[PATCH v4 0/2] vdpasim: support doorbell mapping

["Longpeng(Mike)" <longpeng2@huawei.com>]

From: Longpeng <longpeng2@huawei.com>

This patchset supports doorbell mapping for vdpasim devices.

v3: https://lore.kernel.org/lkml/20230213070446-mutt-send-email-mst@kernel.org/T/
v2: https://lore.kernel.org/lkml/CACGkMEtdT5fG=ffbpQadkGmzHf6Ax-+L50LsriYqJaW++natMg@mail.gmail.com/T/

Changes v3->v4:
    - use WRITE_ONCE  [Jason]
    - start/stop periodic work when create/destroy vdpasim device  [Jason]

Changes v2->v3:
    - add a new callback named get_vq_notification_pgprot to vdpa_config_ops [Jason]
    - remove the new added module parameter 'parameter' [Jason]
    - opencode the schedule/cancel_delayed() [Jason]

Changes v1->v2:
    - support both kick mode and passthrough mode. [Jason]
    - poll the notify register first. [Jason, Michael]

Longpeng (2):
  vdpa: support specify the pgprot of vq notification area
  vdpasim: support doorbell mapping

 drivers/vdpa/vdpa_sim/vdpa_sim.c | 67 ++++++++++++++++++++++++++++++++
 drivers/vdpa/vdpa_sim/vdpa_sim.h |  3 ++
 drivers/vhost/vdpa.c             |  4 +-
 include/linux/vdpa.h             |  9 +++++
 4 files changed, 82 insertions(+), 1 deletion(-)

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2.23.0