feat: added function for checking MSR's flags

docs/re.md

@@ -135,6 +135,26 @@ able to write to this MSR using __wrmsr. What's interesting about this is that
 the tutorial tries to modify this MSR but if we assume that the **lock bit is set**
 that branch **will be a no-op**.
 
+```c
+static bool ia32_feature_control_flags(void) {
+    int msr_value = __rdmsr(IA32_FEATURE_CONTROL_MSR);
+
+    if (!(msr_value & IA32_FEATURE_CONTROL_LOCK_BIT)) {
+        printk(KERN_INFO "Writing to the IA32_FEATURE_CONTROL MSR\n");
+        __wrmsr(IA32_FEATURE_CONTROL_MSR,
+                IA32_FEATURE_CONTROL_LOCK_BIT |
+                    IA32_FEATURE_CONTROL_VMXON_OUTSIDE_SMX,
+                0);
+    }
+
+    if (!(msr_value & IA32_FEATURE_CONTROL_VMXON_OUTSIDE_SMX)) {
+        printk(KERN_INFO "Virtualization isn't available\n");
+        return false;
+    }
+
+    return true;
+}
+```
 
 ## References