Re: [PATCH v6 13/21] s390: vfio-ap: sysfs interface to view matrix mdev matrix

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On 29/06/2018 23:11, Tony Krowiak wrote:
Provides a sysfs interface to view the AP matrix configured for the
mediated matrix device.

The relevant sysfs structures are:

/sys/devices/vfio_ap
... [matrix]
...... [mdev_supported_types]
......... [vfio_ap-passthrough]
............ [devices]
...............[$uuid]
.................. matrix

To view the matrix configured for the mediated matrix device,
print the matrix file:

	cat matrix

Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
---
  drivers/s390/crypto/vfio_ap_ops.c |   31 +++++++++++++++++++++++++++++++
  1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index c8f31f3..bc7398d 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -697,6 +697,36 @@ static ssize_t control_domains_show(struct device *dev,
  }
  DEVICE_ATTR_RO(control_domains);

+static ssize_t 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 napm = matrix_mdev->matrix.apm_max + 1;
+	unsigned long naqm = matrix_mdev->matrix.aqm_max + 1;
+	int nchars = 0;
+	int n;
+
+	for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm) {
+		n = sprintf(bufpos, "%02lx\n", apid);
+		bufpos += n;
+		nchars += n;
+
+		for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, naqm) {
+			n = sprintf(bufpos, "%02lx.%04lx\n", apid, apqi);
+			bufpos += n;
+			nchars += n;
+		}
+	}
+
+	return nchars;
+}
+DEVICE_ATTR_RO(matrix);
+
+
  static struct attribute *vfio_ap_mdev_attrs[] = {
  	&dev_attr_assign_adapter.attr,
  	&dev_attr_unassign_adapter.attr,
@@ -705,6 +735,7 @@ static ssize_t control_domains_show(struct device *dev,
  	&dev_attr_assign_control_domain.attr,
  	&dev_attr_unassign_control_domain.attr,
  	&dev_attr_control_domains.attr,
+	&dev_attr_matrix.attr,
  	NULL,
  };


I have still the same remark: what you show here is not what is currently
used by the SIE.
It is not irrelevant but what the guest really use may be more interesting
for the admin.


--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany

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