From: "Jan Beulich" <jbeulich@novell.com>
Subject: [PATCH] x86: suppress SYSCALL feature for 32on64 guests
Date: Mon, 14 May 2007 17:05:17 +0200
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.. since Xen cannot handle it.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

Index: 2007-04-27/xen/arch/x86/traps.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- 2007-04-27.orig/xen/arch/x86/traps.c	2007-04-27 11:02:48.0000000=
00 +0200
+++ 2007-04-27/xen/arch/x86/traps.c	2007-05-09 17:56:43.000000000 =
+0200
@@ -594,6 +594,8 @@ static int emulate_forced_invalid_op(str
     else if ( regs->eax =3D=3D 0x80000001 )
     {
         /* Modify Feature Information. */
+        if ( is_pv_32on64_vcpu(current) )
+            clear_bit(X86_FEATURE_SYSCALL % 32, &d);
         clear_bit(X86_FEATURE_RDTSCP % 32, &d);
     }
     else