KVM: x86: Squash CPUID 0x2.0 insanity for modern CPUs

Rework CPUID 0x2.0 to be a normal CPUID leaf if it returns "01" in AL,
i.e. EAX & 0xff, as a step towards removing KVM's stateful CPUID code
altogether.

Long ago, Intel documented CPUID 0x2.0 as being a stateful leaf, e.g. a
version of the SDM circa 1995 states:

  The least-significant byte in register EAX (register AL) indicates the
  number of times the CPUID instruction must be executed with an input
  value of 2 to get a complete description of the processors's caches
  and TLBs.  The Pentium Pro family of processors will return a 1.

A 2000 version of the SDM only updated the paragraph to reference
Intel's new processory family:

  The first member of the family of Pentium 4 processors will return a 1.

Fast forward to the present, and Intel's SDM now states:

  The least-significant byte in register EAX (register AL) will always
  return 01H.  Software should ignore this value and not interpret it as
  an information descriptor.

AMD's APM simply states that CPUID 0x2 is reserved.

Given that CPUID itself was introduced in the Pentium, odds are good
that the only Intel CPU family that *maybe* implemented a stateful CPUID
was the P5.  Which obviously did not support VMX, or KVM.

In other words, KVM's emulation of a stateful CPUID 0x2.0 has likely
been dead code from the day it was introduced.  This is backed up by
commit 0fdf8e59 ("KVM: Fix cpuid iteration on multiple leaves per
eac"), which shows that the stateful iteration code was completely
broken when it was introduced by commit 07716717

 ("KVM: Enhance
guest cpuid management"), i.e. not actually tested.

Annotate all stateful code paths as "unlikely", but defer its removal to
a future patch to simplify reinstating the code if by some miracle there
is someone running KVM on a CPU with a stateful CPUID 0x2.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>