Intel C2338 FH8065501516761 Scheda Tecnica
Codici prodotto
FH8065501516761
Intel
®
Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 1 of 3
Order Number: 330061-002US
49
Volume 2—Multi-Core Intel
®
Atom™ Processors—C2000 Product Family
Features
2.4.2.1
Intel
®
VT-x Features
• Extended Page Tables (EPT)
— An EPT is hardware-assisted page table physical memory virtualization.
— The feature supports guest VM execution in unpaged protected mode or in real-
— The feature supports guest VM execution in unpaged protected mode or in real-
address mode.
— EPT eliminates VM exits from guest OS to the VMM for shadow page-table
maintenance.
• Virtual Processor IDs (VPID)
— The ability to use an assigned VM Virtual Processor ID to tag processor core
hardware structures (such as TLBs) allowing a logic processor to cache
information (such as TLBs) for multiple-linear address spaces.
— This avoids flushes on VM transitions to give a lower-cost VM transition time
and an overall reduction in virtualization overhead.
• Guest Preemption Timer
— A mechanism for a VMM to preempt the execution of a guest OS VM 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 flexibility in guest VM scheduling and building QoS schemes.
• Descriptor-Table Exiting
— Descriptor-table exiting allows a VMM to protect a guest OS from internal
(malicious software based) attack by preventing relocation of key system data
structures like Interrupt Descriptor Table (IDT), Global Descriptor Table (GDT),
Local Descriptor Table (LDT), and Task Segment Selector (TSS).
— A VMM using this feature intercepts (by a VM exit) attempts to relocate these
data structures and prevent them from being tampered by malicious software.
• VM Functions
— A VM function is an operation provided by the processor that is invoked using
the VMFUNC instruction from guest VM without a VM exit.
— A VM function to perform EPTP switching is supported and allows guest VM to
load a new value for the EPT pointer, thereby establishing a different EPT
paging structure hierarchy.