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>
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 9ff6e3c..06219e6 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -325,6 +325,26 @@
return 0;
}
+static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
+{
+ unsigned pages = roundup(entries * LDT_ENTRY_SIZE, PAGE_SIZE);
+ void *v = ldt;
+ int i;
+
+ for(i = 0; i < pages; i += PAGE_SIZE)
+ make_lowmem_page_readonly(v + i);
+}
+
+static void xen_free_ldt(struct desc_struct *ldt, unsigned entries)
+{
+ unsigned pages = roundup(entries * LDT_ENTRY_SIZE, PAGE_SIZE);
+ void *v = ldt;
+ int i;
+
+ for(i = 0; i < pages; i += PAGE_SIZE)
+ make_lowmem_page_readwrite(v + i);
+}
+
static void xen_set_ldt(const void *addr, unsigned entries)
{
struct mmuext_op *op;
@@ -1220,6 +1240,9 @@
.load_gs_index = xen_load_gs_index,
#endif
+ .alloc_ldt = xen_alloc_ldt,
+ .free_ldt = xen_free_ldt,
+
.store_gdt = native_store_gdt,
.store_idt = native_store_idt,
.store_tr = xen_store_tr,