x86: Introduce hypervisor_cpuid_base()
This patch introduce hypervisor_cpuid_base() which loop test the hypervisor existence function until the signature match and check the number of leaves if required. This could be used by Xen/KVM guest to detect the existence of hypervisor. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: NJason Wang <jasowang@redhat.com> Link: http://lkml.kernel.org/r/1374742475-2485-1-git-send-email-jasowang@redhat.comSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>
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