On 07/30/2018 02:54 PM, Christoph Hellwig wrote:
>> +/*
>> + * Virtio direct mapping DMA API operations structure
>> + *
>> + * This defines DMA API structure for all virtio devices which would not
>> + * either bring in their own DMA OPS from architecture or they would not
>> + * like to use archi
> +/*
> + * Virtio direct mapping DMA API operations structure
> + *
> + * This defines DMA API structure for all virtio devices which would not
> + * either bring in their own DMA OPS from architecture or they would not
> + * like to use architecture specific IOMMU based DMA OPS because QEMU
> + *
Current implementation of DMA API inside virtio core calls device's DMA OPS
callback functions when the flag VIRTIO_F_IOMMU_PLATFORM flag is set. But
in absence of the flag, virtio core falls back calling basic transformation
of the incoming SG addresses as GPA. Going forward virtio should only cal
