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=-5.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 5469EC3A59E for ; Wed, 21 Aug 2019 17:35:09 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 15AD52332A for ; Wed, 21 Aug 2019 17:35:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="FDrCB6hT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 15AD52332A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A66326B032C; Wed, 21 Aug 2019 13:35:08 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A17346B032D; Wed, 21 Aug 2019 13:35:08 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9546E6B032E; Wed, 21 Aug 2019 13:35:08 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0082.hostedemail.com [216.40.44.82]) by kanga.kvack.org (Postfix) with ESMTP id 7543E6B032C for ; Wed, 21 Aug 2019 13:35:08 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 32CF252D6 for ; Wed, 21 Aug 2019 17:35:08 +0000 (UTC) X-FDA: 75847135896.05.doll56_8417a5e0d2e25 X-HE-Tag: doll56_8417a5e0d2e25 X-Filterd-Recvd-Size: 2922 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Aug 2019 17:35:07 +0000 (UTC) Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 809FC22D6D; Wed, 21 Aug 2019 17:35:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566408906; bh=oft2b/XAnOccaMbScogNYg5GBmBHqqVhsI2dgxn3frk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=FDrCB6hTk4MgsFW5L7cH0WWv1uq0GK+uo0eFZhYt9jal412Ps88auo95YKLoSijfw HgXtwtGGfReUWAThdTALJejBZ+lacbpBcnlBxqFlBEMEGabf9izZNNuhKMhIsGOvzd P1qQJpo7fn1vTibgT7BoACw5MlbTwJ5/UqLgXc4M= Date: Wed, 21 Aug 2019 18:35:01 +0100 From: Will Deacon To: Catalin Marinas Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, Andrew Morton , Vincenzo Frascino , Andrey Konovalov , Szabolcs Nagy , Kevin Brodsky , Dave P Martin , Dave Hansen , linux-doc@vger.kernel.org, linux-arch@vger.kernel.org, Will Deacon Subject: Re: [PATCH v9 2/3] arm64: Define Documentation/arm64/tagged-address-abi.rst Message-ID: <20190821173501.brvyn5mm5oh6m2s7@willie-the-truck> References: <20190821164730.47450-1-catalin.marinas@arm.com> <20190821164730.47450-3-catalin.marinas@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190821164730.47450-3-catalin.marinas@arm.com> User-Agent: NeoMutt/20170113 (1.7.2) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000184, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Aug 21, 2019 at 05:47:29PM +0100, Catalin Marinas wrote: > From: Vincenzo Frascino > > On AArch64 the TCR_EL1.TBI0 bit is set by default, allowing userspace > (EL0) to perform memory accesses through 64-bit pointers with a non-zero > top byte. Introduce the document describing the relaxation of the > syscall ABI that allows userspace to pass certain tagged pointers to > kernel syscalls. > > Cc: Will Deacon > Cc: Andrey Konovalov > Cc: Szabolcs Nagy > Cc: Kevin Brodsky > Signed-off-by: Vincenzo Frascino > Co-developed-by: Catalin Marinas > Signed-off-by: Catalin Marinas > --- > Documentation/arm64/tagged-address-abi.rst | 156 +++++++++++++++++++++ > 1 file changed, 156 insertions(+) > create mode 100644 Documentation/arm64/tagged-address-abi.rst Thanks, I'll pick this on up. Will