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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-08-28 23:44:57 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-09-02 10:30:43 +0200 |
| commit | 1951497d90d6754201af3e65241a06f9ef6755cd (patch) | |
| tree | 611b12ed59c3f42b71ebe8d348705082076b51de | |
| parent | KVM: s390/mm: Fix storage key corruption during swapping (diff) | |
| download | linux-1951497d90d6754201af3e65241a06f9ef6755cd.tar.xz linux-1951497d90d6754201af3e65241a06f9ef6755cd.zip | |
KVM: s390/mm: Fix guest storage key corruption in ptep_set_access_flags
commit 0944fe3f4a32 ("s390/mm: implement software referenced bits")
triggered another paging/storage key corruption. There is an
unhandled invalid->valid pte change where we have to set the real
storage key from the pgste.
When doing paging a guest page might be swapcache or swap and when
faulted in it might be read-only and due to a parallel scan old.
An do_wp_page will make it writeable and young. Due to software
reference tracking this page was invalid and now becomes valid.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: stable@vger.kernel.org # v3.12+
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 32686e891313..5efb2fe186e7 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1331,6 +1331,7 @@ static inline int ptep_set_access_flags(struct vm_area_struct *vma, ptep_flush_direct(vma->vm_mm, address, ptep); if (mm_has_pgste(vma->vm_mm)) { + pgste_set_key(ptep, pgste, entry, vma->vm_mm); pgste = pgste_set_pte(ptep, pgste, entry); pgste_set_unlock(ptep, pgste); } else |