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Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite

From: Jan Kiszka
Subject: Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop
Date: Thu, 28 Jun 2012 15:25:46 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2012-06-28 15:05, Peter Lieven wrote:
> Hi,
> i debugged my initial problem further and found out that the problem
> happens to be that
> the main thread is stuck in pause_all_vcpus() on reset or quit commands
> in the monitor
> if one cpu is stuck in the do-while loop kvm_cpu_exec. If I modify the
> condition from while (ret == 0)
> to while ((ret == 0) && !env->stop); it works, but is this the right fix?
> "Quit" command seems to work, but on "Reset" the VM enterns pause state.

Before entering the wait loop in pause_all_vcpus, there are kicks sent
to all vcpus. Now we need to find out why some of those kicks apparently
don't reach the destination.

 - on which host kernels does this occur, and which change may have
   changed it?
 - with which qemu-kvm version is it reproducible, and which commit
   introduced or fixed it?

I failed reproducing so far.


Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux

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