@@ -17,6 +17,7 @@
#define KVM_AP_MASK_BYTES(n) DIV_ROUND_UP(n, BITS_PER_BYTE)
#define KVM_AP_MAX_APM_INDEX(matrix) (matrix->apm_max - 1)
#define KVM_AP_MAX_AQM_INDEX(matrix) (matrix->aqm_max - 1)
+#define KVM_AP_MAX_ADM_INDEX(matrix) (matrix->adm_max - 1)
/**
* The AP matrix is comprised of three bit masks identifying the adapters,
@@ -588,11 +588,118 @@ static ssize_t unassign_domain_store(struct device *dev,
}
DEVICE_ATTR_WO(unassign_domain);
+
+/**
+ * assign_control_domain_store
+ *
+ * @dev: the matrix device
+ * @attr: a mediated matrix device attribute
+ * @buf: a buffer containing the adapter ID (APID) to be assigned
+ * @count: the number of bytes in @buf
+ *
+ * Parses the domain ID from @buf and assigns it to the mediated matrix device.
+ *
+ * Returns the number of bytes processed if the domain ID is valid; otherwise
+ * returns an error.
+ */
+static ssize_t assign_control_domain_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ unsigned long id;
+ struct mdev_device *mdev = mdev_from_dev(dev);
+ struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ int maxid = KVM_AP_MAX_ADM_INDEX(matrix_mdev->matrix);
+
+ ret = kstrtoul(buf, 0, &id);
+ if (ret || (id > maxid)) {
+ pr_err("%s: control domain id '%s' not a value from 0 to %02d(%#04x)",
+ VFIO_AP_MATRIX_MODULE_NAME, buf, maxid, maxid);
+
+ return ret ? ret : -EINVAL;
+ }
+
+ /* Set the bit in the ADM (bitmask) corresponding to the AP control
+ * domain number (id). The bits in the mask, from most significant to
+ * least significant, correspond to IDs 0 up to the one less than the
+ * number of control domains that can be assigned.
+ */
+ set_bit_inv(id, matrix_mdev->matrix->adm);
+
+ return count;
+}
+DEVICE_ATTR_WO(assign_control_domain);
+
+/**
+ * unassign_control_domain_store
+ *
+ * @dev: the matrix device
+ * @attr: a mediated matrix device attribute
+ * @buf: a buffer containing the adapter ID (APID) to be assigned
+ * @count: the number of bytes in @buf
+ *
+ * Parses the domain ID from @buf and unassigns it from the mediated matrix
+ * device.
+ *
+ * Returns the number of bytes processed if the domain ID is valid; otherwise
+ * returns an error.
+ */
+static ssize_t unassign_control_domain_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ unsigned long apqi;
+ struct mdev_device *mdev = mdev_from_dev(dev);
+ struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ int maxid = KVM_AP_MAX_ADM_INDEX(matrix_mdev->matrix);
+
+ ret = kstrtoul(buf, 0, &apqi);
+ if (ret || (apqi > maxid)) {
+ pr_err("%s: control domain id '%s' not a value from 0 to %02d(%#04x)",
+ VFIO_AP_MATRIX_MODULE_NAME, buf, maxid, maxid);
+
+ return ret ? ret : -EINVAL;
+ }
+
+ clear_bit_inv((unsigned long)apqi,
+ (unsigned long *)matrix_mdev->matrix->adm);
+
+ return count;
+}
+DEVICE_ATTR_WO(unassign_control_domain);
+
+static ssize_t control_domains_show(struct device *dev,
+ struct device_attribute *dev_attr,
+ char *buf)
+{
+ unsigned long id;
+ int nchars = 0;
+ int n;
+ char *bufpos = buf;
+ struct mdev_device *mdev = mdev_from_dev(dev);
+ struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+
+ for_each_set_bit_inv(id, matrix_mdev->matrix->adm,
+ matrix_mdev->matrix->adm_max) {
+ n = sprintf(bufpos, "%04lx\n", id);
+ bufpos += n;
+ nchars += n;
+ }
+
+ return nchars;
+}
+DEVICE_ATTR_RO(control_domains);
+
static struct attribute *vfio_ap_mdev_attrs[] = {
&dev_attr_assign_adapter.attr,
&dev_attr_unassign_adapter.attr,
&dev_attr_assign_domain.attr,
&dev_attr_unassign_domain.attr,
+ &dev_attr_assign_control_domain.attr,
+ &dev_attr_unassign_control_domain.attr,
+ &dev_attr_control_domains.attr,
NULL,
};
Provides the sysfs interfaces for assigning AP control domains to and unassigning AP control domains from a mediated matrix device. The IDs of the AP control domains assigned to the mediated matrix device are stored in an AP domain mask (ADM). The bits in the ADM, from most significant to least significant bit, correspond to AP domain numbers 0 to 255. When a control domain is assigned, the bit corresponding its domain ID will be set in the ADM. Likewise, when a domain is unassigned, the bit corresponding to its domain ID will be cleared in the ADM. The relevant sysfs structures are: /sys/devices/vfio_ap ... [matrix] ...... [mdev_supported_types] ......... [vfio_ap-passthrough] ............ [devices] ...............[$uuid] .................. assign_control_domain .................. unassign_control_domain To assign a control domain to the $uuid mediated matrix device's ADM, write its domain number to the assign_control_domain file. To unassign a domain, write its domain number to the unassign_control_domain file. The domain number is specified using conventional semantics: If it begins with 0x the number will be parsed as a hexadecimal (case insensitive) number; otherwise, it will be parsed as a decimal number. For example, to assign control domain 173 (0xad) to the mediated matrix device $uuid: echo 173 > assign_control_domain or echo 0xad > assign_control_domain To unassign control domain 173 (0xad): echo 173 > unassign_control_domain or echo 0xad > unassign_control_domain The assignment will be rejected if the APQI exceeds the maximum value for an AP domain: * If the AP Extended Addressing (APXA) facility is installed, the max value is 255 * Else the max value is 15 Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com> --- arch/s390/include/asm/kvm-ap.h | 1 + drivers/s390/crypto/vfio_ap_ops.c | 107 +++++++++++++++++++++++++++++++++++++ 2 files changed, 108 insertions(+), 0 deletions(-)