[qemu-s390x] [RFC 10/19] s390/zcrypt: sysfs interfaces supporting AP domain assignment

[Tony Krowiak]

Provides the sysfs interfaces for assigning an AP usage domain
to and unassigning a usage domain from a mediated matrix device.

The relevant sysfs structures are:

/sys/devices/ap_matrix
... [matrix]
...... [mdev_supported_types]
......... [ap_matrix-passthrough]
............ [devices]
...............[$uuid]
.................. assign_domain
.................. domains
.................. unassign_domain

To assign a domain to the $uuid mediated matrix device, write
its domain ID (hex value) to the assign_domain file. To
unassign a domain, write its domain ID (hex value) to the
unassign_domain file. To view a list of domains which have
been assigned, print the contents of the domains file

For example, to assign domain 0x04 to the $uuid mediated
matrix device:

        echo 4 > assign_domain

To unassign domain 0x04:

        echo 4 > unassign_domain

To see the list of domains assigned:

        cat domains

Signed-off-by: Tony Krowiak <address@hidden>
---
 drivers/s390/crypto/vfio_ap_matrix_ops.c |   80 ++++++++++++++++++++++++++++++
 1 files changed, 80 insertions(+), 0 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_matrix_ops.c 
b/drivers/s390/crypto/vfio_ap_matrix_ops.c
index 2e63d1b..f54285c 100644
--- a/drivers/s390/crypto/vfio_ap_matrix_ops.c
+++ b/drivers/s390/crypto/vfio_ap_matrix_ops.c
@@ -329,10 +329,90 @@ static ssize_t ap_matrix_adapters_show(struct device *dev,
 }
 static DEVICE_ATTR(adapters, 0644, ap_matrix_adapters_show, NULL);
 
+static ssize_t ap_matrix_domain_assign(struct device *dev,
+                                      struct device_attribute *attr,
+                                      const char *buf, size_t count)
+{
+       int ret;
+       unsigned int apqi;
+       struct mdev_device *mdev = mdev_from_dev(dev);
+       struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+
+       ret = ap_matrix_parse_id(buf, &apqi);
+       if (ret)
+               return ret;
+
+       set_bit_inv((unsigned long)apqi,
+                   (unsigned long *)matrix_mdev->masks.aqm);
+
+       return count;
+}
+static DEVICE_ATTR(assign_domain, 0644, NULL, ap_matrix_domain_assign);
+
+static ssize_t ap_matrix_domain_unassign(struct device *dev,
+                                        struct device_attribute *attr,
+                                        const char *buf, size_t count)
+{
+       int ret;
+       unsigned int apqi;
+       struct mdev_device *mdev = mdev_from_dev(dev);
+       struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+
+       ret = ap_matrix_parse_id(buf, &apqi);
+       if (ret)
+               return ret;
+
+       clear_bit_inv((unsigned long)apqi,
+                     (unsigned long *)matrix_mdev->masks.aqm);
+
+       return count;
+}
+static DEVICE_ATTR(unassign_domain, 0644, NULL, ap_matrix_domain_unassign);
+
+static ssize_t ap_matrix_domains_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);
+       unsigned long *aqm = (unsigned long *)matrix_mdev->masks.aqm;
+       unsigned long id;
+       unsigned long nbits = 256;
+       char *bufpos = buf;
+       int nchars = 0;
+       int n;
+
+       id = find_first_bit_inv(aqm, nbits);
+       while (id < nbits) {
+               if (nchars) {
+                       n = sprintf(bufpos, ",");
+                       bufpos += n;
+                       nchars += n;
+               }
+
+               n = sprintf(bufpos, "%04lx", id);
+               bufpos += n;
+               nchars += n;
+               id = find_next_bit_inv(aqm, nbits, id + 1);
+       }
+
+       n = sprintf(bufpos, "\n");
+       bufpos += n;
+       nchars += n;
+
+       return nchars;
+}
+
+static DEVICE_ATTR(domains, 0644, ap_matrix_domains_show,
+                  NULL);
+
 static struct attribute *ap_matrix_mdev_attrs[] = {
        &dev_attr_assign_adapter.attr,
        &dev_attr_unassign_adapter.attr,
        &dev_attr_adapters.attr,
+       &dev_attr_assign_domain.attr,
+       &dev_attr_unassign_domain.attr,
+       &dev_attr_domains.attr,
        NULL
 };
 
-- 
1.7.1