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-rw-r--r--src/soc/intel/skylake/Kconfig1
-rw-r--r--src/soc/intel/skylake/cpu.c22
2 files changed, 23 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/Kconfig b/src/soc/intel/skylake/Kconfig
index 901e5f9b21..8bdd9b56d9 100644
--- a/src/soc/intel/skylake/Kconfig
+++ b/src/soc/intel/skylake/Kconfig
@@ -31,6 +31,7 @@ config CPU_SPECIFIC_OPTIONS
select COMMON_FADT
select CPU_INTEL_COMMON
select CPU_INTEL_FIRMWARE_INTERFACE_TABLE
+ select CPU_INTEL_COMMON_HYPERTHREADING
select C_ENVIRONMENT_BOOTBLOCK
select FSP_M_XIP if MAINBOARD_USES_FSP2_0
select FSP_T_XIP if FSP_CAR
diff --git a/src/soc/intel/skylake/cpu.c b/src/soc/intel/skylake/cpu.c
index 1f9ecada74..63142b9b3f 100644
--- a/src/soc/intel/skylake/cpu.c
+++ b/src/soc/intel/skylake/cpu.c
@@ -420,6 +420,25 @@ static void enable_pm_timer_emulation(void)
wrmsr(MSR_EMULATE_PM_TIMER, msr);
}
+/*
+ * Lock AES-NI (MSR_FEATURE_CONFIG) to prevent unintended disabling
+ * as suggested in Intel document 325384-070US.
+ */
+static void cpu_lock_aesni(void)
+{
+ msr_t msr;
+
+ /* Only run once per core as specified in the MSR datasheet */
+ if (intel_ht_sibling())
+ return;
+
+ msr = rdmsr(MSR_FEATURE_CONFIG);
+ if ((msr.lo & 1) == 0) {
+ msr.lo |= 1;
+ wrmsr(MSR_FEATURE_CONFIG, msr);
+ }
+}
+
/* All CPUs including BSP will run the following function. */
void soc_core_init(struct device *cpu)
{
@@ -444,6 +463,9 @@ void soc_core_init(struct device *cpu)
/* Configure Intel Speed Shift */
configure_isst();
+ /* Lock AES-NI MSR */
+ cpu_lock_aesni();
+
/* Enable ACPI Timer Emulation via MSR 0x121 */
enable_pm_timer_emulation();