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Re: [Xen-devel] pvgrub2 is merged

From: Fabio Fantoni
Subject: Re: [Xen-devel] pvgrub2 is merged
Date: Thu, 28 Nov 2013 15:17:48 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.1.1

Il 28/11/2013 15:05, Vladimir 'φ-coder/phcoder' Serbinenko ha scritto:
On 28.11.2013 14:07, Fabio Fantoni wrote:
Il 27/11/2013 18:35, Andrey Borzenkov ha scritto:
В Wed, 27 Nov 2013 17:24:53 +0100
Fabio Fantoni <address@hidden> пишет:

Il 27/11/2013 17:03, Vladimir 'φ-coder/phcoder' Serbinenko ha scritto:
On 27.11.2013 16:59, Fabio Fantoni wrote:
Il 27/11/2013 12:50, Vladimir 'φ-coder/phcoder' Serbinenko ha scritto:
That pretty much explains what happened: you don't have any
/boot/grub2/grub.cfg and when looking for /boot/grub/grub.cfg GRUB
its own memdisk and fell into recursion. I'm not sure what should
be the
proper way to solve this recursion.
Yes, it was a bit naive on my side. Recursion in principle can be
stopped by using global variable, but search is limited to the first
match only anyway, so I guess it is not worth it.

Anyone know how to exclude memdisk from the search please?
Please look in grub2 sources at docs/osdetect.cfg. It implements
advanced run-time detection of possible bootable files from
various operating systems. It boils down to loop across all devices,
and of course you can either limit device names (like looking for hd*
only) or explicitly exclude known ones (like memdisk).

Is it possible to specify a different default grub.cfg path (different
from all other distributions) changing this command:
./grub-mkstandalone --grub-mkimage=./grub-mkimage -o pvgrub2.xen -O
x86_64-xen -d grub-core/ boot/grub/grub.cfg
Is it hardcoded as /boot/grub/grub.cfg for grub memdisk or can be set?

Not really. Currently the situation is

- grub-mkstandalone hardcodes $prefix as (memdisk)/boot/grub
- after launch grub unconditionally starts "normal" module if at all
- normal module always tries to load and execute $prefix/grub.cfg if no
    explicit configuration file name is given as argument

But I think that using osdetect.cfg or something based on this idea
won't require changing defaults at all.
Thanks for your reply.

I did this script that is working about finding and include the grub.cfg
of pv domUs with many cases:

cat > boot/grub/grub.cfg <<EOF
insmod lvm
insmod ext2
insmod part_msdos
insmod part_gpt
insmod btrfs

insmod regexp
for dev in (*); do
     # $device: parenthesis removed from $dev
     regexp -s device '\((.*)\)' $dev
     set root=$device
     for file in /boot/vmlinuz-* /boot/linux-*; do
         if test -f $file; then
             set saved_root=$root
set root=$saved_root

if test -f /boot/grub2/grub.cfg ; then
     configfile /boot/grub2/grub.cfg
elif test -f /boot/grub/grub.cfg ; then
     configfile /boot/grub/grub.cfg

@xen developer: Are there other modules to insert for other partitions
or file systems, other grub cfg path for other distributions or other
kernel type to search that support xen pv domUs?
I think is good do and post complete pvgrub2 cfg that support all pv domUs.

@xen and grub developer: I'm still unable to boot any entry of Sid pv
domU using official kernel:
xl -vvv create -c /etc/xen/sid.cfg
Caricamento Linux 3.11-1-amd64...
Caricamento ramdisk iniziale...
xc: debug: hypercall buffer: total allocations:247 total releases:247
xc: debug: hypercall buffer: current allocations:0 maximum allocations:4
xc: debug: hypercall buffer: cache current size:4
xc: debug: hypercall buffer: cache hits:236 misses:4 toobig:7

Any ideas?

Ah I forgot: you need to "insmod xzio" since debian ones are compressed.
If you need more tests/informations tell me and I'll post them.

Thanks for any reply.

Thanks for reply, in the meantime I rebuilt updated grub2 from git (commit b67422d33de8eee83700db534a45b2ac5e5ed67a) and there is a regression from build of some days ago (I don't remember the exact commit, probably was of 24 or 25 november).
Fails on script I posted on previous mail showing some errors:
kern/dl.c:619: module name: test
kern/dl.c:620: init function: 0x3f5abdd4
error: two arguments expected.
commands/wildcard.c:164: Regexp is ^vmlinuz-.*$
commands/wildcard.c:164: Regexp is ^linux-.*$
error: two arguments expected.
commands/wildcard.c:164: Regexp is ^vmlinuz-.*$
commands/wildcard.c:164: Regexp is ^linux-.*$
error: two arguments expected.
commands/wildcard.c:164: Regexp is ^vmlinuz-.*$
commands/wildcard.c:164: Regexp is ^linux-.*$

Full log with debug on attachment.

Attachment: pvgrub2.log
Description: Text document

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