Re: [Xen-users] Booting pv-ready distro installer.iso as Xen PV DomU drops to grub prompt?

[lyndat3@xxxxxxxxxxxxx]

Hi Sarah

On Thu, Apr 9, 2015, at 06:36 PM, Sarah Newman wrote:
> If you trust the opensuse installer enough to load it within the context of 
> the dom0, there is
> nothing wrong with loading the installer kernel and ramdisk directly. You can 
> switch back to grub2
> after the installation.

The whole goal & idea of pvgrub2 is to to have the DomU use its own kernels 
etc.  Less of an issue when all Dom0 & DomUs are the same OS, but here they 
will not be ...

What I 'trust' is the DomU's intent.  I.e., its own kernel/initrd, etc

Of course that assumes I can get this working.

> >     error: file `/boot/x86_64/grub2-efi/x86_64-xen/echo.mod' not found.
> >     error: can't find command `linuxefi'.
> >     error: file `/boot/x86_64/grub2-efi/x86_64-xen/echo.mod' not found.
> >     error: can't find command `initrdefi'.
> 
> 
> EFI https://en.wikipedia.org/wiki/Extensible_Firmware_Interface doesn't make 
> sense here.

I admit to being new to UEFI, and figuring it out as I go.

This is my 1st UEFI box.  It was enough of a challenge figuring out how to get 
Xen to chainload via grub2 via UEFI.  That finally works now; obviously, as I'm 
booted.

> Only the 'linux' and 'initrd' commands for loading are supported without 
> extra patches. Is there any
> other grub.cfg on the iso?

There's only this

find . | egrep "\.cfg"
 ./boot/x86_64/loader/gfxboot.cfg
 ./boot/x86_64/loader/isolinux.cfg
 ./EFI/BOOT/grub.cfg


> > (1) How do I get the DomU config to recognize the configfile without 
> > forcing a visit to the grub prompt?
> > (2) Not sure what to do about the missing linuxefi/initrdefi/echo.mod ...
> 
> Look at grub(2)-mkstandalone. It makes a ramdisk that includes a config file 
> (you should put it at
> the default path for your grub build) and by default also includes all 
> modules. But that won't add
> support for linuxefi and initrdefi because those aren't valid commands for 
> xen.

That's what /usr/lib/grub2/x86_64-xen/grub.xen is supposed to be

 rpm -q --whatprovides /usr/lib/grub2/x86_64-xen/grub.xen
  grub2-x86_64-xen-2.02~beta2-20.5.1.x86_64

As you can see  in the .spec file

  
https://build.opensuse.org/package/view_file/openSUSE:13.2/grub2/grub2.spec?expand=1
 

grub.xen is built with "grub-mkstandalone"

./grub-mkstandalone --grub-mkimage=./grub-mkimage -o grub.xen -O 
%{_target_cpu}-xen -d grub-core/ "/boot/grub/grub.cfg=./grub.cfg"

Iiuc, this ^^ should be do-able, so I'm sticking with it.

LT


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