Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.35 as permitted sender) client-ip=23.128.96.35;
From:   Thomas Gleixner <tglx@linutronix.de>
To:     "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org
Cc:     "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,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCHv2 02/13] kernel/cpu: Add support for declaring CPU
 offlining not supported
In-Reply-To: <20231020151242.1814-3-kirill.shutemov@linux.intel.com>
References: <20231020151242.1814-1-kirill.shutemov@linux.intel.com>
 <20231020151242.1814-3-kirill.shutemov@linux.intel.com>
Date:   Sat, 28 Oct 2023 16:12:10 +0200
Message-ID: <87a5s225vp.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

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!