From 525c939b16cf03fdbe19b53878649d869b71bee2 Mon Sep 17 00:00:00 2001
From: Jan Beulich <jbeulich@suse.com>
Date: Fri, 17 Aug 2012 11:36:08 +0200
Subject: [PATCH] x86/ucode: don't crash during AP bringup on non-Intel,
 non-AMD CPUs

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
---
 xen/arch/x86/microcode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/microcode.c b/xen/arch/x86/microcode.c
index bdda3f5f4d..fe51034426 100644
--- a/xen/arch/x86/microcode.c
+++ b/xen/arch/x86/microcode.c
@@ -109,6 +109,9 @@ int microcode_resume_cpu(int cpu)
     struct cpu_signature nsig;
     unsigned int cpu2;
 
+    if ( !microcode_ops )
+        return 0;
+
     spin_lock(&microcode_mutex);
 
     err = microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);
-- 
2.30.2