---

yaml
---
r: 35661
b: refs/heads/master
c: 461a9af
h: refs/heads/master
i:
  35659: 112de4d
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 052e79941a042e5be4feffa03b1fd60d93fb9e9a
+refs/heads/master: 461a9afff5e731d6337c0f5b08a1e727ccd57e0a

trunk/Documentation/kernel-parameters.txt

@@ -1363,6 +1363,11 @@ running once the system is up.
 
 	reserve=	[KNL,BUGS] Force the kernel to ignore some iomem area
 
+	reservetop=	[IA-32]
+			Format: nn[KMG]
+			Reserves a hole at the top of the kernel virtual
+			address space.
+
 	resume=		[SWSUSP]
 			Specify the partition device for software suspend
 

trunk/arch/i386/kernel/setup.c

@@ -934,6 +934,24 @@ static void __init parse_cmdline_early (char ** cmdline_p)
 	}
 }
 
+/*
+ * reservetop=size reserves a hole at the top of the kernel address space which
+ * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
+ * so relocating the fixmap can be done before paging initialization.
+ */
+static int __init parse_reservetop(char *arg)
+{
+	unsigned long address;
+
+	if (!arg)
+		return -EINVAL;
+
+	address = memparse(arg, &arg);
+	reserve_top_address(address);
+	return 0;
+}
+early_param("reservetop", parse_reservetop);
+
 /*
  * Callback for efi_memory_walk.
  */