diff --git a/src/cpu/x86/mtrr/earlymtrr.c b/src/cpu/x86/mtrr/earlymtrr.c
index 4d14a8de08..e4003591f9 100644
--- a/src/cpu/x86/mtrr/earlymtrr.c
+++ b/src/cpu/x86/mtrr/earlymtrr.c
@@ -42,3 +42,17 @@ void set_var_mtrr(
 	maskm.hi = (1 << (cpu_phys_address_size() - 32)) - 1;
 	wrmsr(MTRR_PHYS_MASK(reg), maskm);
 }
+
+void clear_all_var_mtrr(void)
+{
+	msr_t mtrr = {0, 0};
+	int vcnt;
+	int i;
+
+	vcnt = get_var_mtrr_count();
+
+	for (i = 0; i < vcnt; i++) {
+		wrmsr(MTRR_PHYS_MASK(i), mtrr);
+		wrmsr(MTRR_PHYS_BASE(i), mtrr);
+	}
+}
diff --git a/src/include/cpu/x86/mtrr.h b/src/include/cpu/x86/mtrr.h
index 07db3cb606..50148ffd35 100644
--- a/src/include/cpu/x86/mtrr.h
+++ b/src/include/cpu/x86/mtrr.h
@@ -107,6 +107,7 @@ static inline int get_var_mtrr_count(void)
 void set_var_mtrr(unsigned int reg, unsigned int base, unsigned int size,
 	unsigned int type);
 int get_free_var_mtrr(void);
+void clear_all_var_mtrr(void);
 
 asmlinkage void display_mtrrs(void);