Re: [PATCH 13/13] x86/microcode/AMD: Remove AP scanning optimization

2017-01-17 Thread Thomas Gleixner
On Tue, 17 Jan 2017, Borislav Petkov wrote: > From: Borislav Petkov > > The idea was to not scan the microcode blob on each AP (Application > Processor) during boot and thus save us some milliseconds. However, on > architectures where the microcode engine is shared between threads, this > doesn'

[PATCH 13/13] x86/microcode/AMD: Remove AP scanning optimization

2017-01-17 Thread Borislav Petkov
From: Borislav Petkov The idea was to not scan the microcode blob on each AP (Application Processor) during boot and thus save us some milliseconds. However, on architectures where the microcode engine is shared between threads, this doesn't work. Here's why: The microcode on CPU0, i.e., the fir