• C
    s390/mm: fix CMMA vs KSM vs others · a8f60d1f
    Christian Borntraeger 提交于
    On heavy paging with KSM I see guest data corruption. Turns out that
    KSM will add pages to its tree, where the mapping return true for
    pte_unused (or might become as such later).  KSM will unmap such pages
    and reinstantiate with different attributes (e.g. write protected or
    special, e.g. in replace_page or write_protect_page)). This uncovered
    a bug in our pagetable handling: We must remove the unused flag as
    soon as an entry becomes present again.
    
    Cc: stable@vger.kernel.org
    Signed-of-by: NChristian Borntraeger <borntraeger@de.ibm.com>
    Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
    a8f60d1f
pgtable.h 44.1 KB