xentrace: Only trace 64b vmexit when in long mode.

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>

xen/arch/x86/hvm/svm/svm.c

@@ -1217,9 +1217,14 @@ asmlinkage void svm_vmexit_handler(struct cpu_user_regs *regs)
 
     exit_reason = vmcb->exitcode;
 
-    HVMTRACE_ND(VMEXIT64, 1/*cycles*/, 3, exit_reason,
-                (uint32_t)regs->eip, (uint32_t)((uint64_t)regs->eip >> 32),
-                0, 0, 0);
+    if ( hvm_long_mode_enabled(v) )
+        HVMTRACE_ND(VMEXIT64, 1/*cycles*/, 3, exit_reason,
+                    (uint32_t)regs->eip, (uint32_t)((uint64_t)regs->eip >> 32),
+                    0, 0, 0);
+    else
+        HVMTRACE_ND(VMEXIT, 1/*cycles*/, 2, exit_reason,
+                    (uint32_t)regs->eip, 
+                    0, 0, 0, 0);
 
     if ( unlikely(exit_reason == VMEXIT_INVALID) )
     {

xen/arch/x86/hvm/vmx/vmx.c

@@ -2241,9 +2241,14 @@ asmlinkage void vmx_vmexit_handler(struct cpu_user_regs *regs)
 
     exit_reason = __vmread(VM_EXIT_REASON);
 
-    HVMTRACE_ND(VMEXIT64, 1/*cycles*/, 3, exit_reason,
-                (uint32_t)regs->eip, (uint32_t)((uint64_t)regs->eip >> 32),
-                0, 0, 0);
+    if ( hvm_long_mode_enabled(v) )
+        HVMTRACE_ND(VMEXIT64, 1/*cycles*/, 3, exit_reason,
+                    (uint32_t)regs->eip, (uint32_t)((uint64_t)regs->eip >> 32),
+                    0, 0, 0);
+    else
+        HVMTRACE_ND(VMEXIT, 1/*cycles*/, 2, exit_reason,
+                    (uint32_t)regs->eip, 
+                    0, 0, 0, 0);
 
     perfc_incra(vmexits, exit_reason);