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add section about usb passthrough

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Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
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Dominik Csapak 2016-06-08 15:25:28 +02:00 committed by Dietmar Maurer
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commit 685cc8e0ba
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@ -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 SPICE client which supports it. If you add a SPICE USB port
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'
------------------------------------