linux-kernel - Re: [PATCHv2 02/13] kernel/cpu: Add support for declaring CPU offlining not supported

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Message-ID: <20231029142337.54cvg7cuwlmr3bzc@box>
Date:   Sun, 29 Oct 2023 17:23:37 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Kalra, Ashish" <ashish.kalra@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        "Huang, Kai" <kai.huang@...el.com>, Baoquan He <bhe@...hat.com>,
        kexec@...ts.infradead.org, linux-coco@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 02/13] kernel/cpu: Add support for declaring CPU
 offlining not supported

On Sat, Oct 28, 2023 at 04:12:10PM +0200, Thomas Gleixner wrote:
> On Fri, Oct 20 2023 at 18:12, Kirill A. Shutemov wrote:
> 
> Subject: cpu/hotplug: ...
> 
> > ACPI MADT doesn't allow to offline CPU after it got woke up.
> 
> ACPI MADT is a table ...
> 
> This is about the MADT mailbox wakeup method, right?
> 
> > Currently offlining hotplug prevented based on the confidential
> 
> is prevented
> 
> > computing attribute which is set for Intel TDX. But TDX is not
> > the only possible user of the wake up method.
> >
> > Introduce cpu_hotplug_not_supported() that can be called to indicate
> > that CPU offlining should be disabled.
> 
> Otherwise the changes look good!

Thanks!

Thomas, could you take a look if the last patch in the series is sane?

-- 
  Kiryl Shutsemau / Kirill A. Shutemov