On 9/21/20 3:52 PM, Pavel Machek wrote: >>> +config X86_INTEL_BRANCH_TRACKING_USER >>> + prompt "Intel Indirect Branch Tracking for user-mode" >> Take the "Intel " and "INTEL_" out, please. It will only cause us all >> pain later if some of our x86 compatriots decide to implement this. > Are other x86 manufacturers legally allowed to implement that? I don't know and frankly don't want to know. We've seen AMD and Intel both implement plenty of features from the other. Protection Keys for Userspace is the most recent example. Unless there's evidence to the contrary, I think the best thing for the kernel is to assume that any feature can show up on any vendor's CPU.
