xen: allow balloon driver to use more than one memory region

[pandora-kernel.git] / drivers / xen / balloon.c

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 9efb993..fc43b53 100644 (file)
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -555,11 +555,32 @@ void free_xenballooned_pages(int nr_pages, struct page** pages)
 }
 EXPORT_SYMBOL(free_xenballooned_pages);
 
-static int __init balloon_init(void)
+static void __init balloon_add_region(unsigned long start_pfn,
+                                     unsigned long pages)
 {
        unsigned long pfn, extra_pfn_end;
        struct page *page;
 
+       /*
+        * If the amount of usable memory has been limited (e.g., with
+        * the 'mem' command line parameter), don't add pages beyond
+        * this limit.
+        */
+       extra_pfn_end = min(max_pfn, start_pfn + pages);
+
+       for (pfn = start_pfn; pfn < extra_pfn_end; pfn++) {
+               page = pfn_to_page(pfn);
+               /* totalram_pages and totalhigh_pages do not
+                  include the boot-time balloon extension, so
+                  don't subtract from it. */
+               __balloon_append(page);
+       }
+}
+
+static int __init balloon_init(void)
+{
+       int i;
+
        if (!xen_domain())
                return -ENODEV;
 
@@ -587,23 +608,12 @@ static int __init balloon_init(void)
 
        /*
         * Initialize the balloon with pages from the extra memory
-        * region (see arch/x86/xen/setup.c).
-        *
-        * If the amount of usable memory has been limited (e.g., with
-        * the 'mem' command line parameter), don't add pages beyond
-        * this limit.
+        * regions (see arch/x86/xen/setup.c).
         */
-       extra_pfn_end = min(max_pfn,
-                           (unsigned long)PFN_DOWN(xen_extra_mem_start
-                                                   + xen_extra_mem_size));
-       for (pfn = PFN_UP(xen_extra_mem_start);
-            pfn < extra_pfn_end;
-            pfn++) {
-               page = pfn_to_page(pfn);
-               /* totalram_pages and totalhigh_pages do not include the boot-time
-                  balloon extension, so don't subtract from it. */
-               __balloon_append(page);
-       }
+       for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
+               if (xen_extra_mem[i].size)
+                       balloon_add_region(PFN_UP(xen_extra_mem[i].start),
+                                          PFN_DOWN(xen_extra_mem[i].size));
 
        return 0;
 }