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, 3 insertions, 43 deletions

diff --git a/src/cpu/intel/haswell/haswell_init.c b/src/cpu/intel/haswell/haswell_init.c
index 2fac8791d3..0b243ade9a 100644
--- a/src/cpu/intel/haswell/haswell_init.c
+++ b/src/cpu/intel/haswell/haswell_init.c
@@ -34,6 +34,7 @@
 #include <pc80/mc146818rtc.h>
 #include <northbridge/intel/haswell/haswell.h>
 #include <southbridge/intel/lynxpoint/pch.h>
+#include <cpu/intel/common/common.h>
 #include "haswell.h"
 #include "chip.h"
 
@@ -145,47 +146,6 @@ static acpi_cstate_t cstate_map[NUM_C_STATES] = {
 	},
 };
 
-static void enable_vmx(void)
-{
-	struct cpuid_result regs;
-	msr_t msr;
-	int enable = IS_ENABLED(CONFIG_ENABLE_VMX);
-
-	regs = cpuid(1);
-	/* Check that the VMX is supported before reading or writing the MSR. */
-	if (!((regs.ecx & CPUID_VMX) || (regs.ecx & CPUID_SMX)))
-		return;
-
-	msr = rdmsr(IA32_FEATURE_CONTROL);
-
-	if (msr.lo & (1 << 0)) {
-		printk(BIOS_ERR, "VMX is locked, so %s will do nothing\n", __func__);
-		/* VMX locked. If we set it again we get an illegal
-		 * instruction
-		 */
-		return;
-	}
-
-	/* The IA32_FEATURE_CONTROL MSR may initialize with random values.
-	 * It must be cleared regardless of VMX config setting.
-	 */
-	msr.hi = msr.lo = 0;
-
-	printk(BIOS_DEBUG, "%s VMX\n", enable ? "Enabling" : "Disabling");
-
-	if (enable) {
-		msr.lo |= (1 << 2);
-		if (regs.ecx & CPUID_SMX)
-			msr.lo |= (1 << 1);
-	}
-
-	wrmsr(IA32_FEATURE_CONTROL, msr);
-
-	msr.lo |= (1 << 0); /* Set lock bit */
-
-	wrmsr(IA32_FEATURE_CONTROL, msr);
-}
-
 /* Convert time in seconds to POWER_LIMIT_1_TIME MSR value */
 static const u8 power_limit_time_sec_to_msr[] = {
 	[0]   = 0x00,
@@ -724,8 +684,8 @@ static void haswell_init(struct device *cpu)
 	enable_lapic_tpr();
 	setup_lapic();
 
-	/* Enable virtualization if Kconfig option is set */
-	enable_vmx();
+	/* Set virtualization based on Kconfig option */
+	set_vmx();
 
 	/* Configure C States */
 	configure_c_states();