Find Virtual Machine Monitor (VMM) execution mode


In VMware ESX/ESXi hypervisor, for each virtual machine there will be one VMM running parallel in side the hypervisor kernel . The VMM is the heart of every virtual machine, the VMM sits in between the Virtual machine and hypervisor kernel. The VMM translates the Virtual machine requests like CPU, RAM, IO etc to the VMkernel, then the VMkernel will schedule and executes those virtual machine requests.

So to understand how the VMM works and what kind of execution engine is used by the VMM ? etc is important and this can be easily found from the virtual machine log file.

In the ESX/ESXi host, browse the datastore, open the virtual machine log and check the below lines, the red line indicates the current VMM execution engine is it using, whether the processor is capable of hardware memory management unit which is used or memory virtualization.

2012-04-15T09:30:43.171Z| vmx| MONITOR MODE: allowed modes          : BT32 HV HWMMU
2012-04-15T09:30:43.171Z| vmx| MONITOR MODE: user requested modes   : BT32 HV HWMMU
2012-04-15T09:30:43.171Z| vmx| MONITOR MODE: guestOS preferred modes: HWMMU HV BT32
2012-04-15T09:30:43.171Z| vmx| MONITOR MODE: filtered list          : HWMMU HV BT32

2012-04-15T09:30:43.171Z| vmx| HV Settings: virtual exec = ‘hardware’; virtual mmu = ‘hardware’

2012-04-15T09:30:43.171Z| vmx| VPID and EPT Capabilities (0x00000f0106114141)

2012-04-15T09:30:43.171Z| vmx|   EPT memory type WB               yes
2012-04-15T09:30:43.171Z| vmx|   2MB super-page                   yes
2012-04-15T09:30:43.171Z| vmx|   INVEPT support                   yes
2012-04-15T09:30:43.171Z| vmx|   Type 1 INVEPT                    yes
2012-04-15T09:30:43.171Z| vmx|   Type 2 INVEPT                    yes

HWMMU = Hardware memory management unit

– The processor should have EPT or RVI, EPT (Extended Page Tables) for Intel and RVI (Rapid Virtualization Index) for AMD

HV (means processor is capable of Hardware assistance and the vm can use)

BT32 = Binary Translation 32 (When using BT32 (BT32 you can see only in Intel processors), the virtual machine runs with software virtualization for as long as possible, but it dynamically switches to hardware virtualization if the virtual machine enters 64‐bit mode.)

BT = Binary Translation invented by the VMware, this is a software based technique to virtualize a CPU, that it will translates the virtual CPU instructions to the real physical CPU instructions.

You can change the VMM execution mode for a virtual machine, as below

1 – Power off the VM

2- Edit the VM settings

3- Go to “Options” menu bar > select the “CPU/MMU Virtualization” section

4  – There you can change



NOTE – It is not recommended to change these settings, in some workloads and some specific scenarios we can change.


About GK_RAJ

An enthusiastic IT person, with an intense passion towards Datacenter technologies. I am a VMware vExpert Title holder and working as a Technical Consultant, in Qatar. I am exposed to VMware vSphere, Storage, Bladecenters, Datacenter operations, Symantec Backup, Deduplication technologies and carry rich and diversified experience in these domains. I specialize in Designing & Consulting on VMware VSphere, the integration of Storage and Network Stacks to VSphere. With my experience, I help Organizations/Enterprises to achieve their CAPEX & OPEX savings, develop DR and BCP strategies, Consolidation services with Virtualization using VSphere, and prepare them to move to Cloud. In the meantime, I would like to share my knowledge and do a good contribution to the community. I am an Indian citizen, and have a Engineering degree in Electronics and Communication. I have certified in VCAP5-DCD, VCP-Cloud, VCP 4 & 5, MCITP, MCSE.

Posted on July 10, 2012, in VMware. Bookmark the permalink. Leave a comment.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

Dan Gorman's Technology News Aggregation

My Daily Readings from Zite

Geek Searching Truths of Virtualization and Cloud Space


Studies in Data Center Networking, Virtualization, Computing

Every Cloud Has a Tin Lining.


Experience the Datacenter Technologies – VMware vEvangelist

Experience the Datacenter Technologies

The weblog of an IT pro specializing in virtualization, storage, and servers

Eric Sloof - NTPRO.NL

Experience the Datacenter Technologies


Experience the Datacenter Technologies

Welcome to vSphere-land!

your ultimate VMware information destination

Michelle Laverick...

Images too small? Try "zooming" in with your web-browser...


By Josh Odgers - VCDX#90

Long White Virtual Clouds

all things vmware, cloud and virtualizing business critical applications

Virtual Geek

Experience the Datacenter Technologies

Yellow Bricks

by Duncan Epping

%d bloggers like this: