Support different log levels.

This will let us add more verbose logs for debugging but have them
compiled out most of the time.

Change-Id: Iaae468e41025a165b5e67fa6fec5422f004c6a44
diff --git a/src/vcpu.c b/src/vcpu.c
index 2f1b5fc..b77689d 100644
--- a/src/vcpu.c
+++ b/src/vcpu.c
@@ -164,10 +164,11 @@
 	sl_unlock(&vm->lock);
 
 	if (!resume) {
-		dlog("Stage-2 page fault: pc=%#x, vmid=%u, vcpu=%u, "
-		     "vaddr=%#x, ipaddr=%#x, mode=%#x\n",
-		     f->pc, vm->id, vcpu_index(current), f->vaddr, f->ipaddr,
-		     f->mode);
+		dlog_warning(
+			"Stage-2 page fault: pc=%#x, vmid=%u, vcpu=%u, "
+			"vaddr=%#x, ipaddr=%#x, mode=%#x\n",
+			f->pc, vm->id, vcpu_index(current), f->vaddr, f->ipaddr,
+			f->mode);
 	}
 
 	return resume;