Re: [PATCH v2 13/15] KVM: s390: Configure the guest's CRYCB

From: Tony Krowiak
Date: Wed Feb 28 2018 - 15:46:15 EST


On 02/28/2018 04:49 AM, David Hildenbrand wrote:
+static int vfio_ap_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 = vfio_ap_mdev_group_notifier;
+ events = VFIO_GROUP_NOTIFY_SET_KVM;
+ ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
+ &events, &matrix_mdev->group_notifier);
+
+ ret = kvm_ap_configure_matrix(matrix_mdev->kvm,
+ matrix_mdev->matrix);
+ if (ret)
+ return ret;
+
+ ret = kvm_ap_enable_ie_mode(matrix_mdev->kvm);
Can't this happen while the guest is already running? Or what hinders us
from doing that?
I'm not sure exactly what you're asking here. Are you asking if the vfio_ap_mdev_open()
function can be called multiple times while the guest is running? AFAIK this will be
called only once when the mediated device's file descriptor is opened. This happens in
QEMU when the -device vfio-ap device is realized.


+
+ return ret;
+}
+
+static void vfio_ap_mdev_release(struct mdev_device *mdev)
Thanks,

David / dhildenb