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 7DB1FC433E0 for ; Tue, 7 Jul 2020 04:46:32 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 27CAB20722 for ; Tue, 7 Jul 2020 04:46:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 27CAB20722 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 764936B0002; Tue, 7 Jul 2020 00:46:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7153B6B0005; Tue, 7 Jul 2020 00:46:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 604A76B0010; Tue, 7 Jul 2020 00:46:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0080.hostedemail.com [216.40.44.80]) by kanga.kvack.org (Postfix) with ESMTP id 4A6336B0002 for ; Tue, 7 Jul 2020 00:46:31 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id D6E781EE6 for ; Tue, 7 Jul 2020 04:46:30 +0000 (UTC) X-FDA: 77010043740.02.root55_560f09426eb1 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin02.hostedemail.com (Postfix) with ESMTP id AA7B11000A0B9466 for ; Tue, 7 Jul 2020 04:46:30 +0000 (UTC) X-HE-Tag: root55_560f09426eb1 X-Filterd-Recvd-Size: 3144 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by imf20.hostedemail.com (Postfix) with ESMTP for ; Tue, 7 Jul 2020 04:46:28 +0000 (UTC) IronPort-SDR: klHAZMlOTmiPnSxtAGmjCP3pgQad5VdaVPCuP33UQoTPe8Z+pnOOLw5KW1jqKTjZl9AGbmtMYA LRIFAFsmteOA== X-IronPort-AV: E=McAfee;i="6000,8403,9674"; a="146613347" X-IronPort-AV: E=Sophos;i="5.75,321,1589266800"; d="scan'208";a="146613347" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jul 2020 21:46:27 -0700 IronPort-SDR: w1b9Him4wF924ynVOVfX3FzeCVWWZZd2W8yiIgjwYBmic5wh/uZEBbDVcQfs9t3XfDpcfurZCp U0yapIVw6r2w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,321,1589266800"; d="scan'208";a="456970927" Received: from sjchrist-coffee.jf.intel.com (HELO linux.intel.com) ([10.54.74.152]) by orsmga005.jf.intel.com with ESMTP; 06 Jul 2020 21:46:26 -0700 Date: Mon, 6 Jul 2020 21:46:26 -0700 From: Sean Christopherson To: Matthew Wilcox Cc: Jarkko Sakkinen , x86@kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Jethro Beekman , Haitao Huang , Chunyang Hui , Jordan Hand , Nathaniel McCallum , Seth Moore , Suresh Siddha , andriy.shevchenko@linux.intel.com, asapek@google.com, bp@alien8.de, cedric.xing@intel.com, chenalexchen@google.com, conradparker@google.com, cyhanish@google.com, dave.hansen@intel.com, haitao.huang@intel.com, josh@joshtriplett.org, kai.huang@intel.com, kai.svahn@intel.com, kmoy@google.com, ludloff@google.com, luto@kernel.org, nhorman@redhat.com, puiterwijk@redhat.com, rientjes@google.com, tglx@linutronix.de, yaozhangx@google.com Subject: Re: [PATCH v34 11/24] x86/sgx: Add SGX enclave driver Message-ID: <20200707044626.GE5208@linux.intel.com> References: <20200707030204.126021-1-jarkko.sakkinen@linux.intel.com> <20200707030204.126021-12-jarkko.sakkinen@linux.intel.com> <20200707033617.GF25523@casper.infradead.org> <20200707041151.GE143804@linux.intel.com> <20200707042904.GD5208@linux.intel.com> <20200707043904.GJ25523@casper.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200707043904.GJ25523@casper.infradead.org> User-Agent: Mutt/1.5.24 (2015-08-30) X-Rspamd-Queue-Id: AA7B11000A0B9466 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 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 Tue, Jul 07, 2020 at 05:39:04AM +0100, Matthew Wilcox wrote: > although I think you have a simpler task. > > XA_STATE(xas, ..., start_index); > > for (;;) { > struct page *page = xas_next(&xas); > > if (!page || (~page->vm_max_prot_bits & vm_prot_bits)) > return -EACCES; > } > > return 0; > > should do the trick, I think. Ah, neato. Thanks!