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[2620:137:e000::1:20]) by mx.google.com with ESMTP id b24-20020a056402139800b00410aa9e83a9si11290556edv.455.2022.03.15.08.59.49; Tue, 15 Mar 2022 09:00:25 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=W46ewqL7; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236102AbiCNDrp (ORCPT + 99 others); Sun, 13 Mar 2022 23:47:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47244 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234516AbiCNDrn (ORCPT ); Sun, 13 Mar 2022 23:47:43 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 038022019B; Sun, 13 Mar 2022 20:46:35 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id AEACFB80B01; Mon, 14 Mar 2022 03:46:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A7D71C340E9; Mon, 14 Mar 2022 03:46:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1647229592; bh=9CffuTNQUaMUmjqmJch5cZlo4q/gGksVZbh40A3Psuw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=W46ewqL7DOEXG23covLPSNlxGH08m7QBbMKyzgvbkX0+USSE0TIN78sXSvrf8x6jz PWsObOxMPMoP/Y3/qTByz/AS5RHtaW/gBlmUpMm4w19Tv+BSEYyzwH2NnVKmKygLYP GGGjNIE78syrJu7LI9aIL0o+in9CHfV+u3PBtsfaIRMe4xKP6f5J4gNvjExp1/7Z6Y UIvEUgIKICe3vLSvmTF4FlR8pkt3x9KqKgbjG5Mm+L8egoVbhvms5tP19IdW0WpztF GQ29lYU3nzaaUn5+0BivBTjztY1lYhucX1W3B3eZJ1zJjWTSs9aiA+nWYudaqg50ou gTkl421aOhMpg== Date: Mon, 14 Mar 2022 05:45:45 +0200 From: Jarkko Sakkinen To: Reinette Chatre Cc: Haitao Huang , "Dhanraj, Vijay" , "dave.hansen@linux.intel.com" , "tglx@linutronix.de" , "bp@alien8.de" , "Lutomirski, Andy" , "mingo@redhat.com" , "linux-sgx@vger.kernel.org" , "x86@kernel.org" , "Christopherson,, Sean" , "Huang, Kai" , "Zhang, Cathy" , "Xing, Cedric" , "Huang, Haitao" , "Shanahan, Mark" , "hpa@zytor.com" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH V2 16/32] x86/sgx: Support restricting of enclave page permissions Message-ID: References: <97565fed-dc67-bab1-28d4-c40201c9f055@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-8.6 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 14, 2022 at 05:42:43AM +0200, Jarkko Sakkinen wrote: > On Fri, Mar 11, 2022 at 11:28:27AM -0800, Reinette Chatre wrote: > > Supporting permission restriction in an ioctl() enables the runtime to manage > > the enclave memory without needing to map it. > > Which is opposite what you do in EAUG. You can also augment pages without > needing the map them. Sure you get that capability, but it is quite useless > in practice. Essentially you are tuning for a niche artifical use case over the common case that most people end up doing. It makes no sense. BR, Jarkko