linux-kernel - Re: [RFC 5/7] vdpa: Add new vdpa_config

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Message-ID: <CACGkMEtWhYPy==_OEEEO=cV7A5Wv-UGMt7FvPeMW4goNtO51FA@mail.gmail.com>
Date:   Tue, 26 Sep 2023 10:47:08 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Cindy Lu <lulu@...hat.com>
Cc:     mst@...hat.com, yi.l.liu@...el.com, jgg@...dia.com,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [RFC 5/7] vdpa: Add new vdpa_config_ops

On Sun, Sep 24, 2023 at 1:06 AM Cindy Lu <lulu@...hat.com> wrote:
>
> Add new vdpa_config_ops to support iommufd
>
> Signed-off-by: Cindy Lu <lulu@...hat.com>
> ---
>  include/linux/vdpa.h | 34 +++++++++++++++++++++++++++++++++-
>  1 file changed, 33 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 6d0f5e4e82c2..4ada5bd6f90e 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -5,6 +5,7 @@
>  #include <linux/kernel.h>
>  #include <linux/device.h>
>  #include <linux/interrupt.h>
> +#include <linux/iommufd.h>
>  #include <linux/vhost_iotlb.h>
>  #include <linux/virtio_net.h>
>  #include <linux/if_ether.h>
> @@ -91,6 +92,12 @@ struct vdpa_device {
>         struct vdpa_mgmt_dev *mdev;
>         unsigned int ngroups;
>         unsigned int nas;
> +       struct iommufd_access *iommufd_access;
> +       struct iommufd_device *iommufd_device;
> +       struct iommufd_ctx *iommufd_ictx;
> +       unsigned long *vq_bitmap;
> +       atomic_t iommufd_users;
> +       bool iommufd_attached;
>  };
>
>  /**
> @@ -282,6 +289,15 @@ struct vdpa_map_file {
>   *                             @iova: iova to be unmapped
>   *                             @size: size of the area
>   *                             Returns integer: success (0) or error (< 0)
> + * @bind_iommufd:              use vdpa_iommufd_physical_bind for an IOMMU
> + *                             backed device.
> + *                             otherwise use vdpa_iommufd_emulated_bind
> + * @unbind_iommufd:            use vdpa_iommufd_physical_unbind for an IOMMU
> + *                             backed device.
> + *                             otherwise, use vdpa_iommufd_emulated_unbind
> + * @attach_ioas:               use vdpa_iommufd_physical_attach_ioas for an
> + *                             IOMMU backed device.
> + * @detach_ioas:               Opposite of attach_ioas

Those should be marked as mandatory only for parents with specific
translations (e.g simulator and mlx5_vdpa).

Or anything I missed?

Thanks


>   * @free:                      Free resources that belongs to vDPA (optional)
>   *                             @vdev: vdpa device
>   */
> @@ -341,6 +357,12 @@ struct vdpa_config_ops {
>                          u64 iova, u64 size);
>         int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
>                               unsigned int asid);
> +       /* IOMMUFD ops */
> +       int (*bind_iommufd)(struct vdpa_device *vdev, struct iommufd_ctx *ictx,
> +                           u32 *out_device_id);
> +       void (*unbind_iommufd)(struct vdpa_device *vdev);
> +       int (*attach_ioas)(struct vdpa_device *vdev, u32 *pt_id);
> +       int (*detach_ioas)(struct vdpa_device *vdev);
>
>         /* Free device resources */
>         void (*free)(struct vdpa_device *vdev);
> @@ -510,4 +532,14 @@ struct vdpa_mgmt_dev {
>  int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev);
>  void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev);
>
> -#endif /* _LINUX_VDPA_H */
> +int vdpa_iommufd_physical_bind(struct vdpa_device *vdpa,
> +                              struct iommufd_ctx *ictx, u32 *out_device_id);
> +void vdpa_iommufd_physical_unbind(struct vdpa_device *vdpa);
> +int vdpa_iommufd_physical_attach_ioas(struct vdpa_device *vdpa, u32 *pt_id);
> +int vdpa_iommufd_emulated_bind(struct vdpa_device *vdpa,
> +                              struct iommufd_ctx *ictx, u32 *out_device_id);
> +void vdpa_iommufd_emulated_unbind(struct vdpa_device *vdpa);
> +int vdpa_iommufd_emulated_attach_ioas(struct vdpa_device *vdpa, u32 *pt_id);
> +int vdpa_iommufd_emulated_detach_ioas(struct vdpa_device *vdpa);
> +
> +#endif
> --
> 2.34.3
>