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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS 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 E0D33C433E5 for ; Mon, 22 Mar 2021 22:24:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D6CD61606 for ; Mon, 22 Mar 2021 22:24:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230286AbhCVWXr (ORCPT ); Mon, 22 Mar 2021 18:23:47 -0400 Received: from mga03.intel.com ([134.134.136.65]:4942 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229962AbhCVWXM (ORCPT ); Mon, 22 Mar 2021 18:23:12 -0400 IronPort-SDR: KoGGHElcLEMSDWFiyLRHLHdoNkrczk9RJmhIO4d2S0RskR9HbDWl51nUAuKJ6cHkvE3WY2fzih li6MRsg6zOoA== X-IronPort-AV: E=McAfee;i="6000,8403,9931"; a="190385783" X-IronPort-AV: E=Sophos;i="5.81,269,1610438400"; d="scan'208";a="190385783" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Mar 2021 15:23:10 -0700 IronPort-SDR: 3jsiOqLOE4m5ve2B6I2lRNLY4iIVViTRm52ah8zfS5lW31FxyyIUtvOScKaGtuY7PfJmOm70lV Fw0cnDmRZu6Q== X-IronPort-AV: E=Sophos;i="5.81,269,1610438400"; d="scan'208";a="381133556" Received: from rmarinax-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.252.143.198]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Mar 2021 15:23:06 -0700 Date: Tue, 23 Mar 2021 11:23:03 +1300 From: Kai Huang To: Borislav Petkov Cc: Sean Christopherson , kvm@vger.kernel.org, x86@kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, rick.p.edgecombe@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com Subject: Re: [PATCH v3 03/25] x86/sgx: Wipe out EREMOVE from sgx_free_epc_page() Message-Id: <20210323112303.5eddd954ee601fca00b37aa3@intel.com> In-Reply-To: <20210322210645.GI6481@zn.tnic> References: <062acb801926b2ade2f9fe1672afb7113453a741.1616136308.git.kai.huang@intel.com> <20210322181646.GG6481@zn.tnic> <20210322191540.GH6481@zn.tnic> <20210322210645.GI6481@zn.tnic> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > Btw, I probably have seen this and forgotten again so pls remind me, > is the amount of pages available for SGX use static and limited by, > I believe BIOS, or can a leakage in EPC pages cause system memory > shortage? > Yes EPC size is fixed and configured in BIOS. Leaking EPC pages may cause EPC shortage, but not system memory.