Re: [Xen-devel] I only see one CPU core on Xen when booted via grub

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.01.18 at 18:28, <msd+xen-devel@xxxxxx> wrote:
> I only see 1 CPU core on Xen 4.9 when booted via grub instead of 8.
> 
> It's may be related to :
> - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=820807 
> - https://xenproject.atlassian.net/browse/XEN-42 

While this suggests you've indeed tried to look around a little, ...

> It is the first server on which I have this problem.
> 
> I can confirm that :
> - if I boot Debian througt grub, I see the 8 cores
> - if I boot Xen through grub, I only see _one_ core
> - if I boot Xen directly through EFI (using `efibootmgr`), I see the 8 cores
> 
> 1. Do you know what happens ?

... your report is very likely duplicating earlier ones where the
ACPI root point cannot be found without it being properly
propagated through by grub from EFI to Xen. Iirc the only
way around that is to chainload xen.efi, if the grub used
doesn't support the extensions needed to boot Xen via the
multiboot2 protocol (support for which was added during the
4.9 development cycle).

Jan


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