From: Tony Krowiak <akrowiak@linux.ibm.com>
To: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org
Cc: jjherne@linux.ibm.com, borntraeger@de.ibm.com,
pasic@linux.ibm.com, pbonzini@redhat.com, frankja@linux.ibm.com,
imbrenda@linux.ibm.com, alex.williamson@redhat.com,
kwankhede@nvidia.com, stable@vger.kernel.org
Subject: [PATCH v1 2/6] s390/vfio-ap: loop over the shadow APCB when filtering guest's AP configuration
Date: Fri, 8 Dec 2023 11:22:47 -0500 [thread overview]
Message-ID: <20231208162256.10633-3-akrowiak@linux.ibm.com> (raw)
In-Reply-To: <20231208162256.10633-1-akrowiak@linux.ibm.com>
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@linux.ibm.com>
Fixes: 48cae940c31d ("s390/vfio-ap: refresh guest's APCB by filtering AP resources assigned to mdev")
Cc: <stable@vger.kernel.org>
---
drivers/s390/crypto/vfio_ap_ops.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 9382b32e5bd1..47232e19a50e 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -691,8 +691,9 @@ static bool vfio_ap_mdev_filter_matrix(struct ap_matrix_mdev *matrix_mdev)
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
--
2.43.0
next prev parent reply other threads:[~2023-12-08 16:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-08 16:22 [PATCH v1 0/6] s390/vfio-ap: reset queues removed from guest's AP configuration Tony Krowiak
2023-12-08 16:22 ` [PATCH v1 1/6] s390/vfio-ap: always filter entire AP matrix Tony Krowiak
2023-12-08 16:22 ` Tony Krowiak [this message]
2023-12-08 16:22 ` [PATCH v1 3/6] s390/vfio-ap: let 'on_scan_complete' callback filter matrix and update guest's APCB Tony Krowiak
2023-12-08 16:22 ` [PATCH v1 4/6] s390/vfio-ap: reset queues filtered from the guest's AP config Tony Krowiak
2023-12-08 16:22 ` [PATCH v1 5/6] s390/vfio-ap: reset queues associated with adapter for queue unbound from driver Tony Krowiak
2023-12-08 16:22 ` [PATCH v1 6/6] s390/vfio-ap: do not reset queue removed from host config Tony Krowiak
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