[Qemu-devel] Re: [kvm-devel] [PATCH 2/6] PCI DMA API

[Avi Kivity]

Anthony Liguori wrote:
> This patch introduces a PCI DMA API and some generic code to support other DMA
> APIs.  Two types are introduced: PhysIOVector and IOVector.  A DMA API
> maps a PhysIOVector, which is composed of target_phys_addr_t, into an IOVector,
> which is composed of void *.
>
> This enables zero-copy IO to be preformed without introducing assumptions of
> phys_ram_base.  This API is at the PCI device level to enable support of
> per-device IOMMU remapping.
>
>
> +
> +typedef struct IOVector
> +{
> +    int num;
> +    struct IOVectorElement {
> +       void *base;
> +       size_t len;
> +    } sg[0];
> +} IOVector;
> +
>   

Can we use 'struct iovec' for the element type (with accessors for 
setting base+len, and reading base or len, so we can substitute the 
Windows version for that platform)? That will allow using the vector 
without additional translation or casts.

--
error compiling committee.c: too many arguments to function