Re: [Qemu-devel] implementing architectural timers using QEMU timers

[Peter Maydell]

On 12 January 2017 at 11:28, Pavel Dovgalyuk <address@hidden> wrote:
>> From: Max Filippov [mailto:address@hidden
>> Ok, looks like what happens in my case is that instruction that
>> sets CCOMPARE and thus changes remaining icount does not
>> cause exit from the cpu_exec. So merely ending TB on
>> QEMU_CLOCK_VIRTUAL timer update is not enough, I need to
>> throw an exception of some kind? Or does the timer code need
>> to take care of that?
>
> Yes, it seems that you should end the block with an exception,
> to allow icount loop recalculate the timeouts.

Really? The ARM translate.c doesn't generate an exception.
It just does
 gen_io_end();
 gen_lookup_tb();

(so we force a lookup of the next TB, but don't throw an
exception of any kind).

thanks
-- PMM