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From: Tony Krowiak <akrowiak@linux.ibm.com>
To: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Cc: freude@linux.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com,
	mjrosato@linux.ibm.com, pmorel@linux.ibm.com,
	pasic@linux.ibm.com, alex.williamson@redhat.com,
	kwankhede@nvidia.com, jjherne@linux.ibm.com,
	Tony Krowiak <akrowiak@linux.ibm.com>
Subject: [PATCH v6 05/10] s390: vfio-ap: sysfs attribute to display the guest CRYCB
Date: Fri, 13 Sep 2019 17:26:53 -0400
Message-ID: <1568410018-10833-6-git-send-email-akrowiak@linux.ibm.com> (raw)
In-Reply-To: <1568410018-10833-1-git-send-email-akrowiak@linux.ibm.com>

The matrix of adapters and domains configured in a guest's CRYCB may
differ from the matrix of adapters and domains assigned to the matrix mdev,
so this patch introduces a sysfs attribute to display the CRYCB of a guest
using the matrix mdev. For a matrix mdev denoted by $uuid, the crycb for a
guest using the matrix mdev can be displayed as follows:

   cat /sys/devices/vfio_ap/matrix/$uuid/guest_matrix

If a guest is not using the matrix mdev at the time the crycb is dispalyed
an error (ENODEV) will be returned.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
---
 drivers/s390/crypto/vfio_ap_ops.c | 54 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index fec07f912916..14f221b7426b 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -930,6 +930,59 @@ static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_RO(matrix);
 
+static ssize_t guest_matrix_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct mdev_device *mdev = mdev_from_dev(dev);
+	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	char *bufpos = buf;
+	unsigned long apid;
+	unsigned long apqi;
+	unsigned long apid1;
+	unsigned long apqi1;
+	unsigned long napm_bits = matrix_mdev->crycb.apm_max + 1;
+	unsigned long naqm_bits = matrix_mdev->crycb.aqm_max + 1;
+	int nchars = 0;
+	int n;
+
+	if (!vfio_ap_mdev_has_crycb(matrix_mdev))
+		return -ENODEV;
+
+	apid1 = find_first_bit_inv(matrix_mdev->crycb.apm, napm_bits);
+	apqi1 = find_first_bit_inv(matrix_mdev->crycb.aqm, naqm_bits);
+
+	mutex_lock(&matrix_dev->lock);
+
+	if ((apid1 < napm_bits) && (apqi1 < naqm_bits)) {
+		for_each_set_bit_inv(apid, matrix_mdev->crycb.apm, napm_bits) {
+			for_each_set_bit_inv(apqi, matrix_mdev->crycb.aqm,
+					     naqm_bits) {
+				n = sprintf(bufpos, "%02lx.%04lx\n", apid,
+					    apqi);
+				bufpos += n;
+				nchars += n;
+			}
+		}
+	} else if (apid1 < napm_bits) {
+		for_each_set_bit_inv(apid, matrix_mdev->crycb.apm, napm_bits) {
+			n = sprintf(bufpos, "%02lx.\n", apid);
+			bufpos += n;
+			nchars += n;
+		}
+	} else if (apqi1 < naqm_bits) {
+		for_each_set_bit_inv(apqi, matrix_mdev->crycb.aqm, naqm_bits) {
+			n = sprintf(bufpos, ".%04lx\n", apqi);
+			bufpos += n;
+			nchars += n;
+		}
+	}
+
+	mutex_unlock(&matrix_dev->lock);
+
+	return nchars;
+}
+static DEVICE_ATTR_RO(guest_matrix);
+
 static struct attribute *vfio_ap_mdev_attrs[] = {
 	&dev_attr_assign_adapter.attr,
 	&dev_attr_unassign_adapter.attr,
@@ -939,6 +992,7 @@ static struct attribute *vfio_ap_mdev_attrs[] = {
 	&dev_attr_unassign_control_domain.attr,
 	&dev_attr_control_domains.attr,
 	&dev_attr_matrix.attr,
+	&dev_attr_guest_matrix.attr,
 	NULL,
 };
 
-- 
2.7.4


  parent reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-13 21:26 [PATCH v6 00/10] s390: vfio-ap: dynamic configuration support Tony Krowiak
2019-09-13 21:26 ` [PATCH v6 01/10] s390: vfio-ap: Refactor vfio_ap driver probe and remove callbacks Tony Krowiak
2019-09-13 21:26 ` [PATCH v6 02/10] s390: vfio-ap: allow assignment of unavailable AP resources to mdev device Tony Krowiak
2019-09-13 21:26 ` [PATCH v6 03/10] s390: vfio-ap: allow hot plug/unplug of AP resources using " Tony Krowiak
2019-09-13 21:26 ` [PATCH v6 04/10] s390: vfio-ap: filter CRYCB bits for unavailable queue devices Tony Krowiak
2019-09-18 17:04   ` Halil Pasic
2019-09-18 21:22     ` Tony Krowiak
2019-09-19 10:34   ` Halil Pasic
2019-09-20 14:24     ` Tony Krowiak
2019-09-20 15:44       ` Tony Krowiak
2019-09-13 21:26 ` Tony Krowiak [this message]
2019-09-13 21:26 ` [PATCH v6 06/10] s390: vfio-ap: update guest CRYCB in vfio_ap probe and remove callbacks Tony Krowiak
2019-09-13 21:26 ` [PATCH v6 07/10] s390: zcrypt: driver callback to indicate resource in use Tony Krowiak
2019-09-13 21:26 ` [PATCH v6 08/10] s390: vfio-ap: implement in-use callback for vfio_ap driver Tony Krowiak
2019-09-13 21:26 ` [PATCH v6 09/10] s390: vfio-ap: added versioning to vfio_ap module Tony Krowiak
2019-09-13 21:26 ` [PATCH v6 10/10] s390: vfio-ap: update documentation Tony Krowiak

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