summaryrefslogtreecommitdiffstats
path: root/arch/s390/mm
diff options
context:
space:
mode:
authorMartin Schwidefsky <schwidefsky@de.ibm.com>2013-05-21 17:29:52 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-02-21 08:50:20 +0100
commitdeedabb2b4a68a63351a949b1abcf73fc97eb406 (patch)
tree1ecb9504a61ef30a74a9ac268e5b32719ac57f91 /arch/s390/mm
parentb31288fa83b2bcc8834e1e208e9526b8bd5ce361 (diff)
downloadop-kernel-dev-deedabb2b4a68a63351a949b1abcf73fc97eb406.zip
op-kernel-dev-deedabb2b4a68a63351a949b1abcf73fc97eb406.tar.gz
s390/kvm: set guest page states to stable on re-ipl
The guest page state needs to be reset to stable for all pages on initial program load via diagnose 0x308. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/pgtable.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 9e2b470..9c26b7a 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -879,6 +879,78 @@ static inline void page_table_free_pgste(unsigned long *table)
__free_page(page);
}
+static inline unsigned long page_table_reset_pte(struct mm_struct *mm,
+ pmd_t *pmd, unsigned long addr, unsigned long end)
+{
+ pte_t *start_pte, *pte;
+ spinlock_t *ptl;
+ pgste_t pgste;
+
+ start_pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
+ pte = start_pte;
+ do {
+ pgste = pgste_get_lock(pte);
+ pgste_val(pgste) &= ~_PGSTE_GPS_USAGE_MASK;
+ pgste_set_unlock(pte, pgste);
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+ pte_unmap_unlock(start_pte, ptl);
+
+ return addr;
+}
+
+static inline unsigned long page_table_reset_pmd(struct mm_struct *mm,
+ pud_t *pud, unsigned long addr, unsigned long end)
+{
+ unsigned long next;
+ pmd_t *pmd;
+
+ pmd = pmd_offset(pud, addr);
+ do {
+ next = pmd_addr_end(addr, end);
+ if (pmd_none_or_clear_bad(pmd))
+ continue;
+ next = page_table_reset_pte(mm, pmd, addr, next);
+ } while (pmd++, addr = next, addr != end);
+
+ return addr;
+}
+
+static inline unsigned long page_table_reset_pud(struct mm_struct *mm,
+ pgd_t *pgd, unsigned long addr, unsigned long end)
+{
+ unsigned long next;
+ pud_t *pud;
+
+ pud = pud_offset(pgd, addr);
+ do {
+ next = pud_addr_end(addr, end);
+ if (pud_none_or_clear_bad(pud))
+ continue;
+ next = page_table_reset_pmd(mm, pud, addr, next);
+ } while (pud++, addr = next, addr != end);
+
+ return addr;
+}
+
+void page_table_reset_pgste(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
+{
+ unsigned long addr, next;
+ pgd_t *pgd;
+
+ addr = start;
+ down_read(&mm->mmap_sem);
+ pgd = pgd_offset(mm, addr);
+ do {
+ next = pgd_addr_end(addr, end);
+ if (pgd_none_or_clear_bad(pgd))
+ continue;
+ next = page_table_reset_pud(mm, pgd, addr, next);
+ } while (pgd++, addr = next, addr != end);
+ up_read(&mm->mmap_sem);
+}
+EXPORT_SYMBOL(page_table_reset_pgste);
+
int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
unsigned long key, bool nq)
{
OpenPOWER on IntegriCloud