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 A3CC7C352A1 for ; Wed, 7 Dec 2022 16:35:22 +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=ev1V7EMVbOz+sX0QM7wf1hPTVfYf6nYQ8XRYUcsAV9g=; b=pHVOjscmjNZkYhTDIsH4/uwhjC 9zDHKmo+9nT0ZpGTF1NchXg/JZBu5biJ2tqTaRfEuTLx7YWsuOvRNexohO2aFLFqaUucOCvevgEvs IiuChlVUmHKKCie9MItq/9j54c8je1r3nnIJHrMxGvQWs9DlNbMM6uXpdgr588yvBvW71YCEDsNAP /a6PVkTP2HmD/CwQnlRhrkCq+5OlAqOfKfMjLdkDjBUNbWvJnix18JIAAGApVtQ4hz75nBsLuFMWm L+U0+AhVz+D0kLQg7N2ySAmzcksiikhsVZnwpdknrut1HAfpOY3RYzDYmAwv/pEeDEfx700Qop12i 9aHcDnTg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1p2xOB-006knB-7n; Wed, 07 Dec 2022 16:35:19 +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 1p2xO7-006ker-J6 for linux-nvme@lists.infradead.org; Wed, 07 Dec 2022 16:35:17 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id DC7F367373; Wed, 7 Dec 2022 17:35:06 +0100 (CET) Date: Wed, 7 Dec 2022 17:35:06 +0100 From: Christoph Hellwig To: Max Gurtovoy Cc: Christoph Hellwig , Jason Gunthorpe , Lei Rao , 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, kevin.tian@intel.com, mjrosato@linux.ibm.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, kvm@vger.kernel.org, eddie.dong@intel.com, yadong.li@intel.com, yi.l.liu@intel.com, Konrad.wilk@oracle.com, stephen@eideticom.com, hang.yuan@intel.com Subject: Re: [RFC PATCH 1/5] nvme-pci: add function nvme_submit_vf_cmd to issue admin commands for VF driver. Message-ID: <20221207163506.GA2010@lst.de> References: <20221206135810.GA27689@lst.de> <20221206153811.GB2266@lst.de> <20221206165503.GA8677@lst.de> <20221207075415.GB2283@lst.de> <4f11e0bb-e090-bf9b-4f98-578273865200@nvidia.com> <20221207134644.GB21691@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-20221207_083515_797354_813C8F22 X-CRM114-Status: GOOD ( 15.16 ) 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 Wed, Dec 07, 2022 at 04:50:00PM +0200, Max Gurtovoy wrote: > When we perform step #3 we are narrowing it's scope and maybe some caps > that you're concerned of. After this setting, the controlled function is in > LM mode (we should define what does that mean in order to be able to > migrate it correctly) and the controlling function is the migration master > of it. Both can be aware of that. The only one that can master the > controlled function is the controlling function in LM mode. Thus, it will > be easy to keep that handle inside the kernel for VFs and for MDEVs as > well. Maybe. So you'd introduce a kernel linkage that both side would have to be part of?