From: Roger Pau Monne <roger.pau@citrix.com>
Date: Wed, 17 Jan 2018 08:34:19 +0000 (+0000)
Subject: xen/pvshim: map vcpu_info earlier for APs
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~752
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=aeb318351a77c8556025fced110ce387e4dfb93e;p=xen.git

xen/pvshim: map vcpu_info earlier for APs

Or else init_percpu_time is going to dereference a NULL pointer when
trying to access vcpu_info.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
index 63ca053b35..2cdd431b5f 100644
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -349,6 +349,9 @@ void start_secondary(void *unused)
     else
         microcode_resume_cpu(cpu);
 
+    if ( xen_guest )
+        hypervisor_ap_setup();
+
     smp_callin();
 
     init_percpu_time();
@@ -376,9 +379,6 @@ void start_secondary(void *unused)
     cpumask_set_cpu(cpu, &cpu_online_map);
     unlock_vector_lock();
 
-    if ( xen_guest )
-        hypervisor_ap_setup();
-
     /* We can take interrupts now: we're officially "up". */
     local_irq_enable();
     mtrr_ap_init();