linux-kernel - Re: [PATCH 4/5] misc: vop: set VIRTIO_F_ACCESS

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Date:   Sat, 26 Sep 2020 08:51:23 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Sherry Sun <sherry.sun@....com>
Cc:     sudeep.dutt@...el.com, ashutosh.dixit@...el.com, arnd@...db.de,
        gregkh@...uxfoundation.org, wang.yi59@....com.cn,
        huang.zijiang@....com.cn, rikard.falkeborn@...il.com,
        lee.jones@...aro.org, mst@...hat.com, linux-kernel@...r.kernel.org,
        linux-imx@....com
Subject: Re: [PATCH 4/5] misc: vop: set VIRTIO_F_ACCESS_PLATFORM for
 nocoherent platform

On Fri, Sep 25, 2020 at 03:26:29PM +0800, Sherry Sun wrote:
> Set VIRTIO_F_ACCESS_PLATFORM feature for nocoherent platform, since
> it needs the DMA API for virtio.

Given that VOP is a plug-in PCIe card VIRTIO_F_ACCESS_PLATFORM must
always be set, as the DMA mapping details are not something the
virtio implementation decides on, but the host PCIe/iommu
implementation.