[Xen-devel] [PATCH] xen/arm: Initialize PERCPU variables at the beginning of start_xen

[Julien Grall <julien.grall@xxxxxxxxxx>]

PERCPU variables rely on HTPIDR (TPIDR_EL2) which is in an unknown state when
a processor boot.

For the boot CPU, the first use of PERCPU is in setup_pagetables. So
initialize PERCPU and set the processor ID before.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/setup.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 2f9fdc8..1ec5e38 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -428,6 +428,9 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     setup_cache();
 
+    percpu_init_areas();
+    set_processor_id(0); /* needed early, for smp_processor_id() */
+
     smp_clear_cpu_maps();
 
     device_tree_flattened = (void *)BOOT_MISC_VIRT_START
@@ -458,8 +461,6 @@ void __init start_xen(unsigned long boot_phys_offset,
     gic_init();
     make_cpus_ready(cpus, boot_phys_offset);
 
-    percpu_init_areas();
-    set_processor_id(0); /* needed early, for smp_processor_id() */
     set_current((struct vcpu *)0xfffff000); /* debug sanity */
     idle_vcpu[0] = current;
 
-- 
1.7.10.4


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