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s390/mm: do not initialize storage keys

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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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4
arch/s390/mm/pageattr.c
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@@ -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)
{