Like I said the last time this was asked about: I am fine either way, but whatever package takes up these firmware files must be prepared to make releases *to stable and backports* relatively often, and deal with regressions.
And it is easier to deal with regression issues on firmware when they're split to their own packages, really. Since SEV firmware is "loaded late" (unlike cpu microcode), it will work just fine wherever it is packaged. So, it really is just an issue of how annoying it will be to deal with updates and reverting it should it cause regressions. I personally feel it makes sense to group it with the processor firmware, though. Meanwhile, if there is an important SEV update pending, please file a bug requesting an update on amd64-microcode. -- Henrique de Moraes Holschuh <h...@debian.org>