Messages in this thread | | | From | Tiwei Bie <> | Subject | [RFC v4 0/3] vhost: introduce mdev based hardware backend | Date | Tue, 17 Sep 2019 09:02:01 +0800 |
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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
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
-- 2.17.1
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