Red Hat Training
A Red Hat training course is available for Red Hat Enterprise Linux
23.14. Hypervisor Features
Hypervisors may allow certain CPU or machine features to be enabled (
state='on'
) or disabled (state='off'
).
... <features> <pae/> <acpi/> <apic/> <hap/> <privnet/> <hyperv> <relaxed state='on'/> </hyperv> </features> ...
Figure 23.24. Hypervisor features
All features are listed within the
<features>
element, if a <state>
is not specified it is disabled. The available features can be found by calling the capabilities
XML, but a common set for fully virtualized domains are:
Table 23.10. Hypervisor features elements
State | Description |
---|---|
<pae> | Physical address extension mode allows 32-bit guest virtual machines to address more than 4 GB of memory. |
<acpi> | Useful for power management. For example, with KVM guest virtual machines it is required for graceful shutdown to work. |
<apic> | Allows the use of programmable IRQ management. This element has an optional attribute eoi with values on and off , which sets the availability of EOI (End of Interrupt) for the guest virtual machine. |
<hap> | Enables the use of hardware assisted paging if it is available in the hardware. |