On Wed, Aug 25, 2021 at 2:10 AM Michael S. Tsirkin [off-list ref] wrote:

On Wed, Aug 18, 2021 at 08:06:41PM +0800, Xie Yongji wrote:

quoted

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 <redacted>

Build bot seems unhappy with this patch.

Yes, this is because the series relies on the unmerged patch:

https://lore.kernel.org/lkml/20210705071910.31965-1-jasowang@redhat.com/ (local)

Do I need to remove this dependency in the next version?

Thanks,
Yongji
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu