On Thu, Dec 01, 2022 at 11:06:50AM +0000, Marc Zyngier wrote: [...] > It would be a lot better to expose a virtual topology > (one set, one way, one level). It would also save us from the CCSIDRX > silliness. > > The only complexity would be to still accept different topologies from > userspace so that we can restore a VM saved before this virtual > topology. I generally agree that the reported topology is meaningless to non-secure software. However, with the cloud vendor hat on, I'm worried that inevitably some customer will inspect the cache topology of the VM we've provided them and complain. Could we extend your suggestion about accepting different topologies to effectively tolerate _any_ topology provided by userspace? KVM can default to the virtual topology, but a well-informed userspace could still provide different values to its guest. No point in trying to babyproofing the UAPI further, IMO. -- Thanks, Oliver _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
