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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 0ED94C43603 for ; Mon, 9 Dec 2019 08:41:32 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7A2112073D for ; Mon, 9 Dec 2019 08:41:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7A2112073D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 47Wc9g6mZTzDqQD for ; Mon, 9 Dec 2019 19:41:27 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=permerror (SPF Permanent Error: Unknown mechanism found: ip:192.40.192.88/32) smtp.mailfrom=kernel.crashing.org (client-ip=63.228.1.57; helo=gate.crashing.org; envelope-from=segher@kernel.crashing.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 47Wc6R2N40zDqNZ for ; Mon, 9 Dec 2019 19:38:38 +1100 (AEDT) Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id xB98c8a0027516; Mon, 9 Dec 2019 02:38:08 -0600 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id xB98c6QK027514; Mon, 9 Dec 2019 02:38:06 -0600 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Mon, 9 Dec 2019 02:38:06 -0600 From: Segher Boessenkool To: Christophe Leroy Subject: Re: [PATCH V2 00/13] powerpc/vas: Page fault handling for user space NX requests Message-ID: <20191209083806.GA3152@gate.crashing.org> References: <1575861522.16318.9.camel@hbabu-laptop> <8ba807dd-9d5a-e42a-60e8-f9ad648026bf@c-s.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8ba807dd-9d5a-e42a-60e8-f9ad648026bf@c-s.fr> User-Agent: Mutt/1.4.2.3i X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, mikey@neuling.org, herbert@gondor.apana.org.au, Haren Myneni , npiggin@gmail.com, hch@infradead.org, sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Hi! On Mon, Dec 09, 2019 at 06:37:09AM +0100, Christophe Leroy wrote: > What do you mean by NX ? It is the Power9 "Nest Accelerator". The patch series should ideally mention that right at the start, yeah. > Up to now, NX has been standing for No-eXecute. That's a bit in segment > registers on book3s/32 to forbid executing code. That bit is called just N fwiw (and not really specific to 32-bit -- on 64-bit implementations it was part of segment table entries, and of SLB entries on newer machines). Segher