linux-kernel - [PATCH RFC v2 00/10] vdpa: add vdpa simulator for block device

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Message-Id: <20210128144127.113245-1-sgarzare@redhat.com>
Date:   Thu, 28 Jan 2021 15:41:17 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     Xie Yongji <xieyongji@...edance.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.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>, kvm@...r.kernel.org
Subject: [PATCH RFC v2 00/10] vdpa: add vdpa simulator for block device

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"

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

-- 
2.29.2