linux-kernel - Re: [PATCH 0/8] Virtio-over-PCIe on non-MIC

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Date:   Thu, 17 Jan 2019 17:34:10 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     sudeep.dutt@...el.com, ashutosh.dixit@...el.com,
        gregkh <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-ntb@...glegroups.com, Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>
Subject: Re: [PATCH 0/8] Virtio-over-PCIe on non-MIC

On Thu, Jan 17, 2019 at 5:26 PM Vincent Whitchurch
<vincent.whitchurch@...s.com> wrote:
> On Thu, Jan 17, 2019 at 04:53:25PM +0100, Arnd Bergmann wrote:
> > On Thu, Jan 17, 2019 at 4:19 PM Vincent Whitchurch

> > Ok, this seems fine so far. So the vop-host-backend is a regular PCI
> > driver that implements the VOP protocol from the host side, and it
> > can talk to either a MIC, or another guest-backend written for the PCI-EP
> > framework to implement the same protocol, right?
>
> Yes, but just to clarify:  the placement of the device page and the way
> to communicate the location of the device page address and any other
> information needed by the guest-backend are hardware-specific so there
> is no generic vop-host-backend implementation which can talk to both a
> MIC and to something else.

I'm not sure I understand what is hardware specific about it. Shouldn't
it be possible to define at least a vop-host-backend that could work with
any guest-backend running on the PCI-EP framework?

This may have to be different from the interface used on MIC, but
generally speaking that is what I expect from a PCI device.

       Arnd