linux-kernel - Re: [RFC PATCH v3 00/39] ACPI/arm64: add support for virtual cpuhotplug

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Date:   Mon, 30 Oct 2023 17:51:03 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Miguel Luis <miguel.luis@...cle.com>
Cc:     "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>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "kvmarm@...ts.linux.dev" <kvmarm@...ts.linux.dev>,
        "x86@...nel.org" <x86@...nel.org>,
        "acpica-devel@...ts.linuxfoundation.org" 
        <acpica-devel@...ts.linuxfoundation.org>,
        "linux-csky@...r.kernel.org" <linux-csky@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        "jianyong.wu@....com" <jianyong.wu@....com>,
        "justin.he@....com" <justin.he@....com>,
        James Morse <james.morse@....com>
Subject: Re: [RFC PATCH v3 00/39] ACPI/arm64: add support for virtual
 cpuhotplug

On Mon, Oct 30, 2023 at 04:41:19PM +0000, Miguel Luis wrote:
> Hi Russell,
> 
> Tested on QEMU, based on Salil's RFC v2 [1], running with KVM.
> - boot
> - hotplug up to 'maxcpus'
> - hotunplug down to the number of boot cpus
> - hotplug vcpus and migrate with vcpus offline
> - hotplug vcpus and migrate with vcpus online
> - hotplug vcpus then unplug vcpus then migrate
> - successive live migrations (up until 6)
> 
> Feel free to add:
> Tested-by: Miguel Luis <miguel.luis@...cle.com>
> 
> Thank you
> Miguel
> 
> [1] https://lore.kernel.org/qemu-devel/20230926100436.28284-1-salil.mehta@huawei.com/

That's good news, thanks for testing!

I've pushed out an updated series against v6.6 earlier today in case
anyone wants something specifically against v6.6, but I don't think
there is any pressing reason to re-test. The only ACPI change
between the two is:

9b311b7313d6 ACPI: NFIT: Install Notify() handler before getting NFIT table

and the only arm64 changes are in dts files. Nothing significant in
kernel/ and nothing in drivers/base/.

So I think at this point, I will pause waiting for 6.7-rc1 (which
I'll do an updated patch set, since it will include changes queued
up) and hopefully followed by Rafael's comments. Maybe James will
also have some time to work on this again.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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