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Xen 3.0 Virtualization Interface Guide
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3.8 VM assists

Xen provides a number of ``assists'' for guest memory management. These are available on an ``opt-in'' basis to provide commonly-used extra functionality to a guest.

vm_assist(unsigned int cmd, unsigned int type)

The cmd parameter describes the action to be taken, whilst the type parameter describes the kind of assist that is being referred to. Available commands are as follows:

Enable a particular assist type
Disable a particular assist type

And the available types are:

Provide emulated support for instructions that rely on 4GB segments (such as the techniques used by some TLS solutions).
Provide a callback to the guest if the above segment fixups are used: allows the guest to display a warning message during boot.
Enable writable pagetable mode - described above.

Xen 3.0 Virtualization Interface Guide
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