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_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 3D3D3C433DF for ; Thu, 25 Jun 2020 00:26:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B1CA20706 for ; Thu, 25 Jun 2020 00:26:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388337AbgFYA0B (ORCPT ); Wed, 24 Jun 2020 20:26:01 -0400 Received: from mga14.intel.com ([192.55.52.115]:49117 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388297AbgFYA0B (ORCPT ); Wed, 24 Jun 2020 20:26:01 -0400 IronPort-SDR: UZ7mmAI5Jrx9iUdjVdTlJxCAHDy5DnyR7qHDZKnowguKvdEmXXe4pGSky0qgJxihxkhBO0KMZ1 LrMIMVwXxG6A== X-IronPort-AV: E=McAfee;i="6000,8403,9662"; a="143777647" X-IronPort-AV: E=Sophos;i="5.75,277,1589266800"; d="scan'208";a="143777647" 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; 24 Jun 2020 17:26:01 -0700 IronPort-SDR: BEQtvTmD6wwDWELOfPA5PHyxRvdO2yX+JnHG2L+PoTdhD3UAwjB4QE21xnzOWg//zrDvmsW/tz tn+iLiz+XFTQ== X-IronPort-AV: E=Sophos;i="5.75,277,1589266800"; d="scan'208";a="452829364" Received: from suzann5x-mobl.amr.corp.intel.com (HELO [10.255.1.146]) ([10.255.1.146]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jun 2020 17:26:00 -0700 Subject: Re: [PATCH RFC] x86/sgx: Allocate form local NUMA node first To: Sean Christopherson Cc: Jarkko Sakkinen , linux-sgx@vger.kernel.org, kai.svahn@intel.com, bruce.schlobohm@intel.com References: <20200623043931.157156-1-jarkko.sakkinen@linux.intel.com> <57c83d3d-54ab-fc07-cefc-c3ebe478a8e9@intel.com> <20200624235406.GH25092@linux.intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200624235406.GH25092@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-sgx-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org On 6/24/20 4:54 PM, Sean Christopherson wrote: >> Does this actually work? >> >> The node span (->node_start_pfn through start+->node_spanned_pages) only >> contains pages which the OS is actively managing, usually RAM but >> sometimes also persistent memory. This has some assumption that the SGX >> PFNs are within the node's span. I would only _expect_ that to happen >> if the node was built like this: >> >> | Node-X RAM | EPC | Node-X RAM | >> >> If the EPC was on either end: >> >> | Node-X RAM | EPC | >> or >> | EPC | Node-X RAM | >> >> I suspect that the pgdat span wouldn't include EPC. EPC is, if I >> remember correctly, a E820_RESERVED region. > It is indeed E820_RESERVED, but the BIOS WG for ICX states that EPC regions > should be enumerated in ACPI SRAT along with regular memory. > > But, I haven't actually verified that info makes its way into the kernel's > pgdata stuff. Considering this, are we all agreed that this patch is in no condition to be submitted upstream?