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    Subject[RFC 12/19] s390/zcrypt: sysfs support for control domain assignment
    Date
    Provides the sysfs interfaces for assigning an AP control
    domain to and unassigning a control 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_control_domain
    .................. unassign_control_domain
    .................. control_domains

    To assign a control domain to the $uuid mediated matrix device,
    write its domain ID (hex value) to the assign_control_domain file.
    To unassign a control domain, write its domain ID to the
    unassign_control_domain file. To display the list of control
    domains assigned, print the domains file.

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

    echo ff > assign_control_domain

    To see the list of control domains assigned:

    cat control_domains

    To unassign control domain 0xff:

    echo ff > unassign_control_domain

    Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
    ---
    drivers/s390/crypto/vfio_ap_matrix_ops.c | 82 ++++++++++++++++++++++++++++++
    1 files changed, 82 insertions(+), 0 deletions(-)

    diff --git a/drivers/s390/crypto/vfio_ap_matrix_ops.c b/drivers/s390/crypto/vfio_ap_matrix_ops.c
    index 74d7feb..2387916 100644
    --- a/drivers/s390/crypto/vfio_ap_matrix_ops.c
    +++ b/drivers/s390/crypto/vfio_ap_matrix_ops.c
    @@ -469,6 +469,85 @@ static ssize_t ap_matrix_domains_show(struct device *dev,
    static DEVICE_ATTR(domains, 0644, ap_matrix_domains_show,
    NULL);

    +static ssize_t ap_matrix_control_domain_assign(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + int ret;
    + unsigned int id;
    + struct mdev_device *mdev = mdev_from_dev(dev);
    + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
    +
    + ret = ap_matrix_parse_id(buf, &id);
    + if (ret)
    + return ret;
    +
    + set_bit_inv((unsigned long)id,
    + (unsigned long *)matrix_mdev->masks.adm);
    +
    + return count;
    +}
    +static DEVICE_ATTR(assign_control_domain, 0644, NULL,
    + ap_matrix_control_domain_assign);
    +
    +static ssize_t ap_matrix_control_domain_unassign(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + int ret;
    + unsigned int id;
    + struct mdev_device *mdev = mdev_from_dev(dev);
    + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
    +
    + ret = ap_matrix_parse_id(buf, &id);
    + if (ret)
    + return ret;
    +
    + clear_bit_inv((unsigned long)id,
    + (unsigned long *)matrix_mdev->masks.adm);
    +
    + return count;
    +}
    +static DEVICE_ATTR(unassign_control_domain, 0644, NULL,
    + ap_matrix_control_domain_unassign);
    +
    +static ssize_t ap_matrix_control_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 *adm = (unsigned long *)matrix_mdev->masks.adm;
    + unsigned long id;
    + unsigned long nbits = 256;
    + char *bufpos = buf;
    + int nchars = 0;
    + int n;
    +
    + id = find_first_bit_inv(adm, 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(adm, nbits, id + 1);
    + }
    +
    + n = sprintf(bufpos, "\n");
    + bufpos += n;
    + nchars += n;
    +
    + return nchars;
    +}
    +
    +static DEVICE_ATTR(control_domains, 0644, ap_matrix_control_domains_show,
    + NULL);
    +
    static struct attribute *ap_matrix_mdev_attrs[] = {
    &dev_attr_assign_adapter.attr,
    &dev_attr_unassign_adapter.attr,
    @@ -476,6 +555,9 @@ static DEVICE_ATTR(domains, 0644, ap_matrix_domains_show,
    &dev_attr_assign_domain.attr,
    &dev_attr_unassign_domain.attr,
    &dev_attr_domains.attr,
    + &dev_attr_assign_control_domain.attr,
    + &dev_attr_unassign_control_domain.attr,
    + &dev_attr_control_domains.attr,
    NULL
    };

    --
    1.7.1
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