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[Xen-devel] [PATCH] x86: suppress SYSCALL feature for 32on64 guests

from [Jan Beulich]

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

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: 2007-04-27/xen/arch/x86/traps.c
===================================================================
--- 2007-04-27.orig/xen/arch/x86/traps.c        2007-04-27 11:02:48.000000000 
+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 == 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




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