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>

1 files changed, 0 insertions, 20 deletions

diff --git a/include/asm-x86/processor_32.h b/include/asm-x86/processor_32.h
index 57b345bc3c74..53037d1a6ae6 100644
--- a/include/asm-x86/processor_32.h
+++ b/include/asm-x86/processor_32.h
@@ -278,26 +278,6 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk);
 
 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
 
-static inline void native_load_sp0(struct tss_struct *tss, struct thread_struct *thread)
-{
-        tss->x86_tss.sp0 = thread->sp0;
-        /* This can only happen when SEP is enabled, no need to test "SEP"arately */
-        if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
-                tss->x86_tss.ss1 = thread->sysenter_cs;
-                wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
-        }
-}
-
-#ifdef CONFIG_PARAVIRT
-#include <asm/paravirt.h>
-#else
-
-static inline void load_sp0(struct tss_struct *tss, struct thread_struct *thread)
-{
-        native_load_sp0(tss, thread);
-}
-#endif /* CONFIG_PARAVIRT */
-
 /* generic versions from gas */
 #define GENERIC_NOP1    ".byte 0x90\n"
 #define GENERIC_NOP2            ".byte 0x89,0xf6\n"