Hello! > The series therefore allows and mandates the usage of KVM_SET_GSI_ROUTING > ioctl along with KVM_IRQFD. If the userspace does not define any routing > table, no irqfd injection can happen. The user-space can use > KVM_CAP_IRQ_ROUTING to detect whether a routing table is needed. Yesterday, half-sleeping in the train back home, i've got a simple idea how to resolve conflicts with existing static GSI->SPI routing without bringing in any more inconsistencies. So far, in current implementation GSI is an SPI index (let alone KVM_IRQ_LINE, because it's already another story on ARM). In order to maintain this convention we could simply implement default routing which sets all GSIs to corresponding SPI pins. So, if the userland never cares about KVM_SET_GSI_ROUTING, everything works as before. But it will be possible to re-route GSIs to MSI. It will perfectly work because SPI signaling is used with GICv2m, and MSI with GICv3(+), which cannot be used at the same time. Kind regards, Pavel Fedin Expert Engineer Samsung Electronics Research center Russia _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
