Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()

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To: Salil Mehta <salil.mehta@xxxxxxxxxx>
Subject: Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
From: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Date: Mon, 15 Apr 2024 14:41:17 +0200
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "Russell King (Oracle)" <linux@xxxxxxxxxxxxxxx>, "linux-pm@xxxxxxxxxxxxxxx" <linux-pm@xxxxxxxxxxxxxxx>, "loongarch@xxxxxxxxxxxxxxx" <loongarch@xxxxxxxxxxxxxxx>, "linux-acpi@xxxxxxxxxxxxxxx" <linux-acpi@xxxxxxxxxxxxxxx>, "linux-arch@xxxxxxxxxxxxxxx" <linux-arch@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "kvmarm@xxxxxxxxxxxxxxx" <kvmarm@xxxxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, Miguel Luis <miguel.luis@xxxxxxxxxx>, James Morse <james.morse@xxxxxxx>, Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Linuxarm <linuxarm@xxxxxxxxxx>, "justin.he@xxxxxxx" <justin.he@xxxxxxx>, "jianyong.wu@xxxxxxx" <jianyong.wu@xxxxxxx>
In-reply-to: <8d4ce570374b47819aef51cabab766d8@huawei.com>
References: <20240412143719.11398-1-Jonathan.Cameron@huawei.com> <20240412143719.11398-4-Jonathan.Cameron@huawei.com> <CAJZ5v0gNvy2e=hOGQQ2kLpnrDr8=QGBax-E5odEJ=7BA8qW-9A@mail.gmail.com> <ZhmWkE+fCEG/WFoi@shell.armlinux.org.uk> <87bk6ez4hj.ffs@tglx> <ZhmtO6zBExkQGZLk@shell.armlinux.org.uk> <878r1iyxkr.ffs@tglx> <20240415094552.000008d7@Huawei.com> <CAJZ5v0ireu4pOedLjMjK2NrLkq_2vySpdgEgGccQEiFC5=otWQ@mail.gmail.com> <20240415125649.00001354@huawei.com> <CAJZ5v0iNSmV6EsBOc5oYWSTR9UvFOeg8_mj8Ofhum4Tonb3kNQ@mail.gmail.com> <8d4ce570374b47819aef51cabab766d8@huawei.com>

On Mon, Apr 15, 2024 at 2:37 PM Salil Mehta <salil.mehta@xxxxxxxxxx> wrote:
>
> Hi Rafael,
>
> >  From: Rafael J. Wysocki <rafael@xxxxxxxxxx>
> >  Sent: Monday, April 15, 2024 1:04 PM
> >

[cut]

> >
> >  I need to do some investigation which will take some time I suppose.
>
>
> You might find below cover letter and links to the presentations useful:
>
> 1. https://lore.kernel.org/qemu-devel/20230926100436.28284-1-salil.mehta@xxxxxxxxxx/
> 2. https://kvm-forum.qemu.org/2023/KVM-forum-cpu-hotplug_7OJ1YyJ.pdf
> 3. https://kvm-forum.qemu.org/2023/Challenges_Revisited_in_Supporting_Virt_CPU_Hotplug_-__ii0iNb3.pdf
> 4. https://sched.co/eE4m

Thanks, I'll go through this, but I kind of doubt if it helps me with
finding out what to do with the hotadd_init flag.

References:
- [PATCH v5 00/18] ACPI/arm64: add support for virtual cpu hotplug
  - From: Jonathan Cameron
- [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Jonathan Cameron
- Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Rafael J. Wysocki
- Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Russell King (Oracle)
- Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Thomas Gleixner
- Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Russell King (Oracle)
- Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Thomas Gleixner
- Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Jonathan Cameron
- Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Rafael J. Wysocki
- Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Jonathan Cameron
- Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Rafael J. Wysocki
- RE: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()
  - From: Salil Mehta

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