x86: provide 64-bit with a load_sp0 function.

Paravirt guests need to inform the underlying hypervisor whenever the sp0
tss field changes. i386 already has such a function, and we use it for
x86_64 too. There's an unnecessary (for 64-bit) msr handling part in the original
version, and it is placed around an ifdef. Making no more sense in
processor_32.h, it is moved to the common header

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 2 insertions, 2 deletions

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index af56104b73ff..e3a3610ade10 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -639,7 +639,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
         /*
          * Reload esp0, LDT and the page table pointer:
          */
-        tss->x86_tss.sp0 = next->sp0;
+        load_sp0(tss, next);
 
         /* 
          * Switch DS and ES.
diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index 2ea02a71b644..5bd42ce144da 100644
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -614,7 +614,7 @@ do_rest:
         start_rip = setup_trampoline();
 
         init_rsp = c_idle.idle->thread.sp;
-        per_cpu(init_tss, cpu).x86_tss.sp0 = init_rsp;
+        load_sp0(&per_cpu(init_tss, cpu), &c_idle.idle->thread);
         initial_code = start_secondary;
         clear_tsk_thread_flag(c_idle.idle, TIF_FORK);