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Hello folks,
The os-acc spec [1] has been updated substantially. Please review the 
new version is https://review.openstack.org/#/c/577438/ .

The background for the update is that several important aspects were 
raised as comments on the previous spec ([1], [2]). An alternative 
workflow for attaching accelerators to instances was proposed [3], to 
which I responded with [4] and [5]. Finally, with another IRC discussion 
[6], it was concluded that the design/flow in [4], [5] fits the bill. 
The new version of the os-acc spec incorporates that discussion.

The main points that were raised and addressed are these:

* Some architectures like Power treat devices differently. The os-acc 
framework must provide for plugins to handle such variation. Done.

* The os-acc framework should be more closely patterned after the os-vif 
framework and Neutron flow. This is a bit debatable since Neutron ports 
and Cyborg accelerators differ in some key respects, though the os-acc 
library can be structured like os-vif. I have attempted to compare and 
contrast the os-vif and os-acc approaches.

This discussion is important because we may have programmable NICs based 
on FPGAs. Then Cyborg, Neutron and Nova are going to get tangled in a 
triangle. (If you throw Glance in for FPGA images, that leads quickly to 
a quadrilateral. Add Cinder for storage-related FPGA devices, and we get 
pulled into a pentagram. Geometry is scary. Just saying. ;-} )

* Not enough detail in [1]. Mea culpa. Hopefully fixed now.

[1] https://review.openstack.org/#/c/566798/

[2] 
http://eavesdrop.openstack.org/irclogs/%23openstack-nova/%23openstack-nova.2018-06-14.log.html#t2018-06-14T18:38:28 


[3] 
https://review.openstack.org/#/c/575545/1/specs/rocky/approved/nova-cyborg-flow.rst 


[4] https://etherpad.openstack.org/p/os-acc-discussion

[5] 
https://docs.google.com/drawings/d/1gbfimiyA1f5sTeobN9mpavEkHT7Z_ScNUqimOkdIYGA/edit 


[6] 
http://eavesdrop.openstack.org/irclogs/%23openstack-nova/%23openstack-nova.2018-06-18.log.html#t2018-06-18T22:07:02 


Regards,
Sundar

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