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

[Roman Shaposhnik <roman@xxxxxxxxxx>]

On Mon, Sep 30, 2019 at 3:19 AM Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>
> On 28/09/2019 04:07, 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.
> >>
> >>> So I guess at this point, you could say that I have a functional
> >>> system, but I'm curious whether you guys would be interested to look
> >>> into 2xAPIC situation.
> >> Of course we do. As a next step I'd suggest reverting the BIOS settings
> >> change you did, and instead using the "x2apic=0" Xen command line option.
> > Interestingly enough, this doesn't really solve the problem completely.
> > Specifying x2apic=0 certainly makes Xen go much further to a point
> > where it tries to load Dom0 and then the console VGA screen goes
> > blank (this is where that serial debug output would be very useful :-().
>
> Do you not even have IPMI SoL?  Its basically impossible to buy servers
> without this base level of functionality.
>
> It will be somewhere in the iLO configuration on an HP server.

This is a super awesome suggestion!

Attached are two logs. Please take a look -- both result in Xen hanging.

Thanks,
Roman.

Attachment: xen2.log
Description: Binary data

Attachment: xen1.log
Description: Binary data

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