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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-09-22 22:58:44 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-09-22 22:58:44 +0200
commit846955c8afe5ebca2f8841b042ca3342e08a092b (patch)
tree85584d6f009932c18e55562c3303c6331aebe0ca /arch/s390/mm
parent2e50195f58ec045bc4601ec94478d957974f4aa4 (diff)
downloadlinux-linaro-android-846955c8afe5ebca2f8841b042ca3342e08a092b.tar.gz
[S390] hibernation: fix guest page hinting related crash
On resume the system that loads the to be resumed image might have unstable pages. When the resume image is copied back and a write access happen to an unstable page this causes an exception and the system crashes. To fix this set all free pages to stable before copying the resumed image data. Also after everything has been restored set all free pages of the resumed system to unstable again. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/page-states.c52
1 files changed, 44 insertions, 8 deletions
diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c
index f92ec203ad9..098923ae458 100644
--- a/arch/s390/mm/page-states.c
+++ b/arch/s390/mm/page-states.c
@@ -50,28 +50,64 @@ void __init cmma_init(void)
cmma_flag = 0;
}
-void arch_free_page(struct page *page, int order)
+static inline void set_page_unstable(struct page *page, int order)
{
int i, rc;
- if (!cmma_flag)
- return;
for (i = 0; i < (1 << order); i++)
asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
: "=&d" (rc)
- : "a" ((page_to_pfn(page) + i) << PAGE_SHIFT),
+ : "a" (page_to_phys(page + i)),
"i" (ESSA_SET_UNUSED));
}
-void arch_alloc_page(struct page *page, int order)
+void arch_free_page(struct page *page, int order)
{
- int i, rc;
-
if (!cmma_flag)
return;
+ set_page_unstable(page, order);
+}
+
+static inline void set_page_stable(struct page *page, int order)
+{
+ int i, rc;
+
for (i = 0; i < (1 << order); i++)
asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
: "=&d" (rc)
- : "a" ((page_to_pfn(page) + i) << PAGE_SHIFT),
+ : "a" (page_to_phys(page + i)),
"i" (ESSA_SET_STABLE));
}
+
+void arch_alloc_page(struct page *page, int order)
+{
+ if (!cmma_flag)
+ return;
+ set_page_stable(page, order);
+}
+
+void arch_set_page_states(int make_stable)
+{
+ unsigned long flags, order, t;
+ struct list_head *l;
+ struct page *page;
+ struct zone *zone;
+
+ if (!cmma_flag)
+ return;
+ if (make_stable)
+ drain_local_pages(NULL);
+ for_each_populated_zone(zone) {
+ spin_lock_irqsave(&zone->lock, flags);
+ for_each_migratetype_order(order, t) {
+ list_for_each(l, &zone->free_area[order].free_list[t]) {
+ page = list_entry(l, struct page, lru);
+ if (make_stable)
+ set_page_stable(page, order);
+ else
+ set_page_unstable(page, order);
+ }
+ }
+ spin_unlock_irqrestore(&zone->lock, flags);
+ }
+}