4.19-stable review patch. If anyone has any objections, please let me know.
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From: Claudio Imbrenda imbrenda@linux.ibm.com
commit 27072b8e18a73ffeffb1c140939023915a35134b upstream.
When the CMMA state needs to be reset, the no-dat bit also needs to be reset. Failure to do so could cause issues in the guest, since the guest expects the bit to be cleared after a reset.
Cc: stable@vger.kernel.org Reviewed-by: Nico Boehr nrb@linux.ibm.com Message-ID: 20231109123624.37314-1-imbrenda@linux.ibm.com Signed-off-by: Claudio Imbrenda imbrenda@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/s390/mm/pgtable.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -699,7 +699,7 @@ void ptep_zap_unused(struct mm_struct *m pte_clear(mm, addr, ptep); } if (reset) - pgste_val(pgste) &= ~_PGSTE_GPS_USAGE_MASK; + pgste_val(pgste) &= ~(_PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT); pgste_set_unlock(ptep, pgste); preempt_enable(); }