From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ale.deltatee.com (ale.deltatee.com [207.54.116.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id B9E1821E49023 for ; Tue, 13 Mar 2018 13:40:35 -0700 (PDT) References: <20180312193525.2855-1-logang@deltatee.com> <20180312193525.2855-2-logang@deltatee.com> <59fd2f5d-177f-334a-a9c4-0f8a6ec7c303@codeaurora.org> <24d8e5c2-065d-8bde-3f5d-7f158be9c578@deltatee.com> <52cbbbc4-c488-f83f-8d02-14d455b4efd7@codeaurora.org> <3e738f95-d73c-4182-2fa1-8664aafb1ab7@deltatee.com> <703aa92c-0c1c-4852-5887-6f6e6ccde0fb@codeaurora.org> <3ea80992-a0fc-08f2-d93d-ae0ec4e3f4ce@codeaurora.org> From: Logan Gunthorpe Message-ID: <4eb6850c-df1b-fd44-3ee0-d43a50270b53@deltatee.com> Date: Tue, 13 Mar 2018 14:46:31 -0600 MIME-Version: 1.0 In-Reply-To: <3ea80992-a0fc-08f2-d93d-ae0ec4e3f4ce@codeaurora.org> Content-Language: en-US Subject: Re: [PATCH v3 01/11] PCI/P2PDMA: Support peer-to-peer memory List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: Sinan Kaya , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org, linux-nvdimm@lists.01.org, linux-block@vger.kernel.org Cc: Jens Axboe , Benjamin Herrenschmidt , Alex Williamson , Keith Busch , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Jason Gunthorpe , Bjorn Helgaas , Max Gurtovoy , Christoph Hellwig List-ID: On 13/03/18 01:53 PM, Sinan Kaya wrote: > I agree disabling globally would be bad. Somebody can always say I have > ten switches on my system. I want to do peer-to-peer on one switch only. Now, > this change weakened security for the other switches that I had no intention > with doing P2P. > > Isn't this a problem? Well, if it's a problem for someone they'll have to solve it. We're targeting JBOFs that have no use for ACS / IOMMU groups at all. > Can we specify the BDF of the downstream device we want P2P with during boot via > kernel command line? That's a painful configuration burden. And then things might stop working if you change your topology at all and now have to change boot parameters. Logan _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm