1 files changed, 17 insertions, 3 deletions

diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index 3b9bda46487a..05794c566e87 100644
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -26,8 +26,15 @@
 /* Pseudo-flag used for virtual NMI, which we don't implement yet */
 #define XEN_EFLAGS_NMI  0x80000000
 
-#if 0
-#include <asm/percpu.h>
+#if 1
+/*
+        x86-64 does not yet support direct access to percpu variables
+        via a segment override, so we just need to make sure this code
+        never gets used
+ */
+#define BUG                     ud2a
+#define PER_CPU_VAR(var, off)   0xdeadbeef
+#endif
 
 /*
         Enable events.  This clears the event mask and tests the pending
@@ -35,6 +42,8 @@
         events, then enter the hypervisor to get them handled.
  */
 ENTRY(xen_irq_enable_direct)
+        BUG
+
         /* Unmask events */
         movb $0, PER_CPU_VAR(xen_vcpu_info, XEN_vcpu_info_mask)
 
@@ -58,6 +67,8 @@ ENDPATCH(xen_irq_enable_direct)
         non-zero.
  */
 ENTRY(xen_irq_disable_direct)
+        BUG
+
         movb $1, PER_CPU_VAR(xen_vcpu_info, XEN_vcpu_info_mask)
 ENDPATCH(xen_irq_disable_direct)
         ret
@@ -74,6 +85,8 @@ ENDPATCH(xen_irq_disable_direct)
         Xen and x86 use opposite senses (mask vs enable).
  */
 ENTRY(xen_save_fl_direct)
+        BUG
+
         testb $0xff, PER_CPU_VAR(xen_vcpu_info, XEN_vcpu_info_mask)
         setz %ah
         addb %ah,%ah
@@ -91,6 +104,8 @@ ENDPATCH(xen_save_fl_direct)
         if so.
  */
 ENTRY(xen_restore_fl_direct)
+        BUG
+
         testb $X86_EFLAGS_IF>>8, %ah
         setz PER_CPU_VAR(xen_vcpu_info, XEN_vcpu_info_mask)
         /* Preempt here doesn't matter because that will deal with
@@ -133,7 +148,6 @@ check_events:
         pop %rcx
         pop %rax
         ret
-#endif
 
 ENTRY(xen_adjust_exception_frame)
         mov 8+0(%rsp),%rcx