From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 62C67612E3 for ; Fri, 23 Feb 2024 10:31:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708684277; cv=none; b=aJuRX6Iot4WUeji+TQ9iJ7dTDHikI9VDwWRt1c1vSDxfNtWIzBjltJ7g/nibkwEy5sPLt7wSGO/1F1GGuswPwQjOvmCWgNki2xcvMVmRIPSZTLmh+vpth+zGXunkR363CLX0QMWsfI5nJP3fviYgmpARuDqW183cExOS+5h4Rgc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708684277; c=relaxed/simple; bh=jkLLuHQoX7Qx5Fy5qJpixZOVOxqV9iRWh6D0pLconUY=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=Q1jn588/RoTO6tHjjnEcbf5AUGfMXkpBHE39GoQzuLT3JRSlcMEGQgsRJzbNp24I6owyHF7jJ5sy7DgZeB5iGUhFSDJQ2fAyqJFUg0JYsPXjY46x8Jmi/UKah4HgrTZM0ibgDCsnJMfkH0/fQcMdV3NjmFZhVsoPHU37y4mHNm4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=YiVSVT26; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=09ZIG2ZH; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="YiVSVT26"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="09ZIG2ZH" From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1708684273; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=jkLLuHQoX7Qx5Fy5qJpixZOVOxqV9iRWh6D0pLconUY=; b=YiVSVT263F5FBqEISJkPVpVsZcbfVYxujjjgmA68+1aW2JPWI88DfN/lemthMtK9Xk+BYk MgST4jZJNVsyNLdN4eVZOV+0A5SRkDYOTuZBmumyXO8//S4D7zAoBbMHxmutSMB6IyzpKP 6cVUOYz1ScR4VuG/JeY+rJdfXl2Qx31iV/xfxnEoxFVON5ouD7AcLPZQ8RKmL+tcbOMWwk sLbKA9+9jJ5h22X1l0RdrMHbw8GbGhf3bivax/n/FQMPz/PCwW6apOB3mN6s/QXtukML1X yEIrYNmzz4LTBTjEwg+YsGUCkssgiC9EjzW1yV3N8Q6Wd5gEgzTwXYlVsO1PxA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1708684273; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=jkLLuHQoX7Qx5Fy5qJpixZOVOxqV9iRWh6D0pLconUY=; b=09ZIG2ZHx8YiIlTpa2V0EoiX45d9E+RxpvYkjsbD254Oww6TUCvu2V8tVDb1bx9jIP0dka Sl0WEcqgpr8YkrCg== To: "Kirill A. Shutemov" , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org Cc: "Rafael J. Wysocki" , Peter Zijlstra , Adrian Hunter , Kuppuswamy Sathyanarayanan , Elena Reshetova , Jun Nakajima , Rick Edgecombe , Tom Lendacky , "Kalra, Ashish" , Sean Christopherson , "Huang, Kai" , Baoquan He , kexec@lists.infradead.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: Re: [PATCHv7 16/16] x86/acpi: Add support for CPU offlining for ACPI MADT wakeup method In-Reply-To: <20240212104448.2589568-17-kirill.shutemov@linux.intel.com> References: <20240212104448.2589568-1-kirill.shutemov@linux.intel.com> <20240212104448.2589568-17-kirill.shutemov@linux.intel.com> Date: Fri, 23 Feb 2024 11:31:12 +0100 Message-ID: <87jzmvcw0f.ffs@tglx> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Mon, Feb 12 2024 at 12:44, Kirill A. Shutemov wrote: > MADT Multiprocessor Wakeup structure version 1 brings support of CPU > offlining: BIOS provides a reset vector where the CPU has to jump to > for offlining itself. The new TEST mailbox command can be used to test > whether the CPU offlined itself which means the BIOS has control over > the CPU and can online it again via the ACPI MADT wakeup method. > > Add CPU offling support for the ACPI MADT wakeup method by implementing > custom cpu_die(), play_dead() and stop_this_cpu() SMP operations. > > CPU offlining makes is possible to hand over secondary CPUs over kexec, > not limiting the second kernel to a single CPU. > > The change conforms to the approved ACPI spec change proposal. See the > Link. > > Signed-off-by: Kirill A. Shutemov > Link: https://lore.kernel.org/all/13356251.uLZWGnKmhe@kreacher > Acked-by: Kai Huang > Reviewed-by: Kuppuswamy Sathyanarayanan Reviewed-by: Thomas Gleixner