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...timer handler. */ + BUG(); +} + +void __init setup_vmi_timer(void) +{ + /* Fall back to PIT timer -- for transparent para-virt. */ + if (!vmi_timer_used()) + setup_pit_timer(); +} + +static inline void update_xtime_from_wallclock(long long cycles_offset) +{ + unsigned long long wallclock; + time_t wtm_sec, wall_sec; + long wtm_nsec, wall_nsec; + + wallclock = vmi_get_wallclock(); // nsec units + + /* Adjust wallclock time to the value it would have had on the + * last accounted xtime tick. */ + if (cycles_offset > 0) + wallclock -= cycles_2_ns(cycles_offset); + + wall_nsec = do_div(wallclock,...

...timer handler. */ + BUG(); +} + +void __init setup_vmi_timer(void) +{ + /* Fall back to PIT timer -- for transparent para-virt. */ + if (!vmi_timer_used()) + setup_pit_timer(); +} + +static inline void update_xtime_from_wallclock(long long cycles_offset) +{ + unsigned long long wallclock; + time_t wtm_sec, wall_sec; + long wtm_nsec, wall_nsec; + + wallclock = vmi_get_wallclock(); // nsec units + + /* Adjust wallclock time to the value it would have had on the + * last accounted xtime tick. */ + if (cycles_offset > 0) + wallclock -= cycles_2_ns(cycles_offset); + + wall_nsec = do_div(wallclock,...

Unlike full virtualization in which the virtual machine provides the same platform interface as running natively on the hardware, paravirtualization requires modification to the guest operating system to work with the platform interface provided by the hypervisor. Xen was designed with performance in mind. Calls to the hypervisor are minimized, batched if necessary, and non-critical codepaths

Unlike full virtualization in which the virtual machine provides the same platform interface as running natively on the hardware, paravirtualization requires modification to the guest operating system to work with the platform interface provided by the hypervisor. Xen was designed with performance in mind. Calls to the hypervisor are minimized, batched if necessary, and non-critical codepaths