x86 setup: initialize LDTR and TR to make life easier to Intel VT

Intel VT doesn't like to engage when the protected-mode state isn't
fully initialized.  Make life easier for it by initializing LDTR (to
null) and TR (to a dummy hunk of low memory which will never actually
be touched.)

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/asm-x86/segment.h b/include/asm-x86/segment.h
index 1ff05a9f5513..57c8d3723836 100644
--- a/include/asm-x86/segment.h
+++ b/include/asm-x86/segment.h
@@ -9,6 +9,9 @@
 #define GDT_ENTRY_BOOT_DS       (GDT_ENTRY_BOOT_CS + 1)
 #define __BOOT_DS               (GDT_ENTRY_BOOT_DS * 8)
 
+#define GDT_ENTRY_BOOT_TSS      (GDT_ENTRY_BOOT_CS + 2)
+#define __BOOT_TSS              (GDT_ENTRY_BOOT_TSS * 8)
+
 #ifdef CONFIG_X86_32
 /*
  * The layout of the per-CPU GDT under Linux: