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Date:   Sun, 29 Oct 2023 17:23:37 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@linux.intel.com>,
        Elena Reshetova <elena.reshetova@intel.com>,
        Jun Nakajima <jun.nakajima@intel.com>,
        Rick Edgecombe <rick.p.edgecombe@intel.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        "Kalra, Ashish" <ashish.kalra@amd.com>,
        Sean Christopherson <seanjc@google.com>,
        "Huang, Kai" <kai.huang@intel.com>, Baoquan He <bhe@redhat.com>,
        kexec@lists.infradead.org, linux-coco@lists.linux.dev,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCHv2 02/13] kernel/cpu: Add support for declaring CPU
 offlining not supported
Message-ID: <20231029142337.54cvg7cuwlmr3bzc@box>
References: <20231020151242.1814-1-kirill.shutemov@linux.intel.com>
 <20231020151242.1814-3-kirill.shutemov@linux.intel.com>
 <87a5s225vp.ffs@tglx>
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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