> > > Note that platform must set a flag to declare MSI supported. > > > For PC this will be set by APIC. > > > > This sounds wrong. The device shouldn't know or care whether the system > > has a MSI capable interrupt controller. That's for the guest OS to figure > > out. > > You are right of course. In theory there's nothing that breaks if I > set this flag to on, on all platforms. OTOH if qemu emulates some > controller incorrectly, guest might misdetect MSI support in the > controller, and things will break horribly. > > It seems safer to have a flag that can be enabled by people > that know about a specific platform. No. The solution is to fix whatever is broken. If we really need to avoid MSI-X capable devices then that should be done explicity per-device. i.e. you have a different virtio-net device that does not use MSI-X. Paul -- 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
