Firmware containing Hypervisor on CMT servers with an ILOM reserve memory during boot

Asset ID:	1-79-1453086.1
Update Date:	2018-01-22
Keywords:

Solution Type Predictive Self-Healing Sure

Solution 1453086.1 : Firmware containing Hypervisor on CMT servers with an ILOM reserve memory during boot

Applies to:

Netra T3-1
Sun Blade T6320 Server Module
SPARC T4-1
Sun SPARC Enterprise T5240 Server
Sun Fire T2000 Server
Information in this document applies to any platform.

Purpose

This document discusses the use of RAM by the Hypervisor in various CMT servers

Scope

Details

The Hypervisor and other low level software controls & sub-divides platform resources. The Hypervisor was developed for the Sun Fire T2000 & is also used on the later Chip Multi-Threading (CMT) platforms. This software was split off of the Solaris kernel & performs:
    1. Virtual to Physical Address translation
    2. Controls Virtual IO resources direction to Physical Resources
    3. Has hardware error handling agents which report to FMA

Only one Hypervisor exists on the server which can control one of more Logical Domains (LDom). Thus, a portion of RAM must be reserved for use by the Hypervisor to control the functionality above for all LDoms. Each type of CMT platform reserves a specific amount of RAM s shown in the table below:

Memory Allocated to _sys_
All T8-x platforms	3.4GB
All S7-2 platforms	1.8GB
All T5-x & T7-x platforms	1GB
All SPARC T3-x, T4-x	512MB
Sun SPARC Enterprise T5440	288MB
Sun SPARC Enterprise T5140/T5240/T6340	128MB
Netra T5440/T6340	128MB
Sun SPARC Enterprise T5120/T5220/T6320	128MB
Netra T5220/CP3260	128MB
Sun Fire T2000/T1000/T6300	128MB
Netra T2000/CP3060	128MB

The amount of memory can be obtained via command (bound to _sys_):

root@ns7-2-sca11-a:~# ldm ls-devices -a memory
MEMORY
    PA                   SIZE            BOUND
    0x0                  60M             _sys_
    0x3c00000            32M             _sys_
    0x5c00000            94M             _sys_
    0xba00000            1030M           _sys_
    0x4c000000           64M             _sys_
    0x50000000           16G             primary
    0x450000000          244224M
    0x3ff0000000         128M            _sys_
    0x3ff8000000         64M             _sys_
    0x3ffc000000         64M             _sys_
    0x400000000000       261888M
    0x403ff0000000       192M            _sys_
    0x403ffc000000       64M             _sys_

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