3 files changed, 66 insertions, 14 deletions

diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 7af0f88a416..84e83de5457 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -58,6 +58,7 @@ unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
 static DEFINE_MUTEX(mtrr_mutex);
 
 u64 size_or_mask, size_and_mask;
+static bool mtrr_aps_delayed_init;
 
 static struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM];
 
@@ -163,7 +164,10 @@ static void ipi_handler(void *info)
 	if (data->smp_reg != ~0U) {
 		mtrr_if->set(data->smp_reg, data->smp_base,
 			     data->smp_size, data->smp_type);
-	} else {
+	} else if (mtrr_aps_delayed_init) {
+		/*
+		 * Initialize the MTRRs inaddition to the synchronisation.
+		 */
 		mtrr_if->set_all();
 	}
 
@@ -265,6 +269,8 @@ set_mtrr(unsigned int reg, unsigned long base, unsigned long size, mtrr_type typ
 	 */
 	if (reg != ~0U)
 		mtrr_if->set(reg, base, size, type);
+	else if (!mtrr_aps_delayed_init)
+		mtrr_if->set_all();
 
 	/* Wait for the others */
 	while (atomic_read(&data.count))
@@ -721,9 +727,7 @@ void __init mtrr_bp_init(void)
 
 void mtrr_ap_init(void)
 {
-	unsigned long flags;
-
-	if (!mtrr_if || !use_intel())
+	if (!use_intel() || mtrr_aps_delayed_init)
 		return;
 	/*
 	 * Ideally we should hold mtrr_mutex here to avoid mtrr entries
@@ -738,11 +742,7 @@ void mtrr_ap_init(void)
 	 *   2. cpu hotadd time. We let mtrr_add/del_page hold cpuhotplug
 	 *      lock to prevent mtrr entry changes
 	 */
-	local_irq_save(flags);
-
-	mtrr_if->set_all();
-
-	local_irq_restore(flags);
+	set_mtrr(~0U, 0, 0, 0);
 }
 
 /**
@@ -753,6 +753,34 @@ void mtrr_save_state(void)
 	smp_call_function_single(0, mtrr_save_fixed_ranges, NULL, 1);
 }
 
+void set_mtrr_aps_delayed_init(void)
+{
+	if (!use_intel())
+		return;
+
+	mtrr_aps_delayed_init = true;
+}
+
+/*
+ * MTRR initialization for all AP's
+ */
+void mtrr_aps_init(void)
+{
+	if (!use_intel())
+		return;
+
+	set_mtrr(~0U, 0, 0, 0);
+	mtrr_aps_delayed_init = false;
+}
+
+void mtrr_bp_restore(void)
+{
+	if (!use_intel())
+		return;
+
+	mtrr_if->set_all();
+}
+
 static int __init mtrr_init_finialize(void)
 {
 	if (!mtrr_if)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 61f86f24142..19f15c4076f 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -712,6 +712,21 @@ void __init setup_arch(char **cmdline_p)
 	printk(KERN_INFO "Command line: %s\n", boot_command_line);
 #endif
 
+	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
+	*cmdline_p = command_line;
+
+#ifdef CONFIG_X86_64
+	/*
+	 * Must call this twice: Once just to detect whether hardware doesn't
+	 * support NX (so that the early EHCI debug console setup can safely
+	 * call set_fixmap(), and then again after parsing early parameters to
+	 * honor the respective command line option.
+	 */
+	check_efer();
+#endif
+
+	parse_early_param();
+
 	/* VMI may relocate the fixmap; do this before touching ioremap area */
 	vmi_init();
 
@@ -794,11 +809,6 @@ void __init setup_arch(char **cmdline_p)
 #endif
 #endif
 
-	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
-	*cmdline_p = command_line;
-
-	parse_early_param();
-
 #ifdef CONFIG_X86_64
 	check_efer();
 #endif
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 9d8319183aa..a25eeec0008 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1118,9 +1118,22 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 
 	if (is_uv_system())
 		uv_system_init();
+
+	set_mtrr_aps_delayed_init();
 out:
 	preempt_enable();
 }
+
+void arch_enable_nonboot_cpus_begin(void)
+{
+	set_mtrr_aps_delayed_init();
+}
+
+void arch_enable_nonboot_cpus_end(void)
+{
+	mtrr_aps_init();
+}
+
 /*
  * Early setup to make printk work.
  */
@@ -1142,6 +1155,7 @@ void __init native_smp_cpus_done(unsigned int max_cpus)
 	setup_ioapic_dest();
 #endif
 	check_nmi_watchdog();
+	mtrr_aps_init();
 }
 
 static int __initdata setup_possible_cpus = -1;