Re: [Qemu-devel] [RFC PATCH] vl: fix migration when watchdog expires

[Paolo Bonzini]

On 14/08/2018 13:52, Dr. David Alan Gilbert wrote:
>  a) Should the watchdog expire when the VM is stopped; I think it
> shouldn't - hw/acpi/tco.c uses a virtual timer as does i6300esb; so
> is the bug here that the watchdog being used didn't use a virtual
> timer?

All watchdogs do.

>  b) If the watchdog expires just before the VM gets stopped, is there
> a race which could hit this?  Possibly.

Yes, I think it is a race that happens just before vm_stop, but I don't
understand why the "qemu_clock_enable" in pause_all_vcpus does not
prevent it.

It should be possible to write a deterministic testcase with qtest...

Paolo