Re: [PATCH v11 11/12] vduse: Introduce VDUSE - vDPA Device in Userspace

[Jason Wang]

在 2021/8/18 下午8:06, Xie Yongji 写道:
> This VDUSE driver enables implementing software-emulated vDPA
> devices in userspace. The vDPA device is created by
> ioctl(VDUSE_CREATE_DEV) on /dev/vduse/control. Then a char device
> interface (/dev/vduse/$NAME) is exported to userspace for device
> emulation.
>
> In order to make the device emulation more secure, the device's
> control path is handled in kernel. A message mechnism is introduced
> to forward some dataplane related control messages to userspace.
>
> And in the data path, the DMA buffer will be mapped into userspace
> address space through different ways depending on the vDPA bus to
> which the vDPA device is attached. In virtio-vdpa case, the MMU-based
> software IOTLB is used to achieve that. And in vhost-vdpa case, the
> DMA buffer is reside in a userspace memory region which can be shared
> to the VDUSE userspace processs via transferring the shmfd.
>
> For more details on VDUSE design and usage, please see the follow-on
> Documentation commit.
>
> Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>


Acked-by: Jason Wang <jasowang@xxxxxxxxxx>