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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="gimproviders">
<title>Paravirtualization Providers</title>
<body>
<p>
<ph conkeyref="vbox-conkeyref-phrases/product-name"/> enables the exposure of a paravirtualization
interface, to facilitate accurate and efficient execution of
software within a virtual machine. These interfaces require the
guest operating system to recognize their presence and make use of
them in order to leverage the benefits of communicating with the
<ph conkeyref="vbox-conkeyref-phrases/product-name"/> hypervisor.
</p>
<p>
Most modern, mainstream guest operating systems, including Windows
and Linux, ship with support for one or more paravirtualization
interfaces. Hence, there is typically no need to install
additional software in the guest to take advantage of this
feature.
</p>
<p>
Exposing a paravirtualization provider to the guest operating
system does not rely on the choice of host platforms. For example,
the <i>Hyper-V</i> paravirtualization provider can
be used for VMs to run on any host platform supported by
<ph conkeyref="vbox-conkeyref-phrases/product-name"/> and not just Windows.
</p>
<p>
<ph conkeyref="vbox-conkeyref-phrases/product-name"/> provides the following interfaces:
</p>
<ul>
<li>
<p><b outputclass="bold">Minimal</b>: Announces the
presence of a virtualized environment. Additionally, reports
the TSC and APIC frequency to the guest operating system. This
provider is mandatory for running any Mac OS X guests.
</p>
</li>
<li>
<p><b outputclass="bold">KVM</b>: Presents a Linux KVM
hypervisor interface which is recognized by Linux kernels
version 2.6.25 or later. <ph conkeyref="vbox-conkeyref-phrases/product-name"/>'s implementation
currently supports paravirtualized clocks and SMP spinlocks.
This provider is recommended for Linux guests.
</p>
</li>
<li>
<p><b outputclass="bold">Hyper-V</b>: Presents a Microsoft
Hyper-V hypervisor interface which is recognized by Windows 7
and newer operating systems. <ph conkeyref="vbox-conkeyref-phrases/product-name"/>'s implementation
currently supports paravirtualized clocks, APIC frequency
reporting, guest debugging, guest crash reporting and relaxed
timer checks. This provider is recommended for Windows guests.
</p>
</li>
</ul>
</body>
</topic>
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