K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2018-03-23T22:36:24.980066Z
K 7
svn:log
V 401
Add a workaround to the hypervisor detection for older versions of KVM.

Originally KVM set %eax to 0 in the cpuid leaf 0x4000000 rather than
to the highest supported leaf in the hypervisor "branch".  Detect this
case and fixup the %eax value so that the hypervisor is still
detected.

Reported by:	jpaetzel
Reviewed by:	kib
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D14810

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