[bug #44026] legacy_configfile fail to boot system with xen pvgrub

[Alexander]

URL:
  <http://savannah.gnu.org/bugs/?44026>

                 Summary: legacy_configfile fail to boot system with xen
pvgrub
                 Project: GNU GRUB
            Submitted by: viliar
            Submitted on: Fri 16 Jan 2015 05:50:04 PM GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Alex
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: 2.02~beta1
         Reproducibility: Every Time
         Planned Release: None

    _______________________________________________________

Details:

I'm trying to replace old pvgrub in xen env with new pvgrub2 and use it for
booting domU with grub2 and grub-legacy inside via universal grub.cfg (search
apropriate config file and then boot system with it). 

According
https://blog.xenproject.org/2015/01/07/using-grub-2-as-a-bootloader-for-xen-pv-guests/
I have compiled grub for i386-xen, x86_64-xen. domU with grub2 booting
correct. But trying to load grub-legacy menu.lst inside domU with
legacy_configfile has been failed:
error: couldn't load file *kernel-version*
error: you need to load the kernel first.

Looks like where is no mapping real device (xen/xvda) with (hd0), so system
cannot boot.
Manual "set root" allow to boot system with legacy_kernel/legacy_initrd (see
bellow)




============================================
Additional system information

dom0: fedora21, xen 4.5.
domU: fedora20/21 (kernel = "/usr/lib/xen/boot/grub-x86_64-xen.bin")

grub: grub-2.02~beta2  
(compiled with CFLAGS="-Wno-error=cpp" ./configure --target=x86_64
--with-platform=xen; make
CFLAGS="-Wno-error=cpp" ./configure --target=i386 --with-platform=xen; make)

pvgrub create: 

grub-bootstrap.cfg:
normal (memdisk)/grub.cfg

test grub.cfg:
set root=(xen/xvda,msdos1)
if search -s -f /boot/grub/menu.lst; then
        legacy_configfile /boot/grub/menu.lst
fi

tar cf memdisk.tar grub.cfg
grub-mkimage -O x86_64-xen -c grub-bootstrap.cfg -m memdisk.tar -o
grub-x86_64-xen.bin /usr/lib/grub/x86_64-xen/*.mod

domU /boot/grub/menu.lst:
title Fedora release 20 (Heisenbug) via grub-legacy config
 root (hd0,0)
 kernel /boot/vmlinuz-3.17.8-200.fc20.x86_64 root=/dev/xvda1 ro
clocksource=xen ipv6.disable=1 biosdevname=0 net.ifnames=0 console=hvc0 
 initrd /boot/initramfs-3.17.8-200.fc20.x86_64.img


Boot error:
  Booting `Fedora release 20 (Heisenbug) via grub-legacy config'

error: couldn't load file /boot/vmlinuz-3.17.8-200.fc20.x86_64.
error: you need to load the kernel first.

Press any key to continue...


Generated config vi legacy_configfile looks this way:

 |set root='(hd0,1)'; set legacy_hdbias='0'                                  
| 
 |legacy_kernel   '/boot/vmlinuz-3.17.8-200.fc20.x86_64'
'/boot/vmlinuz-3.17.\|
 |8-200.fc20.x86_64' 'root=/dev/xvda1' 'ro' 'clocksource=xen'
'ipv6.disable=1\|
 |' 'biosdevname=0' 'net.ifnames=0' 'console=hvc0'                           
|
 |legacy_initrd '/boot/initramfs-3.17.8-200.fc20.x86_64.img'
'/boot/initramfs\|
 |-3.17.8-200.fc20.x86_64.img'                                               
|

Variables:
grub> ls
(memdisk) (proc) (xen/xvda) (xen/xvda,msdos1)
grub> set
?=18
DAY=16
HOUR=17
MINUTE=27
MONTH=1
SECOND=48
WEEKDAY=Friday
YEAR=2015
check_signatures=no
color_highlight=black/light-gray
color_normal=light-gray/black
config_directory=(memdisk)
config_file=(memdisk)/grub.cfg
default=0
feature_200_final=y
feature_all_video_module=y
feature_chainloader_bpb=y
feature_default_font_path=y
feature_menuentry_id=y
feature_menuentry_options=y
feature_nativedisk_cmd=y
feature_ntldr=y
feature_platform_search_hint=y
feature_timeout_style=y
grub_cpu=x86_64
grub_platform=xen
lang=
legacy_hdbias=0
locale_dir=
net_default_ip=(null)
net_default_mac=(null)
net_default_server=
pager=
prefix=(memdisk)/boot/grub
pxe_default_server=
root=hd0,1
secondary_locale_dir=


Manual "set root" allow to boot system with legacy_kernel/legacy_initrd:
grub> set root=(xen/xvda,msdos1)
grub> legacy_kernel '/boot/vmlinuz-3.17.8-200.fc20.x86_64'
'/boot/vmlinuz-3.17.8
-200.fc20.x86_64' 'root=/dev/xvda1' 'ro' 'clocksource=xen' 'ipv6.disable=1'
'bio
sdevname=0' 'net.ifnames=0' 'console=hvc0'
grub> legacy_initrd '/boot/initramfs-3.17.8-200.fc20.x86_64.img'
'/boot/initramf
s-3.17.8-200.fc20.x86_64.img'
grub> boot                  [ initramfs-3.17.8-200  8.92MiB  100%  17.09KiB/s
]
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
...
Fedora release 20 (Heisenbug)
Kernel 3.17.8-200.fc20.x86_64 on an x86_64 (hvc0)

localhost login:
...
============================================


I didn't find workarounds for it yet. Can make some other testing if it
needed. Thank you.



 |                                     




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