Perhaps grepping for CONFIG_XEN_DOM0=y in the boot/config-XX would
validate the dom0 kernel compatibility better then looking for -xen in
the name.
-Bruce
-Bruce
On Wed, May 19, 2010 at 10:07 AM, Richie <listmail@xxxxxxxxxxxx
<mailto:listmail@xxxxxxxxxxxx>> wrote:
Perhaps it goes without saying, but I don't think my suggestion
for a xen in the image name check will be an accurate solution for
someone that does not roll their own kernels. I always know that
my kernels have xen in the name when they are pvops/dom0 capable
and sxen when they are Xenlinux. Also, technically, for Xenlinux
kernels, grub should not be generating bare metal boot entries.
If anything, this could also be used as a basis for a script that
generates an initial 40_custom file. That can then be hand edited
before running update-grub.
Bruce Edge wrote:
Good points all. Will incorporate, retest and repost the
resultant script.
Thanks
-Bruce
On Tue, May 18, 2010 at 5:24 PM, Richie <listmail@xxxxxxxxxxxx
<mailto:listmail@xxxxxxxxxxxx> <mailto:listmail@xxxxxxxxxxxx
<mailto:listmail@xxxxxxxxxxxx>>> wrote:
I like the idea myself and I haven't seen anything in the
wiki's
other than manual creation steps.
Just an opinion here, but why not use "dummy=dummy" as
opposed to
first parameter duplication? My understanding is that dummy is
used to avoid this same bug. Either way we it avoids having to
hardcode root= into the kernel cmdline .config parameter :) I
don't know if parameter duplication would break things when the
bug is fixed or not, but the dummy parameter shouldn't. I also
think it might be viewed as something more familiar,
perhaps self
explanatory, whereas the parameter duplication may cause
confusion.
I skimmed the code and have not tested it. I don't see
that it is
specifically trying to ensure that the kernel is Xenlinux or
pvops... Not that I know of a proper way to do such or if its
even pratical. Aren't most kernels now pvops (thus
bootable under
xen) but not necessarily dom0 capable? I think a spin on this
would be if one wanted to limit the Xen entries to kernels with
"xen" (ie. --append-to-version) in the name. Perhaps the code
would change as follows?
<snip>
list=`for i in /boot/vmlinu[xz]-*xen* /vmlinu[xz]-*xen* ; do
if grub_file_is_not_garbage "$i" ; then echo -n "$i "
; fi
done`
<snip>
Bruce Edge wrote:
If this has already been done, please forgive me.
However, if
not, I'd like to submit this as a mechanism for
generating a
bootable grub2 stanza for hypervisors.
As the /etc/grub.d/* files rely on defaults in
/etc/default/grub, I added the following Xen specific
variable:
GRUB_CMDLINE_XEN_DEFAULT="console=com1 115200,8n1
dom0_mem=512M dom0_max_vcpus=1 dom0_vcpus_pin=true
iommu=1,passthrough,no-intremap loglvl=all loglvl_guest=all
loglevl=10 debug acpi=force apic=on apic_verbosity=verbose
numa=on"
The script itself is a hacked version of the10-linux that
comes with grub2. This is 09-xen so it places it's boot
entries ahead of the non-xen entries.
The resulting grub.cfg entry looks like:
### BEGIN /etc/grub.d/09_xen ###
insmod lvm
set root=(system-dom0_0)
menuentry "Xen osa-dom0 6.0.13-05, linux 2.6.32.12" {
multiboot /boot/xen.gz /boot/xen.gz console=com1
115200,8n1 dom0_mem=512M dom0_max_vcpus=1
dom0_vcpus_pin=true
iommu=1,passthrough,no-intremap loglvl=all loglvl_guest=all
loglevl=10 debug acpi=force apic=on
apic_verbosity=verbose numa=on
module /boot/vmlinuz-2.6.32.12
/boot/vmlinuz-2.6.32.12
root=UUID=a3764d7d-6292-4f08-8ece-480e54c77229 ro
earlyprintk=xen loglevel=10 debug acpi=force
console=hvc0,115200n8
module /boot/initrd.img-2.6.32.12
/boot/initrd.img-2.6.32.12
}
### END /etc/grub.d/09_xen ###
Note the duplication of the first params. I believe
there's a
bug that drops the 1st param so this could be changed
later.
#! /bin/sh -e
prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
. ${libdir}/grub/update-grub_lib
if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
OS=GNU/Linux
else
OS="${GRUB_DISTRIBUTOR}"
fi
# Source grub defaults
. /etc/default/grub
# loop-AES arranges things so that /dev/loop/X can be
our root
device, but
# the initrds that Linux uses don't like that.
case ${GRUB_DEVICE} in
/dev/loop/*|/dev/loop[0-9])
GRUB_DEVICE=`losetup ${GRUB_DEVICE} | sed -e
"s/^[^(]*(\([^)]\+\)).*/\1/"`
;;
esac
if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [
"x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
|| ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}"
; then
LINUX_ROOT_DEVICE=${GRUB_DEVICE}
else
LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
fi
test_gt ()
{
local a=`echo $1 | sed -e
"s,.*/vmlinu[zx]-,,g;s/[._-]\(pre\|rc\|test\|git\|old\)/~\1/g"`
local b=`echo $2 | sed -e
"s,.*/vmlinu[zx]-,,g;s/[._-]\(pre\|rc\|test\|git\|old\)/~\1/g"`
if [ "x$b" = "x" ] ; then
return 0
fi
dpkg --compare-versions "$a" gt "$b"
return $?
}
find_latest ()
{
local a=""
for i in $@ ; do
if test_gt "$i" "$a" ; then
a="$i"
fi
done
echo "$a"
}
list=`for i in /boot/vmlinu[xz]-* /vmlinu[xz]-* ; do
if grub_file_is_not_garbage "$i" ; then echo -n
"$i " ; fi
done`
while [ "x$list" != "x" ] ; do
linux=`find_latest $list`
echo "Found linux image: $linux" >&2
basename=`basename $linux`
dirname=`dirname $linux`
rel_dirname=`make_system_path_relative_to_its_root
$dirname`
version=`echo $basename | sed -e "s,^[^0-9]*-,,g"`
alt_version=`echo $version | sed -e "s,\.old$,,g"`
linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"
initrd=
for i in "initrd.img-${version}" "initrd-${version}.img" \
"initrd.img-${alt_version}"
"initrd-${alt_version}.img"; do
if test -e "${dirname}/${i}" ; then
initrd="$i"
break
fi
done
if test -n "${initrd}" ; then
echo "Found initrd image: ${dirname}/${initrd}" >&2
else
# "UUID=" magic is parsed by initrds. Since there's no
initrd, it can't work here.
linux_root_device_thisversion=${GRUB_DEVICE}
fi
cat << EOF
insmod lvm
set root=(system-dom0_0)
menuentry "Xen ${OS}, linux ${version}" {
multiboot /boot/xen.gz /boot/xen.gz
$GRUB_CMDLINE_XEN_DEFAULT
module ${rel_dirname}/${basename}
${rel_dirname}/${basename}
root=${linux_root_device_thisversion}
$GRUB_CMDLINE_LINUX_DEFAULT
EOF
if test -n "${initrd}" ; then
cat << EOF
module ${rel_dirname}/${initrd}
${rel_dirname}/${initrd}
EOF
fi
cat << EOF
}
EOF
list=`echo $list | tr ' ' '\n' | grep -vx $linux | tr
'\n' ' '`
done
-Bruce
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