diff -u include/asm/mach-xen/asm/processor.h.orig  include/asm/mach-xen/asm/processor.h
--- include/asm/mach-xen/asm/processor.h.orig   2007-06-14 00:15:55.000000000 +0400
+++ include/asm/mach-xen/asm/processor.h        2007-06-14 00:16:07.000000000 +0400
@@ -569,6 +569,32 @@
  */
 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 
+#ifdef CONFIG_X86_HIGH_ENTRY
+#define virtual_esp0(task) \
+       ((unsigned long)((task)->thread_info->virtual_stack + ((task)->thread.esp0 - (unsigned long)(task)->thread_info->real_stack)))
+#define load_virtual_esp0(tss, task)                                   \
+       do {                                                            \
+               tss->esp0 = virtual_esp0(task);                         \
+               if (likely(cpu_has_sep) && unlikely(tss->ss1 != (task)->thread.sysenter_cs)) {  \
+                       tss->ss1 = (task)->thread.sysenter_cs;          \
+                       wrmsr(MSR_IA32_SYSENTER_CS,                     \
+                               (task)->thread.sysenter_cs, 0);         \
+               }                                                       \
+       } while (0)
+
+#else
+
+#define virtual_esp0(task) ((task)->thread.esp0)
+#define load_virtual_esp0(tss, task) load_esp0(tss, &(task)->thread) 
+
+#endif
+
+#ifndef CONFIG_XEN
+#define __get_cpu_tss(cpu) (init_tss + (cpu))
+#else
+#define __get_cpu_tss(cpu) (&per_cpu(init_tss, cpu))
+#endif
+
 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 void show_trace(struct task_struct *task, struct pt_regs *regs, unsigned long *stack);

  desc.h
  fixmap.h
  highmem.h
  kmap_types.h
  mmu.h
  mmu_context.h
  page.h
  pgtable.h
  processor.h
  system.h
  tlbflush.h