This is a note to let you know that I've just added the patch titled
KVM: s390/mm: Properly reset no-dat
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-s390-mm-properly-reset-no-dat.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 27072b8e18a73ffeffb1c140939023915a35134b Mon Sep 17 00:00:00 2001
From: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Date: Thu, 9 Nov 2023 13:36:24 +0100
Subject: KVM: s390/mm: Properly reset no-dat
From: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Reviewed-by: Nico Boehr <nrb@xxxxxxxxxxxxx>
Message-ID: <20231109123624.37314-1-imbrenda@xxxxxxxxxxxxx>
Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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();
}
Patches currently in stable-queue which might be from imbrenda@xxxxxxxxxxxxx are
queue-5.4/kvm-s390-mm-properly-reset-no-dat.patch
