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 X-Spam-Level: X-Spam-Status: No, score=-8.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1EC60C433FF for ; Thu, 1 Aug 2019 12:48:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E904621726 for ; Thu, 1 Aug 2019 12:48:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="mjC+j0aa" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731531AbfHAMsu (ORCPT ); Thu, 1 Aug 2019 08:48:50 -0400 Received: from mail-pg1-f194.google.com ([209.85.215.194]:35202 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731487AbfHAMsu (ORCPT ); Thu, 1 Aug 2019 08:48:50 -0400 Received: by mail-pg1-f194.google.com with SMTP id s1so27852431pgr.2 for ; Thu, 01 Aug 2019 05:48:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ATAFhJly7oayn4QwVxAmF/cKx18eZXYIEq5cLXvpdzg=; b=mjC+j0aaEEkkMHnLNHs9TEJqIdScFWRlkAZG8TbiBl3AyUZ8l5nLaU29ZLHSb7WvwH X3OlQDdgsBZjncfM3ONy8Dqcuih1q2WnbLztoEOKMtf5vefqmMIHHwchJuo+ue+DCVka b9rui+0AvY5PeeX+qJY2jvBZQab/NzRkSsMupCgkTdlEDxE6K7Nu5zDKiMeGfnD3hicf 2VPYUTHD9bJKAQWesHnbiPWY9rwW/eF7WIHmcnvL9DkrJEokfA1mnjx39I+4RQdt1WLM ieuyPRr8iw6XMHiEGmpinxm+wGAydMTsA6N4zI0Tg/WWtENcJ84NKdjINucR3C9EQWXN EQGw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ATAFhJly7oayn4QwVxAmF/cKx18eZXYIEq5cLXvpdzg=; b=EAHTKD1g4oTp1NbdW/P1MzNaHjXsL3R1hJ/bCzEw89Vbnce93DzgXf+QytfmLMiJpm lSZOojHu8lXDj4heoaznPMgj/bDhdEGM9c+SGSLI1OzFuUOIrHPqg1KpGCLnBCFjNYKG v/oPb9/1pkFUxNejjjF/RarIbHUdHakLVspCrsQlU/+YZfZZuuxxFe59jekaPvC6PnRp oRozmsXLBvenj5oNyz2mTE95rSAWL24vxQcf9s2pIQ7FJGeabAR+3kxV+qpukJFfYUsI t/HZ7jq/5pbldrEMAHIjkL8T7VWMFRY5AXMbN2FWA6MX4lr/1e3tchTSrD/qxKkKBxyI K9+w== X-Gm-Message-State: APjAAAVnH/UbK6n5p/dkOUA2G+IAZvFT34RB0ZL4pNI9INdwFxkE3rYB WiQ7t/2U8xTVTYE2ZzRe05mnAwH4VOlx7eQoTOzO/A== X-Google-Smtp-Source: APXvYqyuYmWo+CP2FzNWYkHFT0ZLT3W5Y5OJQeMQdVh76HiNmdD4jPQ2fznL3kD7gDek9Cqsx8/zBcK9HOnHQgVpStE= X-Received: by 2002:a65:4b8b:: with SMTP id t11mr118476394pgq.130.1564663728917; Thu, 01 Aug 2019 05:48:48 -0700 (PDT) MIME-Version: 1.0 References: <8c618cc9-ae68-9769-c5bb-67f1295abc4e@intel.com> <13b4cf53-3ecb-f7e7-b504-d77af15d77aa@arm.com> In-Reply-To: <13b4cf53-3ecb-f7e7-b504-d77af15d77aa@arm.com> From: Andrey Konovalov Date: Thu, 1 Aug 2019 14:48:37 +0200 Message-ID: Subject: Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel To: Kevin Brodsky Cc: Dave Hansen , Linux ARM , Linux Memory Management List , LKML , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, "open list:KERNEL SELFTEST FRAMEWORK" , Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Szabolcs Nagy Content-Type: text/plain; charset="UTF-8" Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org On Thu, Aug 1, 2019 at 2:11 PM Kevin Brodsky wrote: > > On 31/07/2019 17:50, Dave Hansen wrote: > > On 7/23/19 10:58 AM, Andrey Konovalov wrote: > >> The mmap and mremap (only new_addr) syscalls do not currently accept > >> tagged addresses. Architectures may interpret the tag as a background > >> colour for the corresponding vma. > > What the heck is a "background colour"? :) > > Good point, this is some jargon that we started using for MTE, the idea being that > the kernel could set a tag value (specified during mmap()) as "background colour" for > anonymous pages allocated in that range. > > Anyway, this patch series is not about MTE. Andrey, for v20 (if any), I think it's > best to drop this last sentence to avoid any confusion. Sure, thanks! > > Kevin