Re: [Xen-users] xenfs: not registering fielsystem on no-xen platform

[Juergen Gross <jgross@xxxxxxxx>]

On 11/05/16 17:59, jrun wrote:
> On Wed, May 11, 2016 at 04:16:29PM +0200, Juergen Gross wrote:
>> On 11/05/16 15:59, jrun wrote:
>>> On Wed, May 11, 2016 at 03:37:17PM +0200, Juergen Gross wrote:
>>>> As I suspected: you only boot the kernel. Normally the boot entries
>>>> for Xen are between the lines:
>>>>
>>>> ### BEGIN /etc/grub.d/20_linux_xen ###
>>>> ### END /etc/grub.d/20_linux_xen ###
>>>>
>>>> They look like:
>>>>
>>>> ...
>>>> multiboot /boot/xen.gz ...
>>>> module  /boot/vmlinuz-4.1.20-11-xen ...
>>>> ...
>>>
>>> grub-mkconfig doesn't pick up 20_linux_xen for some reason. looking into
>>> it... thanks.
>>>
>>>> So you are booting the Xen hypervisor which will then start Linux as
>>>> dom0. You'll probably have to install Xen (either from your distribution
>>>> or by building it by yourself).
>>>>
>>>>
>>>> Juergen
>>>
>>> the distro (slackware) has a script for creating xen.gz by calling
>>> mkinitrd.
>>
>> This seems unlikely. mkinitrd is used to build a ramdisk (that's the
>> reason for it's name: MaKe INITial RamDisk). xen.gz should be installed
>> separately, see e.g.
>>
>> https://slackbuilds.org/repository/14.1/system/xen/
> 
> that's what i've been trying; see system/xen/dom0/kernel-xen.sh for the
> mkinitrd call which creates initrd-$KERNEL-xen.gz

Yes. initrd-....

>>> but then when i try to boot off the resulting xen.gz grub says
>>> 'wrong magic number'. can i have something like this:
>>>
>>> multiboot /boot/vmlinuz
>>> module  /boot/vmlinuz
>>>
>>> i.e. can the hypervisor (which btw i understand Xen above to be the
>>> hypervisor) and dom0 be the same kernel image?
>>
>> No, they are built from completely different sources.
> 
> would you care to give me some pointers for building xen.gz? i will have to
> do it myself it seems.

Have a look at http://wiki.xenproject.org/wiki/Compiling_Xen_From_Source


Juergen

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