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Re: [Xen-devel] Latest development (master) Xen fails to boot on HP ProLiant DL20 GEN10
- To: Roman Shaposhnik <roman@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 1 Oct 2019 00:42:01 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Mon, 30 Sep 2019 23:42:23 +0000
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On 30/09/2019 23:01, Roman Shaposhnik wrote:
> 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.
That's good to hear. Hopefully we can make some progress.
To begin with, try dropping "dom0_vcpus_pin smt=false" from the command
line. Both may hit some corner cases.
Because of "(XEN) x2APIC mode is already enabled by BIOS.", the x2apic=0
part is useless and will be ignored. It can be dropped too.
Can you rebase to using Xen 4.12.1? It has a substantial number of
bugfixes over 4.12.0, and should strictly be used in preference.
Alternatively, staging-4.12 has a few fixes more than 4.12.1, notably
"x86/apic: enable x2APIC mode before doing any setup" which fixes an
issue with x2APIC initialisation.
If possible, can you use a debug build of Xen?
~Andrew
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