Chapter 4: BIOS
101
Intel
®
VT for Directed I/O (VT-d)
Intel® VT for Directed I/O
Select Yes to use the Intel Virtualization Technology support for Direct I/O VT-d by reporting
the I/O device assignments to the VMM (Virtual Machine Monitor) through the DMAR
ACPI tables. This feature offers fully-protected I/O resource sharing across Intel platforms,
providing greater reliability, security and availability in networking and data-sharing. The
options are
Yes
and No.
ACS (Access Control Services) Control (Available when Intel® VT for Directed I/O
(VT-d) is set to Yes)
Select Enable to program ACS control to Chipset PCIe Root Port bridges. Select Disable to
program ACS control to all PCIe Root Port bridges. The options are
Enable
and Disable.
Interrupt Remapping (Available when "Intel® VT for Directed I/O (VT-d)" is set to
Yes)
Select Enable to support I/O DMA transfer remapping and device-generated interrupts. The
options are
Auto
, Enable, and Disable.
X2APIC Opt Out
Select Enable to enable X2APIC Opt Out mode. The options are Enable and
Disable
.
Pre-boot DMA Protection
Select Enable to enable DMA Protection in pre-boot environment. The options are
Disable
and Enable.
PCIe ACSCTL
Select Enable to overwrite PCI Access Control Services Control register in PCIe root ports.
The options are
Disable
and Enable.
Source Validation (When "PCIe ACSCTL" is set to Enable)
Select Enable to allow the component to validate the upstream requester bus number
against secondary/subordinate bus numbers. The options are
Disable
and Enable.
Translation Blocking (When "PCIe ACSCTL" is set to Enable)
Select Enable to allow the component to block all upstream memory requests with default
the Address Translation (AT) value. The options are
Disable
and
Enable
.
P2P Request Redirect (When "PCIe ACSCTL" is set to Enable)
Select Enable to allow the system to determine when the component redirects peer-to-peer
requests upstream. The options are Disable and
Enable
.
