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

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Message-ID: <20190117152142.GB20359@infradead.org>
Date:   Thu, 17 Jan 2019 07:21:42 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     Arnd Bergmann <arnd@...db.de>, 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 04:19:06PM +0100, Vincent Whitchurch wrote:
> On the RC, a vop-host-backend driver (PCI driver) sets up some shared
> memory area which the RC and the endpoint can use to communicate the
> location of the MIC device descriptors and other information such as the
> MSI address.  It implements vop callbacks to allow the vop framework to
> obtain the address of the MIC descriptors and send/receive interrupts
> to/from the guest.

Why would we require any work on the RC / host side?  A properly
setup software controlled virtio device should just show up as a
normal PCIe device, and the virtio-pci device should bind to it.