Re: qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop

[Peter Lieven <pl@dlhnet.de>]

On 28.06.2012 17:22, Jan Kiszka wrote:
> On 2012-06-28 17:02, Peter Lieven wrote:
>> On 28.06.2012 15:25, Jan Kiszka wrote:
>>> 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.
>> can you explain shot what exactly these kicks do? does these kicks lead
>> to leaving the kernel mode and returning to userspace?
> Yes. A signal is sent, and KVM returns from the guest to userspace on
> pending signals.
is there a description available how this process exactly works?

thanks
peter