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KVM: s390/mm: Fix storage key corruption during swapping 

Since 3.12 or more precisely  commit 0944fe3f4a ("s390/mm:
implement software referenced bits") guest storage keys get
corrupted during paging. This commit added another valid->invalid
translation for page tables - namely ptep_test_and_clear_young.
We have to transfer the storage key into the pgste in that case.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: stable@vger.kernel.org # v3.12+
This commit is contained in:
Christian Borntraeger 2014-08-28 21:21:41 +02:00
parent ab3f285f22
commit 3e03d4c46d
1 changed files with 3 additions and 2 deletions
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5
arch/s390/include/asm/pgtable.h
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@ -1127,7 +1127,7 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
pgste_t pgste;
pte_t pte;
pte_t pte, oldpte;
int young;
if (mm_has_pgste(vma->vm_mm)) {
@ -1135,12 +1135,13 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
pgste = pgste_ipte_notify(vma->vm_mm, ptep, pgste);
}
pte = *ptep;
oldpte = pte = *ptep;
ptep_flush_direct(vma->vm_mm, addr, ptep);
young = pte_young(pte);
pte = pte_mkold(pte);
if (mm_has_pgste(vma->vm_mm)) {
pgste = pgste_update_all(&oldpte, pgste, vma->vm_mm);
pgste = pgste_set_pte(ptep, pgste, pte);
pgste_set_unlock(ptep, pgste);
} else