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Subject[PATCH v2 3/3] vfio: ap: AP Queue Interrupt Control VFIO ioctl calls
Date
This is the implementation of the VFIO ioctl calls to handle
the AQIC interception and use GISA to handle interrupts.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_ops.c | 110 +++++++++++++++++++++++++++++++++++++-
1 file changed, 109 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 272ef42..f6e942f 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -895,12 +895,121 @@ static int vfio_ap_mdev_get_device_info(unsigned long arg)
return copy_to_user((void __user *)arg, &info, minsz);
}

+static unsigned long vfio_ap_get_nib(struct kvm *kvm, struct vfio_ap_aqic *parm)
+{
+ struct s390_io_adapter *adapter;
+ struct s390_map_info *map;
+ unsigned long nib;
+ int found = 0;
+
+ /* find the adapter */
+ if (parm->adapter_id > MAX_S390_IO_ADAPTERS)
+ return 0;
+
+ adapter = kvm->arch.adapters[parm->adapter_id];
+ if (!adapter)
+ return 0;
+
+ down_write(&adapter->maps_lock);
+ list_for_each_entry(map, &adapter->maps, list) {
+ if (map->guest_addr == parm->nib) {
+ found = 1;
+ break;
+ }
+ }
+ up_write(&adapter->maps_lock);
+
+ if (!found)
+ return 0;
+
+ nib = (unsigned long) page_address(map->page);
+ nib += (map->guest_addr & 0x0fff);
+
+ return nib;
+}
+
+static int vfio_ap_ioctl_setirq(struct mdev_device *mdev, unsigned long arg)
+{
+ struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct vfio_ap_aqic parm;
+ struct ap_qirq_ctrl aqic_gisa = {};
+ struct kvm *kvm = matrix_mdev->kvm;
+ struct kvm_s390_gisa *gisa = kvm->arch.gisa;
+ struct ap_queue_status ap_status;
+ unsigned long nib;
+
+ if (copy_from_user(&parm, (void __user *)arg, sizeof(parm)))
+ return -EFAULT;
+
+ if (parm.isc > MAX_ISC)
+ return -EINVAL;
+
+ if (kvm->vcpus[0]->arch.sie_block->gd & 0x01)
+ aqic_gisa.gf = 1;
+
+ nib = vfio_ap_get_nib(kvm, &parm);
+ if (!nib)
+ return -ENODEV;
+
+ aqic_gisa.gisc = parm.isc;
+ aqic_gisa.isc = kvm_s390_gisc_register(kvm, parm.isc);
+ aqic_gisa.ir = 1;
+ aqic_gisa.gisa = gisa->next_alert >> 4;
+
+ ap_status = ap_aqic(parm.apqn, aqic_gisa, (void *)nib);
+ parm.status = *(uint32_t *)(&ap_status);
+
+ if (copy_to_user((void __user *)arg, &parm, sizeof(parm))) {
+ kvm_s390_gisc_unregister(kvm, parm.isc);
+ return -EFAULT;
+ }
+
+ if (ap_status.response_code) {
+ kvm_s390_gisc_unregister(kvm, parm.isc);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int vfio_ap_ioctl_clrirq(struct mdev_device *mdev, unsigned long arg)
+{
+ struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct vfio_ap_aqic parm;
+ struct ap_qirq_ctrl aqic_gisa = {};
+ struct ap_queue_status ap_status;
+ struct kvm *kvm = matrix_mdev->kvm;
+
+ if (copy_from_user(&parm, (void __user *)arg, sizeof(parm)))
+ return -EFAULT;
+
+ if (kvm->vcpus[0]->arch.sie_block->gd & 0x01)
+ aqic_gisa.gf = 1;
+ aqic_gisa.ir = 0;
+
+ ap_status = ap_aqic(parm.apqn, aqic_gisa, NULL);
+ parm.status = *(uint32_t *)(&ap_status);
+
+ kvm_s390_gisc_unregister(kvm, parm.isc);
+
+ if (copy_to_user((void __user *)arg, &parm, sizeof(parm)))
+ return -EFAULT;
+
+ return (ap_status.response_code) ? -EIO : 0;
+}
+
static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
unsigned int cmd, unsigned long arg)
{
int ret;

switch (cmd) {
+ case VFIO_AP_SET_IRQ:
+ ret = vfio_ap_ioctl_setirq(mdev, arg);
+ break;
+ case VFIO_AP_CLEAR_IRQ:
+ ret = vfio_ap_ioctl_clrirq(mdev, arg);
+ break;
case VFIO_DEVICE_GET_INFO:
ret = vfio_ap_mdev_get_device_info(arg);
break;
@@ -911,7 +1020,6 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
ret = -EOPNOTSUPP;
break;
}
-
return ret;
}

--
2.7.4
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