x86/microcode: Serialize cpu startup during early updates

zhaoxin inclusion
category: feature

--------------------

Due to hardware limitations, it is necessary to avoid situations where
some cores are waiting to receive startup while other cores are updating
microcode. Therefore, cpu startup must be serialized when microcode
updates are required.

Reviewed-by: Tony W. Wang <tonywwang@zhaoxin.com>
Signed-off-by: Lyle Li <lyleli@zhaoxin.com>
Signed-off-by: LeoLiu-oc <leoliu-oc@zhaoxin.com>

Author: leoliu-oc

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

@@ -490,6 +490,7 @@ void __init load_ucode_zhaoxin_bsp(struct early_load_data *ed)
 
 	if (uci.mc && apply_microcode_early(&uci) == UCODE_UPDATED) {
 		zhaoxin_ucode_patch = UCODE_BSP_LOADED;
+		x86_cpuinit.parallel_bringup = false;
 		ed->new_rev = uci.cpu_sig.rev;
 	} else if (uci.mc) {
 		pr_debug("%s: BSP CPU %d early update failed due to application failure\n",