On Mon, Jun 20, 2011 at 08:23:20PM +0300, Avi Kivity wrote: > On 06/20/2011 08:13 PM, Jan Kiszka wrote: > >> A watchdog has the advantage that is also detects lockups. > >> > >> In fact you could implement the panic device via the existing > >> watchdogs. Simply program the timer for the minimum interval and > >> *don't* service the interrupt. This would work for non-virt setups as > >> well as another way to issue a reset. > > > >If you manage to bring down the other guest CPUs fast enough. Otherwise, > >they may corrupt your crashdump before the host had a chance to collect > >all pieces. Synchronous signaling to the hypervisor is a bit safer. > > You could NMI-IPI them. But I agree a synchronous signal is better > (note it's not race-free itself). > But kexec/kdump has exactly same race, so this is at least not worse that alternative. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
