Branden Bonaby [off-list ref] writes:

This patchset introduces a testing framework for Hyper-V drivers.
This framework allows us to introduce delays in the packet receive
path on a per-device basis. While the current code only supports 
introducing arbitrary delays in the host/guest communication path,
we intend to expand this to support error injection in the future.

Branden Bonaby (3):
  drivers: hv: vmbus: Introduce latency testing
  drivers: hv: vmbus: add fuzz test attributes to sysfs
  tools: hv: add vmbus testing tool

 Documentation/ABI/stable/sysfs-bus-vmbus |  22 ++
 drivers/hv/connection.c                  |   5 +
 drivers/hv/ring_buffer.c                 |  10 +
 drivers/hv/vmbus_drv.c                   |  97 ++++++-

Can we have something like CONFIG_HYPERV_TESTING and put this new 
code under #ifdef?

 include/linux/hyperv.h                   |  14 +
 tools/hv/vmbus_testing                   | 326 +++++++++++++++++++++++
 6 files changed, 473 insertions(+), 1 deletion(-)
 create mode 100644 tools/hv/vmbus_testing

-- 
Vitaly