linux-kernel - Re: [PATCH v9 0/8] Parallel CPU bringup for x86

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Message-ID: <3d8ed6e157df10c5175c636de0e21849@natalenko.name>
Date:   Tue, 21 Feb 2023 09:05:22 +0100
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     Kim Phillips <kim.phillips@....com>, tglx@...utronix.de,
        Usama Arif <usama.arif@...edance.com>, arjan@...ux.intel.com,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, x86@...nel.org, pbonzini@...hat.com,
        paulmck@...nel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, rcu@...r.kernel.org, mimoja@...oja.de,
        hewenliang4@...wei.com, thomas.lendacky@....com, seanjc@...gle.com,
        pmenzel@...gen.mpg.de, fam.zheng@...edance.com,
        punit.agrawal@...edance.com, simon.evans@...edance.com,
        liangma@...ngbit.com,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        Piotr Gorski <piotrgorski@...hyos.org>
Subject: Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64

On 21.02.2023 08:53, David Woodhouse wrote:
> On 21 February 2023 07:27:13 GMT, Oleksandr Natalenko 
> <oleksandr@...alenko.name> wrote:
>> On 21.02.2023 00:30, David Woodhouse wrote:
>>> Oleksandr, please could you show the output of 'cpuid' after a
>>> successful resume?  I'm particularly looking for this part...
>>> 
>>> 
>>> $ sudo cpuid | grep -A1 1/ebx
>>>    miscellaneous (1/ebx):
>>>       process local APIC physical ID = 0x0 (0)
>>> --
>>>    miscellaneous (1/ebx):
>>>       process local APIC physical ID = 0x2 (2)
>>> ...
>> 
>> For me this command doesn't produce any output. Also, no output from 
>> the command Kim used in response to you. With no `grep` it just dumps 
>> a table of raw hex data.
> 
> I'll take the hex please.

Please see here: http://ix.io/4oLm

>> It's `msr-tools` 1.3-4 from Arch. Should I run this command on a 
>> patched kernel booted with `no_parallel_bringup`, or on unpatched 
>> kernel (if that makes any difference)?
> 
> Either works as long as it's after a resume that wouldn't have worked. 
> Thanks.

OK, I'm on an unpatched kernel now.

-- 
   Oleksandr Natalenko (post-factum)