From 5b062bd4940f81e0bd26b0d75f56d7abebf0309f Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Tue, 8 Mar 2016 12:17:40 +0100 Subject: s390/mm: prepare for EDAT1/EDAT2 support in gmap shadow In preparation for EDAT1/EDAT2 support for gmap shadows, we have to store the requested edat level in the gmap shadow. The edat level used during shadow translation is a property of the gmap shadow. Depending on that level, the gmap shadow will look differently for the same guest tables. We have to store it internally in order to support it later. Acked-by: Martin Schwidefsky Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger --- arch/s390/mm/gmap.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'arch/s390/mm') diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index a7dfb337e133..f0b2a531c599 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -1382,17 +1382,20 @@ static void gmap_unshadow(struct gmap *sg) * gmap_find_shadow - find a specific asce in the list of shadow tables * @parent: pointer to the parent gmap * @asce: ASCE for which the shadow table is created + * @edat_level: edat level to be used for the shadow translation * * Returns the pointer to a gmap if a shadow table with the given asce is * already available, ERR_PTR(-EAGAIN) if another one is just being created, * otherwise NULL */ -static struct gmap *gmap_find_shadow(struct gmap *parent, unsigned long asce) +static struct gmap *gmap_find_shadow(struct gmap *parent, unsigned long asce, + int edat_level) { struct gmap *sg; list_for_each_entry(sg, &parent->children, list) { - if (sg->orig_asce != asce || sg->removed) + if (sg->orig_asce != asce || sg->edat_level != edat_level || + sg->removed) continue; if (!sg->initialized) return ERR_PTR(-EAGAIN); @@ -1406,6 +1409,7 @@ static struct gmap *gmap_find_shadow(struct gmap *parent, unsigned long asce) * gmap_shadow - create/find a shadow guest address space * @parent: pointer to the parent gmap * @asce: ASCE for which the shadow table is created + * @edat_level: edat level to be used for the shadow translation * * The pages of the top level page table referred by the asce parameter * will be set to read-only and marked in the PGSTEs of the kvm process. @@ -1416,7 +1420,8 @@ static struct gmap *gmap_find_shadow(struct gmap *parent, unsigned long asce) * ERR_PTR(-EAGAIN) if the caller has to retry and ERR_PTR(-EFAULT) if the * parent gmap table could not be protected. */ -struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce) +struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce, + int edat_level) { struct gmap *sg, *new; unsigned long limit; @@ -1424,7 +1429,7 @@ struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce) BUG_ON(gmap_is_shadow(parent)); spin_lock(&parent->shadow_lock); - sg = gmap_find_shadow(parent, asce); + sg = gmap_find_shadow(parent, asce, edat_level); spin_unlock(&parent->shadow_lock); if (sg) return sg; @@ -1436,10 +1441,11 @@ struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce) new->mm = parent->mm; new->parent = gmap_get(parent); new->orig_asce = asce; + new->edat_level = edat_level; new->initialized = false; spin_lock(&parent->shadow_lock); /* Recheck if another CPU created the same shadow */ - sg = gmap_find_shadow(parent, asce); + sg = gmap_find_shadow(parent, asce, edat_level); if (sg) { spin_unlock(&parent->shadow_lock); gmap_free(new); -- cgit v1.2.3