On 03/12/2018 11:04, Cornelia Huck wrote:
On Thu, 22 Nov 2018 18:11:15 +0100
Pierre Morel <pmo...@linux.ibm.com> wrote:
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 <pmo...@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_ops.c | 110 +++++++++++++++++++++++++++++++++++++-
1 file changed, 109 insertions(+), 1 deletion(-)
+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);
Oh, and as I just looked at the callers of these functions: You'll want
to check the return code here, even though the function should not fail
with the checking you did beforehand.
I should check.
[I assume you'll have similar code even when using a different
interface.]
Yes.
+ 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);
Here, you don't seem to verify the sanity of parm.isc beforehand...
luckily the function can deal with that :)
You are right.
Anyway I will change this, because this relies on user's code which is
not right.
+
+ if (copy_to_user((void __user *)arg, &parm, sizeof(parm)))
+ return -EFAULT;
+
+ return (ap_status.response_code) ? -EIO : 0;
+}
+
--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany
