[Xen-devel] [PATCH 06 of 18] libxc: add xc_domain_memory_exchange_pages to wrap XENMEM_exchange

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1286892402 -3600
# Node ID d284f5cbda808a8ac816829bdd67c8a9f692c8e4
# Parent  6834151bfad74e84e201062d4e8f3ae58155cd43
libxc: add xc_domain_memory_exchange_pages to wrap XENMEM_exchange

Generalised from exchange_page in xc_offline_page.c

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

diff -r 6834151bfad7 -r d284f5cbda80 tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c   Tue Oct 12 15:06:42 2010 +0100
+++ b/tools/libxc/xc_domain.c   Tue Oct 12 15:06:42 2010 +0100
@@ -726,6 +726,37 @@ int xc_domain_populate_physmap_exact(xc_
     }
 
     return err;
+}
+
+int xc_domain_memory_exchange_pages(xc_interface *xch,
+                                    int domid,
+                                    unsigned long nr_in_extents,
+                                    unsigned int in_order,
+                                    xen_pfn_t *in_extents,
+                                    unsigned long nr_out_extents,
+                                    unsigned int out_order,
+                                    xen_pfn_t *out_extents)
+{
+    int rc;
+
+    struct xen_memory_exchange exchange = {
+        .in = {
+            .nr_extents   = nr_in_extents,
+            .extent_order = in_order,
+            .domid        = domid
+        },
+        .out = {
+            .nr_extents   = nr_out_extents,
+            .extent_order = out_order,
+            .domid        = domid
+        }
+    };
+    set_xen_guest_handle(exchange.in.extent_start, in_extents);
+    set_xen_guest_handle(exchange.out.extent_start, out_extents);
+
+    rc = xc_memory_op(xch, XENMEM_exchange, &exchange);
+
+    return rc;
 }
 
 static int xc_domain_pod_target(xc_interface *xch,
diff -r 6834151bfad7 -r d284f5cbda80 tools/libxc/xc_offline_page.c
--- a/tools/libxc/xc_offline_page.c     Tue Oct 12 15:06:42 2010 +0100
+++ b/tools/libxc/xc_offline_page.c     Tue Oct 12 15:06:42 2010 +0100
@@ -512,35 +512,6 @@ static int clear_pte(xc_interface *xch, 
                       __clear_pte, mfn);
 }
 
-static int exchange_page(xc_interface *xch, xen_pfn_t mfn,
-                     xen_pfn_t *new_mfn, int domid)
-{
-    int rc;
-    xen_pfn_t out_mfn;
-
-       struct xen_memory_exchange exchange = {
-               .in = {
-                       .nr_extents   = 1,
-                       .extent_order = 0,
-                       .domid        = domid
-               },
-               .out = {
-                       .nr_extents   = 1,
-                       .extent_order = 0,
-                       .domid        = domid
-               }
-    };
-    set_xen_guest_handle(exchange.in.extent_start, &mfn);
-    set_xen_guest_handle(exchange.out.extent_start, &out_mfn);
-
-    rc = xc_memory_op(xch, XENMEM_exchange, &exchange);
-
-    if (!rc)
-        *new_mfn = out_mfn;
-
-    return rc;
-}
-
 /*
  * Check if a page can be exchanged successfully
  */
@@ -704,7 +675,9 @@ int xc_exchange_page(xc_interface *xch, 
         goto failed;
     }
 
-    rc = exchange_page(xch, mfn, &new_mfn, domid);
+    rc = xc_domain_memory_exchange_pages(xch, domid,
+                                        1, 0, &mfn,
+                                        1, 0, &new_mfn);
 
     if (rc)
     {
diff -r 6834151bfad7 -r d284f5cbda80 tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h     Tue Oct 12 15:06:42 2010 +0100
+++ b/tools/libxc/xenctrl.h     Tue Oct 12 15:06:42 2010 +0100
@@ -828,6 +828,15 @@ int xc_domain_populate_physmap_exact(xc_
 /* Temporary for compatibility */
 #define xc_domain_memory_populate_physmap(x, d, nr, eo, mf, es) \
     xc_domain_populate_physmap_exact(x, d, nr, eo, mf, es)
+
+int xc_domain_memory_exchange_pages(xc_interface *xch,
+                                    int domid,
+                                    unsigned long nr_in_extents,
+                                    unsigned int in_order,
+                                    xen_pfn_t *in_extents,
+                                    unsigned long nr_out_extents,
+                                    unsigned int out_order,
+                                    xen_pfn_t *out_extents);
 
 int xc_domain_set_pod_target(xc_interface *xch,
                              uint32_t domid,

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