diff --git a/src/soc/intel/alderlake/cpu.c b/src/soc/intel/alderlake/cpu.c
index fc4ca61f2d..a6175ed796 100644
--- a/src/soc/intel/alderlake/cpu.c
+++ b/src/soc/intel/alderlake/cpu.c
@@ -38,6 +38,15 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
 }
 
+void cpu_soc_bios_done(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_BIOS_DONE);
+	msr.lo |= ENABLE_IA_UNTRUSTED;
+	wrmsr(MSR_BIOS_DONE, msr);
+}
+
 static void soc_fsp_load(void)
 {
 	fsps_load();
diff --git a/src/soc/intel/apollolake/cpu.c b/src/soc/intel/apollolake/cpu.c
index 79a69f518c..ec262f7b35 100644
--- a/src/soc/intel/apollolake/cpu.c
+++ b/src/soc/intel/apollolake/cpu.c
@@ -54,6 +54,15 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
 }
 
+void cpu_soc_bios_done(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_POWER_MISC);
+	msr.lo |= ENABLE_IA_UNTRUSTED;
+	wrmsr(MSR_POWER_MISC, msr);
+}
+
 void soc_core_init(struct device *cpu)
 {
 	/* Configure Core PRMRR for SGX. */
diff --git a/src/soc/intel/cannonlake/cpu.c b/src/soc/intel/cannonlake/cpu.c
index b7ca2b4db3..7e5e4cc0ca 100644
--- a/src/soc/intel/cannonlake/cpu.c
+++ b/src/soc/intel/cannonlake/cpu.c
@@ -27,6 +27,15 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
 }
 
+void cpu_soc_bios_done(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_BIOS_DONE);
+	msr.lo |= ENABLE_IA_UNTRUSTED;
+	wrmsr(MSR_BIOS_DONE, msr);
+}
+
 static void soc_fsp_load(void)
 {
 	fsps_load();
diff --git a/src/soc/intel/common/block/include/intelblocks/cpulib.h b/src/soc/intel/common/block/include/intelblocks/cpulib.h
index b9c3ab70c3..281c9651a1 100644
--- a/src/soc/intel/common/block/include/intelblocks/cpulib.h
+++ b/src/soc/intel/common/block/include/intelblocks/cpulib.h
@@ -120,6 +120,9 @@ void cpu_set_eist(bool eist_status);
  */
 bool cpu_soc_is_in_untrusted_mode(void);
 
+/* SoC function to set the BIOS DONE MSR. */
+void cpu_soc_bios_done(void);
+
 /*
  * This function fills in the number of Cores(physical) and Threads(virtual)
  * of the CPU in the function arguments. It also returns if the number of cores
diff --git a/src/soc/intel/denverton_ns/cpu.c b/src/soc/intel/denverton_ns/cpu.c
index 93657fec02..8b5fb40e3c 100644
--- a/src/soc/intel/denverton_ns/cpu.c
+++ b/src/soc/intel/denverton_ns/cpu.c
@@ -31,6 +31,15 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
 }
 
+void cpu_soc_bios_done(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_POWER_MISC);
+	msr.lo |= ENABLE_IA_UNTRUSTED;
+	wrmsr(MSR_POWER_MISC, msr);
+}
+
 static struct smm_relocation_attrs relo_attrs;
 
 static void dnv_configure_mca(void)
diff --git a/src/soc/intel/elkhartlake/cpu.c b/src/soc/intel/elkhartlake/cpu.c
index 3e0dae191a..f4baa65fd9 100644
--- a/src/soc/intel/elkhartlake/cpu.c
+++ b/src/soc/intel/elkhartlake/cpu.c
@@ -24,6 +24,15 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
 }
 
+void cpu_soc_bios_done(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_BIOS_DONE);
+	msr.lo |= ENABLE_IA_UNTRUSTED;
+	wrmsr(MSR_BIOS_DONE, msr);
+}
+
 static void soc_fsp_load(void)
 {
 	fsps_load();
diff --git a/src/soc/intel/icelake/cpu.c b/src/soc/intel/icelake/cpu.c
index f503fcd051..37571758cb 100644
--- a/src/soc/intel/icelake/cpu.c
+++ b/src/soc/intel/icelake/cpu.c
@@ -24,6 +24,15 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
 }
 
+void cpu_soc_bios_done(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_BIOS_DONE);
+	msr.lo |= ENABLE_IA_UNTRUSTED;
+	wrmsr(MSR_BIOS_DONE, msr);
+}
+
 static void soc_fsp_load(void)
 {
 	fsps_load();
diff --git a/src/soc/intel/jasperlake/cpu.c b/src/soc/intel/jasperlake/cpu.c
index 01cd6acac7..24e5aa79f9 100644
--- a/src/soc/intel/jasperlake/cpu.c
+++ b/src/soc/intel/jasperlake/cpu.c
@@ -24,6 +24,15 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
 }
 
+void cpu_soc_bios_done(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_BIOS_DONE);
+	msr.lo |= ENABLE_IA_UNTRUSTED;
+	wrmsr(MSR_BIOS_DONE, msr);
+}
+
 static void soc_fsp_load(void)
 {
 	fsps_load();
diff --git a/src/soc/intel/skylake/cpu.c b/src/soc/intel/skylake/cpu.c
index 3439836f24..26ab2712a9 100644
--- a/src/soc/intel/skylake/cpu.c
+++ b/src/soc/intel/skylake/cpu.c
@@ -27,6 +27,10 @@
 
 bool cpu_soc_is_in_untrusted_mode(void)
 {
+	/*
+	 * TODO: Add dynamic detection to identify if skylake SoC
+	 * is in coffeelake board.
+	 */
 	if (!CONFIG(MAINBOARD_SUPPORTS_COFFEELAKE_CPU))
 		return false;
 
@@ -35,6 +39,18 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
 }
 
+void cpu_soc_bios_done(void)
+{
+	if (!CONFIG(MAINBOARD_SUPPORTS_COFFEELAKE_CPU))
+		return;
+
+	msr_t msr;
+
+	msr = rdmsr(MSR_BIOS_DONE);
+	msr.lo |= ENABLE_IA_UNTRUSTED;
+	wrmsr(MSR_BIOS_DONE, msr);
+}
+
 static void configure_misc(void)
 {
 	config_t *conf = config_of_soc();
diff --git a/src/soc/intel/tigerlake/cpu.c b/src/soc/intel/tigerlake/cpu.c
index ffccdccf44..e81a655329 100644
--- a/src/soc/intel/tigerlake/cpu.c
+++ b/src/soc/intel/tigerlake/cpu.c
@@ -30,6 +30,15 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
 }
 
+void cpu_soc_bios_done(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_BIOS_DONE);
+	msr.lo |= ENABLE_IA_UNTRUSTED;
+	wrmsr(MSR_BIOS_DONE, msr);
+}
+
 static void soc_fsp_load(void)
 {
 	fsps_load();
diff --git a/src/soc/intel/xeon_sp/cpx/cpu.c b/src/soc/intel/xeon_sp/cpx/cpu.c
index 71249cb1d8..4ecfad0f89 100644
--- a/src/soc/intel/xeon_sp/cpx/cpu.c
+++ b/src/soc/intel/xeon_sp/cpx/cpu.c
@@ -36,6 +36,11 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return false;
 }
 
+void cpu_soc_bios_done(void)
+{
+	/* IA_UNTRUSTED_MODE is not supported in Cooper Lake */
+}
+
 static void xeon_configure_mca(void)
 {
 	msr_t msr;
diff --git a/src/soc/intel/xeon_sp/skx/cpu.c b/src/soc/intel/xeon_sp/skx/cpu.c
index c29952916a..027e9bbcd3 100644
--- a/src/soc/intel/xeon_sp/skx/cpu.c
+++ b/src/soc/intel/xeon_sp/skx/cpu.c
@@ -26,6 +26,11 @@ bool cpu_soc_is_in_untrusted_mode(void)
 	return false;
 }
 
+void cpu_soc_bios_done(void)
+{
+	/* IA_UNTRUSTED_MODE is not supported in Skylake */
+}
+
 static void xeon_configure_mca(void)
 {
 	msr_t msr;