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author | Alex Williamson <alex.williamson@redhat.com> | 2013-10-30 11:02:17 -0600 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-10-30 19:02:03 +0100 |
commit | ec53500fae421e07c5d035918ca454a429732ef4 (patch) | |
tree | 3b9e0c67b9982f5b374e819a55cd510c14d481b8 /Documentation/virtual | |
parent | 84cffe499b9418d6c3b4de2ad9599cc2ec50c607 (diff) | |
download | linux-ec53500fae421e07c5d035918ca454a429732ef4.tar.gz linux-ec53500fae421e07c5d035918ca454a429732ef4.tar.bz2 linux-ec53500fae421e07c5d035918ca454a429732ef4.zip |
kvm: Add VFIO device
So far we've succeeded at making KVM and VFIO mostly unaware of each
other, but areas are cropping up where a connection beyond eventfds
and irqfds needs to be made. This patch introduces a KVM-VFIO device
that is meant to be a gateway for such interaction. The user creates
the device and can add and remove VFIO groups to it via file
descriptors. When a group is added, KVM verifies the group is valid
and gets a reference to it via the VFIO external user interface.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r-- | Documentation/virtual/kvm/devices/vfio.txt | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/vfio.txt b/Documentation/virtual/kvm/devices/vfio.txt new file mode 100644 index 000000000000..ef51740c67ca --- /dev/null +++ b/Documentation/virtual/kvm/devices/vfio.txt @@ -0,0 +1,22 @@ +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_DEV_VFIO_GROUP_DEL: Remove a VFIO group from VFIO-KVM device tracking + +For each, kvm_device_attr.addr points to an int32_t file descriptor +for the VFIO group. |