A nice test would be to compare a "cpuid -1 -r" before and after applied microcode updates. To check if new bit(s) is set somewhere. Worth might be to check if

A nice test would be to compare a "cpuid -1 -r" before and after applied microcode updates. To check if new bit(s) is set somewhere. Worth might be to check if IA32_ARCH_CAPABILITIES contain new bits set as well on some platforms which would indicate they are not affected. Via the NO_xxx flag.