Hi Anatoly,

On 13/1/2021 11:08 AM, Burakov, Anatoly wrote:

On 08-Jan-21 2:30 PM, David Hunt wrote:

quoted

The power example applications that uses the virtio-serial method of
communication cannot currently be built with make, and can only be built
using meson/ninja.

The guest channel message definitions and functions in guest_channel.h
are needed by applications and need to be made public.

This worked pre-20.11, but now with all the meson/ninja changes, making
these apps externally no longer works. To fix, we need to move the 
header
file with the API definitions for the channel commands public, and 
rename
the functions accordingly.

The main change is to rename channel_commands.h to
rte_power_guest_channel.h so that it gets picked up by the installer and
copied to /usr/local/include. Other changes include renaming #defines to
have RTE_ at the beginning instead of CPU_. Finally we refactor the code
to work with those changes.

---
v2 changes
   - re-worked from monolithic patch to a 6 patch patchset for easier 
review

[PATCH v2 1/6] power: create guest channel public header file
[PATCH v2 2/6] power: make channel msg functions public
[PATCH v2 3/6] power: rename public structs
[PATCH v2 4/6] power: rename defines
[PATCH v2 5/6] power: add new header file to export list
[PATCH v2 6/6] power: clean up includes

Just a general question: wouldn't it be better to move this stuff 
entirely into sample app and not bother with keeping it in the 
library? There is precedent - ethtool app has a "library" and an 
"application" part, i think you should be able to move it out of the 
library and into the sample app entirely without too much trouble, as 
code looks to be fairly self-contained.

Agreed, that's a great idea. I could have a common lib under 
examples/vm_power_manager, then two apps, vm_power_manager and 
guest_cli. That would keep everything nicely local, and not expose the 
channel API publicly. The only reason we were making it public was to 
allow "make" to work, so that's not a good enought reason, tbh. I'll 
throw a prototype together today.

Thanks,
Dave.