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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>
This commit is contained in:
Martin Schwidefsky 2013-10-07 12:12:32 +02:00
parent 6cef30034c
commit 127c1fefff
3 changed files with 11 additions and 2 deletions
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7
arch/s390/include/asm/page.h
View File

@ -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)
{

2
arch/s390/kernel/early.c
View File

@ -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);

4
arch/s390/mm/pageattr.c
View File

@ -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)
{