Re: [Xen-devel] GRUB2 missing multiboot2 patches?Re: Only 1 CPU was detected

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Sep 29, 2017 at 11:49:39AM +0100, Michael Young wrote:
> 
> 
> On Thu, 28 Sep 2017, Hongjiang Zhang wrote:
> 
> > > -----Original Message-----
> > > From: Stefan Bader [mailto:stefan.bader@xxxxxxxxxxxxx]
> > > Sent: Friday, September 29, 2017 4:49 AM
> > > To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>; Hongjiang Zhang
> > > <honzhan@xxxxxxxxxxxxx>
> > > Cc: Juergen Gross <jgross@xxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx
> > > Subject: Re: GRUB2 missing multiboot2 patches?Re: [Xen-devel] Only 1 CPU
> > > was detected
> > > 
> > > On 28.09.2017 16:03, Konrad Rzeszutek Wilk wrote:
> > > > On Thu, Sep 28, 2017 at 02:45:38PM +0000, Hongjiang Zhang wrote:
> > > > > > > (XEN) ACPI Error (tbxfroot-0218): A valid RSDP was not found
> > > > > > > [20070126]
> > > > > > 
> > > > > > Uuh, that is rather bad, I guess.
> > > > 
> > > > I am going to assume this is due to not having:
> > > > 
> > > > b4d709b6e Use grub-file to figure out whether multiboot2 should be
> > > > used for Xen.gz a8e0f1adf Fix util/grub.d/20_linux_xen.in: Add
> > > > xen_boot command support for aarch64
> > > > 
> > > > In the grub that he is using (Ubuntu?)
> > > > 
> > > > In other words he is using 'multiboot' instead of 'multiboot2'
> > > > 
> > > If this is Ubuntu, my expectation is that this would require Xen 4.9 
> > > (which is
> > > part of 17.10 but not yet released) and work on grub2 (which I  will very
> > > unlikely have the time for). Debian has not yet moved to Xen 4.9, so I 
> > > would
> > > doubt that it would work there either.
> > > 
> > If Xen 4.9 does not work either, shall I try CentOS 7.13 instead? Or which 
> > Linux distribution is recommended?
> 
> I think Fedora 27 (currently in beta) is almost there (for x86_64 anyway).
> It does have xen 4.9, but some manual steps are needed to get grub2 working
> using multiboot2. These are
> 
> * edit the grub.cfg file to use multiboot2 and module2 rather than multiboot
> and module

It won't generate the stanza.
> * install the grub2-efi-x64-modules package and copy multiboot2.mod and
> relocator.mod from /usr/lib/grub/x86_64-efi to
> /boot/efi/EFI/fedora/x86_64-efi/ (which you probably need to create)
> * add insmod multiboot2 to the relevant section in the grub.cfg file with
> the other insmod lines.
> 
> Also watch out for useless sections in the grub.cfg file for a xen config
> file rather than for xen itself.

Sadly not there as the ARM changes broke x86, see:

https://bugzilla.redhat.com/show_bug.cgi?id=1486002

> 
> I recently got xen working doing the above including running a domU guest,
> but gdm didn't start and I haven't had a chance to work out if that is
> related or not.
> 
>       Michael Young

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