Messages in this thread | | | Subject | Re: [PATCH v6 13/21] s390: vfio-ap: sysfs interface to view matrix mdev matrix | From | Tony Krowiak <> | Date | Fri, 13 Jul 2018 14:24:47 +0200 |
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On 07/09/2018 04:38 PM, Pierre Morel wrote: > On 09/07/2018 14:20, Pierre Morel wrote: >> 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@linux.ibm.com> >>> --- >>> 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. >> >> > OK, you implement the right view it in patch 16/21. > > Still, what is the purpose of showing this view?
I find it to have great value when configuring the mdev. It provides a view of what has been configured thus far.
> > >
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