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 V4 5/6] virtio: introduce a mdev based transport
Date: Fri, 18 Oct 2019 16:20:07 +0200 [thread overview]
Message-ID: <20191018162007.31631039.cohuck@redhat.com> (raw)
In-Reply-To: <20191017104836.32464-6-jasowang@redhat.com>
On Thu, 17 Oct 2019 18:48:35 +0800
Jason Wang <jasowang@redhat.com> wrote:
> This patch introduces a new mdev transport for virtio. This is used to
> use kernel virtio driver to drive the mediated device that is capable
> of populating virtqueue directly.
>
> A new virtio-mdev driver will be registered to the mdev bus, when a
> new virtio-mdev device is probed, it will register the device with
> mdev based config ops. This means it is a software transport between
> mdev driver and mdev device. The transport was implemented through
> device specific ops which is a part of mdev_parent_ops now.
>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
> drivers/virtio/Kconfig | 7 +
> drivers/virtio/Makefile | 1 +
> drivers/virtio/virtio_mdev.c | 409 +++++++++++++++++++++++++++++++++++
> 3 files changed, 417 insertions(+)
(...)
> +static int virtio_mdev_probe(struct device *dev)
> +{
> + struct mdev_device *mdev = mdev_from_dev(dev);
> + const struct virtio_mdev_device_ops *ops = mdev_get_dev_ops(mdev);
> + struct virtio_mdev_device *vm_dev;
> + int rc;
> +
> + vm_dev = devm_kzalloc(dev, sizeof(*vm_dev), GFP_KERNEL);
> + if (!vm_dev)
> + return -ENOMEM;
> +
> + vm_dev->vdev.dev.parent = dev;
> + vm_dev->vdev.dev.release = virtio_mdev_release_dev;
> + vm_dev->vdev.config = &virtio_mdev_config_ops;
> + vm_dev->mdev = mdev;
> + INIT_LIST_HEAD(&vm_dev->virtqueues);
> + spin_lock_init(&vm_dev->lock);
> +
> + vm_dev->version = ops->get_mdev_features(mdev);
> + if (vm_dev->version != VIRTIO_MDEV_F_VERSION_1) {
> + dev_err(dev, "VIRTIO_MDEV_F_VERSION_1 is mandatory\n");
> + return -ENXIO;
> + }
Hm, so how is that mdev features interface supposed to work? If
VIRTIO_MDEV_F_VERSION_1 is a bit, I would expect this code to test for
its presence, and not for identity.
What will happen if we come up with a version 2? If this is backwards
compatible, will both version 2 and version 1 be set?
> +
> + vm_dev->vdev.id.device = ops->get_device_id(mdev);
> + if (vm_dev->vdev.id.device == 0)
> + return -ENODEV;
> +
> + vm_dev->vdev.id.vendor = ops->get_vendor_id(mdev);
> + rc = register_virtio_device(&vm_dev->vdev);
> + if (rc)
> + put_device(dev);
> + else
> + dev_set_drvdata(dev, vm_dev);
> +
> + return rc;
> +}
(...)
next prev parent reply other threads:[~2019-10-18 14:20 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-17 10:48 [PATCH V4 0/6] mdev based hardware virtio offloading support Jason Wang
2019-10-17 10:48 ` [PATCH V4 1/6] mdev: class id support Jason Wang
2019-10-20 23:25 ` Parav Pandit
2019-10-17 10:48 ` [PATCH V4 2/6] modpost: add support for mdev class id Jason Wang
2019-10-20 23:25 ` Parav Pandit
2019-10-17 10:48 ` [PATCH V4 3/6] mdev: introduce device specific ops Jason Wang
2019-10-17 15:07 ` Cornelia Huck
2019-10-17 17:53 ` Alex Williamson
2019-10-18 7:44 ` Cornelia Huck
2019-10-18 7:34 ` Jason Wang
2019-10-20 23:41 ` Parav Pandit
2019-10-21 6:02 ` Jason Wang
2019-10-17 10:48 ` [PATCH V4 4/6] mdev: introduce virtio device and its device ops Jason Wang
2019-10-17 17:53 ` Alex Williamson
2019-10-18 7:35 ` Jason Wang
2019-10-18 9:46 ` Cornelia Huck
2019-10-18 10:55 ` Jason Wang
2019-10-18 13:30 ` Cornelia Huck
2019-10-21 5:36 ` Jason Wang
2019-10-18 9:46 ` Tiwei Bie
2019-10-18 10:57 ` Jason Wang
2019-10-17 10:48 ` [PATCH V4 5/6] virtio: introduce a mdev based transport Jason Wang
2019-10-18 14:20 ` Cornelia Huck [this message]
2019-10-21 5:59 ` Jason Wang
2019-10-21 9:36 ` Cornelia Huck
2019-10-21 10:13 ` Jason Wang
2019-10-17 10:48 ` [PATCH V4 6/6] docs: sample driver to demonstrate how to implement virtio-mdev framework Jason Wang
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