app-emulation/qemu-kvm has the spice USE masked because the depends aren't met. Normally I would wait to bump until I get confirmation that these depends would work on an arch but the bump is for a security fix. spice -> app-emulation/spice Please confirm or deny these depends work and keyword them as such on your platform. They you can remove the USE mask from profiles/arch/x86/package.use.mask
As far as I could test it: Works. ~x86 added.