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Message-ID: <980958b0-b541-6e37-830e-f2b82358845b@redhat.com>
Date: Tue, 17 Sep 2019 09:29:42 +0800
From: Jason Wang <jasowang@...hat.com>
To: Tiwei Bie <tiwei.bie@...el.com>, mst@...hat.com,
alex.williamson@...hat.com, maxime.coquelin@...hat.com
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
dan.daly@...el.com, cunming.liang@...el.com,
zhihong.wang@...el.com, lingshan.zhu@...el.com
Subject: Re: [RFC v4 0/3] vhost: introduce mdev based hardware backend
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
>
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