From eea3678d4334925bf838e6f4bc88760811a84cd6 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Fri, 15 Apr 2016 12:45:45 +0200 Subject: [PATCH] s390/mm: flush tlb of shadows in all situations For now, the tlb of shadow gmap is only flushed when the parent is removed, not when it is removed upfront. Therefore other shadow gmaps can reuse the tables without the tlb getting flushed. Fix this by simply flushing the tlb 1. Before the shadow tables are removed (analogouos to other unshadow functions) 2. When the gmap is freed and therefore the top level pages are freed. Acked-by: Martin Schwidefsky Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger --- arch/s390/mm/gmap.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 6695a09a3885..b02d0d0cc641 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -173,6 +173,9 @@ static void gmap_free(struct gmap *gmap) { struct page *page, *next; + /* Flush tlb of all gmaps (if not already done for shadows) */ + if (!(gmap_is_shadow(gmap) && gmap->removed)) + gmap_flush_tlb(gmap); /* Free all segment & region tables. */ list_for_each_entry_safe(page, next, &gmap->crst_list, lru) __free_pages(page, 2); @@ -226,13 +229,10 @@ void gmap_remove(struct gmap *gmap) { struct gmap *sg, *next; - /* Flush tlb. */ - gmap_flush_tlb(gmap); /* Remove all shadow gmaps linked to this gmap */ if (!list_empty(&gmap->children)) { spin_lock(&gmap->shadow_lock); list_for_each_entry_safe(sg, next, &gmap->children, list) { - gmap_flush_tlb(sg); list_del(&sg->list); gmap_put(sg); } @@ -1360,6 +1360,7 @@ static void gmap_unshadow(struct gmap *sg) return; sg->removed = 1; gmap_call_notifier(sg, 0, -1UL); + gmap_flush_tlb(sg); table = (unsigned long *)(sg->asce & _ASCE_ORIGIN); switch (sg->asce & _ASCE_TYPE_MASK) { case _ASCE_TYPE_REGION1: -- 2.20.1