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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-07 10:12:32 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-24 15:17:00 (GMT) |
| commit | 127c1feffff8078400f01372712c600d0f9eef51 (patch) | |
| tree | 70c6b13e0b483459bf5e6669ac0973b35bab7c48 /arch/s390 | |
| parent | 6cef30034c32ebe448c844089c4168c411feeb63 (diff) | |
| download | linux-127c1feffff8078400f01372712c600d0f9eef51.tar.xz | |
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.h | 7 | ||||
| -rw-r--r-- | arch/s390/kernel/early.c | 2 | ||||
| -rw-r--r-- | arch/s390/mm/pageattr.c | 4 |
3 files changed, 11 insertions, 2 deletions
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index 1e51f29..316c850 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 dc8770d..96543ac 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 9903974..8400f49 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) { |