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    Subject[PATCH v12 09/17] s390/vfio-ap: sysfs attribute to display the guest's matrix
    Date
    The matrix of adapters and domains configured in a guest's APCB may
    differ from the matrix of adapters and domains assigned to the matrix mdev,
    so this patch introduces a sysfs attribute to display the matrix of
    adapters and domains that are or will be assigned to the APCB of a guest
    that is or will be using the matrix mdev. For a matrix mdev denoted by
    $uuid, the guest matrix can be displayed as follows:

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

    Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
    ---
    drivers/s390/crypto/vfio_ap_ops.c | 51 ++++++++++++++++++++++---------
    1 file changed, 37 insertions(+), 14 deletions(-)

    diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
    index 89b0e81657ca..a69422d76e7f 100644
    --- a/drivers/s390/crypto/vfio_ap_ops.c
    +++ b/drivers/s390/crypto/vfio_ap_ops.c
    @@ -1075,29 +1075,24 @@ static ssize_t control_domains_show(struct device *dev,
    }
    static DEVICE_ATTR_RO(control_domains);

    -static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
    - char *buf)
    +static ssize_t vfio_ap_mdev_matrix_show(struct ap_matrix *matrix, 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->matrix.apm_max + 1;
    - unsigned long naqm_bits = matrix_mdev->matrix.aqm_max + 1;
    + unsigned long napm_bits = matrix->apm_max + 1;
    + unsigned long naqm_bits = matrix->aqm_max + 1;
    int nchars = 0;
    int n;

    - apid1 = find_first_bit_inv(matrix_mdev->matrix.apm, napm_bits);
    - apqi1 = find_first_bit_inv(matrix_mdev->matrix.aqm, naqm_bits);
    -
    - mutex_lock(&matrix_dev->lock);
    + apid1 = find_first_bit_inv(matrix->apm, napm_bits);
    + apqi1 = find_first_bit_inv(matrix->aqm, naqm_bits);

    if ((apid1 < napm_bits) && (apqi1 < naqm_bits)) {
    - for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
    - for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
    + for_each_set_bit_inv(apid, matrix->apm, napm_bits) {
    + for_each_set_bit_inv(apqi, matrix->aqm,
    naqm_bits) {
    n = sprintf(bufpos, "%02lx.%04lx\n", apid,
    apqi);
    @@ -1106,25 +1101,52 @@ static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
    }
    }
    } else if (apid1 < napm_bits) {
    - for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
    + for_each_set_bit_inv(apid, matrix->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->matrix.aqm, naqm_bits) {
    + for_each_set_bit_inv(apqi, matrix->aqm, naqm_bits) {
    n = sprintf(bufpos, ".%04lx\n", apqi);
    bufpos += n;
    nchars += n;
    }
    }

    + return nchars;
    +}
    +
    +static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
    + char *buf)
    +{
    + ssize_t nchars;
    + struct mdev_device *mdev = mdev_from_dev(dev);
    + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
    +
    + mutex_lock(&matrix_dev->lock);
    + nchars = vfio_ap_mdev_matrix_show(&matrix_mdev->matrix, buf);
    mutex_unlock(&matrix_dev->lock);

    return nchars;
    }
    static DEVICE_ATTR_RO(matrix);

    +static ssize_t guest_matrix_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + ssize_t nchars;
    + struct mdev_device *mdev = mdev_from_dev(dev);
    + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
    +
    + mutex_lock(&matrix_dev->lock);
    + nchars = vfio_ap_mdev_matrix_show(&matrix_mdev->shadow_apcb, buf);
    + 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,
    @@ -1134,6 +1156,7 @@ 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,
    };

    --
    2.21.1
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