diff options
Diffstat (limited to 'docs/qdev-device-use.txt')
| -rw-r--r-- | docs/qdev-device-use.txt | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/docs/qdev-device-use.txt b/docs/qdev-device-use.txt index f252c8e3bc..f2f9b757a5 100644 --- a/docs/qdev-device-use.txt +++ b/docs/qdev-device-use.txt @@ -97,10 +97,13 @@ The -device argument differs in detail for each kind of drive: * if=virtio - -device virtio-blk-pci,drive=DRIVE-ID,class=C,vectors=V + -device virtio-blk-pci,drive=DRIVE-ID,class=C,vectors=V,ioeventfd=IOEVENTFD This lets you control PCI device class and MSI-X vectors. + IOEVENTFD controls whether or not ioeventfd is used for virtqueue notify. It + can be set to on (default) or off. + As for all PCI devices, you can add bus=PCI-BUS,addr=DEVFN to control the PCI device address. @@ -240,6 +243,9 @@ For PCI devices, you can add bus=PCI-BUS,addr=DEVFN to control the PCI device address, as usual. The old -net nic provides parameter addr for that, it is silently ignored when the NIC is not a PCI device. +For virtio-net-pci, you can control whether or not ioeventfd is used for +virtqueue notify by setting ioeventfd= to on or off (default). + -net nic accepts vectors=V for all models, but it's silently ignored except for virtio-net-pci (model=virtio). With -device, only devices that support it accept it. |