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doc: add note about SRIOV disable 

Currently, Service VM may fail to shut down due to some enabled
VFs. ACRN doesn't disable VFs automatically.

In this patch, add a note for user to disable VFs before Service
VM shuts down.

Tracked-On: #5921

Signed-off-by: Xiangyang Wu <xiangyang.wu@intel.com>
This commit is contained in:
Xiangyang Wu 2021-12-13 12:59:13 +08:00 committed by David Kinder
parent 8f114d82af
commit 097afee832
1 changed files with 5 additions and 0 deletions
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doc/tutorials/enable_s5.rst
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@ -338,3 +338,8 @@ ack message, and proceeds to shut itself down accordingly.
#. After receiving the ack message from all user VMs, the Lifecycle Manager
in the Service VM shuts down VM.
#. The hypervisor shuts down the system after all VMs have shut down.
.. note:: If one or more virtual functions (VFs) of a SR-IOV device, e.g. GPU on Alder
Lake platform, are assigned to User VMs, extra steps should be taken by user to
disable all VFs before Service VM shuts down. Otherwise, Service VM may fail to
shut down due to some enabled VFs.