Currently the max number of VCPUs usable along with the KVM GICv3 device is limited to 123. The rationale is a single redistributor region was supported and this latter was set to [0x80A0000, 0x9000000] within the guest physical address space, surrounded with DIST and UART MMIO regions.
[1] now allows to register several redistributor regions. So this series overcomes the max 123 vcpu limitation by registering a new redistributor region located just after the VIRT_MEM RAM region. The total redistributor region capacity is set to 512 vcpus. The max supported VCPUs in non accelerated mode is not modified. Best Regards Eric Host Kernel dependencies: [1] [RFC v2 00/12] KVM: arm/arm64: Allow multiple GICv3 redistributor regions https://github.com/eauger/linux/tree/4.16-rc7-rdist-regions-rfc-v2 This QEMU series can be found at: https://github.com/eauger/qemu/tree/v2.12.0-rc0-rdist_regions-rfc Eric Auger (8): linux-headers: Partial update for KVM/ARM multiple redistributor region registration hw/intc/arm_gicv3: Use an array of redistributor regions kvm: Expose kvm_max_vcpus() hw/intc/arm_gicv3: Implement register_redist_region API hw/intc/arm_gicv3_kvm: Allow multiple redistributor regions hw/arm/virt: Allow GICv3 DT node with multiple redistributor regions hw/arm/virt-acpi-build: Handle multiple GICR structures hw/arm/virt: Allow up to 512 vcpus along with KVM VGICv3 accel/kvm/kvm-all.c | 2 +- accel/stubs/kvm-stub.c | 5 ++++ hw/arm/virt-acpi-build.c | 21 ++++++++++---- hw/arm/virt.c | 55 +++++++++++++++++++++++++++++++----- hw/intc/arm_gicv3.c | 21 ++++++++++++++ hw/intc/arm_gicv3_common.c | 9 ++++-- hw/intc/arm_gicv3_kvm.c | 57 ++++++++++++++++++++++++++++++++++++-- include/hw/arm/virt.h | 3 ++ include/hw/intc/arm_gicv3_common.h | 14 +++++++++- include/sysemu/kvm.h | 7 +++++ linux-headers/asm-arm/kvm.h | 7 +++-- linux-headers/asm-arm64/kvm.h | 7 +++-- 12 files changed, 182 insertions(+), 26 deletions(-) -- 2.5.5