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[209.85.220.65]) by mx.google.com with SMTPS id k6sor48609179pgs.79.2019.08.01.05.48.49 for (Google Transport Security); Thu, 01 Aug 2019 05:48:49 -0700 (PDT) Received-SPF: pass (google.com: domain of andreyknvl@google.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=mjC+j0aa; spf=pass (google.com: domain of andreyknvl@google.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=andreyknvl@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com 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-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" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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