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Diffstat (limited to 'Documentation/virt/kvm/devices/vfio.rst')
| -rw-r--r-- | Documentation/virt/kvm/devices/vfio.rst | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/devices/vfio.rst b/Documentation/virt/kvm/devices/vfio.rst new file mode 100644 index 000000000..2d20dc561 --- /dev/null +++ b/Documentation/virt/kvm/devices/vfio.rst @@ -0,0 +1,41 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=================== +VFIO virtual device +=================== + +Device types supported: + + - KVM_DEV_TYPE_VFIO + +Only one VFIO instance may be created per VM. The created device +tracks VFIO groups in use by the VM and features of those groups +important to the correctness and acceleration of the VM. As groups +are enabled and disabled for use by the VM, KVM should be updated +about their presence. When registered with KVM, a reference to the +VFIO-group is held by KVM. + +Groups: + KVM_DEV_VFIO_GROUP + +KVM_DEV_VFIO_GROUP attributes: + KVM_DEV_VFIO_GROUP_ADD: Add a VFIO group to VFIO-KVM device tracking + kvm_device_attr.addr points to an int32_t file descriptor + for the VFIO group. + KVM_DEV_VFIO_GROUP_DEL: Remove a VFIO group from VFIO-KVM device tracking + kvm_device_attr.addr points to an int32_t file descriptor + for the VFIO group. + KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: attaches a guest visible TCE table + allocated by sPAPR KVM. + kvm_device_attr.addr points to a struct:: + + struct kvm_vfio_spapr_tce { + __s32 groupfd; + __s32 tablefd; + }; + + where: + + - @groupfd is a file descriptor for a VFIO group; + - @tablefd is a file descriptor for a TCE table allocated via + KVM_CREATE_SPAPR_TCE. |