Dell XPS 14 9440 Owner's Manual page 98

Table 39. System setup options—Virtualization Support menu (continued)
Virtualization Support
Enable Intel VT for Direct I/O
Intel Trusted Execution Technology
(TXT)
DMA Protection
Enable Pre-Boot DMA Support
Enable OS Kernel DMA Support
Table 40. System setup options—Performance menu
Performance
Multi-Core Support
Multiple Atom Cores
Active Multiple Performance Cores (P-
Cores)
Active Efficient Cores (E-Cores) Select
98 BIOS Setup
When enabled, the computer can perform Virtualization Technology for Direct
I/O (VT-d). VT-d is an Intel method that provides virtualization for memory map
I/O.
By default, the Enable Intel VT for Direct I/O option is enabled.
Intel Trusted Execution Technology (TXT) is a set of hardware extensions to Intel
processors and chipsets. It provides a hardware-based root of trust to ensure
that a platform boots with a known good configuration of firmware, BIOS, virtual
machine monitor, and operating system. The following must be enabled in order
to enable Intel TXT -
● Intel Virtualization Technology - X
● Intel Virtualization Technology - Direct
By default, the Intel Trusted Execution Technology (TXT) option is enabled.
For additional security, Dell Technologies recommends keeping the Intel Trusted
Execution Technology (TXT) option enabled.
Allows you to control the Pre-Boot DMA protection for both internal and external
ports. This option does not directly enable DMA protection in the operating
system.
NOTE: This option is not available when the virtualization setting for IOMMU
is disabled (VT-d/AMD Vi).
By default, the Enable Pre-Boot DMA Support option is enabled.
For additional security, Dell Technologies recommends keeping the Enable Pre-
Boot DMA Support option enabled.
NOTE: This option is provided only for compatibility purposes, since some
older hardware is not DMA capable.
Allows you to control the Kernel DMA protection for both internal and external
ports. This option does not directly enable DMA protection in the operating
system. For operating systems that support DMA protection, this setting
indicates to the operating system that the BIOS supports the feature.
NOTE: This option is not available when the virtualization setting for IOMMU
is disabled (VT-d/AMD Vi).
By default, the Enable OS Kernel DMA Support option is enabled.
NOTE: This option is provided only for compatibility purposes, since some
older hardware is not DMA capable.
Enables to change the number of Atom cores available to the operating system.
The default value is set to the maximum number of cores.
By default, the All Active option is selected.
Enables to enter the number of active multiple performance cores.
Default: 03
Enables you to change the number of processor E-Cores available to the
operating system.
Default: All Active