On 01/03/18 13:32, David Hildenbrand wrote: > On 01.03.2018 11:05, Peter Maydell wrote: >> On 1 March 2018 at 09:50, Igor Mammedov <imammedo@xxxxxxxxxx> wrote: >>> In QEMU on x86 (and I think ppc, s390 as well), we create vCPUs on demand.>> >>> It would be nice if ARM would be able to do that too, >>> so that it could take advantage of the same code. >> >> It's not clear to me how that would work, given that for >> instance the interrupt controller wants to know up-front >> how many CPUs it has to deal with. >> > > So how is cpu hotplug handled in HW? Or doesn't it even exist there? I don't know of any physical system offering that facility. > (we have max_cpus for the interrupt controller, but not sure if that is > what we want) We'd need something along those lines. Each CPU has a notional point to point link to the interrupt controller (to the redistributor, to be precise), and this entity must pre-exist. Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
