[Xen-devel] [PATCH v3 1/7] xen/pvshim: map vcpu_info earlier for APs

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

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@xxxxxxxxxx>
Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Should be backported to the 4.10.0-shim-comet branch.
---
 xen/arch/x86/smpboot.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

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();
-- 
2.15.1


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