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Subject[PATCH v1 4/7] 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 | 95 +++++++++++++++++++++++++++++++
1 file changed, 95 insertions(+)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 272ef427dcc0..f68102163bf4 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -895,12 +895,107 @@ static int vfio_ap_mdev_get_device_info(unsigned long arg)
return copy_to_user((void __user *)arg, &info, minsz);
}

+static int ap_ioctl_setirq(struct ap_matrix_mdev *matrix_mdev,
+ struct vfio_ap_aqic *parm)
+{
+ struct aqic_gisa aqic_gisa = reg2aqic(0);
+ struct kvm_s390_gisa *gisa = matrix_mdev->kvm->arch.gisa;
+ struct ap_status ap_status = reg2status(0);
+ unsigned long p;
+ int ret = -1;
+ int apqn;
+ uint32_t gd;
+
+ apqn = (int)(parm->cmd & 0xffff);
+
+ gd = matrix_mdev->kvm->vcpus[0]->arch.sie_block->gd;
+ if (gd & 0x01)
+ aqic_gisa.f = 1;
+ aqic_gisa.gisc = matrix_mdev->gisc;
+ aqic_gisa.isc = GAL_ISC;
+ aqic_gisa.ir = 1;
+ aqic_gisa.gisao = gisa->next_alert >> 4;
+
+ p = (unsigned long) page_address(matrix_mdev->map->page);
+ p += (matrix_mdev->map->guest_addr & 0x0fff);
+
+ ret = ap_host_aqic((uint64_t)apqn, aqic2reg(aqic_gisa), p);
+ parm->status = ret;
+
+ ap_status = reg2status(ret);
+ return (ap_status.rc) ? -EIO : 0;
+}
+
+static int ap_ioctl_clrirq(struct ap_matrix_mdev *matrix_mdev,
+ struct vfio_ap_aqic *parm)
+{
+ struct aqic_gisa aqic_gisa = reg2aqic(0);
+ struct ap_status ap_status = reg2status(0);
+ int apqn;
+ int retval;
+ uint32_t gd;
+
+ apqn = (int)(parm->cmd & 0xffff);
+
+ gd = matrix_mdev->kvm->vcpus[0]->arch.sie_block->gd;
+ if (gd & 0x01)
+ aqic_gisa.f = 1;
+ aqic_gisa.ir = 0;
+
+ retval = ap_host_aqic((uint64_t)apqn, aqic2reg(aqic_gisa), 0);
+ parm->status = retval;
+
+ ap_status = reg2status(retval);
+ return (ap_status.rc) ? -EIO : 0;
+}
+
static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
unsigned int cmd, unsigned long arg)
{
int ret;
+ struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct s390_io_adapter *adapter;
+ struct vfio_ap_aqic parm;
+ struct s390_map_info *map;
+ int apqn, found = 0;

switch (cmd) {
+ case VFIO_AP_SET_IRQ:
+ if (copy_from_user(&parm, (void __user *)arg, sizeof(parm)))
+ return -EFAULT;
+ apqn = (int)(parm.cmd & 0xffff);
+ parm.status &= 0x00000000ffffffffUL;
+ matrix_mdev->gisc = parm.status & 0x07;
+ /* find the adapter */
+ adapter = matrix_mdev->kvm->arch.adapters[parm.adapter_id];
+ if (!adapter)
+ return -ENOENT;
+ 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 -EINVAL;
+
+ matrix_mdev->map = map;
+ ret = ap_ioctl_setirq(matrix_mdev, &parm);
+ parm.status &= 0x00000000ffffffffUL;
+ if (copy_to_user((void __user *)arg, &parm, sizeof(parm)))
+ return -EFAULT;
+
+ break;
+ case VFIO_AP_CLEAR_IRQ:
+ if (copy_from_user(&parm, (void __user *)arg, sizeof(parm)))
+ return -EFAULT;
+ ret = ap_ioctl_clrirq(matrix_mdev, &parm);
+ if (copy_to_user((void __user *)arg, &parm, sizeof(parm)))
+ return -EFAULT;
+ break;
case VFIO_DEVICE_GET_INFO:
ret = vfio_ap_mdev_get_device_info(arg);
break;
--
2.17.0
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