1 .. SPDX-License-Identifier: GPL-2.0
7 Device types supported:
11 Only one VFIO instance may be created per VM. The created device
12 tracks VFIO files (group or device) in use by the VM and features
13 of those groups/devices important to the correctness and acceleration
14 of the VM. As groups/devices are enabled and disabled for use by the
15 VM, KVM should be updated about their presence. When registered with
16 KVM, a reference to the VFIO file is held by KVM.
20 alias: KVM_DEV_VFIO_GROUP
22 KVM_DEV_VFIO_FILE attributes:
23 KVM_DEV_VFIO_FILE_ADD: Add a VFIO file (group/device) to VFIO-KVM device
26 kvm_device_attr.addr points to an int32_t file descriptor for the
29 KVM_DEV_VFIO_FILE_DEL: Remove a VFIO file (group/device) from VFIO-KVM
32 kvm_device_attr.addr points to an int32_t file descriptor for the
35 KVM_DEV_VFIO_GROUP (legacy kvm device group restricted to the handling of VFIO group fd):
36 KVM_DEV_VFIO_GROUP_ADD: same as KVM_DEV_VFIO_FILE_ADD for group fd only
38 KVM_DEV_VFIO_GROUP_DEL: same as KVM_DEV_VFIO_FILE_DEL for group fd only
40 KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: attaches a guest visible TCE table
41 allocated by sPAPR KVM.
42 kvm_device_attr.addr points to a struct::
44 struct kvm_vfio_spapr_tce {
51 - @groupfd is a file descriptor for a VFIO group;
52 - @tablefd is a file descriptor for a TCE table allocated via
55 The FILE/GROUP_ADD operation above should be invoked prior to accessing the
56 device file descriptor via VFIO_GROUP_GET_DEVICE_FD in order to support
57 drivers which require a kvm pointer to be set in their .open_device()
58 callback. It is the same for device file descriptor via character device
59 open which gets device access via VFIO_DEVICE_BIND_IOMMUFD. For such file
60 descriptors, FILE_ADD should be invoked before VFIO_DEVICE_BIND_IOMMUFD
61 to support the drivers mentioned in prior sentence as well.