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Commit 127c1fef authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 6cef3003

arch/s390/include/asm/page.h

+6 −1
Original line number Diff line number Diff line
@@ -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)

{

arch/s390/kernel/early.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

arch/s390/mm/pageattr.c

+3 −1
Original line number Diff line number Diff line
@@ -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)

{