x86/platform: Introduce APIC post-initialization callback

Some subarchitectures (such as vSMP) need to slightly adjust the
underlying APIC structure. Add an APIC post-initialization callback
to 'struct x86_platform_ops' for this purpose and use it for
adjusting the APIC structure on vSMP systems.

Signed-off-by: Ido Yariv <ido@wizery.com>
Acked-by: Shai Fultheim <shai@scalemp.com>
Link: http://lkml.kernel.org/r/1338675095-27260-1-git-send-email-ido@wizery.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index 8eeb55a551b4..59eea855f451 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -187,12 +187,25 @@ static void __init vsmp_cap_cpus(void)
 #endif
 }
 
+static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
+{
+        return hard_smp_processor_id() >> index_msb;
+}
+
+static void vsmp_apic_post_init(void)
+{
+        /* need to update phys_pkg_id */
+        apic->phys_pkg_id = apicid_phys_pkg_id;
+}
+
 void __init vsmp_init(void)
 {
         detect_vsmp_box();
         if (!is_vsmp_box())
                 return;
 
+        x86_platform.apic_post_init = vsmp_apic_post_init;
+
         vsmp_cap_cpus();
 
         set_vsmp_pv_ops();