Messages in this thread | | | Subject | Re: [PATCH v5 10/13] s390: vfio-ap: sysfs interface to view matrix mdev matrix | From | Pierre Morel <> | Date | Wed, 16 May 2018 09:55:27 +0200 |
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On 07/05/2018 17:11, 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:
This is the configured matrix, not the one used by the guest. Nothing in the patches protect against binding a queue and assigning a new AP when the guest runs. The card and queue will be showed by this entry.
> > cat matrix > > Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.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 755be1d..81e03b8 100644 > --- a/drivers/s390/crypto/vfio_ap_ops.c > +++ b/drivers/s390/crypto/vfio_ap_ops.c > @@ -716,6 +716,36 @@ 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, > @@ -724,6 +754,7 @@ 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, > }; >
-- Pierre Morel Linux/KVM/QEMU in Böblingen - Germany
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