On 25/02/16 05:00, Mark Cave-Ayland wrote:
> On 25/02/16 04:33, Mark Cave-Ayland wrote:
>
>> cpu_start/resume():
>> cpu->tb_env->tb_offset =
>> qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) * tb_env->tb_freq +
>> cpu->tb_env->tb_offset -
>> qemu_clock_get_ns(QEMU_CLOCK_HOST)
>
> Actually just realised this is slightly wrong and in fact should be:
>
> cpu_start/resume():
> cpu->tb_env->tb_offset =
> muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL),
> cpu->tb_env->tb_freq, NANOSECONDS_PER_SECOND) +
> cpu->tb_env->tb_offset -
> qemu_clock_get_ns(QEMU_CLOCK_HOST)
Sign. And let me try that again, this time after caffeine:
cpu_start/resume():
cpu->tb_env->tb_offset =
muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL),
cpu->tb_env->tb_freq, NANOSECONDS_PER_SECOND) +
cpu->tb_env->tb_offset -
cpu_get_host_ticks();
This should translate to: at CPU start, calculate the difference between
the current guest virtual timebase and the host timebase, storing the
difference in cpu->tb_env->tb_offset.
ATB,
Mark.
