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 C8B69C433DF for ; Tue, 7 Jul 2020 04:46:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A8E0020722 for ; Tue, 7 Jul 2020 04:46:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726961AbgGGEq2 (ORCPT ); Tue, 7 Jul 2020 00:46:28 -0400 Received: from mga18.intel.com ([134.134.136.126]:25277 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726805AbgGGEq1 (ORCPT ); Tue, 7 Jul 2020 00:46:27 -0400 IronPort-SDR: S92ZUWu7XgTteUrdwK5CKYaOhuadAtgJnah22YuhyvTcZSSjSSlEi2HVJI9jVqJy6Y5A7i3UbR ZXInuMfroRoQ== X-IronPort-AV: E=McAfee;i="6000,8403,9674"; a="135003756" X-IronPort-AV: E=Sophos;i="5.75,321,1589266800"; d="scan'208";a="135003756" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jul 2020 21:46:26 -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) Sender: linux-sgx-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org 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!