On 2019/9/17 上午9:02, Tiwei Bie wrote:
This RFC is to demonstrate below ideas,
a) Build vhost-mdev on top of the same abstraction defined in
the virtio-mdev series [1];
b) Introduce /dev/vhost-mdev to do vhost ioctls and support
setting mdev device as backend;
Now the userspace API looks like this:
- Userspace generates a compatible mdev device;
- Userspace opens this mdev device with VFIO API (including
doing IOMMU programming for this mdev device with VFIO's
container/group based interface);
- Userspace opens /dev/vhost-mdev and gets vhost fd;
- Userspace uses vhost ioctls to setup vhost (userspace should
do VHOST_MDEV_SET_BACKEND ioctl with VFIO group fd and device
fd first before doing other vhost ioctls);
Only compile test has been done for this series for now.
RFCv3: https://patchwork.kernel.org/patch/11117785/
[1] https://lkml.org/lkml/2019/9/10/135
Thanks a lot for the patches.
Per Michael request, the API in [1] might need some tweak, I want to
introduce some device specific parent_ops instead of vfio specific one.
This RFC has been posted at https://lkml.org/lkml/2019/9/12/151.
Tiwei Bie (3):
vfio: support getting vfio device from device fd
vfio: support checking vfio driver by device ops
vhost: introduce mdev based hardware backend
drivers/vfio/mdev/vfio_mdev.c | 3 +-
drivers/vfio/vfio.c | 32 +++
drivers/vhost/Kconfig | 9 +
drivers/vhost/Makefile | 3 +
drivers/vhost/mdev.c | 462 +++++++++++++++++++++++++++++++
drivers/vhost/vhost.c | 39 ++-
drivers/vhost/vhost.h | 6 +
include/linux/vfio.h | 11 +
include/uapi/linux/vhost.h | 10 +
include/uapi/linux/vhost_types.h | 5 +
10 files changed, 573 insertions(+), 7 deletions(-)
create mode 100644 drivers/vhost/mdev.c
