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

From: Peter Lieven
Subject: Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop
Date: Thu, 28 Jun 2012 18:29:35 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110921 Thunderbird/3.1.15

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:

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?


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