On Fri, Nov 01, 2019 at 03:17:39PM +0800, Jason Wang wrote: > On 2019/10/31 下午10:01, Tiwei Bie wrote: > > This patch introduces a mdev based hardware vhost backend. > > This backend is built on top of the same abstraction used > > in virtio-mdev and provides a generic vhost interface for > > userspace to accelerate the virtio devices in guest. > > > > This backend is implemented as a mdev device driver on top > > of the same mdev device ops used in virtio-mdev but using > > a different mdev class id, and it will register the device > > as a VFIO device for userspace to use. Userspace can setup > > the IOMMU with the existing VFIO container/group APIs and > > then get the device fd with the device name. After getting > > the device fd of this device, userspace can use vhost ioctls > > to setup the backend. > > > > Signed-off-by: Tiwei Bie <tiwei.bie@xxxxxxxxx> > > --- > > This patch depends on below series: > > https://lkml.org/lkml/2019/10/30/62 > > > > v3 -> v4: > > - Rebase on top of virtio-mdev series v6; > > - Some minor tweaks and improvements; > > > > v2 -> v3: > > - Fix the return value (Jason); > > - Don't cache unnecessary information in vhost-mdev (Jason); > > - Get rid of the memset in open (Jason); > > - Add comments for VHOST_SET_MEM_TABLE, ... (Jason); > > - Filter out unsupported features in vhost-mdev (Jason); > > - Add _GET_DEVICE_ID ioctl (Jason); > > - Add _GET_CONFIG/_SET_CONFIG ioctls (Jason); > > - Drop _GET_QUEUE_NUM ioctl (Jason); > > - Fix the copy-paste errors in _IOW/_IOR usage; > > - Some minor fixes and improvements; > > > > v1 -> v2: > > - Replace _SET_STATE with _SET_STATUS (MST); > > - Check status bits at each step (MST); > > - Report the max ring size and max number of queues (MST); > > - Add missing MODULE_DEVICE_TABLE (Jason); > > - Only support the network backend w/o multiqueue for now; > > - Some minor fixes and improvements; > > - Rebase on top of virtio-mdev series v4; > > > > RFC v4 -> v1: > > - Implement vhost-mdev as a mdev device driver directly and > > connect it to VFIO container/group. (Jason); > > - Pass ring addresses as GPAs/IOVAs in vhost-mdev to avoid > > meaningless HVA->GPA translations (Jason); > > > > RFC v3 -> RFC v4: > > - Build vhost-mdev on top of the same abstraction used by > > virtio-mdev (Jason); > > - Introduce vhost fd and pass VFIO fd via SET_BACKEND ioctl (MST); > > > > RFC v2 -> RFC v3: > > - Reuse vhost's ioctls instead of inventing a VFIO regions/irqs > > based vhost protocol on top of vfio-mdev (Jason); > > > > RFC v1 -> RFC v2: > > - Introduce a new VFIO device type to build a vhost protocol > > on top of vfio-mdev; > > > > drivers/vfio/mdev/mdev_core.c | 20 ++ > > drivers/vfio/mdev/mdev_private.h | 1 + > > drivers/vhost/Kconfig | 12 + > > drivers/vhost/Makefile | 3 + > > drivers/vhost/mdev.c | 556 +++++++++++++++++++++++++++++++ > > include/linux/mdev.h | 5 + > > include/uapi/linux/vhost.h | 18 + > > include/uapi/linux/vhost_types.h | 8 + > > 8 files changed, 623 insertions(+) > > create mode 100644 drivers/vhost/mdev.c > > > > diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c > > index 22ca589750d8..109dbac01a8f 100644 > > --- a/drivers/vfio/mdev/mdev_core.c > > +++ b/drivers/vfio/mdev/mdev_core.c > > @@ -96,6 +96,26 @@ mdev_get_virtio_ops(struct mdev_device *mdev) > > } > > EXPORT_SYMBOL(mdev_get_virtio_ops); > > +/* Specify the vhost device ops for the mdev device, this > > + * must be called during create() callback for vhost mdev device. > > + */ > > +void mdev_set_vhost_ops(struct mdev_device *mdev, > > + const struct virtio_mdev_device_ops *vhost_ops) > > +{ > > + mdev_set_class(mdev, MDEV_CLASS_ID_VHOST); > > + mdev->vhost_ops = vhost_ops; > > +} > > +EXPORT_SYMBOL(mdev_set_vhost_ops); > > + > > +/* Get the vhost device ops for the mdev device. */ > > +const struct virtio_mdev_device_ops * > > +mdev_get_vhost_ops(struct mdev_device *mdev) > > +{ > > + WARN_ON(mdev->class_id != MDEV_CLASS_ID_VHOST); > > + return mdev->vhost_ops; > > +} > > +EXPORT_SYMBOL(mdev_get_vhost_ops); > > + > > struct device *mdev_dev(struct mdev_device *mdev) > > { > > return &mdev->dev; > > diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h > > index 7b47890c34e7..5597c846e52f 100644 > > --- a/drivers/vfio/mdev/mdev_private.h > > +++ b/drivers/vfio/mdev/mdev_private.h > > @@ -40,6 +40,7 @@ struct mdev_device { > > union { > > const struct vfio_mdev_device_ops *vfio_ops; > > const struct virtio_mdev_device_ops *virtio_ops; > > + const struct virtio_mdev_device_ops *vhost_ops; > > > Any reason why virtio_ops is not used for vhost here? I don't have a strong opinion on this. Will use virtio_ops directly. > > Other looks good. Thanks! > > Thanks > > _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
