[pve-devel] [PATCH docs] add section about usb passthrough

Dominik Csapak d.csapak at proxmox.com
Wed Jun 8 15:28:59 CEST 2016


On 06/08/2016 03:25 PM, Dominik Csapak wrote:
> Signed-off-by: Dominik Csapak <d.csapak at proxmox.com>
> ---
>   qm.adoc | 34 ++++++++++++++++++++++++++++++++++
>   1 file changed, 34 insertions(+)
>
> diff --git a/qm.adoc b/qm.adoc
> index 342966d..8917046 100644
> --- a/qm.adoc
> +++ b/qm.adoc
> @@ -261,6 +261,40 @@ systems.
>   When allocating RAMs to your VMs, a good rule of thumb is always to leave 1GB
>   of RAM available to the host.
>
> +USB Passthrough
> +~~~~~~~~~~~~~~~
> +There are two different types of USB passthrough devices:
> +
> +* Host USB passtrough
> +* SPICE USB passthrough
> +
> +Host USB passthrough works by giving a VM a USB device of the host.
> +This can either be done via the vendor- and product-id, or
> +via the host bus and port.
> +
> +The vendor/product-id looks like this: *0123:abcd*,
> +where *0123* is the id of the vendor, and *abcd* is the id
> +of the product, meaning two pieces of the same usb device
> +have the same id.
> +
> +The bus/port looks like this: *1-2.3.4*, where *1* is the bus
> +and *2.3.4* is the port path. This represents the physical
> +ports of your host (depending of the internal order of the
> +usb controllers).
> +
> +If a device is present in a VM configuration when the VM starts up,
> +but the device is not present in the host, the VM can boot without problems.
> +As soon as the device/port ist available in the host, it gets passed through.
> +
> +WARNING: Using this kind of USB passthrough, means that you cannot move
> +a VM online to another host, since the hardware is only available
> +on the host the VM is currently residing.
> +
> +The second type of passthrough is SPICE USB passthrough. This is useful
> +if you use a SPCIE client which supports it. If you add a SPICE USB port

s/SPCIE/SPICE/

> +to your VM, you can passthrough a USB device from where your SPICE client is,
> +directly to the VM (for example an input device or hardware dongle).
> +
>   Managing Virtual Machines with 'qm'
>   ------------------------------------
>
>




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