Revert "x86/microcode: Extend post microcode reload to support IBPB feature"

CVE-2017-5753 (revert embargoed)
CVE-2017-5715 (revert embargoed)

This reverts commit 88b00371.
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

arch/x86/kernel/cpu/microcode/core.c

@@ -430,13 +430,6 @@ static ssize_t reload_store(struct device *dev,
 		if (ibpb_inuse)
 			sysctl_ibpb_enabled = 1;
 		mutex_unlock(&spec_ctrl_mutex);
-	} else if (boot_cpu_has(X86_FEATURE_IBPB)) {
-		printk_once(KERN_INFO "FEATURE IBPB Present\n");
-		mutex_lock(&spec_ctrl_mutex);
-		set_ibpb_supported();
-		if (ibpb_inuse)
-			sysctl_ibpb_enabled = 1;
-		mutex_unlock(&spec_ctrl_mutex);
 	}
 
 	mutex_unlock(&microcode_mutex);
@@ -718,4 +711,4 @@ int __init microcode_init(void)
 	return error;
 
 }
-fs_initcall(save_microcode_in_initrd);
+late_initcall(microcode_init);