linux-kernel - Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get

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Message-ID: <CAJZ5v0iqWv+XKpPL=kteV6_+=B_1j32QgPhab81i5=xsZ_YXnA@mail.gmail.com>
Date: Mon, 15 Apr 2024 14:41:17 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Salil Mehta <salil.mehta@...wei.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Jonathan Cameron <jonathan.cameron@...wei.com>, 
	Thomas Gleixner <tglx@...utronix.de>, "Russell King (Oracle)" <linux@...linux.org.uk>, 
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, 
	"loongarch@...ts.linux.dev" <loongarch@...ts.linux.dev>, 
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, 
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, 
	"kvmarm@...ts.linux.dev" <kvmarm@...ts.linux.dev>, "x86@...nel.org" <x86@...nel.org>, 
	Miguel Luis <miguel.luis@...cle.com>, James Morse <james.morse@....com>, 
	Jean-Philippe Brucker <jean-philippe@...aro.org>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, Linuxarm <linuxarm@...wei.com>, 
	"justin.he@....com" <justin.he@....com>, "jianyong.wu@....com" <jianyong.wu@....com>
Subject: Re: [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info()

On Mon, Apr 15, 2024 at 2:37 PM Salil Mehta <salil.mehta@...wei.com> wrote:
>
> Hi Rafael,
>
> >  From: Rafael J. Wysocki <rafael@...nel.org>
> >  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@huawei.com/
> 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.