Re: [Xen-devel] pvgrub2 is merged

[Vladimir 'Ï-coder/phcoder' Serbinenko <phcoder@xxxxxxxxx>]

On 27.11.2013 16:59, Fabio Fantoni wrote:
> Il 27/11/2013 12:50, Vladimir 'Ï-coder/phcoder' Serbinenko ha scritto:
>> On 27.11.2013 12:32, Fabio Fantoni wrote:
>>> Il 26/11/2013 19:12, Andrey Borzenkov ha scritto:
>>>> Ð Tue, 26 Nov 2013 18:58:47 +0100
>>>> Fabio Fantoni <fabio.fantoni@xxxxxxx> ÐÐÑÐÑ:
>>>>
>>>>> 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)
> 
No, this message indicates problem parsing domU image. Can you give the
link to exact image you use?
> 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.
>>>
>>
> 
>

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