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Subject[PATCH v1 6/7] vfio: ap: register guest ISC with GISA and GIB
Date
Register to the GIB Alert list and retrieve the GAL_ISC
to pass to the GISA registration.

Unregister on error and when clearing the interrupt.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Michael Mueller <mimu@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_ops.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index f68102163bf4..232168797fb8 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -903,16 +903,20 @@ static int ap_ioctl_setirq(struct ap_matrix_mdev *matrix_mdev,
struct ap_status ap_status = reg2status(0);
unsigned long p;
int ret = -1;
- int apqn;
+ int apqn, gal_isc;
uint32_t gd;

+ gal_isc = kvm_s390_gisc_register(matrix_mdev->kvm, matrix_mdev->gisc);
+ if (gal_isc < 0)
+ return -EIO;
+
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.isc = gal_isc;
aqic_gisa.ir = 1;
aqic_gisa.gisao = gisa->next_alert >> 4;

@@ -923,7 +927,11 @@ static int ap_ioctl_setirq(struct ap_matrix_mdev *matrix_mdev,
parm->status = ret;

ap_status = reg2status(ret);
- return (ap_status.rc) ? -EIO : 0;
+ if (ap_status.rc) {
+ kvm_s390_gisc_unregister(matrix_mdev->kvm, matrix_mdev->gisc);
+ return -EIO;
+ }
+ return 0;
}

static int ap_ioctl_clrirq(struct ap_matrix_mdev *matrix_mdev,
@@ -946,6 +954,8 @@ static int ap_ioctl_clrirq(struct ap_matrix_mdev *matrix_mdev,
parm->status = retval;

ap_status = reg2status(retval);
+ /* unregister the IAM from the GIB anyway! */
+ kvm_s390_gisc_unregister(matrix_mdev->kvm, matrix_mdev->gisc);
return (ap_status.rc) ? -EIO : 0;
}

--
2.17.0
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