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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] pvgrub2 launch of Xen 4.5.1 DomU just drops to grub2 prompt ?
On 10/20/2015 02:58 AM, Ian Campbell wrote: Where does this file end up? Is it a file within the guest filesystem? The runes here suggest it is part of the host, which doesn't seem right. Once you have started grub in the guest then all of the referenced files need to either be in the guest file system or in a memdisk which you have built into the grub image. Remember, Grub cannot see anything in the dom0 filesystem. I'd suggest exploring what grub can see from the grub prompt using ls on each device etc and try executing variants on the commands which you are embedding as above directly to experiment and find the correct set of things to do. Also, what does grub.cfg within the guest contain? After figuring out that grub2-mkstandalone presumes a '/boot/grub/...' path, and ignores my usage of any other paths, e.g. '/boot/grub2/...', I've managed to get this manually-cobbled config to boot the guest. I'm using a DIY'd pvgrub2 blob; atm, the distro-provided blob fails to launch the guest (ref: http://lists.opensuse.org/opensuse-virtual/2015-10/msg00014.html)
@ Dom0 host, the simplest config that I can get to work is
cd /home/tmp/pvgrub2
cat << EOF > boot/grub/grub.cfg
insmod part_msdos
set root=(xen/xvda,msdos1)
linux /vmlinuz-xen root=/dev/xvdc1 noresume quiet splash=silent
textmode=1 xencons=xvc0 console=hvc0 noirqdebug elevator=noop
initrd /initrd-xen
configfile /boot/grub2/grub.cfg
boot
EOF
Note^^ the specification of symlinks, "vmlinuz-xen & initrd-xen",
grub2-mkstandalone \
--compress=no \
--fonts="unicode" \
--themes="" \
-O x86_64-xen \
-o grub-x86_64-xen \
boot/grub/grub.cfg
With
cat ~/test.cfg
name = 'test'
builder = 'linux'
kernel = '/home/tmp/pvgrub2/grub-x86_64-xen'
disk = [ '/dev/VG0/testBOOT,raw,xvda,backendtype=phy,rw',
'/dev/VG0/testROOT,raw,xvdc,backendtype=phy,rw'
]
vif = [ 'mac=00:16:3E:10:10:01, bridge=br0,
vifname=vifT',]
vfb = [ 'type=vnc, vncdisplay=1001,
vnclisten=127.0.0.1' ]
on_shutdown = 'destroy'
on_reboot = 'restart'
on_crash = 'destroy'
maxmem = 1024
memory = 1024
Guest boot
xl create -c ~/test.cfg
completes
Welcome to openSUSE 13.2 "Harlequin" - Kernel 4.2.3-1.gef1562d-xen
(xvc0).
In the DomU guest
cat /proc/cmdline
root=/dev/xvdc1 noresume quiet splash=silent textmode=1 xencons=xvc0
console=hvc0 noirqdebug elevator=noop
It appears that the cmd line is passed only from the grub2-mkstandalone-created memdisk's embedded grub.cfg, ignoring completely the Guest's 'configfile=/boot/grub2/grub.cfg', which contains,
cat /boot/grub2/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using
templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
if [ -f ${config_directory}/grubenv ]; then
load_env -f ${config_directory}/grubenv
elif [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="${saved_entry}"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_msdos
insmod ext2
set root='hd2,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint='hd2,msdos1'
a1100344-3f89-4c5c-b5c7-7657b9135fc1
else
search --no-floppy --fs-uuid --set=root
a1100344-3f89-4c5c-b5c7-7657b9135fc1
fi
font="/usr/share/grub2/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint='hd0,msdos1'
f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
else
search --no-floppy --fs-uuid --set=root
f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
fi
insmod gfxmenu
loadfont ($root)/grub2/themes/openSUSE/DejaVuSans-Bold14.pf2
loadfont ($root)/grub2/themes/openSUSE/DejaVuSans10.pf2
loadfont ($root)/grub2/themes/openSUSE/DejaVuSans12.pf2
loadfont ($root)/grub2/themes/openSUSE/ascii.pf2
insmod png
set theme=($root)/grub2/themes/openSUSE/theme.txt
export theme
if [ x${boot_once} = xtrue ]; then
set timeout=0
elif [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=8
# Fallback normal timeout code in case the timeout_style
feature is
# unavailable.
else
set timeout=8
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'openSUSE' --class opensuse --class gnu-linux --class gnu
--class os $menuentry_id_option
'gnulinux-simple-a1100344-3f89-4c5c-b5c7-7657b9135fc1' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint='hd0,msdos1'
f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
else
search --no-floppy --fs-uuid --set=root
f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
fi
echo 'Loading Linux 4.2.3-1.gef1562d-xen ...'
linux /vmlinuz-4.2.3-1.gef1562d-xen root=/dev/xvdc1
/dev/xvdc1 noresume splash=silent quiet showopts
echo 'Loading initial ramdisk ...'
initrd /initrd-4.2.3-1.gef1562d-xen
}
submenu 'Advanced options for openSUSE' $menuentry_id_option
'gnulinux-advanced-a1100344-3f89-4c5c-b5c7-7657b9135fc1' {
menuentry 'openSUSE, with Linux 4.2.3-1.gef1562d-xen' --class
opensuse --class gnu-linux --class gnu --class os $menuentry_id_option
'gnulinux-4.2.3-1.gef1562d-xen-advanced-a1100344-3f89-4c5c-b5c7-7657b9135fc1'
{
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root
--hint='hd0,msdos1' f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
else
search --no-floppy --fs-uuid --set=root
f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
fi
echo 'Loading Linux 4.2.3-1.gef1562d-xen ...'
linux /vmlinuz-4.2.3-1.gef1562d-xen root=/dev/xvdc1
/dev/xvdc1 noresume splash=silent quiet showopts
echo 'Loading initial ramdisk ...'
initrd /initrd-4.2.3-1.gef1562d-xen
}
menuentry 'openSUSE, with Linux 4.2.3-1.gef1562d-xen (recovery
mode)' --class opensuse --class gnu-linux --class gnu --class os
$menuentry_id_option
'gnulinux-4.2.3-1.gef1562d-xen-recovery-a1100344-3f89-4c5c-b5c7-7657b9135fc1'
{
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root
--hint='hd0,msdos1' f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
else
search --no-floppy --fs-uuid --set=root
f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
fi
echo 'Loading Linux 4.2.3-1.gef1562d-xen ...'
linux /vmlinuz-4.2.3-1.gef1562d-xen root=/dev/xvdc1
showopts apm=off noresume edd=off powersaved=off nohz=off highres=off
processor.max_cstate=1 nomodeset x11failsafe
echo 'Loading initial ramdisk ...'
initrd /initrd-4.2.3-1.gef1562d-xen
}
menuentry 'openSUSE, with Linux xen' --class opensuse --class
gnu-linux --class gnu --class os $menuentry_id_option
'gnulinux-xen-advanced-a1100344-3f89-4c5c-b5c7-7657b9135fc1' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root
--hint='hd0,msdos1' f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
else
search --no-floppy --fs-uuid --set=root
f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
fi
echo 'Loading Linux xen ...'
linux /vmlinuz-xen root=/dev/xvdc1 /dev/xvdc1
noresume splash=silent quiet showopts
echo 'Loading initial ramdisk ...'
initrd /initrd-xen
}
menuentry 'openSUSE, with Linux xen (recovery mode)' --class
opensuse --class gnu-linux --class gnu --class os $menuentry_id_option
'gnulinux-xen-recovery-a1100344-3f89-4c5c-b5c7-7657b9135fc1' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root
--hint='hd0,msdos1' f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
else
search --no-floppy --fs-uuid --set=root
f8f5e4ca-3f78-4db4-bba5-1a405f896f0a
fi
echo 'Loading Linux xen ...'
linux /vmlinuz-xen root=/dev/xvdc1 showopts apm=off
noresume edd=off powersaved=off nohz=off highres=off
processor.max_cstate=1 nomodeset x11failsafe
echo 'Loading initial ramdisk ...'
initrd /initrd-xen
}
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/20_memtest86+ ###
### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply
type the
# menu entries you want to add after this comment. Be careful not to
change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ];
then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
### BEGIN /etc/grub.d/80_suse_btrfs_snapshot ###
### END /etc/grub.d/80_suse_btrfs_snapshot ###
### BEGIN /etc/grub.d/90_persistent ###
### END /etc/grub.d/90_persistent ###
(1) I don't yet know why the distro-provided pvgrub2 blob is failing to
launch the Xen guest. I suspect bad search/specific paths.
(2) I'm not yet clear how to correctly 'chainload' the DomU Guest's grub.cfg to pick-up kernel cmdline params, &/or support multiple kernels via symlink or version-specific names _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxx http://lists.xen.org/xen-users
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