Справочник Пользователя для Intel i7-3840QM AW8063801103800
Модели
AW8063801103800
Technologies
40
Datasheet, Volume 1
3.1.2
Intel
®
VT-x Features
The processor core supports the following Intel VT-x features:
• Extended Page Tables (EPT)
— EPT is hardware assisted page table virtualization
— It eliminates VM exits from guest operating system to the VMM for shadow
— It eliminates VM exits from guest operating system to the VMM for shadow
page-table maintenance
• Virtual Processor IDs (VPID)
— Ability to assign a VM ID to tag processor core hardware structures (such as
TLBs)
— This avoids flushes on VM transitions to give a lower-cost VM transition time
and an overall reduction in virtualization overhead
• Guest Preemption Timer
— Mechanism for a VMM to preempt the execution of a guest operating system
after an amount of time specified by the VMM. The VMM sets a timer value
before entering a guest.
— The feature aids VMM developers in flexibility and Quality of Service (QoS)
guarantees
• Descriptor-Table Exiting
— Descriptor-table exiting allows a VMM to protect a guest operating system from
internal (malicious software based) attack by preventing relocation of key
system data structures like IDT (interrupt descriptor table), GDT (global
descriptor table), LDT (local descriptor table), and TSS (task segment selector)
— A VMM using this feature can intercept (by a VM exit) attempts to relocate
these data structures and prevent them from being tampered by malicious
software
3.1.3
Intel
®
VT-d Objectives
The key Intel VT-d objectives are domain-based isolation and hardware-based
virtualization. A domain can be abstractly defined as an isolated environment in a
platform to which a subset of host physical memory is allocated. Virtualization allows
for the creation of one or more partitions on a single system. This could be multiple
partitions in the same operating system, or there can be multiple operating system
instances running on the same system – offering benefits such as system
consolidation, legacy migration, activity partitioning, or security.
virtualization. A domain can be abstractly defined as an isolated environment in a
platform to which a subset of host physical memory is allocated. Virtualization allows
for the creation of one or more partitions on a single system. This could be multiple
partitions in the same operating system, or there can be multiple operating system
instances running on the same system – offering benefits such as system
consolidation, legacy migration, activity partitioning, or security.
3.1.4
Intel
®
VT-d Features
The processor supports the following Intel VT-d features:
• Memory controller and processor graphics comply with Intel
®
VT-d 1.2 specification
• Two VT-d DMA remap engines:
— iGFX DMA remap engine
— DMI/PEG
— DMI/PEG
• Support for root entry, context entry, and default context
• 39-bit guest physical address and host physical address widths
• Support for 4K page sizes only
• 39-bit guest physical address and host physical address widths
• Support for 4K page sizes only