1.. SPDX-License-Identifier: GPL-2.0 2 3=================== 4VFIO virtual device 5=================== 6 7Device types supported: 8 9 - KVM_DEV_TYPE_VFIO 10 11Only one VFIO instance may be created per VM. The created device 12tracks VFIO groups in use by the VM and features of those groups 13important to the correctness and acceleration of the VM. As groups 14are enabled and disabled for use by the VM, KVM should be updated 15about their presence. When registered with KVM, a reference to the 16VFIO-group is held by KVM. 17 18Groups: 19 KVM_DEV_VFIO_GROUP 20 21KVM_DEV_VFIO_GROUP attributes: 22 KVM_DEV_VFIO_GROUP_ADD: Add a VFIO group to VFIO-KVM device tracking 23 kvm_device_attr.addr points to an int32_t file descriptor 24 for the VFIO group. 25 KVM_DEV_VFIO_GROUP_DEL: Remove a VFIO group from VFIO-KVM device tracking 26 kvm_device_attr.addr points to an int32_t file descriptor 27 for the VFIO group. 28 KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: attaches a guest visible TCE table 29 allocated by sPAPR KVM. 30 kvm_device_attr.addr points to a struct:: 31 32 struct kvm_vfio_spapr_tce { 33 __s32 groupfd; 34 __s32 tablefd; 35 }; 36 37 where: 38 39 - @groupfd is a file descriptor for a VFIO group; 40 - @tablefd is a file descriptor for a TCE table allocated via 41 KVM_CREATE_SPAPR_TCE. 42