[RFC,v2,00/10] vdpa: add vdpa simulator for block device

Message

Stefano Garzarella Jan. 28, 2021, 2:41 p.m. UTC

v1: https://lore.kernel.org/lkml/[e-mail]/

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"

Since this series is still a RFC, I used the Xie's patch as is to allow
vhost-vdpa to use block devices, but I'll rebase when he splits it into
multiple patches.

The series also includes small fixes for vdpa_sim that I discovered while
implementing the block simulator.

Thanks for your feedback,
Stefano

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

Stefano Garzarella (8):
  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: implement vringh_kiov_advance()
  vringh: add vringh_kiov_length() helper
  vdpa_sim: cleanup kiovs in vdpasim_free()
  vdpa_sim_blk: implement ramdisk behaviour
  vdpa_sim_blk: handle VIRTIO_BLK_T_GET_ID

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

 drivers/vdpa/vdpa_sim/vdpa_sim.h     |   2 +
 include/linux/vringh.h               |  19 +-
 drivers/vdpa/vdpa_sim/vdpa_sim.c     | 118 +++++++----
 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 288 +++++++++++++++++++++++++++
 drivers/vhost/vdpa.c                 |  28 +--
 drivers/vhost/vringh.c               |  54 +++--
 drivers/vdpa/Kconfig                 |   8 +
 drivers/vdpa/vdpa_sim/Makefile       |   1 +
 8 files changed, 433 insertions(+), 85 deletions(-)
 create mode 100644 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c