On Mon, Jun 29, 2015 at 05:37:10PM +0200, Eric Auger wrote: > 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. Do you mean GICv3 ITS here? > > 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
