With the advent of GICv3 ITS in-kernel emulation, KVM GSI routing appears to be requested. More specifically MSI routing is needed. irqchip routing does not sound to be really useful on arm but usage of MSI routing also mandates to integrate irqchip routing. The initial implementation of irqfd on arm must be upgraded with the integration of kvm irqchip.c code and the implementation of its standard hooks in the architecture specific part. In case KVM_SET_GSI_ROUTING ioctl is not called, a default routing table with flat irqchip routing entries is built enabling to inject gsi corresponding to the SPI indexes seen by the guest. As soon as KVM_SET_GSI_ROUTING is called, user-space overwrites this default routing table and is responsible for building the whole routing table. for arm/arm64 KVM_SET_GSI_ROUTING has a limited support: - only applies to KVM_IRQFD and not to KVM_IRQ_LINE - irqchip routing was tested on Calxeda midway (VFIO with irqfd) - MSI routing without GICv3 ITS was tested using APM Xgene-I (qemu VIRTIO-PCI vhost net without gsi_direct_mapping). - MSI routing with GICv2 ITS is NOT yet tested. Code can be found at https://git.linaro.org/people/eric.auger/linux.git/shortlog/refs/heads/v4.1-gsi-routing-patch It applies on Andre's [PATCH 00/13] arm64: KVM: GICv3 ITS emulation (http://www.spinics.net/lists/kvm/msg117402.html) History: RFC -> PATCH: - clearly state limited support on arm/arm64: KVM_IRQ_LINE not impacted by GSI routing - add default routing table feature (new patch file) - changed uapi to use padding field area - reword api.txt Eric Auger (7): KVM: api: add kvm_irq_routing_extended_msi KVM: kvm_host: add kvm_extended_msi KVM: irqchip: convey devid to kvm_set_msi KVM: arm/arm64: enable irqchip routing KVM: arm/arm64: build a default routing table KVM: arm/arm64: enable MSI routing KVM: arm: implement kvm_set_msi by gsi direct mapping Documentation/virtual/kvm/api.txt | 30 ++++++++-- arch/arm/include/asm/kvm_host.h | 2 + arch/arm/kvm/Kconfig | 3 + arch/arm/kvm/Makefile | 2 +- arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/Kconfig | 2 + arch/arm64/kvm/Makefile | 2 +- include/kvm/arm_vgic.h | 9 --- include/linux/kvm_host.h | 10 ++++ include/uapi/linux/kvm.h | 6 +- virt/kvm/arm/vgic.c | 117 ++++++++++++++++++++++++++++---------- virt/kvm/irqchip.c | 20 +++++-- 12 files changed, 154 insertions(+), 50 deletions(-) -- 1.9.1 -- 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
