From: Chris Lalancette <clalance@redhat.com>
Date: Thu, 9 Jul 2009 18:01:49 +0200
Subject: [xen] ia64: add get/set_address_size support
Message-id: 4A56146D.7050000@redhat.com
O-Subject: [RHEL5.4 PATCH 1/2]: Hypervisor ia64 get/set_address_size
Bugzilla: 510069
RH-Acked-by: Rik van Riel <riel@redhat.com>
RH-Acked-by: Justin M. Forbes <jforbes@redhat.com>
RH-Acked-by: Don Dutile <ddutile@redhat.com>

This patches the ia64 hypervisor to understand the
XEN_DOMCTL_{get,set}_address_size, and is a backport of xen-unstable c/s 19121

Part of the solution for BZ 510069

diff --git a/arch/ia64/xen/dom0_ops.c b/arch/ia64/xen/dom0_ops.c
index 6079dc5..ee51ebe 100644
--- a/arch/ia64/xen/dom0_ops.c
+++ b/arch/ia64/xen/dom0_ops.c
@@ -214,6 +214,39 @@ long arch_do_domctl(xen_domctl_t *op, XEN_GUEST_HANDLE(xen_domctl_t) u_domctl)
     }
     break;
 
+    case XEN_DOMCTL_set_address_size:
+    {
+        struct domain *d = rcu_lock_domain_by_id(op->domain);
+
+        ret = -ESRCH;
+        if (d == NULL)
+            break;
+
+        ret = -EINVAL;
+        if (op->u.address_size.size == BITS_PER_LONG)
+            ret = 0;
+
+        rcu_unlock_domain(d);
+    }
+    break;
+
+    case XEN_DOMCTL_get_address_size:
+    {
+        struct domain *d = rcu_lock_domain_by_id(op->domain);
+
+        ret = -ESRCH;
+        if (d  == NULL)
+            break;
+
+        ret = 0;
+        op->u.address_size.size = BITS_PER_LONG;
+        rcu_unlock_domain(d);
+
+        if (copy_to_guest(u_domctl, op, 1))
+            ret = -EFAULT;
+    }
+    break;
+
     default:
         printk("arch_do_domctl: unrecognized domctl: %d!!!\n",op->cmd);
         ret = -ENOSYS;