[Xen-devel] [PATCH] Include in balloon page tracking only PFNs which are marked as RAM in E820.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

From: Konrad Rzeszutek Wilk <kliw@xxxxxxxxxx>

Signed-off-by: Konrad Rzeszutek Wilk <kliw@xxxxxxxxxx>
---
 drivers/xen/balloon.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 168e61f..ef2edd8 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -416,8 +416,12 @@ static int __init balloon_init(void)
 
        /* Initialise the balloon with excess memory space. */
        for (pfn = xen_start_info->nr_pages; pfn < max_pfn; pfn++) {
-               page = pfn_to_page(pfn);
-               balloon_append(page);
+               int is_ram = page_is_ram(pfn);
+               if (is_ram) {
+                       page = pfn_to_page(pfn);
+                       if (PageReserved(page))
+                               balloon_append(page);
+               }
        }
 
        target_watch.callback = watch_target;
-- 
1.6.2.5


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