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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 E0AECC43387 for ; Tue, 18 Dec 2018 13:27:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AAC24217D9 for ; Tue, 18 Dec 2018 13:27:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726598AbeLRN1Y (ORCPT ); Tue, 18 Dec 2018 08:27:24 -0500 Received: from mga05.intel.com ([192.55.52.43]:45870 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726559AbeLRN1X (ORCPT ); Tue, 18 Dec 2018 08:27:23 -0500 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 Dec 2018 05:27:23 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,368,1539673200"; d="scan'208";a="303149375" Received: from quwen-mobl.ccr.corp.intel.com (HELO localhost) ([10.249.254.215]) by fmsmga006.fm.intel.com with ESMTP; 18 Dec 2018 05:27:13 -0800 Date: Tue, 18 Dec 2018 15:27:11 +0200 From: Jarkko Sakkinen To: Andy Lutomirski Cc: Sean Christopherson , Dave Hansen , X86 ML , Platform Driver , linux-sgx@vger.kernel.org, nhorman@redhat.com, npmccallum@redhat.com, "Ayoun, Serge" , shay.katz-zamir@intel.com, Haitao Huang , Andy Shevchenko , Thomas Gleixner , "Svahn, Kai" , mark.shanahan@intel.com, Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Darren Hart , Andy Shevchenko , "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" Subject: Re: [PATCH v17 18/23] platform/x86: Intel SGX driver Message-ID: <20181218132711.GD25667@linux.intel.com> References: <7d5cde02-4649-546b-0f03-2d6414bb80b5@intel.com> <20181217180102.GA12560@linux.intel.com> <20181217183613.GD12491@linux.intel.com> <20181217184333.GA26920@linux.intel.com> <20181217222047.GG12491@linux.intel.com> <20181218013918.GC333@linux.intel.com> <20181218032702.GA2903@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 17, 2018 at 09:02:03PM -0800, Andy Lutomirski wrote: > That's what unmap_mapping_range(), etc do for you, no? IOW make a > struct address_space that represents the logical enclave address > space, i.e. address 0 is the start and the pages count up from there. > You can unmap pages whenever you want, and the core mm code will take > care of zapping the pages from all vmas referencing that > address_space. OK, so it does. Did not have time to look at it last night (about 3AM) :-) Yes, we could use that to do the N process zapping. Based on this discussion I can take the first steps with the swapping code. And yeah, I don't think we need anon inode for this one. Can just use the dev inode (did not check in detail but on the surface looks like it). /Jarkko