linux-kernel - [PATCH v4 00/14] vdpa: add vdpa simulator for block device

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Message-Id: <20210315163450.254396-1-sgarzare@redhat.com>
Date:   Mon, 15 Mar 2021 17:34:36 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     netdev@...r.kernel.org, Xie Yongji <xieyongji@...edance.com>,
        Laurent Vivier <lvivier@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, Max Gurtovoy <mgurtovoy@...dia.com>,
        Jason Wang <jasowang@...hat.com>,
        Parav Pandit <parav@...dia.com>,
        "Michael S. Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org
Subject: [PATCH v4 00/14] vdpa: add vdpa simulator for block device

v4:
- added support for iproute2 vdpa management tool in vdpa_sim_blk
- removed get/set_config patches
  - 'vdpa: add return value to get_config/set_config callbacks'
  - 'vhost/vdpa: remove vhost_vdpa_config_validate()'
- added get_config_size() patches
  - 'vdpa: add get_config_size callback in vdpa_config_ops'
  - 'vhost/vdpa: use get_config_size callback in vhost_vdpa_config_validate()'

v3: https://lore.kernel.org/lkml/20210204172230.85853-1-sgarzare@redhat.com/
v2: https://lore.kernel.org/lkml/20210128144127.113245-1-sgarzare@redhat.com/
v1: https://lore.kernel.org/lkml/93f207c0-61e6-3696-f218-e7d7ea9a7c93@redhat.com/

This series is the second part of the v1 linked above. The first part with
refactoring of vdpa_sim has already been merged.

The patches are based on Max Gurtovoy's work and extend the block simulator to
have a ramdisk behaviour.

As mentioned in the v1 there was 2 issues and I fixed them in this series:
1. The identical mapping in the IOMMU used until now in vdpa_sim created issues
   when mapping different virtual pages with the same physical address.
   Fixed by patch "vdpa_sim: use iova module to allocate IOVA addresses"

2. There was a race accessing the IOMMU between the vdpasim_blk_work() and the
   device driver that map/unmap DMA regions. Fixed by patch "vringh: add
   'iotlb_lock' to synchronize iotlb accesses"

I used the Xie's patch coming from VDUSE series to allow vhost-vdpa to use
block devices, and I added get_config_size() callback to allow any device
in vhost-vdpa.

The series also includes small fixes for vringh, vdpa, and vdpa_sim that I
discovered while implementing and testing the block simulator.

Thanks for your feedback,
Stefano

Max Gurtovoy (1):
  vdpa: add vdpa simulator for block device

Stefano Garzarella (12):
  vdpa_sim: use iova module to allocate IOVA addresses
  vringh: add 'iotlb_lock' to synchronize iotlb accesses
  vringh: reset kiov 'consumed' field in __vringh_iov()
  vringh: explain more about cleaning riov and wiov
  vringh: implement vringh_kiov_advance()
  vringh: add vringh_kiov_length() helper
  vdpa_sim: cleanup kiovs in vdpasim_free()
  vdpa: add get_config_size callback in vdpa_config_ops
  vhost/vdpa: use get_config_size callback in
    vhost_vdpa_config_validate()
  vdpa_sim_blk: implement ramdisk behaviour
  vdpa_sim_blk: handle VIRTIO_BLK_T_GET_ID
  vdpa_sim_blk: add support for vdpa management tool

Xie Yongji (1):
  vhost/vdpa: Remove the restriction that only supports virtio-net
    devices

 drivers/vdpa/vdpa_sim/vdpa_sim.h     |   2 +
 include/linux/vdpa.h                 |   4 +
 include/linux/vringh.h               |  19 +-
 drivers/vdpa/ifcvf/ifcvf_main.c      |   6 +
 drivers/vdpa/mlx5/net/mlx5_vnet.c    |   6 +
 drivers/vdpa/vdpa_sim/vdpa_sim.c     | 127 ++++++----
 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 338 +++++++++++++++++++++++++++
 drivers/vdpa/virtio_pci/vp_vdpa.c    |   8 +
 drivers/vhost/vdpa.c                 |  15 +-
 drivers/vhost/vringh.c               |  69 ++++--
 drivers/vdpa/Kconfig                 |   8 +
 drivers/vdpa/vdpa_sim/Makefile       |   1 +
 12 files changed, 529 insertions(+), 74 deletions(-)
 create mode 100644 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c

-- 
2.30.2