New features include Xen Security Modules (XSM),
ACPI S3 suspend-to-RAM support for the host
system, preliminary PCI pass-through support
(using appropriate Intel or AMD I/O-virtualization
hardware), and preliminary support for a wider
range of bootloaders in fully virtualized (HVM)
guests, using full emulation of x86 real mode.
Emulation of standard (non-super) VGA modes for
HVM guests was made faster. Configurable timer
modes were added for HVM guests, depending on how
the guest OS manages time-keeping.