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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-08-28 21:21:41 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-09-02 10:30:43 +0200 |
| commit | 3e03d4c46daa849880837d802e41c14132a03ef9 (patch) | |
| tree | 758d0d843efe23586a2546ee9edf04e506231c25 /arch/s390 | |
| parent | KVM: s390/mm: try a cow on read only pages for key ops (diff) | |
| download | linux-3e03d4c46daa849880837d802e41c14132a03ef9.tar.xz linux-3e03d4c46daa849880837d802e41c14132a03ef9.zip | |
KVM: s390/mm: Fix storage key corruption during swapping
Since 3.12 or more precisely commit 0944fe3f4a32 ("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+
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index b76317c1f3eb..32686e891313 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -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 |