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>
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@ -30,7 +30,12 @@
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#include <asm/setup.h>
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#ifndef __ASSEMBLY__
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void storage_key_init_range(unsigned long start, unsigned long end);
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static inline void storage_key_init_range(unsigned long start, unsigned long end)
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{
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#if PAGE_DEFAULT_KEY
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__storage_key_init_range(start, end);
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#endif
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}
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static inline void clear_page(void *page)
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{
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@ -206,6 +206,7 @@ static noinline __init void clear_bss_section(void)
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*/
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static noinline __init void init_kernel_storage_key(void)
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{
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#if PAGE_DEFAULT_KEY
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unsigned long end_pfn, init_pfn;
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end_pfn = PFN_UP(__pa(&_end));
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@ -213,6 +214,7 @@ static noinline __init void init_kernel_storage_key(void)
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for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
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page_set_storage_key(init_pfn << PAGE_SHIFT,
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PAGE_DEFAULT_KEY, 0);
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#endif
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}
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static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
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@ -9,6 +9,7 @@
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#if PAGE_DEFAULT_KEY
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static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
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{
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asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
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@ -16,7 +17,7 @@ static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
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return addr;
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}
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void storage_key_init_range(unsigned long start, unsigned long end)
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void __storage_key_init_range(unsigned long start, unsigned long end)
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{
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unsigned long boundary, size;
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@ -36,6 +37,7 @@ void storage_key_init_range(unsigned long start, unsigned long end)
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start += PAGE_SIZE;
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}
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}
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#endif
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static pte_t *walk_page_table(unsigned long addr)
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{
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