Re: [RFC v2 5/9] vhost-vdpa: implement vhost-vdpa backend

[Stefan Hajnoczi]

On Sat, May 09, 2020 at 12:32:14AM +0800, Cindy Lu wrote:
> From: Tiwei Bie <address@hidden>
> 
> Currently we have 2 types of vhost backends in QEMU: vhost kernel and
> vhost-user. The above patch provides a generic device for vDPA purpose,
> this vDPA device exposes to user space a non-vendor-specific configuration
> interface for setting up a vhost HW accelerator, this patch set introduces
> a third vhost backend called vhost-vdpa based on the vDPA interface.
> 
> Vhost-vdpa usage:
> 
>   qemu-system-x86_64 -cpu host -enable-kvm \
>     ......
>   -netdev type=vhost-vdpa,vhostdev=/dev/vhost-vdpa-id,id=vhost-vdpa0 \
>   -device virtio-net-pci,netdev=vhost-vdpa0,page-per-vq=on \

I haven't looked at vDPA in depth. What is different here compared to
the existing vhost-backend.c kernel backend?

It seems to be making the same ioctls calls so I wonder if it makes
sense to share the vhost-backend.c kernel code?

Stefan

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