This is a note to let you know that I've just added the patch titled
s390/vfio-ap: loop over the shadow APCB when filtering guest's AP configuration
to the 6.1-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:
s390-vfio-ap-loop-over-the-shadow-apcb-when-filtering-guest-s-ap-configuration.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 16fb78cbf56e42b8efb2682a4444ab59e32e7959 Mon Sep 17 00:00:00 2001
From: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
Date: Mon, 15 Jan 2024 13:54:32 -0500
Subject: s390/vfio-ap: loop over the shadow APCB when filtering guest's AP configuration
From: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
commit 16fb78cbf56e42b8efb2682a4444ab59e32e7959 upstream.
While filtering the mdev matrix, it doesn't make sense - and will have
unexpected results - to filter an APID from the matrix if the APID or one
of the associated APQIs is not in the host's AP configuration. There are
two reasons for this:
1. An adapter or domain that is not in the host's AP configuration can be
assigned to the matrix; this is known as over-provisioning. Queue
devices, however, are only created for adapters and domains in the
host's AP configuration, so there will be no queues associated with an
over-provisioned adapter or domain to filter.
2. The adapter or domain may have been externally removed from the host's
configuration via an SE or HMC attached to a DPM enabled LPAR. In this
case, the vfio_ap device driver would have been notified by the AP bus
via the on_config_changed callback and the adapter or domain would
have already been filtered.
Since the matrix_mdev->shadow_apcb.apm and matrix_mdev->shadow_apcb.aqm are
copied from the mdev matrix sans the APIDs and APQIs not in the host's AP
configuration, let's loop over those bitmaps instead of those assigned to
the matrix.
Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
Reviewed-by: Halil Pasic <pasic@xxxxxxxxxxxxx>
Fixes: 48cae940c31d ("s390/vfio-ap: refresh guest's APCB by filtering AP resources assigned to mdev")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20240115185441.31526-3-akrowiak@xxxxxxxxxxxxx
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/s390/crypto/vfio_ap_ops.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -660,8 +660,9 @@ static bool vfio_ap_mdev_filter_matrix(s
bitmap_and(matrix_mdev->shadow_apcb.aqm, matrix_mdev->matrix.aqm,
(unsigned long *)matrix_dev->info.aqm, AP_DOMAINS);
- for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, AP_DEVICES) {
- for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, AP_DOMAINS) {
+ for_each_set_bit_inv(apid, matrix_mdev->shadow_apcb.apm, AP_DEVICES) {
+ for_each_set_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm,
+ AP_DOMAINS) {
/*
* If the APQN is not bound to the vfio_ap device
* driver, then we can't assign it to the guest's
Patches currently in stable-queue which might be from akrowiak@xxxxxxxxxxxxx are
queue-6.1/s390-vfio-ap-loop-over-the-shadow-apcb-when-filtering-guest-s-ap-configuration.patch
queue-6.1/s390-vfio-ap-let-on_scan_complete-callback-filter-matrix-and-update-guest-s-apcb.patch
queue-6.1/s390-vfio-ap-always-filter-entire-ap-matrix.patch
queue-6.1/s390-vfio-ap-unpin-pages-on-gisc-registration-failure.patch
