From: Jason Wang <jasowang@redhat.com>
To: Tiwei Bie <tiwei.bie@intel.com>,
mst@redhat.com, alex.williamson@redhat.com,
maxime.coquelin@redhat.com
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, dan.daly@intel.com,
cunming.liang@intel.com, zhihong.wang@intel.com,
lingshan.zhu@intel.com
Subject: Re: [RFC v4 0/3] vhost: introduce mdev based hardware backend
Date: Tue, 17 Sep 2019 09:29:42 +0800 [thread overview]
Message-ID: <980958b0-b541-6e37-830e-f2b82358845b@redhat.com> (raw)
In-Reply-To: <20190917010204.30376-1-tiwei.bie@intel.com>
On 2019/9/17 上午9:02, Tiwei Bie wrote:
> 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
Thanks a lot for the patches.
Per Michael request, the API in [1] might need some tweak, I want to
introduce some device specific parent_ops instead of vfio specific one.
This RFC has been posted at https://lkml.org/lkml/2019/9/12/151.
>
> 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
>
next prev parent reply other threads:[~2019-09-17 1:29 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-17 1:02 [RFC v4 0/3] vhost: introduce mdev based hardware backend Tiwei Bie
2019-09-17 1:02 ` [RFC v4 1/3] vfio: support getting vfio device from device fd Tiwei Bie
2019-09-17 1:02 ` [RFC v4 2/3] vfio: support checking vfio driver by device ops Tiwei Bie
2019-09-17 1:02 ` [RFC v4 3/3] vhost: introduce mdev based hardware backend Tiwei Bie
2019-09-17 7:26 ` Jason Wang
2019-09-20 4:21 ` Tiwei Bie
2019-09-17 1:29 ` Jason Wang [this message]
2019-09-17 3:32 ` [RFC v4 0/3] " Jason Wang
2019-09-17 10:58 ` Tiwei Bie
2019-09-18 5:51 ` Jason Wang
2019-09-18 14:32 ` Michael S. Tsirkin
2019-09-19 13:08 ` Jason Wang
2019-09-19 15:45 ` Tiwei Bie
2019-09-20 0:59 ` Jason Wang
2019-09-20 1:30 ` Jason Wang
2019-09-20 2:16 ` Tiwei Bie
2019-09-20 2:36 ` Jason Wang
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