ia64/pv_ops/xen: paravirtualize read/write ar.itc and ar.itm

paravirtualize ar.itc and ar.itm in order to support save/restore.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/ia64/include/asm/xen/interface.h b/arch/ia64/include/asm/xen/interface.h
index f00fab40854d..e951e740bdf2 100644
--- a/arch/ia64/include/asm/xen/interface.h
+++ b/arch/ia64/include/asm/xen/interface.h
@@ -209,6 +209,15 @@ struct mapped_regs {
                         unsigned long krs[8];   /* kernel registers */
                         unsigned long tmp[16];  /* temp registers
                                                    (e.g. for hyperprivops) */
+
+                        /* itc paravirtualization
+                         * vAR.ITC = mAR.ITC + itc_offset
+                         * itc_last is one which was lastly passed to
+                         * the guest OS in order to prevent it from
+                         * going backwords.
+                         */
+                        unsigned long itc_offset;
+                        unsigned long itc_last;
                 };
         };
 };