ia64/xen: xencomm conversion functions for hypercalls

On ia64/xen, pointer arguments for hypercall is passed
by pseudo physical address(guest physical address.)
So such hypercalls needs address conversion functions.
This patch implements concrete conversion functions for
such hypercalls.

Signed-off-by: Akio Takebe <takebe_akio@jp.fujitsu.com>
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/ia64/xen/xencomm.c b/arch/ia64/xen/xencomm.c
index 3dc307f0a40d..1f5d7ac82e97 100644
--- a/arch/ia64/xen/xencomm.c
+++ b/arch/ia64/xen/xencomm.c
@@ -19,11 +19,22 @@
 #include <linux/mm.h>
 
 static unsigned long kernel_virtual_offset;
+static int is_xencomm_initialized;
+
+/* for xen early printk. It uses console io hypercall which uses xencomm.
+ * However early printk may use it before xencomm initialization.
+ */
+int
+xencomm_is_initialized(void)
+{
+        return is_xencomm_initialized;
+}
 
 void
 xencomm_initialize(void)
 {
         kernel_virtual_offset = KERNEL_START - ia64_tpa(KERNEL_START);
+        is_xencomm_initialized = 1;
 }
 
 /* Translate virtual address to physical address.  */