Intel Security Bug "Downfall" AVX2/AVX512

Hi, had somebody updated his CPU-Microcode für the affected Intel CPU´s (6th-11th CPU generation in general) because of the Downfall-security-bug?
The updated Microcode could decrease the speed for operations with AVX2/AVX512, which are very important für hpc-scientific calculation.
Are there some benchmarks?
Kindly regards, Markus