cpu/intel/common: Add/Use common function to set virtualization

Migrate duplicated enable_vmx() method from multiple CPUs to common
folder.  Add common virtualization option for CPUs which support it.

Note that this changes the default to enable virtualization on CPUs
that support it.

Change-Id: Ib110bed6c9f5508e3f867dcdc6f341fc50e501d1
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/17874
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins)

1 files changed, 23 insertions, 0 deletions

diff --git a/src/cpu/intel/common/Kconfig b/src/cpu/intel/common/Kconfig
new file mode 100644
index 0000000000..739333e4aa
--- /dev/null
+++ b/src/cpu/intel/common/Kconfig
@@ -0,0 +1,23 @@
+config CPU_INTEL_COMMON
+	bool
+
+if CPU_INTEL_COMMON
+
+config ENABLE_VMX
+	bool "Enable VMX for virtualization"
+	default y
+
+config SET_VMX_LOCK_BIT
+	bool "Set lock bit after configuring VMX"
+	depends on ENABLE_VMX
+	default y
+	help
+	  Although the Intel manual says you must set the lock bit in addition
+	  to the VMX bit in order for VMX to work, this isn't strictly true, so
+	  we have the option to leave it unlocked and allow the OS (e.g. Linux)
+	  to manage things itself. This is beneficial for testing purposes as
+	  there is no need to reflash the firmware just to toggle the lock bit.
+	  However, leaving the lock bit unset will break Windows' detection of
+	  VMX support and built-in virtualization features like Hyper-V.
+
+endif