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From: Peter Maydell <peter.maydell@linaro.org>
Date: Tue, 10 Jan 2017 18:47:04 +0000
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Subject: Re: [Qemu-devel] implementing architectural timers using QEMU timers
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To: Max Filippov <jcmvbkbc@gmail.com>
Cc: Pavel Dovgalyuk <dovgaluk@ispras.ru>, Pavel Dovgaluk <Pavel.Dovgaluk@ispras.ru>, qemu-devel <qemu-devel@nongnu.org>, Alex Bligh <alex@alex.org.uk>, Richard Henderson <rth@twiddle.net>

On 10 January 2017 at 18:39, Max Filippov <jcmvbkbc@gmail.com> wrote:
> 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?

Is your code calling gen_io_start() and gen_io_end() in the right
places around where it generates code to do the CCOMPARE accesses ?
(the rules for getting icount to work right are a bit fiddly)

thanks
-- PMM