[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] implementing architectural timers using QEMU timers
From: |
Max Filippov |
Subject: |
Re: [Qemu-devel] implementing architectural timers using QEMU timers |
Date: |
Tue, 10 Jan 2017 10:51:04 -0800 |
On Tue, Jan 10, 2017 at 10:47 AM, Peter Maydell
<address@hidden> wrote:
> On 10 January 2017 at 18:39, Max Filippov <address@hidden> 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)
Yes, it does. Without these calls qemu aborts if I actually try to
access timers. But these functions themselves don't guarantee
anything, as they just generate code that sets can_do_io in the
env to 1 and to 0.
--
Thanks.
-- Max
- [Qemu-devel] implementing architectural timers using QEMU timers, Max Filippov, 2017/01/09
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Alex Bligh, 2017/01/09
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Pavel Dovgalyuk, 2017/01/10
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Max Filippov, 2017/01/10
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Pavel Dovgalyuk, 2017/01/12
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Peter Maydell, 2017/01/12
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Pavel Dovgalyuk, 2017/01/12
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Paolo Bonzini, 2017/01/16
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Pavel Dovgalyuk, 2017/01/17
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Max Filippov, 2017/01/17
- Re: [Qemu-devel] implementing architectural timers using QEMU timers, Max Filippov, 2017/01/15
Re: [Qemu-devel] implementing architectural timers using QEMU timers, Frederic Konrad, 2017/01/10