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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-06-13 10:36:00 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-08-24 09:23:55 +0200 |
| commit | 44b6cc8130e80e673ba8b3baf8e41891fe484786 (patch) | |
| tree | 08427794ef7fd6898a965addc41f672e544557b9 /arch/s390/mm/gmap.c | |
| parent | d5dcafee5f183e9aedddb147a89cb46ab038f26b (diff) | |
| download | linux-stable-44b6cc8130e80e673ba8b3baf8e41891fe484786.tar.gz linux-stable-44b6cc8130e80e673ba8b3baf8e41891fe484786.tar.bz2 linux-stable-44b6cc8130e80e673ba8b3baf8e41891fe484786.zip | |
s390/mm,kvm: flush gmap address space with IDTE
The __tlb_flush_mm() helper uses a global flush if the mm struct
has a gmap structure attached to it. Replace the global flush with
two individual flushes by means of the IDTE instruction if only a
single gmap is attached the the mm.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/gmap.c')
| -rw-r--r-- | arch/s390/mm/gmap.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 2ce6bb3bab32..3ba622702ce4 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -94,6 +94,7 @@ out: struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit) { struct gmap *gmap; + unsigned long gmap_asce; gmap = gmap_alloc(limit); if (!gmap) @@ -101,6 +102,11 @@ struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit) gmap->mm = mm; spin_lock(&mm->context.gmap_lock); list_add_rcu(&gmap->list, &mm->context.gmap_list); + if (list_is_singular(&mm->context.gmap_list)) + gmap_asce = gmap->asce; + else + gmap_asce = -1UL; + WRITE_ONCE(mm->context.gmap_asce, gmap_asce); spin_unlock(&mm->context.gmap_lock); return gmap; } @@ -230,6 +236,7 @@ EXPORT_SYMBOL_GPL(gmap_put); void gmap_remove(struct gmap *gmap) { struct gmap *sg, *next; + unsigned long gmap_asce; /* Remove all shadow gmaps linked to this gmap */ if (!list_empty(&gmap->children)) { @@ -243,6 +250,14 @@ void gmap_remove(struct gmap *gmap) /* Remove gmap from the pre-mm list */ spin_lock(&gmap->mm->context.gmap_lock); list_del_rcu(&gmap->list); + if (list_empty(&gmap->mm->context.gmap_list)) + gmap_asce = 0; + else if (list_is_singular(&gmap->mm->context.gmap_list)) + gmap_asce = list_first_entry(&gmap->mm->context.gmap_list, + struct gmap, list)->asce; + else + gmap_asce = -1UL; + WRITE_ONCE(gmap->mm->context.gmap_asce, gmap_asce); spin_unlock(&gmap->mm->context.gmap_lock); synchronize_rcu(); /* Put reference */ |