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Re: [Xen-devel] Only 1 CPU was detected

On 28/09/17 09:22, Hongjiang Zhang wrote:
> See the attachment.
>> -----Original Message-----
>> From: Juergen Gross [mailto:jgross@xxxxxxxx]
>> Sent: Thursday, September 28, 2017 2:13 PM
>> To: Hongjiang Zhang <honzhan@xxxxxxxxxxxxx>; xen-
>> devel@xxxxxxxxxxxxxxxxxxxx
>> Subject: Re: [Xen-devel] Only 1 CPU was detected
>> On 28/09/17 07:12, Hongjiang Zhang wrote:
>>> Hi all,
>>> I install Xen 4.8 on Ubuntu 17.04 (kernel is updated to 4.12). But I
>>> found only 1 CPU was detected.
>>> I thought it is caused by some BIOS settings, so I enabled x2APIC in
>>> BIOS, unfortunately, Linux hangs during booting after printing
>>> "Loading initial ramdisk ...".
>>> I have to disable x2APIC finally, but I only have 1 CPU when system is
>>> up. Does anyone encounter this issue?
>> Please post the output of "xl dmesg". This will show the hypervisor messages.

> (XEN) ACPI Error (tbxfroot-0218): A valid RSDP was not found [20070126]

Uuh, that is rather bad, I guess.

Just to be sure: can you please add "loglvl=all" to the xen boot
parameters? This would need to be added in your grub config file just
where "no-real-mode edd=off" is specified today (parameters for xen.gz).
Then repost the "xl dmesg" output, please.

Setting up a serial console would help, too, as you could then capture
the output with enabled x2APIC, which might help to find the reason why
Linux boot is hanging with this option.

Additionally you should check whether you can update the BIOS of the
test machine to a more recent version. It seems to be broken.


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