Re: [PATCH 0/5] vDPA support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On 2020/1/21 下午4:44, Tian, Kevin wrote:
From: Jason Wang
Sent: Thursday, January 16, 2020 8:42 PM

Hi all:

Based on the comments and discussion for mdev based hardware virtio
offloading support[1]. A different approach to support vDPA device is
proposed in this series.
Can you point to the actual link which triggered the direction change?
A quick glimpse in that thread doesn't reveal such information...


Right, please see this link, the actual discussion happens on the thread of virtual-bus for some reasons...

https://patchwork.ozlabs.org/patch/1195895/

Thanks



Instead of leveraging VFIO/mdev which may not work for some
vendors. This series tries to introduce a dedicated vDPA bus and
leverage vhost for userspace drivers. This help for the devices that
are not fit for VFIO and may reduce the conflict when try to propose a
bus template for virtual devices in [1].

The vDPA support is split into following parts:

1) vDPA core (bus, device and driver abstraction)
2) virtio vDPA transport for kernel virtio driver to control vDPA
    device
3) vhost vDPA bus driver for userspace vhost driver to control vDPA
    device
4) vendor vDPA drivers
5) management API

Both 1) and 2) are included in this series. Tiwei will work on part
3). For 4), Ling Shan will work and post IFCVF driver. For 5) we leave
it to vendor to implement, but it's better to come into an agreement
for management to create/configure/destroy vDPA device.

The sample driver is kept but renamed to vdap_sim. An on-chip IOMMU
implementation is added to sample device to make it work for both
kernel virtio driver and userspace vhost driver. It implements a sysfs
based management API, but it can switch to any other (e.g devlink) if
necessary.

Please refer each patch for more information.

Comments are welcomed.

[1] https://lkml.org/lkml/2019/11/18/261

Jason Wang (5):
   vhost: factor out IOTLB
   vringh: IOTLB support
   vDPA: introduce vDPA bus
   virtio: introduce a vDPA based transport
   vdpasim: vDPA device simulator

  MAINTAINERS                    |   2 +
  drivers/vhost/Kconfig          |   7 +
  drivers/vhost/Kconfig.vringh   |   1 +
  drivers/vhost/Makefile         |   2 +
  drivers/vhost/net.c            |   2 +-
  drivers/vhost/vhost.c          | 221 +++------
  drivers/vhost/vhost.h          |  36 +-
  drivers/vhost/vhost_iotlb.c    | 171 +++++++
  drivers/vhost/vringh.c         | 434 +++++++++++++++++-
  drivers/virtio/Kconfig         |  15 +
  drivers/virtio/Makefile        |   2 +
  drivers/virtio/vdpa/Kconfig    |  26 ++
  drivers/virtio/vdpa/Makefile   |   3 +
  drivers/virtio/vdpa/vdpa.c     | 141 ++++++
  drivers/virtio/vdpa/vdpa_sim.c | 796
+++++++++++++++++++++++++++++++++
  drivers/virtio/virtio_vdpa.c   | 400 +++++++++++++++++
  include/linux/vdpa.h           | 191 ++++++++
  include/linux/vhost_iotlb.h    |  45 ++
  include/linux/vringh.h         |  36 ++
  19 files changed, 2327 insertions(+), 204 deletions(-)
  create mode 100644 drivers/vhost/vhost_iotlb.c
  create mode 100644 drivers/virtio/vdpa/Kconfig
  create mode 100644 drivers/virtio/vdpa/Makefile
  create mode 100644 drivers/virtio/vdpa/vdpa.c
  create mode 100644 drivers/virtio/vdpa/vdpa_sim.c
  create mode 100644 drivers/virtio/virtio_vdpa.c
  create mode 100644 include/linux/vdpa.h
  create mode 100644 include/linux/vhost_iotlb.h

--
2.19.1

_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization




[Index of Archives]     [KVM Development]     [Libvirt Development]     [Libvirt Users]     [CentOS Virtualization]     [Netdev]     [Ethernet Bridging]     [Linux Wireless]     [Kernel Newbies]     [Security]     [Linux for Hams]     [Netfilter]     [Bugtraq]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Linux Admin]     [Samba]

  Powered by Linux