Re: [Xen-devel] Latest development (master) Xen fails to boot on HP ProLiant DL20 GEN10

[Jan Beulich <jbeulich@xxxxxxxx>]

On 27.09.2019 04:28, Roman Shaposhnik wrote:
> On Thu, Sep 26, 2019 at 12:44 AM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>>
>> On 26.09.2019 00:31, Roman Shaposhnik wrote:
>>> Jan, Roger, thank you so much for the initial ideas. I tried a few of
>>> those and here's where I am.
>>>
>>> First of all, it is definitely related to CPU bring up. Adding
>>> cpuidle=0 to xen command line made Xen boot.
>>>
>>> Then, a good friend of mine (who you may know from ancient Xen days
>>> ;-)) suggested that this could be related to this:
>>>      https://wiki.xenproject.org/wiki/Xen_power_management
>>> so I went to the BIOS settings and quite to my surprise all of them
>>> were grayed out (not tweakable).
>>>
>>> The only one that wasn't was 2xAPIC support. So just for kicks -- I
>>> disabled that.
>>>
>>> That, in turn, made Xen boot even without cpuidle=0. I'm attaching that log.
>>
>> Interesting, but unfortunately this particular log is of no real use
>> for investigation of the issue (other than knowing the CPU model). I
>> also notice it's a 4.12.0 log, when your original report was against
>> latest master.
> 
> Understood. But this brings us back to: if I don't get Xen booting,
> I don't think I can capture the logs. This is a rackable server without
> anything like a serial port, etc.
> 
> I suppose the best I can do is to capture a video of Xen failing to boot?

As a last resort - yes. But that'll be awful to work with. Are you
saying you can't even put in a PCI card providing a serial port?
(I realize that asking about using a possible EHCI debug port would
be a little much, as the necessary cable isn't really inexpensive.)

Jan

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