Date:   Tue, 21 Feb 2023 07:53:49 +0000
From:   David Woodhouse <dwmw2@infradead.org>
To:     Oleksandr Natalenko <oleksandr@natalenko.name>
CC:     Kim Phillips <kim.phillips@amd.com>, tglx@linutronix.de,
        Usama Arif <usama.arif@bytedance.com>, arjan@linux.intel.com,
        mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
        hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com,
        paulmck@kernel.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de,
        hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com,
        pmenzel@molgen.mpg.de, fam.zheng@bytedance.com,
        punit.agrawal@bytedance.com, simon.evans@bytedance.com,
        liangma@liangbit.com, Piotr Gorski <lucjan.lucjanov@gmail.com>,
        "Limonciello, Mario" <Mario.Limonciello@amd.com>
Subject: Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64
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On 21 February 2023 07:27:13 GMT, Oleksandr Natalenko <oleksandr@natalenko=
=2Ename> wrote:
>On 21=2E02=2E2023 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=2E=2E=2E
>>=20
>>=20
>> $ sudo cpuid | grep -A1 1/ebx
>>    miscellaneous (1/ebx):
>>       process local APIC physical ID =3D 0x0 (0)
>> --
>>    miscellaneous (1/ebx):
>>       process local APIC physical ID =3D 0x2 (2)
>> =2E=2E=2E
>
>For me this command doesn't produce any output=2E Also, no output from th=
e command Kim used in response to you=2E With no `grep` it just dumps a tab=
le of raw hex data=2E

I'll take the hex please=2E

>It's `msr-tools` 1=2E3-4 from Arch=2E Should I run this command on a patc=
hed kernel booted with `no_parallel_bringup`, or on unpatched kernel (if th=
at makes any difference)?

Either works as long as it's after a resume that wouldn't have worked=2E T=
hanks=2E