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=-5.3 required=3.0 tests=BAYES_00, 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 1804BC433B4 for ; Wed, 14 Apr 2021 15:42:36 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id AEF9660FD8 for ; Wed, 14 Apr 2021 15:42:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AEF9660FD8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4B9776B0080; Wed, 14 Apr 2021 11:42:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 490546B0081; Wed, 14 Apr 2021 11:42:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 37F406B0082; Wed, 14 Apr 2021 11:42:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0149.hostedemail.com [216.40.44.149]) by kanga.kvack.org (Postfix) with ESMTP id 1D0F76B0080 for ; Wed, 14 Apr 2021 11:42:35 -0400 (EDT) Received: from smtpin36.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id D499282499B9 for ; Wed, 14 Apr 2021 15:42:34 +0000 (UTC) X-FDA: 78031389828.36.AF74445 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf17.hostedemail.com (Postfix) with ESMTP id 3557740002D7 for ; Wed, 14 Apr 2021 15:42:32 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 921EE68C7B; Wed, 14 Apr 2021 17:42:32 +0200 (CEST) Date: Wed, 14 Apr 2021 17:42:32 +0200 From: Christoph Hellwig To: Tianyu Lan Cc: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, akpm@linux-foundation.org, gregkh@linuxfoundation.org, konrad.wilk@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, Tianyu Lan , iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com Subject: Re: [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver in the isolation VM. Message-ID: <20210414154232.GC32045@lst.de> References: <20210414144945.3460554-1-ltykernel@gmail.com> <20210414144945.3460554-9-ltykernel@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210414144945.3460554-9-ltykernel@gmail.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-Rspamd-Queue-Id: 3557740002D7 X-Stat-Signature: yzm48npdmnhsrerkoawwsfwwg464a7fo X-Rspamd-Server: rspam02 Received-SPF: none (lst.de>: No applicable sender policy available) receiver=imf17; identity=mailfrom; envelope-from=""; helo=verein.lst.de; client-ip=213.95.11.211 X-HE-DKIM-Result: none/none X-HE-Tag: 1618414952-871541 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Apr 14, 2021 at 10:49:41AM -0400, Tianyu Lan wrote: > From: Tianyu Lan > > UIO HV driver should not load in the isolation VM for security reason. > Return ENOTSUPP in the hv_uio_probe() in the isolation VM. What is the "security reason"? After all a user can simply patch the code and just load it anyway..