Sun Microsystems VIRTUALBOX 3.0.0 - Manual (Page 18)

1 Introduction
1.6 64-bit guests
Starting with Version 2.0, VirtualBox also supports 64-bit guest operating systems.
Starting with Version 2.1, you can even run 64-bit guests on a 32-bit host operating
system, so long as you have sufficient hardware.
In particular, 64-bit guests are supported under the following conditions:
1. You need a 64-bit processor with hardware virtualization support (see chapter
1.2 , Software vs. hardware virtualization (VT-x and AMD-V) , page 11 ).
2. You must enable hardware virtualization for the particular VM for which you
want 64-bit support; software virtualization is not supported for 64-bit VMs.
3. If you want to use 64-bit guest support on a 32-bit host operating system, you
must also select a 64-bit operating system for the particular VM. Since supporting
64 bits on 32-bit hosts incurs additional overhead, VirtualBox only enables this
support upon explicit request.
On 64-bit hosts, 64-bit guest support is always enabled, so you can simply install
a 64-bit operating system in the guest.
Warning: On any host, you should enable the I/O APIC for virtual machines
that you intend to use in 64-bit mode. This is especially true for 64-bit Win-
dows VMs. See chapter
3.7.1.2 , “Advanced” tab , page 46 . In addition, for
64-bit Windows guests, you should make sure that the VM uses the Intel net-
working device, since there is no 64-bit driver support for the AMD PCNet
card; see chapter
6.1 , Virtual networking hardware , page 82 .
If you use the “Create VM” wizard of the VirtualBox graphical user interface (see
chapter 3.2 , Creating a virtual machine , page 32 ), VirtualBox will automatically use
the correct settings for each selected 64-bit operating system type.
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