s390: move vmalloc option parsing to startup code

Few other crucial memory setup options are already handled in
the startup code. Those values are needed by kaslr and kasan
implementations. "vmalloc" is the last piece required for future
improvements such as early decision on kernel page levels depth required
for actual memory setup, as well as vmalloc memory area access monitoring
in kasan.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c
index 3c49bde8aa5e3d6f82d3e1c2157b35421e9cd7e4..449d26a42f3f1f73497af2134393f3b778d9cc8b 100644 (file)
--- a/arch/s390/boot/ipl_parm.c
+++ b/arch/s390/boot/ipl_parm.c
@@ -7,6 +7,7 @@
 #include <asm/sections.h>
 #include <asm/boot_data.h>
 #include <asm/facility.h>
+#include <asm/pgtable.h>
 #include <asm/uv.h>
 #include "boot.h"
 
@@ -14,6 +15,7 @@ char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
 struct ipl_parameter_block __bootdata_preserved(ipl_block);
 int __bootdata_preserved(ipl_block_valid);
 
+unsigned long __bootdata(vmalloc_size) = VMALLOC_DEFAULT_SIZE;
 unsigned long __bootdata(memory_end);
 int __bootdata(memory_end_set);
 int __bootdata(noexec_disabled);
@@ -226,6 +228,9 @@ void parse_boot_command_line(void)
                        memory_end_set = 1;
                }
 
+               if (!strcmp(param, "vmalloc"))
+                       vmalloc_size = round_up(memparse(val, NULL), PAGE_SIZE);
+
                if (!strcmp(param, "noexec")) {
                        rc = kstrtobool(val, &enabled);
                        if (!rc && !enabled)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 9b274fcaacb680b1d2cc63c2ac7c3fe57ec1cde1..0c4600725fc2e908b98578d9febaa93f82df4ed5 100644 (file)
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -86,6 +86,7 @@ extern unsigned long zero_page_mask;
  */
 extern unsigned long VMALLOC_START;
 extern unsigned long VMALLOC_END;
+#define VMALLOC_DEFAULT_SIZE   ((128UL << 30) - MODULES_LEN)
 extern struct page *vmemmap;
 
 #define VMEM_MAX_PHYS ((unsigned long) vmemmap)

diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index c5cfff7b1f91e6dbed77fd4a6ff8761c7a90e661..a82d5a98428a0e1fca4126739ccd8ffd5f9be665 100644 (file)
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -83,6 +83,7 @@ struct parmarea {
 extern int noexec_disabled;
 extern int memory_end_set;
 extern unsigned long memory_end;
+extern unsigned long vmalloc_size;
 extern unsigned long max_physmem_end;
 
 #define MACHINE_IS_VM          (S390_lowcore.machine_flags & MACHINE_FLAG_VM)

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 2b94b0ad358827d4e961a3fbce8be9bd5fb41cd2..0c3f1cd69ed1cc0b2c2036e0553b60946a47d55d 100644 (file)
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -99,6 +99,7 @@ int __bootdata_preserved(prot_virt_guest);
 int __bootdata(noexec_disabled);
 int __bootdata(memory_end_set);
 unsigned long __bootdata(memory_end);
+unsigned long __bootdata(vmalloc_size);
 unsigned long __bootdata(max_physmem_end);
 struct mem_detect_info __bootdata(mem_detect);
 
@@ -302,15 +303,6 @@ void machine_power_off(void)
 void (*pm_power_off)(void) = machine_power_off;
 EXPORT_SYMBOL_GPL(pm_power_off);
 
-static int __init parse_vmalloc(char *arg)
-{
-       if (!arg)
-               return -EINVAL;
-       VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
-       return 0;
-}
-early_param("vmalloc", parse_vmalloc);
-
 void *restart_stack __section(.data);
 
 unsigned long stack_alloc(void)
@@ -563,10 +555,9 @@ static void __init setup_resources(void)
 
 static void __init setup_memory_end(void)
 {
-       unsigned long vmax, vmalloc_size, tmp;
+       unsigned long vmax, tmp;
 
        /* Choose kernel address space layout: 3 or 4 levels. */
-       vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
        if (IS_ENABLED(CONFIG_KASAN)) {
                vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
                           ? _REGION1_SIZE