netdev - Re: [net-next v2 1/1] virtual-bus: Implementation of Virtual Bus

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Message-ID: <20191120232320-mutt-send-email-mst@kernel.org>
Date:   Wed, 20 Nov 2019 23:24:03 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Parav Pandit <parav@...lanox.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        Dave Ertman <david.m.ertman@...el.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, nhorman@...hat.com,
        sassmann@...hat.com, Kiran Patil <kiran.patil@...el.com>,
        Tiwei Bie <tiwei.bie@...el.com>
Subject: Re: [net-next v2 1/1] virtual-bus: Implementation of Virtual Bus

On Wed, Nov 20, 2019 at 11:03:57PM -0400, Jason Gunthorpe wrote:
> Frankly, when I look at what this virtio stuff is doing I see RDMA:
>  - Both have a secure BAR pages for mmaping to userspace (or VM)
>  - Both are prevented from interacting with the device at a register
>    level and must call to the kernel - ie creating resources is a
>    kernel call - for security.
>  - Both create command request/response rings in userspace controlled
>    memory and have HW DMA to read requests and DMA to generate responses
>  - Both allow the work on the rings to DMA outside the ring to
>    addresses controlled by userspace.
>  - Both have to support a mixture of HW that uses on-device security
>    or IOMMU based security.

The main difference is userspace/drivers need to be portable with
virtio.

-- 
MST