Date:   Tue, 21 Feb 2023 11:49:26 +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,
        "Limonciello, Mario" <Mario.Limonciello@amd.com>,
        Piotr Gorski <piotrgorski@cachyos.org>
Subject: Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64
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References: <20230215145425.420125-1-usama.arif@bytedance.com> <2668869.mvXUDI8C0e@natalenko.name> <2a67f6cf18dd2c1879fad9fd8a28242918d3e5d2.camel@infradead.org> <982e1d6140705414e8fd60b990bd259a@natalenko.name> <715CBABF-4017-4784-8F30-5386F1524830@infradead.org> <67dbc69f-b712-8971-f1c9-5d07f506a19c@amd.com> <42dc683e2846ae8fc1e09715aaf7884660e1a386.camel@infradead.org> <37c18c3aeea2e558633b6da6886111d0@natalenko.name> <5A3B7074-0C6D-472B-803B-D76541828C1F@infradead.org> <3d8ed6e157df10c5175c636de0e21849@natalenko.name> <5c557f9b6f55dc2a612ee89142971298e6ae12d8.camel@infradead.org> <ee0d0d971a3095d6a1e96ad4f1ba32d2@natalenko.name> <5b8f9c89f7015fa80c966c6c7f6fa259db6744f8.camel@infradead.org> <ce731b5a4a53680b4840467977b33d9a@natalenko.name> <85ceb3f92abf3c013924de2f025517372bed19c0.camel@infradead.org> <3e5944de08ef0d23584d19bad7bae66c@natalenko.name> <26E5DC9C-0F19-4E4F-9076-04506A197374@infradead.org> <f71275dc809cfb32df513023786c3faa@natalenko.name>
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On 21 February 2023 11:46:04 GMT, Oleksandr Natalenko <oleksandr@natalenko=
=2Ename> wrote:
>On 21=2E02=2E2023 11:27, David Woodhouse wrote:
>> On 21 February 2023 09:49:51 GMT, Oleksandr Natalenko <oleksandr@natale=
nko=2Ename> wrote:
>>> On 21=2E02=2E2023 10:06, David Woodhouse wrote:
>>>> Why does arch/x86/kernel/acpi/sleep=2Ec::x86_acpi_suspend_lowlevel() =
set
>>>>=20
>>>>     initial_gs =3D per_cpu_offset(smp_processor_id()) ?
>>>>=20
>>>> Would it not be CPU#0 that comes back up, and should it not get
>>>> per_cpu_offset(0) ?
>>>=20
>>> Wanna me try `initial_gs =3D per_cpu_offset(0);` too?
>>=20
>> Hm, yes please=2E There's another one to make zero on the next line up,=
 I think?
>
>So,
>
>```
>early_gdt_descr=2Eaddress =3D (unsigned long)get_cpu_gdt_rw(0);
>initial_gs =3D per_cpu_offset(0);
>```
>
>?
>
>Should I leave `smpboot_control =3D 0;` commented out, or I should uncomm=
ent it back?

Put it back, else those things don't matter=2E Thanks=2E