From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.alien8.de (mail.alien8.de [65.109.113.108]) (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 B06DD21C17D; Mon, 1 Dec 2025 19:10:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=65.109.113.108 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764616262; cv=none; b=NSeluxAeIiNYMMMavMZc5EtjgYak9u/nZe+QLxipiWHEzPNAIRUPAats8Px9Xy5LgUHiyeECWHudOv4Rc9XMB/FYW8giCKzso/T6qf+uLFMR9sxlxI2w6baItynG5SfT+v84wZ/ZMy5W/TB6VilLTIsfrG6bnuZYIiiFhCngZsY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764616262; c=relaxed/simple; bh=JLHuEcPs9WDKmUX71yKWwrgVB32IBQmDy5LFT8tzAkk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=o9S0AvCJ1Do9EW/Z10/QIb8B5qCTIRzV85qwH70ViJfj+4WzSnfFdvF+h/6vgdXOTPqNIiofHG/N7ovtDtcPSO9SoElJEu9fOtXpST1PPxxwe38rxc9kxWpTR5Sg06OEfXLnZFuYXjgzO6IJKWIlkti2CWyx0oQZW0WSUdqKXdE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de; spf=pass smtp.mailfrom=alien8.de; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b=hFHgP5aT; arc=none smtp.client-ip=65.109.113.108 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=alien8.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b="hFHgP5aT" Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id 4085540E0250; Mon, 1 Dec 2025 19:10:57 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Authentication-Results: mail.alien8.de (amavisd-new); dkim=pass (4096-bit key) header.d=alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id rJExDO_Sw0EC; Mon, 1 Dec 2025 19:10:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1764616253; bh=CDLSW0ULC7fV+/6nJr9bGCnAS0M4/BaP2qnQFeyHNgw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hFHgP5aTyr+63EucuqjMPTsgEkr476XAmWkB7ouwdOpeO6lD+EHfTGjKk1oju7Xax /nSihwUqydhbEZ2lilnJI90sx5ngOfaOMwYtUUsPdyPRnWcU0LCqHmZzAYPUjf48+p ISt/5Uw1MNnAZ5+79krRIN8jzhPSTHD96Pn3lHUm1BvlH1vusAA6Ao6T2fJbKN5c7m LnPp7beJ4qz9Ac/KY0R9BL9Up61PocDHWM/DBbEopy09bEb9I4Jo0Vy4hWpQU2moYk ZgqFx2/XJ5VSDbYzI8a8UbX6IglDw6bhvPe7Neaas78ulrI/3z2BjG/q3eXfR7mZl4 i7hoXwSmJ8BV6n0v52C43eqFB0wFn/zIl/ZkNTxjkUVZ7BfPFflD6XvWMfTVM6Tfpi 5pn1whpqQoa1KOaUSzkWPNyeh2t3ACZBsAcKfUXjk8FsWhDO+lfJ5SJtLUYkXRCZZ7 czxDndKDjPgDzpRUMnVtiU9dW5lTa45WY95WmvQinLUEIpK/Rh4qN3H3H75CpP+EXN T7Zr6VD7Xb6xpwFXWSuHo2Gxpxt7iPfgCxYS9eVKfzhUWw5SmSFhxcpZ/ojwUAQceG H8W0Hyc63Zs/fj/leMn5TSP3RW9xbSZa4US5ond2t7MKRAaQOiqrjlzU3evr3FqF7K 9lBL64wAn/0+3O6jcZFfvD/k= Received: from zn.tnic (pd953063a.dip0.t-ipconnect.de [217.83.6.58]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with UTF8SMTPSA id 7350840E01A5; Mon, 1 Dec 2025 19:10:37 +0000 (UTC) Date: Mon, 1 Dec 2025 20:10:36 +0100 From: Borislav Petkov To: "David Hildenbrand (Red Hat)" Cc: Kiryl Shutsemau , "Pratik R. Sampat" , linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, ardb@kernel.org, akpm@linux-foundation.org, osalvador@suse.de, thomas.lendacky@amd.com, michael.roth@amd.com Subject: Re: [RFC PATCH 2/4] mm: Add support for unaccepted memory hotplug Message-ID: <20251201191036.GEaS3oLBY8PEuE91Ap@fat_crate.local> References: <20251125175753.1428857-3-prsampat@amd.com> <66ylzwknm4ftd6utn3nqr63jmhl2ccvcdvyi5fechfnvmfxivu@37pckhjixayh> <20251126223127.GIaSd_v7juUkaW4RTA@fat_crate.local> <20251127181233.GBaSiUkaLzwANS_6WT@fat_crate.local> <20251128113411.GAaSmIs0kSWGhCYkaA@fat_crate.local> <47927c25-a317-488a-823f-ac0588f4eee4@kernel.org> <20251201111201.GAaS14AX18qeHN20xf@fat_crate.local> <052d7f47-edb6-4978-bc9a-c7eae469720f@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <052d7f47-edb6-4978-bc9a-c7eae469720f@kernel.org> On Mon, Dec 01, 2025 at 07:32:38PM +0100, David Hildenbrand (Red Hat) wrote: > I think we are in agreement: from what I recall, this software contract used to be > rather simple and stable. Ok, please point me to the *explicit* document in our tree which says: "we won't break the kernel and support kexec with any kernel version"? Something ala Documentation/process/stable-api-nonsense.rst Which says things like: "Assuming that we had a stable kernel source interface for the kernel, a binary interface would naturally happen too, right? Wrong." Which I read as a "no" to the kexec question too. IOW, it is not about whether it works or not - it is about enforcing that. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette