[IA64] Fix xencomm for xm mem-set command

This patch saves and restores the hypercall parameter within xencomm.

Signed-off-by: Masaki Kanno <kanno.masaki@jp.fujitsu.com>

linux-2.6-xen-sparse/arch/ia64/xen/xcom_hcall.c

@@ -221,10 +221,17 @@ xencommize_memory_reservation (xen_memory_reservation_t *mop)
 int
 xencomm_hypercall_memory_op(unsigned int cmd, void *arg)
 {
+	XEN_GUEST_HANDLE(xen_pfn_t) extent_start_va[2];
+	xen_memory_reservation_t *xmr = NULL, *xme_in = NULL, *xme_out = NULL;
+	int rc;
+
 	switch (cmd) {
 	case XENMEM_increase_reservation:
 	case XENMEM_decrease_reservation:
 	case XENMEM_populate_physmap:
+		xmr = (xen_memory_reservation_t *)arg;
+		xen_guest_handle(extent_start_va[0]) =
+			xen_guest_handle(xmr->extent_start);
 		xencommize_memory_reservation((xen_memory_reservation_t *)arg);
 		break;
 		
@@ -232,6 +239,12 @@ xencomm_hypercall_memory_op(unsigned int cmd, void *arg)
 		break;
 
 	case XENMEM_exchange:
+		xme_in  = &((xen_memory_exchange_t *)arg)->in;
+		xme_out = &((xen_memory_exchange_t *)arg)->out;
+		xen_guest_handle(extent_start_va[0]) =
+			xen_guest_handle(xme_in->extent_start);
+		xen_guest_handle(extent_start_va[1]) =
+			xen_guest_handle(xme_out->extent_start);
 		xencommize_memory_reservation
 			(&((xen_memory_exchange_t *)arg)->in);
 		xencommize_memory_reservation
@@ -243,8 +256,25 @@ xencomm_hypercall_memory_op(unsigned int cmd, void *arg)
 		return -ENOSYS;
 	}
 
-	return xencomm_arch_hypercall_memory_op
-		(cmd, xencomm_create_inline(arg));
+	rc =  xencomm_arch_hypercall_memory_op(cmd, xencomm_create_inline(arg));
+
+	switch (cmd) {
+	case XENMEM_increase_reservation:
+	case XENMEM_decrease_reservation:
+	case XENMEM_populate_physmap:
+		xen_guest_handle(xmr->extent_start) =
+			xen_guest_handle(extent_start_va[0]);
+		break;
+
+	case XENMEM_exchange:
+		xen_guest_handle(xme_in->extent_start) =
+			xen_guest_handle(extent_start_va[0]);
+		xen_guest_handle(xme_out->extent_start) =
+			xen_guest_handle(extent_start_va[1]);
+		break;
+	}
+
+	return rc;
 }
 
 unsigned long