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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2013-10-07 12:12:32 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-10-24 17:17:00 +0200
commit127c1feffff8078400f01372712c600d0f9eef51 (patch)
tree70c6b13e0b483459bf5e6669ac0973b35bab7c48 /arch/s390
parent6cef30034c32ebe448c844089c4168c411feeb63 (diff)
downloadlinux-127c1feffff8078400f01372712c600d0f9eef51.tar.bz2
s390/mm: do not initialize storage keys
With dirty and referenced bits implemented in software it is unnecessary to initialize the storage key for every page. With this patch not a single storage key operation is done for a system that does not use KVM. For KVM set_pte_at/pgste_set_key will do the initialization for the guest view of the storage key when the mapping for the page is established in the host. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/page.h7
-rw-r--r--arch/s390/kernel/early.c2
-rw-r--r--arch/s390/mm/pageattr.c4
3 files changed, 11 insertions, 2 deletions
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index 1e51f2915b2e..316c8503a3b4 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -30,7 +30,12 @@
#include <asm/setup.h>
#ifndef __ASSEMBLY__
-void storage_key_init_range(unsigned long start, unsigned long end);
+static inline void storage_key_init_range(unsigned long start, unsigned long end)
+{
+#if PAGE_DEFAULT_KEY
+ __storage_key_init_range(start, end);
+#endif
+}
static inline void clear_page(void *page)
{
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index dc8770d7173c..96543ac400a7 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -206,6 +206,7 @@ static noinline __init void clear_bss_section(void)
*/
static noinline __init void init_kernel_storage_key(void)
{
+#if PAGE_DEFAULT_KEY
unsigned long end_pfn, init_pfn;
end_pfn = PFN_UP(__pa(&_end));
@@ -213,6 +214,7 @@ static noinline __init void init_kernel_storage_key(void)
for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
page_set_storage_key(init_pfn << PAGE_SHIFT,
PAGE_DEFAULT_KEY, 0);
+#endif
}
static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index 990397420e6b..8400f494623f 100644
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -9,6 +9,7 @@
#include <asm/pgtable.h>
#include <asm/page.h>
+#if PAGE_DEFAULT_KEY
static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
{
asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
@@ -16,7 +17,7 @@ static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
return addr;
}
-void storage_key_init_range(unsigned long start, unsigned long end)
+void __storage_key_init_range(unsigned long start, unsigned long end)
{
unsigned long boundary, size;
@@ -36,6 +37,7 @@ void storage_key_init_range(unsigned long start, unsigned long end)
start += PAGE_SIZE;
}
}
+#endif
static pte_t *walk_page_table(unsigned long addr)
{