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[Qemu-devel] Re: [PATCH v4 4/4] docs: Document virtio PCI -device ioeven
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH v4 4/4] docs: Document virtio PCI -device ioeventfd=on|off |
Date: |
Sun, 12 Dec 2010 13:24:43 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Nov 17, 2010 at 04:19:29PM +0000, Stefan Hajnoczi wrote:
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
> docs/qdev-device-use.txt | 9 +++++++--
> 1 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/docs/qdev-device-use.txt b/docs/qdev-device-use.txt
> index f252c8e..85feda7 100644
> --- a/docs/qdev-device-use.txt
> +++ b/docs/qdev-device-use.txt
> @@ -97,15 +97,17 @@ 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.
>
> * if=pflash, if=mtd, if=sd, if=xen are not yet available with -device
> -
Intentional?
> For USB devices, the old way is actually different:
>
> -usbdevice disk:format=FMT:FILENAME
> @@ -240,6 +242,9 @@ 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 (default) or off.
> +
> -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.
> --
> 1.7.2.3
- [Qemu-devel] Re: [PATCH v4 4/4] docs: Document virtio PCI -device ioeventfd=on|off,
Michael S. Tsirkin <=