Re: [Xen-devel] problem using compiled kernel -- Sisu

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 02/08/2010 14:21, "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx> wrote:

> Hi Keir,
> 
> I haven't got a machine with xen-unstable nor grub2 at the moment.
> Perhaps Pasi has and could test it ?

If someone can test it this week then it can go in the next release
candidate for 4.0.1.

 K.

> --
> Sander
> 
> 
> 
> Wednesday, July 28, 2010, 9:49:42 AM, you wrote:
> 
>> Ah yes, that could work. I applied a possible fix for GRUB2 handlign as
>> xen-unstable:21883. It works on the assumption that the loader name for
>> GRUB2 is of the form "GRUB 1.xx". I print out the loader name as one of the
>> first things during boot now, so it'd be good if someone could confirm that
>> the loader name does look like that, and that we now correctly handle GRUB2
>> command lines. Since I do not have GRUB2 installed.
> 
>> If it works okay, I'll backport it for 4.0.1.
> 
>>  Thanks,
>>  Keir
> 
>> On 27/07/2010 22:59, "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx> wrote:
> 
>>> Don't know if the bootloader name in the multiboot specs contains the grub
>>> version number .. so it perhaps could be derived from there ?
>>> 
>>> http://www.gnu.org/software/grub/manual/multiboot/multiboot.html#Boot-inform
>>> at
>>> ion-format
>>> 
>>> See flag 9
>>> 
>>> --
>>> Sander
>>> 
>>> 
>>> Tuesday, July 27, 2010, 11:09:29 PM, you wrote:
>>> 
>>>> On 27/07/2010 21:37, "Pasi Kärkkäinen" <pasik@xxxxxx> wrote:
>>> 
>>>>>> what info are missing?
>>>>>> 
>>>>> 
>>>>> You're missing the fact that grub2 is broken..
>>>>> Please read grub2 related entries from:
>>>>> http://wiki.xensource.com/xenwiki/XenCommonProblems
>>> 
>>>> This is a tricky issue actually. Strictly it is Xen which throws away the
>>>> first parameter on each command line. This is because the Multiboot
>>>> protocol
>>>> behaviour, as established by GRUB1, is that the command line passed to us
>>>> includes the name of the kernel binary (e.g. xen.gz loglvl=all
>>>> sync_console)
>>>> and so we strip that off. But GRUB2 has arbitrarily changed behaviour to
>>>> only pass parameters in the command-line string. Hence lopping the first
>>>> item in the string actually lops a parameter. The workaround is to stick
>>>> something dummy as the first parameter, such as a period. This behaviour
>>>> change between GRUB1 and GRUB2 is a pain in the arse.
>>> 
>>>>  -- Keir
>>> 
>>>>>>>> (XEN) Command line: loglvl=all guest_loglvl=all sync_console
>>>>>>>> console_to_ring com1=115200,8n1 console=com1
>>>>> 
>>>>> See, dom0_mem is missing from there..
>>>>> The same thing happens with dom0 kernel, you lose the first parameter
>>>>> (console=hvc0).
>>>>> 
>>>>> -- Pasi
>>>>> 
>>>>> 
>>>>> 
>>>>> _______________________________________________
>>>>> Xen-devel mailing list
>>>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>>>> http://lists.xensource.com/xen-devel
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
> 
> 
> 
> 



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