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Re: [Qemu-devel] -rtc clock=vm with -icount 1, sleep=off introduces unex

From: Paolo Bonzini
Subject: Re: [Qemu-devel] -rtc clock=vm with -icount 1, sleep=off introduces unexpected delays in device interactions
Date: Tue, 14 Mar 2017 17:52:34 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0

On 14/03/2017 13:18, Pavel Dovgalyuk wrote:
>> From: Paolo Bonzini [mailto:address@hidden
>> On 14/03/2017 13:10, Pavel Dovgalyuk wrote:
>>> This is not the same.
>>> BQL helped in making execution deterministic - no io and timer
>>> callbacks were performed while CPU is executing.
>>> Now iothread and CPU thread work simultaneously and timers can't
>>> query virtual time correctly, because (if we could query number of executed
>>> instructions) it may have different values on different runs.
>>> I guess you'll have to bring kicking CPU back on iothread invocation
>>> to make execution deterministic in icount mode.
>> Timers are fixed by my patch.  I/O should also work if its effects are
>> only apparent at given QEMU_CLOCK_VIRTUAL values.
> Can you point me on that patch?

I sent a pull request now, but it doesn't fix record/replay.



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