On 16/09/2016 14:44, Alexander Graf wrote: > >> On 16 Sep 2016, at 14:40, Paolo Bonzini <pbonzini@xxxxxxxxxx> >> wrote: >> >> >> >> On 16/09/2016 14:29, Christoffer Dall wrote: >>>> It may be useful for migrating a gicv2 VM to a gicv3 host >>>> without gicv2 emulation as well. >>> >>> I don't see why you'd do this; the VGIC hardware can perfectly >>> well be used for nesting as well, and this works rather well. >> >> Can GICv3 emulate GICv2 in a guest? > > It depends on the gicv3 configuration. As an SOC vendor you can > either enable gicv2 compatibility or disable it. ThunderX for example > is gicv3 only. And QEMU complains on startup and exits, I hope. I am not too optimistic about having migration from kernel GIC to userspace GIC, honestly. But GICv2 emulation on GICv3-only hosts is a very reasonable thing to want, if only for testing/debugging purposes. Paolo -- 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
