linux-kernel - Re: [PATCH v9 11/13] nvme-pci: Add a quirk for a pseudo CMB

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Date:   Fri, 5 Oct 2018 09:10:44 +0200
From:   Christoph Hellwig <hch@....de>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-block@...r.kernel.org,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Christian König <christian.koenig@....com>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v9 11/13] nvme-pci: Add a quirk for a pseudo CMB

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.