Dell Latitude 5550 Owners Manual - Page 161

Table 55. System Setup options-Virtualization Support menu continued

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Table 55. System Setup options-Virtualization Support menu (continued) Virtualization Support Enable Intel VT for Direct I/O 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. NOTE: To view this option, enable Advanced Setup mode as described in View Advanced Setup options. Intel Trusted Execution Technology (TXT) Specifies whether a measured Virtual Machine Monitor (MVMM) can use the additional hardware capabilities provided by Intel Trusted Execution Technology. The following must be enabled in order to enable Intel TXT ● Trusted Platform Module (TPM) ● Intel Hyper-Threading ● All CPU cores (Multi-Core Support) ● Intel Virtualization Technology ● Intel VT for Direct I/O By default, the Intel Trusted Execution Technology (TXT) option is disabled. NOTE: To view this option, enable Advanced Setup mode as described in View Advanced Setup options. DMA Protection Enable Pre-Boot DMA Support 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 PreBoot DMA Support option enabled. NOTE: This option is provided only for compatibility purposes, since some older hardware is not DMA capable. NOTE: To view this option, enable Advanced Setup mode as described in View Advanced Setup options. Enable OS Kernel DMA Support 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. NOTE: To view this option, enable Advanced Setup mode as described in View Advanced Setup options. Internal Port DMA Compatibility Mode By default, the Internal Port DMA Compatibility Mode option is disabled. Table 56. System Setup options-Performance menu Performance Multi-Core Support BIOS Setup 161

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Table 55. System Setup options—Virtualization Support menu (continued)
Virtualization Support
Enable Intel VT for Direct I/O
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.
NOTE:
To view this option, enable
Advanced Setup
mode as described in
View Advanced Setup options
.
Intel Trusted Execution Technology
(TXT)
Specifies whether a measured Virtual Machine Monitor (MVMM) can use the
additional hardware capabilities provided by Intel Trusted Execution Technology.
The following must be enabled in order to enable Intel TXT -
●
Trusted Platform Module (TPM)
●
Intel Hyper-Threading
●
All CPU cores (Multi-Core Support)
●
Intel Virtualization Technology
●
Intel VT for Direct I/O
By default, the
Intel Trusted Execution Technology (TXT)
option is disabled.
NOTE:
To view this option, enable
Advanced Setup
mode as described in
View Advanced Setup options
.
DMA Protection
Enable Pre-Boot DMA Support
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.
NOTE:
To view this option, enable
Advanced Setup
mode as described in
View Advanced Setup options
.
Enable OS Kernel DMA Support
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.
NOTE:
To view this option, enable
Advanced Setup
mode as described in
View Advanced Setup options
.
Internal Port DMA Compatibility Mode
By default, the
Internal Port DMA Compatibility Mode
option is disabled.
Table 56. System Setup options—Performance menu 
Performance
Multi-Core Support
BIOS Setup
161