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Date: Fri, 5 Oct 2018 09:10:44 +0200
From: Christoph Hellwig <hch@lst.de>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: 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,
	Stephen Bates <sbates@raithlin.com>, Christoph Hellwig <hch@lst.de>,
	Keith Busch <keith.busch@intel.com>,
	Sagi Grimberg <sagi@grimberg.me>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Jason Gunthorpe <jgg@mellanox.com>,
	Max Gurtovoy <maxg@mellanox.com>,
	Dan Williams <dan.j.williams@intel.com>,
	=?iso-8859-1?B?Suly9G1l?= Glisse <jglisse@redhat.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Alex Williamson <alex.williamson@redhat.com>,
	Christian =?iso-8859-1?Q?K=F6nig?= <christian.koenig@amd.com>,
	Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH v9 11/13] nvme-pci: Add a quirk for a pseudo CMB
Message-ID: <20181005071044.GB23834@lst.de>
References: <20181004212747.6301-1-logang@deltatee.com> <20181004212747.6301-12-logang@deltatee.com>
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In-Reply-To: <20181004212747.6301-12-logang@deltatee.com>
List-ID: <linux-block@vger.kernel.org>

On Thu, Oct 04, 2018 at 03:27:45PM -0600, Logan Gunthorpe wrote:
> Introduce a quirk to use CMB-like memory on older devices that have
> an exposed BAR but do not advertise support for using CMBLOC and
> CMBSIZE.
> 
> We'd like to use some of these older cards to test P2P memory.

I can't sat that I really like adding support for non-standardized
"features" (vs bugs) in the nvme driver.