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KVM: s390/mm: Properly reset no-dat

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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>
This commit is contained in:
Claudio Imbrenda 2023-11-09 13:36:24 +01:00 committed by Greg Kroah-Hartman
parent 1aee33d43d
commit 77a353924d
1 changed files with 1 additions and 1 deletions
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2
arch/s390/mm/pgtable.c
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@ -699,7 +699,7 @@ void ptep_zap_unused(struct mm_struct *mm, unsigned long addr,
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();
}