[S390] Change vmalloc defintions

Currently the vmalloc area starts at a dynamic address depending on
the memory size. There was also an 8MB security hole after the
physical memory to catch out-of-bounds accesses.
We can simplify the code by putting the vmalloc area explicitely at
the top of the kernel mapping and setting the vmalloc size to a fixed
value of 128MB/128GB for 31bit/64bit systems. Part of the vmalloc
area will be used for the vmem_map. This leaves an area of 96MB/1GB
for normal vmalloc allocations.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 10 insertions, 16 deletions

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index d68a4025486e..d071a81b62da 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -617,7 +617,7 @@ EXPORT_SYMBOL_GPL(real_memory_size);
 static void __init setup_memory_end(void)
 {
         unsigned long memory_size;
-        unsigned long max_mem, max_phys;
+        unsigned long max_mem;
         int i;
 
 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
@@ -625,10 +625,10 @@ static void __init setup_memory_end(void)
                 memory_end = ZFCPDUMP_HSA_SIZE;
 #endif
         memory_size = 0;
-        max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
         memory_end &= PAGE_MASK;
 
-        max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
+        max_mem = memory_end ? min(VMALLOC_START, memory_end) : VMALLOC_START;
+        memory_end = min(max_mem, memory_end);
 
         for (i = 0; i < MEMORY_CHUNKS; i++) {
                 struct mem_chunk *chunk = &memory_chunk[i];
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index fb9c5a85aa56..ee625c8c3b28 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -15,10 +15,6 @@
 #include <asm/setup.h>
 #include <asm/tlbflush.h>
 
-unsigned long vmalloc_end;
-EXPORT_SYMBOL(vmalloc_end);
-
-static struct page *vmem_map;
 static DEFINE_MUTEX(vmem_mutex);
 
 struct memory_segment {
@@ -188,8 +184,8 @@ static int vmem_add_mem_map(unsigned long start, unsigned long size)
         pte_t  pte;
         int ret = -ENOMEM;
 
-        map_start = vmem_map + PFN_DOWN(start);
-        map_end = vmem_map + PFN_DOWN(start + size);
+        map_start = VMEM_MAP + PFN_DOWN(start);
+        map_end = VMEM_MAP + PFN_DOWN(start + size);
 
         start_addr = (unsigned long) map_start & PAGE_MASK;
         end_addr = PFN_ALIGN((unsigned long) map_end);
@@ -254,7 +250,7 @@ static int insert_memory_segment(struct memory_segment *seg)
 {
         struct memory_segment *tmp;
 
-        if (PFN_DOWN(seg->start + seg->size) > max_pfn ||
+        if (seg->start + seg->size >= VMALLOC_START ||
             seg->start + seg->size < seg->start)
                 return -ERANGE;
 
@@ -357,17 +353,15 @@ out:
 
 /*
  * map whole physical memory to virtual memory (identity mapping)
+ * we reserve enough space in the vmalloc area for vmemmap to hotplug
+ * additional memory segments.
  */
 void __init vmem_map_init(void)
 {
-        unsigned long map_size;
         int i;
 
-        map_size = ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * sizeof(struct page);
-        vmalloc_end = PFN_ALIGN(VMALLOC_END_INIT) - PFN_ALIGN(map_size);
-        vmem_map = (struct page *) vmalloc_end;
-        NODE_DATA(0)->node_mem_map = vmem_map;
-
+        BUILD_BUG_ON((unsigned long)VMEM_MAP + VMEM_MAP_SIZE > VMEM_MAP_MAX);
+        NODE_DATA(0)->node_mem_map = VMEM_MAP;
         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++)
                 vmem_add_mem(memory_chunk[i].addr, memory_chunk[i].size);
 }