Change in ...coreboot[master]: cpu/intel/common: improve VMX/lock bit debug output

[Matt DeVillier (Code Review)]

Matt DeVillier has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/30524

Change subject: cpu/intel/common: improve VMX/lock bit debug output
......................................................................

cpu/intel/common: improve VMX/lock bit debug output

Currently, if the IA32_FEATURE_CONTROL lock bit is already
set, VMX status isn't reported. Adjust debug output to
provide more useful infomation on both VMX and lock bit statuses.

Test: build/boot google/chell, observe useful output in cbmem log
regardless of lock bit status.

Change-Id: Ie50f214f7e3fcfd6c3d0d2de034a93518c0a6b46
Signed-off-by: Matt DeVillier 
---
M src/cpu/intel/common/common_init.c
1 file changed, 16 insertions(+), 22 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/24/30524/1

diff --git a/src/cpu/intel/common/common_init.c b/src/cpu/intel/common/common_init.c
index 9c0fcbb..486e412 100644
--- a/src/cpu/intel/common/common_init.c
+++ b/src/cpu/intel/common/common_init.c
@@ -43,27 +43,26 @@
    msr = rdmsr(IA32_FEATURE_CONTROL);

if (msr.lo & (1 << 0)) {
-		printk(BIOS_ERR, "IA32_FEATURE_CONTROL is locked, so %s will do nothing\n",
-			__func__);
+		printk(BIOS_DEBUG, "IA32_FEATURE_CONTROL already locked; ");
    	/* IA32_FEATURE_CONTROL locked. If we set it again we get an
    	 * illegal instruction
    	 */
-		return;
+	} else {
+
+		/* IA32_FEATURE_CONTROL MSR may initialize with random values.
+		 * It must be cleared regardless of VMX config setting.
+		 */
+		msr.hi = msr.lo = 0;
+
+		if (enable) {
+			msr.lo |= (1 << 2);
+			if (feature_flag & CPUID_SMX)
+				msr.lo |= (1 << 1);
+		}
+
+		wrmsr(IA32_FEATURE_CONTROL, msr);
    }

-	/* The IA32_FEATURE_CONTROL MSR may initialize with random values.
-	 * It must be cleared regardless of VMX config setting.
-	 */
-	msr.hi = msr.lo = 0;
-
-	if (enable) {
-		msr.lo |= (1 << 2);
-		if (feature_flag & CPUID_SMX)
-			msr.lo |= (1 << 1);
-	}
-
-	wrmsr(IA32_FEATURE_CONTROL, msr);
-
    printk(BIOS_DEBUG, "VMX status: %s\n",
    	enable ? "enabled" : "disabled");
 }
@@ -75,15 +74,10 @@
    msr = rdmsr(IA32_FEATURE_CONTROL);

if (msr.lo & (1 << 0)) {
-		printk(BIOS_ERR, "IA32_FEATURE_CONTROL is locked, so %s will do nothing\n",
-			__func__);
    	/* IA32_FEATURE_CONTROL locked. If we set it again we get an
    	 * illegal instruction
    	 */
-		return;
-	}
-
-	if (lock) {
+	} else if (lock) {
    	/* Set lock bit */
    	msr.lo |= (1 << 0);
    	wrmsr(IA32_FEATURE_CONTROL, msr);