Re: [Xen-users] Xen 4.1.2 HT disaware (?)

[Janno Loide <janno@xxxxxxx>]

That's a problem I've been stuck on twice ;-|.

With EFI, xen needs to be booted with xen.efi; any other boot loader 
detects ACPI tables before starting xen kernel and probably masks or 
blocks direct access to the raw data so the latter can't find the root 
pointer for tables anymore. Thus the message about not finding RSDP 
(Root System Description Pointer).
After that anything strange can (and probably will) happen: Xen detects 
wrong amount of RAM or cores, wrong capabilities on CPUs etc.
Probably, most of the Xen admins have already discovered that fact in 
the process already, yet I still think it wouldn't hurt to document that 
somewhere in Xen wiki:
 On an EFI enabled server Xen has to be booted via xen.efi loader.

Some OS installs do set the appropriate boot up automatically (SLES for 
example). Some, OSes, however, do not (Opensuse, for example) and you 
have to manage the boot entry for Xen manually.

Regards,
Janno


24.04.2013 13:14, Ian Campbell wrote:
> On Wed, 2013-04-24 at 11:02 +0100, Vadim A. Misbakh-Soloviov wrote:
> > 24.04.2013 16:29, Ian Campbell ÐÐÑÐÑ:
> > (XEN) ACPI Error (tbxfroot-0218): A valid RSDP was not found [20070126]
> Not having working ACPI is a bit of a problem and could well relate to
> the lack of HT.
>
> Updating to the latest BIOS for your system would seem like a good first
> step.
>
> Ian.

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