block: Convert bdrv_aio_discard() to byte-based

[mirror_qemu.git] / xen-hvm.c

diff --git a/xen-hvm.c b/xen-hvm.c
index 98ea44fdf34af0900e1f722870833d07e550a6e3..eb577926a1c2f3eb55f883e5e8dfbf83a5d92479 100644 (file)
--- a/xen-hvm.c
+++ b/xen-hvm.c
@@ -190,6 +190,9 @@ static void xen_ram_init(PCMachineState *pcms,
     /* Handle the machine opt max-ram-below-4g.  It is basically doing
      * min(xen limit, user limit).
      */
+    if (!user_lowmem) {
+        user_lowmem = HVM_BELOW_4G_RAM_END; /* default */
+    }
     if (HVM_BELOW_4G_RAM_END <= user_lowmem) {
         user_lowmem = HVM_BELOW_4G_RAM_END;
     }