Andi Kleen wrote:
quoted text
>> I think what Erik is trying to do is to make it possible to disable as
>> many of these in the kernel as possible; I/O is easy, it's off by
>> default; RDTSC and RDPMC can be disabled in the kernel, and I think
>> even XSTORE can be disabled.
> 
> I'm a little sceptical it will work reliably, but we'll see.
> 
> There's also LSL (forgot that earlier). It is used by the vgetcpu()
> because it's faster than CPUID or RDTSCP. Kernel
> sets a magic segment up which has different limits for different CPUs.
> 

Yeah, that's unlikely to be found in code that isn't actively looking 
for it, though.

	-hpa
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