Rework virtual machine hypervisor detection.

- Move the existing code to x86/x86/identcpu.c since it is x86-specific.
- If the CPUID2_HV flag is set, assume a hypervisor is present and query
  the 0x40000000 leaf to determine the hypervisor vendor ID.  Export the
  vendor ID and the highest supported hypervisor CPUID leaf via
  hv_vendor[] and hv_high variables, respectively.  The hv_vendor[]
  array is also exported via the hw.hv_vendor sysctl.
- Merge the VMWare detection code from tsc.c into the new probe in
  identcpu.c.  Add a VM_GUEST_VMWARE to identify vmware and use that in
  the TSC code to identify VMWare.

Differential Revision:	https://reviews.freebsd.org/D1010
Reviewed by:	delphij, jkim, neel

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/amd64/include/md_var.h b/sys/amd64/include/md_var.h
index e5e78f65369e..96da886af9ff 100644
--- a/sys/amd64/include/md_var.h
+++ b/sys/amd64/include/md_var.h
@@ -62,6 +62,8 @@ extern	u_int	cpu_mon_mwait_flags;
 extern	u_int	cpu_mon_min_size;
 extern	u_int	cpu_mon_max_size;
 extern	char	ctx_switch_xsave[];
+extern	u_int	hv_high;
+extern	char	hv_vendor[];
 extern	char	kstack[];
 extern	char	sigcode[];
 extern	int	szsigcode;