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KVM: s390/mm: support gmap page tables with less than 5 levels

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Add an addressing limit to the gmap address spaces and only allocate
the page table levels that are needed for the given limit. The limit
is fixed and can not be changed after a gmap has been created.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2014-07-01 14:36:04 +02:00
committed by Christian Borntraeger
parent 527e30b41d
commit c6c956b80b
3 changed files with 58 additions and 32 deletions
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3
arch/s390/include/asm/pgtable.h
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@@ -808,6 +808,7 @@ struct gmap {
spinlock_t guest_table_lock;
unsigned long *table;
unsigned long asce;
unsigned long asce_end;
void *private;
bool pfault_enabled;
};
@@ -844,7 +845,7 @@ struct gmap_notifier {
void (*notifier_call)(struct gmap *gmap, unsigned long gaddr);
};
struct gmap *gmap_alloc(struct mm_struct *mm);
struct gmap *gmap_alloc(struct mm_struct *mm, unsigned long limit);
void gmap_free(struct gmap *gmap);
void gmap_enable(struct gmap *gmap);
void gmap_disable(struct gmap *gmap);