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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E9AD2C4332F for ; Mon, 12 Dec 2022 07:41:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=6x7TSxNmieg/hDD4iVXH6NoUPGv5+rw6GgBw0NMISD4=; b=bxq1PzkkMogaebzaTufmAMN1Mu gCCys1wAXbYWRX7yoJPfvfAXwC7P1cxw8Zc46FhiyPvC28C1kJsz+KTwCUtYClKZI8Csr+oODO0hO ch7nWsYEGoaG3BpeVdx4gY/iG/9+lXjIp5lcW9X9HYg7m0QHzN7jS/yXmcQwIufSSW8MRhOKzNaEv srjRRlM26GFPADQT6wIsPyNITaoPgh59kHJf1ichtQIPCeu+izKSqTQ14E8wc5J4W4yX5jLCm3vpt pjkoQQ0wyS6uiyw5I45VWWM3c06/B6itiuJqLjotr+y4/ylQ8QgkIvljM0gn4IOu5hUIXiRWiTvwh dfRApfuw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1p4dRa-009Z24-8p; Mon, 12 Dec 2022 07:41:46 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1p4dRX-009YwG-FW for linux-nvme@lists.infradead.org; Mon, 12 Dec 2022 07:41:44 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 2182A68AA6; Mon, 12 Dec 2022 08:41:35 +0100 (CET) Date: Mon, 12 Dec 2022 08:41:34 +0100 From: Christoph Hellwig To: "Tian, Kevin" Cc: Christoph Hellwig , Max Gurtovoy , Jason Gunthorpe , "Rao, Lei" , "kbusch@kernel.org" , "axboe@fb.com" , "kch@nvidia.com" , "sagi@grimberg.me" , "alex.williamson@redhat.com" , "cohuck@redhat.com" , "yishaih@nvidia.com" , "shameerali.kolothum.thodi@huawei.com" , "mjrosato@linux.ibm.com" , "linux-kernel@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "kvm@vger.kernel.org" , "Dong, Eddie" , "Li, Yadong" , "Liu, Yi L" , "Wilk, Konrad" , "stephen@eideticom.com" , "Yuan, Hang" Subject: Re: [RFC PATCH 1/5] nvme-pci: add function nvme_submit_vf_cmd to issue admin commands for VF driver. Message-ID: <20221212074134.GA11162@lst.de> References: <20221206135810.GA27689@lst.de> <20221206153811.GB2266@lst.de> <20221206165503.GA8677@lst.de> <2975e217-749b-6929-cd2d-4b6276ef33d1@nvidia.com> <20221207075834.GC2283@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221211_234143_690682_9C959043 X-CRM114-Status: GOOD ( 12.70 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Fri, Dec 09, 2022 at 02:11:21AM +0000, Tian, Kevin wrote: > > It can't. That's the whole point. The controlled function that is > > being migrate must be absolutely unaware of that (except for things > > like quiescing access or FLRs that could happen anyway), because > > otherwise your have a fundamental information leak. > > > > Can you elaborate which information is leaked? Information about what controllers exist, what namespaces exist, etc.