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4.3. Virt ualized hardware devices
Virtualization on Red Hat Enterprise Linux 6 presents three distinct types of system devices to virtual
machines. The three types include:
Virtualized and emulated devices
Para-virtualized devices
Physically shared devices
These hardware devices all appear as being physically attached to the virtual machine but the
device drivers work in different ways.
4 .3.1. Virt ualiz ed and emulat ed devices
KVM implements many core devices for virtual machines in software. These emulated hardware
devices are crucial for virtualizing operating systems.
Emulated devices are virtual devices which exist entirely in software.
Emulated drivers may use either a physical device or a virtual software device. Emulated drivers are a
translation layer between the virtual machine and the Linux kernel (which manages the source
device). The device level instructions are completely translated by the KVM hypervisor. Any device, of
the same type (storage, network, keyboard, and mouse) and recognized by the Linux kernel, may be
used as the backing source device for the emulated drivers.
Virt u al C PUs ( vCPUs)
A host system can have up to 160 virtual CPUs (vCPUs) that can be presented to guests for
their use, regardless of the number of host CPUs.
Emu lat ed g rap h ics d evices
Two emulated graphics devices are provided. These devices can be connected to with the
SPICE (Simple Protocol for Independent Computing Environments) protocol or with VNC:
A Cirrus CLGD 5446 PCI VGA card (using the cirrus device)
A standard VGA graphics card with Bochs VESA extensions (hardware level, including
all non-standard modes)
Emu lat ed syst em co mp o n en t s
The following core system components are emulated to provide basic system functions:
Intel i440FX host PCI bridge
PIIX3 PCI to ISA bridge
PS/2 mouse and keyboard
EvTouch USB Graphics Tablet
PCI UHCI USB controller and a virtualized USB hub
Emulated serial ports
EHCI controller, virtualized USB storage and a USB mouse
Emu lat ed so u n d d evices
Chapt er 4 . Int roduct io n t o Red Hat virt ualizat ion product s
19
- Red Hat Enterprise Linux 6 1
- Table of Contents 5
- 1. Document Convent ions 6
- 1.2. Pull-quot e Convent ions 7
- 2.2. We Need Feedback! 9
- Chapter 1. Introduction 10
- Chapt er 1 . Int roduct io n 11
- 2.2. Migrat ion 13
- 3.1. Virt ualizat ion cost s 16
- 3.3. Performance 16
- 3.4. Disast er recovery 17
- 3.5. Securit y 17
- Important 20
- 4.4. Guest CPU models 27
- 4.5. St orage 28
- 4 .5.4 . Host st orage 29
- 5.1. vi rsh 31
- 5.2. vi rt-manag er 31
- 5.3. vi rt-i nstal l 31
- 5.4. g uestfi sh 32
- 5.5. Ot her useful t ools 32
- Revision History 36
- Revision Hist ory 37
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