[PATCH] x86_64: fix tss limit

Fix the x86_64 TSS limit in TSS descriptor.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 3 deletions

diff --git a/include/asm-x86_64/desc.h b/include/asm-x86_64/desc.h
index 68ac3c62fe3..b837820c907 100644
--- a/include/asm-x86_64/desc.h
+++ b/include/asm-x86_64/desc.h
@@ -129,9 +129,16 @@ static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned
 
 static inline void set_tss_desc(unsigned cpu, void *addr)
 { 
-        set_tssldt_descriptor(&cpu_gdt_table[cpu][GDT_ENTRY_TSS], (unsigned long)addr, 
-                              DESC_TSS,
-                              sizeof(struct tss_struct) - 1);
+        /*
+         * sizeof(unsigned long) coming from an extra "long" at the end
+         * of the iobitmap. See tss_struct definition in processor.h
+         *
+         * -1? seg base+limit should be pointing to the address of the
+         * last valid byte
+         */
+        set_tssldt_descriptor(&cpu_gdt_table[cpu][GDT_ENTRY_TSS],
+                (unsigned long)addr, DESC_TSS,
+                IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1);
 } 
 
 static inline void set_ldt_desc(unsigned cpu, void *addr, int size)