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cat boot/grub2/grub.cfg

root='(xen/xvda)' <-----

configfile /boot/grub2/grub.cfg

your root is actually at

(xen/xvda,msdos1)

since you use partitions in each device. I usually don't.

When you drop to a shell during the boot attempt, try and browse around and you should see all the partitions:

>ls

== all the partitions ==

>root=(xen/xvda,msdos1)

>ls /

list of files in /boot

PryMar56

On Saturday, October 17, 2015 12:37 PM, PGNet Dev <pgnet.dev@xxxxxxxxx> wrote:

I'm running a Xen 4.5.1 Dom0

    xl info | egrep "release|machine|xen_version"
        release : 4.2.3-3.g9c478b9-xen
        machine : x86_64
        xen_version : 4.5.1_10-389

on Opensuse host

    lsb_release -rd
        Description: openSUSE 13.2 (Harlequin) (x86_64)
        Release: 13.2

I'm revisiting booting a DomU using pvgrub2 (instead of usual 'pygrub')

Piecing together info & procedures from

    http://wiki.xenproject.org/wiki/PvGrub2
    https://blog.xenproject.org/2015/01/07/using-grub-2-as-a-bootloader-for-xen-pv-guests/
    http://lists.xenproject.org/archives/html/xen-users/2015-04/msg00046.html
    http://www.hellion.org.uk/blog/posts/debian-pvgrub2/
    https://tech.mendix.com/linux/2014/09/06/pvgrub2/

I create a standalone pvgrub2 binary

    cd /home/tmp/pvgrub2
    mkdir -p boot/grub2

    cat boot/grub2/grub-xen-pvgrub2.cfg
        search -s root -f /boot/grub2/grub.cfg
        configfile /boot/grub2/grub.cfg

    cat boot/grub2/grub.cfg
        root='(xen/xvda)'
        configfile /boot/grub2/grub.cfg

    grub2-mkstandalone \
    -o grub-x86_64-xen \
    -O x86_64-xen \
    boot/grub2/grub-xen-pvgrub2.cfg

    /usr/bin/tree
        .
        âââ boot
        â âââ grub2
        â âââ grub.cfg
        âââ grub-x86_64-xen

Reference it in a Xen cfg

    cat test.cfg
        name = 'test'
        builder = 'linux'
        kernel = /home/tmp/pvgrub2/grub-x86_64-xen
        disk = [ 'phy:/dev/vg0/BOOT,xvda,w', 'phy:/dev/vg0/ROOT,xvdc,w' ]
        root = '/dev/xvdc1'
        vif = [ 'mac=00:16:3E:10:10:01, bridge=br0, vifname=vifT' ]
        extra = 'textmode=1 xencons=xvc0 noirqdebug elevator=noop console=hvc0'
        maxmem = 1024
        memory = 1024

On DomU launch, it drops to a grub prompt

    ls -al /var/log/xen
        (empty)
    xl create -c test.cfg

        --------------------------------------------------------------
        GNU GRUB version 2.02~beta2

        Minimal BASH-like line editing is supported. For the first word, TAB
        lists possible command completions. Anywhere else TAB lists possible
        device or file completions.

        grub>
        --------------------------------------------------------------

and sits

At another shell to Dom0

    xl list
        Name ID Mem VCPUs State Time(s)
        Domain-0 0 2984 1 r----- 31.1
        msg 10 1024 1 r----- 4.0

    ls -al /var/log/xen
        -rw-r--r-- 1 root root 0 Oct 17 12:18 qemu-dm-test.log
        -rw-r--r-- 1 root root 0 Oct 17 12:18 xen-hotplug.log
        -rw-r--r-- 1 root root 51 Oct 17 12:18 xl-test.log

    cat /var/log/xen/xl-test.log
        Waiting for domain test (domid 10) to die [pid 10230]

What's missing or wrong in my Dom0's pvgrub2 launch config? Is the

    root='(xen/xvda)'

specification in

    boot/grub2/grub.cfg

incorrect?

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Re: [Xen-users] pvgrub2 launch of Xen 4.5.1 DomU just drops to grub2 prompt ?