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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 13:15:16 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0

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.


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