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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:

VMASST_CMD_enable
Enable a particular assist type
VMASST_CMD_disable
Disable a particular assist type

And the available types are:

VMASST_TYPE_4gb_segments
Provide emulated support for instructions that rely on 4GB segments (such as the techniques used by some TLS solutions).
VMASST_TYPE_4gb_segments_notify
Provide a callback to the guest if the above segment fixups are used: allows the guest to display a warning message during boot.
VMASST_TYPE_writable_pagetables
Enable writable pagetable mode - described above.

Xen 3.0 Virtualization Interface Guide
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