linux-kernel - Re: [PATCH v2 00/10] RFC: NVME MDEV

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Date:   Thu, 9 May 2019 07:49:17 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Stefan Hajnoczi <stefanha@...il.com>
Cc:     Maxim Levitsky <mlevitsk@...hat.com>,
        Christoph Hellwig <hch@....de>, Fam Zheng <fam@...hon.net>,
        "Busch, Keith" <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Liang, Cunming" <cunming.liang@...el.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jens Axboe <axboe@...com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Liu, Changpeng" <changpeng.liu@...el.com>,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>,
        Amnon Ilan <ailan@...hat.com>, John Ferlan <jferlan@...hat.com>
Subject: Re: [PATCH v2 00/10] RFC: NVME MDEV

On Thu, May 09, 2019 at 02:12:55AM -0700, Stefan Hajnoczi wrote:
> On Mon, May 06, 2019 at 12:04:06PM +0300, Maxim Levitsky wrote:
> > On top of that, it is expected that newer hardware will support the PASID based
> > device subdivision, which will allow us to _directly_ pass through the
> > submission queues of the device and _force_ us to use the NVME protocol for the
> > frontend.
> 
> I don't understand the PASID argument.  The data path will be 100%
> passthrough and this driver won't be necessary.

We still need a non-passthrough component to handle slow path,
non-doorbell controller registers and admin queue. That doesn't
necessarily need to be a kernel driver, though.