Registers a group notifier during the open of the mediated device to get information on KVM presence through the VFIO_GROUP_NOTIFY_SET_KVM event. When notified, save the pointer to KVM inside mediated matrix device structure. Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxxxxxxx> --- drivers/s390/crypto/vfio_ap_matrix_ops.c | 43 ++++++++++++++++++++++++++++++ 1 files changed, 43 insertions(+), 0 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_matrix_ops.c b/drivers/s390/crypto/vfio_ap_matrix_ops.c index 10a006c..fd36074 100644 --- a/drivers/s390/crypto/vfio_ap_matrix_ops.c +++ b/drivers/s390/crypto/vfio_ap_matrix_ops.c @@ -12,6 +12,9 @@ #include <linux/device.h> #include <linux/list.h> #include <linux/ctype.h> +#include <linux/kvm_host.h> +#include <linux/eventfd.h> +#include <linux/notifier.h> #include "vfio_ap_matrix_private.h" @@ -24,6 +27,8 @@ struct ap_matrix_mdev { struct mdev_device *mdev; struct list_head node; struct ap_config_masks masks; + struct notifier_block group_notifier; + struct kvm *kvm; }; struct ap_matrix *matrix; @@ -97,6 +102,41 @@ static int ap_matrix_mdev_remove(struct mdev_device *mdev) return 0; } +static int ap_matrix_mdev_group_notifier(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct ap_matrix_mdev *matrix_mdev; + + matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier); + + if (action == VFIO_GROUP_NOTIFY_SET_KVM) + matrix_mdev->kvm = data; + + return NOTIFY_OK; +} + +static int ap_matrix_mdev_open(struct mdev_device *mdev) +{ + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); + unsigned long events; + int ret; + + matrix_mdev->group_notifier.notifier_call = + ap_matrix_mdev_group_notifier; + events = VFIO_GROUP_NOTIFY_SET_KVM; + ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, + &events, &matrix_mdev->group_notifier); + return ret; +} + +static void ap_matrix_mdev_release(struct mdev_device *mdev) +{ + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); + + vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, + &matrix_mdev->group_notifier); +} + static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf) { return sprintf(buf, "%s\n", AP_MATRIX_MDEV_NAME_HWVIRT); @@ -609,6 +649,9 @@ static DEVICE_ATTR(control_domains, 0644, ap_matrix_control_domains_show, .mdev_attr_groups = ap_matrix_mdev_attr_groups, .create = ap_matrix_mdev_create, .remove = ap_matrix_mdev_remove, + .open = ap_matrix_mdev_open, + .release = ap_matrix_mdev_release, + }; int ap_matrix_mdev_register(struct ap_matrix *ap_matrix) -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html