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Date: Wed, 27 Nov 2013 16:59:38 +0100
From: Fabio Fantoni <fabio.fantoni@m2r.biz>
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Subject: Re: [Xen-devel] pvgrub2 is merged
References: <527EA084.6000706@gmail.com>	<20131110084753.540b0107@opensuse.site>	<alpine.DEB.2.00.1311131848160.27356@procyon.dur.ac.uk>	<5283DD8F.5080103@gmail.com>	<alpine.DEB.2.00.1311141213350.11266@procyon.dur.ac.uk>	<alpine.DEB.2.00.1311141657530.28334@procyon.dur.ac.uk>	<52850918.1040406@gmail.com>	<alpine.DEB.2.00.1311141835430.28334@procyon.dur.ac.uk>	<52851D28.1090905@gmail.com>	<52851D77.6060203@gmail.com>	<alpine.DEB.2.00.1311142058000.23922@procyon.dur.ac.uk>	<5285440B.2040301@gmail.com>	<5293733B.3090604@m2r.biz>	<alpine.DEB.2.00.1311251913210.16022@procyon.dur.ac.uk>	<5294E157.90708@m2r.biz>
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Il 27/11/2013 12:50, Vladimir 'φ-coder/phcoder' Serbinenko ha scritto:
> On 27.11.2013 12:32, Fabio Fantoni wrote:
>> Il 26/11/2013 19:12, Andrey Borzenkov ha scritto:
>>> В Tue, 26 Nov 2013 18:58:47 +0100
>>> Fabio Fantoni <fabio.fantoni@m2r.biz> пишет:
>>>
>>>> I have also another question:
>>>> Is possible specify multiple path where search the grub.cfg for support
>>>> all mainly distributions and add a custom cfg path support taking it
>>>> from arguments?
>>>>
>>> You can do something like
>>>
>>> if search --set root --file /boot/grub2/grub.cfg ; then
>>>     configfile /boot/grub2/grub.cfg
>>> elif search --set root --file /boot/grub/grub.cfg ; then
>>>     configfile /boot/grub/grub.cfg
>>> elif ...
>>>     ...
>>> fi
>> I tried with this:
>> cat > boot/grub/grub.cfg <<EOF
>> insmod lvm
>> insmod ext2
>> insmod part_msdos
>> insmod part_gpt
>> if search --set root --file /boot/grub2/grub.cfg ; then
>>    configfile /boot/grub2/grub.cfg
>> elif search --set root --file /boot/grub/grub.cfg ; then
>>    configfile /boot/grub/grub.cfg
>> fi
>> EOF
>>
>> But it's not working and it prints this line indefinitely in loop:
>> error: no such device: /boot/grub2/grub.cfg.
>>
> That pretty much explains what happened: you don't have any
> /boot/grub2/grub.cfg and when looking for /boot/grub/grub.cfg GRUB found
> its own memdisk and fell into recursion. I'm not sure what should be the
> proper way to solve this recursion.

Ok, now I understand with this:
cat > boot/grub/grub.cfg <<EOF
insmod lvm
insmod ext2
insmod part_msdos
insmod part_gpt
search -s root -f /boot/grub/grub.cfg
configfile /boot/grub/grub.cfg
EOF

that has the debian grub.cfg path equal to memdisk's grub, and then it 
loads the memdisk ones indefinitely.

Anyone know how to exclude memdisk from the search please?

With this:
cat > boot/grub/grub.cfg <<EOF
insmod lvm
insmod ext2
insmod part_msdos
insmod part_gpt
root='(xen/xvda,msdos1)'
configfile /boot/grub/grub.cfg
EOF

it loads correctly the Sid grub.cfg but grub fails to load with any 
entry I select, that domU stop.

xl -vvv create -c /etc/xen/sid.cfg
...
Caricamento Linux 3.11-1-amd64...
error: not xen image.
Caricamento ramdisk iniziale...
xc: debug: hypercall buffer: total allocations:237 total releases:237
xc: debug: hypercall buffer: current allocations:0 maximum allocations:4
xc: debug: hypercall buffer: cache current size:4
xc: debug: hypercall buffer: cache hits:226 misses:4 toobig:7

Maybe that grub is waiting for a dom0 configuration type (with also 
xen.gz) but find only kernel and ramdisk? (which is right for a domU)

If you need more tests/informations tell me and I'll post them.

Thanks for any reply.

>> I also tried with only these lines instead of conditions:
>> search -s root -f /boot/grub/grub.cfg
>> configfile /boot/grub/grub.cfg
>>
>> But all I get is the line "Welcome to GRUB!" followed by a white screen
>> on xl console.
>>
>> I don't know what else to try :(
>>
>> Thanks for any reply.
>>
>>> If xen provides way to pass arguments to kernel, it sure could be
>>> implemented as arguments to grub. Actually someone asked for a way to
>>> pass arguments to grub on EFI, so this could share implementation.
>>
>