The current ovmf srcrev is some point before edk2-stable201808. That's old and there are several good reasons to upgrade: 1) new openssl with less security issues 2) ability to build with Python 3 Regarding (2) any tag from edk2-stable201903 onwards can be built with Python 3.
There's a *very rough* work in progress upgrade in poky-contrib:ross/nopy2.
Completed recipe updates. Now testing OVMF with and without secure boot.
Completed testing. Getting ready for review.
Patches submitted here: http://lists.openembedded.org/pipermail/openembedded-core/2019-August/285473.html
Patches have been merged into the master branch of openembedded-core: https://git.openembedded.org/openembedded-core/commit/?id=5e47316ae62f7632fb62bc3b8093ac42f9e3541c