Intel i3-3130M AW8063801111500 User Manual

Product codes
AW8063801111500
Page of 112
Technologies 
40
Datasheet, Volume 1
3.1.2
Intel
®
 Virtualization Technology (Intel
®
 VT) for 
IA-32, Intel
®
 64 and Intel
®
 Architecture  
(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 
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
®
 Virtualization Technology (Intel
®
 VT) for Directed 
I/O (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.