Novell LINUX ENTERPRISE 11 SP1 - LINUX AUDIT, Manual, Page: 25 / 140

2 Select the option to automatically start the NTP daemon during boot. Provide
the IP address of an existing NTP time server, then click Finish.
NOTE: Time Services on Virtual Guests
Hardware clocks commonly are not very precise. All modern operating systems
try to correct the system time compared to the hardware time by means of an
additional time source. To get the correct time on all VM Guest systems, also
activate the network time services on each respective guest or make sure that
the guest uses the system time of the host. For more about
Independent
Wallclocks
in SUSE Linux Enterprise Desktop see Section 12.2, “Virtual Ma-
chine Clock Settings” (page 100).
For more information about managing virtual machines, see Chapter 5, Managing a
Virtualization Environment (page 33).
2.5 PCI Pass-Through
To take full advantage of VM Guest systems, it is sometimes necessary to assign spe-
cific PCI devices to a dedicated domain. When using fully virtualized guests, this
functionality is only available if the chipset of the system supports this feature, and if
it is activated from the BIOS.
This feature is available from both, AMD* and Intel*. For AMD machines, the feature
is called IOMMU, in Intel speak, this is VT-d. Note that Intel-VT technology is not
sufficient to use this feature for fully virtualized guests. To make sure that your com-
puter supports this feature, ask your supplier specifically to deliver a system that supports
PCI Pass-Through.
Limitations
• Some graphics drivers use highly optimized ways to access DMA. This is not always
supported, and thus using graphics cards may be difficult.
• When accessing PCI devices behind a PCIe bridge, all of the PCI devices must be
assigned to a single guest. This limitations does not apply to PCIe devices.
• Guests with dedicated PCI devices cannot be live migrated to a different host.
Setting Up a Virtual Machine Host 15