From dd0c1095a142263b31eafad5cc3b7d852c465484 Mon Sep 17 00:00:00 2001
From: Justinien Bouron <justinien.bouron@epfl.ch>
Date: Sun, 10 Mar 2019 05:16:22 -0700
Subject: [PATCH] Fix issue where Application Processors would sometimes use
 the physical address of LAPIC registers without translating it to virtual
 ones first.

That would happen if VM had changed the page tables before the APs
configured their LAPIC.
---
 minix/kernel/arch/i386/memory.c | 2 --
 minix/kernel/main.c             | 3 +++
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/minix/kernel/arch/i386/memory.c b/minix/kernel/arch/i386/memory.c
index 8450aa344..f70f7d98f 100644
--- a/minix/kernel/arch/i386/memory.c
+++ b/minix/kernel/arch/i386/memory.c
@@ -964,8 +964,6 @@ int arch_enable_paging(struct proc * caller)
 	}
 #if CONFIG_SMP
 	barrier();
-
-	wait_for_APs_to_finish_booting();
 #endif
 #endif
 
diff --git a/minix/kernel/main.c b/minix/kernel/main.c
index 1f5f3e51f..50b053810 100644
--- a/minix/kernel/main.c
+++ b/minix/kernel/main.c
@@ -104,6 +104,9 @@ void bsp_finish_booting(void)
 
   /* Kernel may no longer use bits of memory as VM will be running soon */
   kernel_may_alloc = 0;
+#ifdef CONFIG_SMP
+  wait_for_APs_to_finish_booting();
+#endif
 
   switch_to_user();
   NOT_REACHABLE;