GICv3 is the ARM generic interrupt controller designed to overcome some limits of the prevalent GICv2. Most notably it lifts the 8-CPU limit. Though with recent patches from Marc there is support for hosts to use a GICv3, the CPU limitation still applies to KVM guests, since the current code emulates a GICv2 only. Also, GICv2 backward compatibility being optional in GICv3, a number of systems won't be able to run GICv2 guests. This patch series provides code to emulate a GICv3 distributor and redistributor for any KVM guest. It requires a GICv3 in the host to work. With those patches one can run guests efficiently on any GICv3 host. It has the following features: - Affinity routing (support for up to 255 VCPUs, more possible) - System registers (as opposed to MMIO access) - No ITS - No priority support (as the GICv2 emulation) - No save / restore support so far (will be added soon) The first 10 patches actually refactor the current VGIC code to make room for a different VGIC model to be dropped in with Patch 11/14. The remaining patches connect the new model to the kernel backend and the userland facing code. The series goes on top of both Marc's GICv3 host support series as well as his vgic-dyn patches. The necessary patches for kvmtool to enable the guest's GICv3 will be posted here as well. There was some testing on the fast model with some I/O and interrupt affinity shuffling in a Linux guest with a varying number of VCPUs. Please review and test. I would be grateful for people to test for GICv2 regressions also (so on a GICv2 host with current kvmtool/qemu), as there is quite some refactoring on that front. Much of the code was inspired by Marc, so send all praises to him (while I take the blame). Cheers, Andre. Andre Przywara (14): arm/arm64: KVM: rework MPIDR assignment and add accessors arm/arm64: KVM: pass down user space provided GIC type into vGIC code arm/arm64: KVM: refactor vgic_handle_mmio() function arm/arm64: KVM: wrap 64 bit MMIO accesses with two 32 bit ones arm/arm64: KVM: introduce per-VM ops arm/arm64: KVM: make the maximum number of vCPUs a per-VM value arm/arm64: KVM: make the value of ICC_SRE_EL1 a per-VM variable arm/arm64: KVM: refactor MMIO accessors arm/arm64: KVM: split GICv2 specific emulation code from vgic.c arm/arm64: KVM: add opaque private pointer to MMIO accessors arm/arm64: KVM: add virtual GICv3 distributor emulation arm/arm64: KVM: add SGI system register trapping arm/arm64: KVM: enable kernel side of GICv3 emulation arm/arm64: KVM: allow userland to request a virtual GICv3 arch/arm/include/asm/kvm_emulate.h | 2 +- arch/arm/include/asm/kvm_host.h | 3 + arch/arm/kvm/Makefile | 1 + arch/arm/kvm/arm.c | 23 +- arch/arm/kvm/coproc.c | 19 + arch/arm/kvm/psci.c | 15 +- arch/arm64/include/asm/kvm_emulate.h | 3 +- arch/arm64/include/asm/kvm_host.h | 5 + arch/arm64/include/uapi/asm/kvm.h | 7 + arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kvm/Makefile | 2 + arch/arm64/kvm/sys_regs.c | 37 +- arch/arm64/kvm/vgic-v3-switch.S | 14 +- include/kvm/arm_vgic.h | 38 +- include/linux/irqchip/arm-gic-v3.h | 26 + include/linux/kvm_host.h | 1 + include/uapi/linux/kvm.h | 1 + virt/kvm/arm/vgic-v2-emul.c | 802 +++++++++++++++++++++++++++ virt/kvm/arm/vgic-v2.c | 22 +- virt/kvm/arm/vgic-v3-emul.c | 898 ++++++++++++++++++++++++++++++ virt/kvm/arm/vgic-v3.c | 157 +++++- virt/kvm/arm/vgic.c | 1017 +++++++--------------------------- virt/kvm/arm/vgic.h | 117 ++++ virt/kvm/kvm_main.c | 3 + 24 files changed, 2346 insertions(+), 868 deletions(-) create mode 100644 virt/kvm/arm/vgic-v2-emul.c create mode 100644 virt/kvm/arm/vgic-v3-emul.c create mode 100644 virt/kvm/arm/vgic.h -- 1.7.9.5 -- 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
