> the boot loader. 
> >>>> 
> >>>> I then installed Xen 4.4 from the distro with sudo apt-get install
> >>>> xex-hypervisor-4.4-amd64
> >>>> 
> >>>> Upon reboot of the Ubuntu GNU/Linux (kernel 3.16.0-25-generic [or
> >>>> -0-23-]) , with Xen hypervisor in Grub (v 2.02 ~ beta2-15), the
> >>>> boot process get stuck after echoing "Loading initial ramdiskâ.
> >>>> I also tried Ubuntu 14.04.01 LTS server with the two different
> >>>> kernels with no avail.
> >>>> 
> >>>> I suspect the problem is with the Grub configs but Iâm not sure
> >>>> where to go from there to start figuring out what the problem is.
> >>>> 
> >>>> Any help would be really appreciate.
> >>>> 
> >>>> Thanks
> >>>> _______________________________________________
> >>>> Xen-users mailing list
> >>>> Xen-users@xxxxxxxxxxxxx
> >>>> http://lists.xen.org/xen-users
> >> 
> >> 
> >> _______________________________________________
> >> Xen-users mailing list
> >> Xen-users@xxxxxxxxxxxxx
> >> http://lists.xen.org/xen-users
> > 
> > 
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-users



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