Oracle VM: Comparison/Conversion between Guest Virtualisation Modes: HVM, PVM and HVM with PV Drivers
(Doc ID 757719.1)
Last updated on MAY 22, 2023
Applies to:
Oracle VM - Version 2.1 to 3.4.1 [Release OVM21 to OVM34]Oracle Cloud Infrastructure - Version N/A and later
Private Cloud Appliance X8-2
Linux x86-64
Linux x86
Goal
The purpose of this article is to:
- Describe, compare and contrast available Oracle VM guest virtualisation modes
- Outline how to verify and validate the virtualisation mode used by a Virtual Machine guest
- Describe how to change the virtualisation mode of a guest VM
The article is intended for both Oracle VM and Linux System Administrators
Solution
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In this Document
| Goal |
| Solution |
| 1. Oracle VM Virtualisation Modes |
| 1A. Hardware Virtualised (HVM) |
| 1B. Paravirtualised (PVM) |
| 1C. Hardware Virtualised (HVM) with Paravirtualised (PV) Drivers (HVM+PV) |
| 2. Supported Guest Operating Systems and Permissible Virtualisation Modes |
| 2.1 Special note regarding Oracle Linux |
| 2.2 Special note regarding Oracle Solaris |
| 3. Virtualisation Mode Hardware Requirements |
| 3A. HVM Requirements |
| 3B. PVM Requirements |
| 3C. HVM+PV Requirements |
| 4. Virtualisation Modes - Advantages & Disadvantages |
| 4A. HVM Advantages & Disadvantages |
| 4B. PVM Advantages & Disadvantages |
| 4C. HVM+PV Advantages & Disadvantages |
| 5. Virtualisation Mode Validation |
| 5A. HVM Mode Validation |
| 5B. PVM Mode Validation |
| 5C. HVM+PV Mode Validation |
| 6. Legacy Oracle Linux Kernel Information |
| 6A. HVM |
| 6B. PVM |
| 6C. HVM+PV |
| 7. Conversion from One Virtualisation Mode to Another |
| 7A. Oracle VM 2.x: Oracle Linux Legacy guest VM Conversion from HVM to HVM+PV (applicable to < OL4U7, < OL5U3 only) |
| 7A1. Backup the guest |
| 7A2. Install kmod-xenpv and modversions/module-init-tools |
| 7A3 Modify /etc/modprobe.conf to use PV Drivers |
| 7A4. Create Initial Ramdisk (initrd) with PV Drivers |
| 7A5. Modify /boot/grub/grub.conf |
| 7A6. Configure 'xm console' access to guest |
| 7A7. Shutdown the guest |
| 7A8. Reconfigure the guest configuration file (vm.cfg) |
| 7A9. Restart the guest |
| 8. Virtualisation Mode Testing and Selection |
| A. Appendix |
| A1. Sample Oracle Linux HVM Guest Configuration |
| A2. Sample Oracle Linux PVM Guest Configuration |
| A3. Sample Oracle Linux HVM+PV Guest Configuration |
| References |