[PATCH v9 0/5] add generic vDPA device support

[Longpeng(Mike)]

From: Longpeng <longpeng2@huawei.com>

Hi guys,

With the generic vDPA device, QEMU won't need to touch the device
types any more, such like vfio.

We can use the generic vDPA device as follow:
  -device vhost-vdpa-device-pci,vhostdev=/dev/vhost-vdpa-X
  Or
  -M microvm -m 512m -smp 2 -kernel ... -initrd ... -device \
  vhost-vdpa-device,vhostdev=/dev/vhost-vdpa-x

Changes v9 -> v8:
    - rename vhost-vdpa-device.rst to vhost-vdpa-generic-device.rst [Jason, 
Stefano]
    - emphasize the vhost-vDPA generic device in doc [Jason]

Changes v8 -> v7:
    - add migration blocker. [Michael]

Changes v6 -> v7:
    (v6: https://mail.gnu.org/archive/html/qemu-devel/2022-05/msg02821.html)
    - rebase. [Jason]
    - add documentation . [Stefan]

Changes v5 -> v6:
  Patch 2:
    - Turn to the original approach in the RFC to initialize the
      virtio_pci_id_info array. [Michael]
          https://lore.kernel.org/all/20220105005900.860-2-longpeng2@huawei.com/
  Patch 3:
    - Fix logical error of exception handler around the post_init.
      [Stefano]
    - Fix some coding style warnings. [Stefano]
  Patch 4:
    - Fix some coding style warnings. [Stefano]

Changes v4 -> v5:
  Patch 3:
    - remove vhostfd [Jason]
    - support virtio-mmio [Jason]

Changes v3 -> v4:
  v3: https://www.mail-archive.com/qemu-devel@nongnu.org/msg877015.html
  - reorganize the series [Stefano]
  - fix some typos [Stefano]
  - fix logical error in vhost_vdpa_device_realize [Stefano]

Changes v2 -> v3
  Patch 4 & 5:
    - only call vdpa ioctls in vdpa-dev.c [Stefano, Longpeng]
    - s/VQS_NUM/VQS_COUNT  [Stefano]
    - check both vdpa_dev_fd and vdpa_dev [Stefano]
  Patch 6:
    - move all steps into vhost_vdpa_device_unrealize. [Stefano]

Changes RFC -> v2
  Patch 1:
    - rename 'pdev_id' to 'trans_devid'  [Michael]
    - only use transitional device id for the devices
      listed in the spec  [Michael]
    - use macros to make the id_info table clearer  [Longpeng]
    - add some modern devices in the id_info table  [Longpeng]
  Patch 2:
    - remove the GET_VECTORS_NUM command  [Jason]
  Patch 4:
    - expose vdpa_dev_fd as a QOM preperty  [Stefan]
    - introduce vhost_vdpa_device_get_u32 as a common
      function to make the code clearer  [Stefan]
    - fix the misleading description of 'dc->desc'  [Stefano]
  Patch 5:
    - check returned number of virtqueues  [Stefan]
  Patch 6:
    - init s->num_queues  [Stefano]
    - free s->dev.vqs  [Stefano]

Longpeng (Mike) (5):
  virtio: get class_id and pci device id by the virtio id
  vdpa: add vdpa-dev support
  vdpa: add vdpa-dev-pci support
  vdpa-dev: mark the device as unmigratable
  docs: Add generic vhost-vdpa device documentation

 .../devices/vhost-vdpa-generic-device.rst     |  46 +++
 hw/virtio/Kconfig                             |   5 +
 hw/virtio/meson.build                         |   2 +
 hw/virtio/vdpa-dev-pci.c                      | 102 +++++
 hw/virtio/vdpa-dev.c                          | 377 ++++++++++++++++++
 hw/virtio/virtio-pci.c                        |  88 ++++
 include/hw/virtio/vdpa-dev.h                  |  43 ++
 include/hw/virtio/virtio-pci.h                |   5 +
 8 files changed, 668 insertions(+)
 create mode 100644 docs/system/devices/vhost-vdpa-generic-device.rst
 create mode 100644 hw/virtio/vdpa-dev-pci.c
 create mode 100644 hw/virtio/vdpa-dev.c
 create mode 100644 include/hw/virtio/vdpa-dev.h

-- 
2.23.0