Andi Kleen wrote:
>>
>> No processors that support KVM exist that also do not support CMPXCHG64,
>> so no additional check is necessary. This setup allows for a single kernel
>> that will boot on i486 and also support KVM if available.
>
> The CONFIG should only control the early CPUID checks, which are needed for PAE
> kernels.
>
> But for something late like KVM the correct fix is really to drop
> the ifdefs around the macro and check boot_cpu_has() yourself.
>
He's checking for the appropriate functionality at runtime. What this
does is makes it impossible to select KVM when you have already selected
a CPU that doesn't support CX8.
One can, of course, question the utility, since the CPU set that
supports KVM all support CX8, but not vice versa...
-hpa
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