1 files changed, 15 insertions, 3 deletions

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 1093f80c162d..b2c7179fa263 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -173,9 +173,21 @@ static unsigned long __init xen_get_max_pages(void)
         domid_t domid = DOMID_SELF;
         int ret;
 
-        ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid);
-        if (ret > 0)
-                max_pages = ret;
+        /*
+         * For the initial domain we use the maximum reservation as
+         * the maximum page.
+         *
+         * For guest domains the current maximum reservation reflects
+         * the current maximum rather than the static maximum. In this
+         * case the e820 map provided to us will cover the static
+         * maximum region.
+         */
+        if (xen_initial_domain()) {
+                ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid);
+                if (ret > 0)
+                        max_pages = ret;
+        }
+
         return min(max_pages, MAX_DOMAIN_PAGES);
 }