From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A2B29C5479D for ; Mon, 9 Jan 2023 19:11:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237681AbjAITLi (ORCPT ); Mon, 9 Jan 2023 14:11:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50544 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237625AbjAITLX (ORCPT ); Mon, 9 Jan 2023 14:11:23 -0500 Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 260A263EB; Mon, 9 Jan 2023 11:11:00 -0800 (PST) Received: from zn.tnic (p5de8e9fe.dip0.t-ipconnect.de [93.232.233.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 2F0891EC03B3; Mon, 9 Jan 2023 20:10:59 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1673291459; 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: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=d1aT87qrkvs6HaPvfvslxRbyKpdc9CVfc63ZusxeMkE=; b=TnvR4QqKv79+Uq6ymbdzaI+Rq/etn5FbXa8ZAw3wFMp3b3bflgl210qbftasaj+GTud5rv aQZBVuaihWa6+U4l1ljo2SALrwOOcNsc5mcam4sc94qPv7ewL7l/YStPc0alBcLab9wwPN vQivx8wbkoT2wtcZS2XpxGicLxzUBAk= Date: Mon, 9 Jan 2023 20:10:54 +0100 From: Borislav Petkov To: "Michael Kelley (LINUX)" Cc: "hpa@zytor.com" , KY Srinivasan , Haiyang Zhang , "wei.liu@kernel.org" , Dexuan Cui , "luto@kernel.org" , "peterz@infradead.org" , "davem@davemloft.net" , "edumazet@google.com" , "kuba@kernel.org" , "pabeni@redhat.com" , "lpieralisi@kernel.org" , "robh@kernel.org" , "kw@linux.com" , "bhelgaas@google.com" , "arnd@arndb.de" , "hch@infradead.org" , "m.szyprowski@samsung.com" , "robin.murphy@arm.com" , "thomas.lendacky@amd.com" , "brijesh.singh@amd.com" , "tglx@linutronix.de" , "mingo@redhat.com" , "dave.hansen@linux.intel.com" , Tianyu Lan , "kirill.shutemov@linux.intel.com" , "sathyanarayanan.kuppuswamy@linux.intel.com" , "ak@linux.intel.com" , "isaku.yamahata@intel.com" , "Williams, Dan J" , "jane.chu@oracle.com" , "seanjc@google.com" , "tony.luck@intel.com" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , "linux-hyperv@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-pci@vger.kernel.org" , "linux-arch@vger.kernel.org" , "iommu@lists.linux.dev" Subject: Re: [Patch v4 04/13] x86/mm: Handle decryption/re-encryption of bss_decrypted consistently Message-ID: References: <1669951831-4180-1-git-send-email-mikelley@microsoft.com> <1669951831-4180-5-git-send-email-mikelley@microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Thu, Dec 29, 2022 at 04:25:16PM +0000, Michael Kelley (LINUX) wrote: > I'm ambivalent on the backport to stable. One might argue that older > kernel versions are conceptually wrong in using different conditions for > the decryption and re-encryption. But as you said, they aren't broken > from a practical standpoint because sme_me_mask and > CC_ATTR_MEM_ENCRYPT are equivalent prior to my patch set. However, > the email thread with Sathyanarayanan Kuppuswamy, Tom Lendacky, > and Dexuan Cui concluded that a Fixes: tag is appropriate. Right, just talked to Tom offlist. A Fixes tag triggers a lot of backporting activity and if it is not really needed, then let's leave it out. If distros decide to pick up vTOM support, then they'll pick up the whole set anyway. And if we decide we really need it backported for whatever reason, we will simply send it into stable and the same backporting activity will be triggered then. But then we'd at least have a concrete reason for it. Makes sense? Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette