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Re: [Qemu-discuss] How do -icount flags work in QEMU TCG

From: Peter Maydell
Subject: Re: [Qemu-discuss] How do -icount flags work in QEMU TCG
Date: Sat, 24 Mar 2018 16:27:59 +0000

On 23 March 2018 at 19:47, Arnabjyoti Kalita <address@hidden> wrote:
> Hi Peter,
> Yes only I could see that. Sorry for dumping out incomplete logs :)
> Well I think I figured out the source of this representation of repeating TB
> blocks. Your 3rd point in your previous answer was the solution. The fact
> that QEMU in TCG mode executes I/O instructions at the end of the
> translation block is causing these blocks to repeat. What helped me to
> figure this out was a recent patch in the QEMU source code.
> This is the patch :
> https://github.com/qemu/qemu/commit/0790f86861079b1932679d0f011e431aaf4ee9e2

Note that that patch turned out to be incorrect. There's a fix to it:


which hasn't made it into git yet but should do in the not too
distant future.

-- PMM

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