x86/paravirt/xen: properly fill out the ldt ops

LTP testing showed that Xen does not properly implement
sys_modify_ldt().  This patch does the final little bits needed to
make the ldt work properly.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 1 deletions

diff --git a/include/asm-x86/desc.h b/include/asm-x86/desc.h
index a44c4dc70590..24a524f5e1a2 100644
--- a/include/asm-x86/desc.h
+++ b/include/asm-x86/desc.h
@@ -97,7 +97,15 @@ static inline int desc_empty(const void *ptr)
         native_write_gdt_entry(dt, entry, desc, type)
 #define write_idt_entry(dt, entry, g)           \
         native_write_idt_entry(dt, entry, g)
-#endif
+
+static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
+{
+}
+
+static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
+{
+}
+#endif  /* CONFIG_PARAVIRT */
 
 static inline void native_write_idt_entry(gate_desc *idt, int entry,
                                           const gate_desc *gate)