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s390/kvm: Provide function for setting the guest storage key

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From time to time we need to set the guest storage key. Lets
provide a helper function that handles the changes with all the
right locking and checking.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger
2013-05-27 10:42:04 +02:00
committed by Martin Schwidefsky
parent 25b41a7b67
commit 24d5dd0208
2 changed files with 51 additions and 0 deletions
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3
arch/s390/include/asm/pgalloc.h
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@@ -22,6 +22,9 @@ unsigned long *page_table_alloc(struct mm_struct *, unsigned long);
void page_table_free(struct mm_struct *, unsigned long *);
void page_table_free_rcu(struct mmu_gather *, unsigned long *);
int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
unsigned long key, bool nq);
static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
{
typedef struct { char _[n]; } addrtype;