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-rw-r--r--include/asm-x86_64/desc.h13
1 files changed, 10 insertions, 3 deletions
diff --git a/include/asm-x86_64/desc.h b/include/asm-x86_64/desc.h
index 68ac3c62fe3d..b837820c9073 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)