From: Cornelia Huck <cohuck@redhat.com>
To: Jason Wang <jasowang@redhat.com>
Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org,
intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com,
alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, maxime.coquelin@redhat.com,
cunming.liang@intel.com, zhihong.wang@intel.com,
rob.miller@broadcom.com, xiao.w.wang@intel.com,
haotian.wang@sifive.com, zhenyuw@linux.intel.com,
zhi.a.wang@intel.com, jani.nikula@linux.intel.com,
joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com,
airlied@linux.ie, daniel@ffwll.ch, farman@linux.ibm.com,
pasic@linux.ibm.com, sebott@linux.ibm.com, oberpar@linux.ibm.com,
heiko.carstens@de.ibm.com, gor@linux.ibm.com,
borntraeger@de.ibm.com, akrowiak@linux.ibm.com,
freude@linux.ibm.com, lingshan.zhu@intel.com, idos@mellanox.com,
eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com,
christophe.de.dinechin@gmail.com, kevin.tian@intel.com,
stefanha@redhat.com
Subject: Re: [PATCH V8 3/6] mdev: introduce device specific ops
Date: Tue, 5 Nov 2019 17:50:25 +0100 [thread overview]
Message-ID: <20191105175025.1a620844.cohuck@redhat.com> (raw)
In-Reply-To: <20191105093240.5135-4-jasowang@redhat.com>
On Tue, 5 Nov 2019 17:32:37 +0800
Jason Wang <jasowang@redhat.com> wrote:
> Currently, except for the create and remove, the rest of
> mdev_parent_ops is designed for vfio-mdev driver only and may not help
> for kernel mdev driver. With the help of class id, this patch
> introduces device specific callbacks inside mdev_device
> structure. This allows different set of callback to be used by
> vfio-mdev and virtio-mdev.
>
> Reviewed-by: Parav Pandit <parav@mellanox.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
> .../driver-api/vfio-mediated-device.rst | 35 +++++++++----
> MAINTAINERS | 1 +
> drivers/gpu/drm/i915/gvt/kvmgt.c | 18 ++++---
> drivers/s390/cio/vfio_ccw_ops.c | 18 ++++---
> drivers/s390/crypto/vfio_ap_ops.c | 14 +++--
> drivers/vfio/mdev/mdev_core.c | 24 ++++++++-
> drivers/vfio/mdev/mdev_private.h | 5 ++
> drivers/vfio/mdev/vfio_mdev.c | 37 ++++++-------
> include/linux/mdev.h | 43 ++++-----------
> include/linux/mdev_vfio_ops.h | 52 +++++++++++++++++++
> samples/vfio-mdev/mbochs.c | 20 ++++---
> samples/vfio-mdev/mdpy.c | 20 ++++---
> samples/vfio-mdev/mtty.c | 18 ++++---
> 13 files changed, 206 insertions(+), 99 deletions(-)
> create mode 100644 include/linux/mdev_vfio_ops.h
>
(...)
> @@ -172,10 +163,34 @@ that a driver should use to unregister itself with the mdev core driver::
>
> extern void mdev_unregister_device(struct device *dev);
>
> -It is also required to specify the class_id in create() callback through::
> +As multiple types of mediated devices may be supported, class id needs
> +to be specified in the create callback(). This could be done
The brackets should probably go behind 'create'?
> +explicitly for the device that does not use on mdev bus for its
"for devices that do not use the mdev bus" ?
But why wouldn't they? I feel like I've missed some discussion here :/
> +operation through:
>
> int mdev_set_class(struct mdev_device *mdev, u16 id);
>
> +For the device that uses on the mdev bus for its operation, the class
"For devices that use the mdev bus..."
But same comment as above.
> +should provide helper function to set class id and device specific
> +ops. E.g for vfio-mdev devices, the function to be called is::
> +
> + int mdev_set_vfio_ops(struct mdev_device *mdev,
> + const struct mdev_vfio_device_ops *vfio_ops);
> +
> +The class id (set by this function to MDEV_CLASS_ID_VFIO) is used to
> +match a device with an mdev driver via its id table. The device
> +specific callbacks (specified in *vfio_ops) are obtainable via
> +mdev_get_vfio_ops() (for use by the mdev bus driver). A vfio-mdev
> +device (class id MDEV_CLASS_ID_VFIO) uses the following
> +device-specific ops:
> +
> +* open: open callback of vfio mediated device
> +* close: close callback of vfio mediated device
> +* ioctl: ioctl callback of vfio mediated device
> +* read : read emulation callback
> +* write: write emulation callback
> +* mmap: mmap emulation callback
> +
> Mediated Device Management Interface Through sysfs
> ==================================================
Otherwise, looks good.
next prev parent reply other threads:[~2019-11-05 16:50 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-05 9:32 [PATCH V8 0/6] mdev based hardware virtio offloading support Jason Wang
2019-11-05 9:32 ` [PATCH V8 1/6] mdev: class id support Jason Wang
2019-11-05 16:03 ` Cornelia Huck
2019-11-05 9:32 ` [PATCH V8 2/6] modpost: add support for mdev class id Jason Wang
2019-11-05 16:06 ` Cornelia Huck
2019-11-05 9:32 ` [PATCH V8 3/6] mdev: introduce device specific ops Jason Wang
2019-11-05 16:50 ` Cornelia Huck [this message]
2019-11-05 17:44 ` Alex Williamson
2019-11-05 18:28 ` Cornelia Huck
2019-11-06 3:48 ` Jason Wang
2019-11-05 9:32 ` [PATCH V8 4/6] mdev: introduce virtio device and its device ops Jason Wang
2019-11-05 16:57 ` Cornelia Huck
2019-11-05 17:47 ` Alex Williamson
2019-11-06 3:51 ` Jason Wang
2019-11-05 9:32 ` [PATCH V8 5/6] virtio: introduce a mdev based transport Jason Wang
2019-11-05 18:33 ` Cornelia Huck
2019-11-05 9:32 ` [PATCH V8 6/6] docs: sample driver to demonstrate how to implement virtio-mdev framework Jason Wang
2019-11-05 18:35 ` Cornelia Huck
2019-11-05 17:58 ` [PATCH V8 0/6] mdev based hardware virtio offloading support Alex Williamson
2019-11-06 3:56 ` Jason Wang
2019-11-06 19:03 ` Alex Williamson
2019-11-06 19:25 ` Michael S. Tsirkin
2019-11-06 21:13 ` Alex Williamson
2019-11-07 4:11 ` Jason Wang
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