Messages in this thread | | | Date | Sat, 26 Sep 2020 08:51:23 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH 4/5] misc: vop: set VIRTIO_F_ACCESS_PLATFORM for nocoherent platform |
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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.
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