From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49236) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fNzYI-0004mX-9y for qemu-devel@nongnu.org; Wed, 30 May 2018 07:46:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fNzYH-00059u-7q for qemu-devel@nongnu.org; Wed, 30 May 2018 07:46:02 -0400 From: Eric Auger Date: Wed, 30 May 2018 13:45:33 +0200 Message-Id: <1527680741-2725-1-git-send-email-eric.auger@redhat.com> Subject: [Qemu-devel] [RFC v3 0/8] KVM/ARM: Relax the max 123 vcpus limitation along with KVM GICv3 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org Cc: zhaoshenglong@huawei.com, christoffer.dall@arm.com, marc.zyngier@arm.com, drjones@redhat.com, wei@redhat.com 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. This second redistributor region has a capacity of 512 redistributors. The max supported VCPUs in non accelerated mode is not modified. Best Regards Eric Host Kernel dependencies: [1] [PATCH v6 00/12] KVM: arm/arm64: Allow multiple GICv3 redistributor regions https://github.com/eauger/linux/tree/v4.17-rc2-rdist-regions-v6 This QEMU series can be found at: https://github.com/eauger/qemu/tree/v2.12.0-rdist_regions-rfc-v3 Previous version: https://github.com/eauger/qemu/tree/v2.12.0-rdist_regions-rfc-v2 History: v2 -> v3: - Added the last patch defining 3.0 machine type and setting max_cpus to 512 - redistributor region total count exactly matching the number of requested vcpus - added missing return in arm_gic_realize - checked redist region capacity versus #vcpus earlier in gicv3_init_irqs_and_mmio - use GICV3_REDIST_SIZE - Changed the 2d region size to 64MB v1 -> v2: - Do not use KVM_MAX_VCPUS anymore - In case the multiple redistributor region capability is not supported by the host kernel, the GICv3 device realize() fails with a hint for the end-user. - use properties to set the redistributor region count - sysbus_mmio_map is kept in virt and machine init done notifier mechanism is used with an address fixup addition. - I have not yet extended the second redist region as Peter suggested. We can easily add another 3th region later on if requested. But if mandated, I will fix that in next release. Eric Auger (8): linux-headers: Partial update for KVM/ARM multiple redistributor region registration target/arm: Allow KVM device address overwriting hw/intc/arm_gicv3: Introduce redist-region-count array property hw/intc/arm_gicv3_kvm: Get prepared to handle multiple redist regions hw/arm/virt: GICv3 DT node with one or two redistributor regions hw/arm/virt-acpi-build: Advertise one or two GICR structures hw/arm/virt: Register two redistributor regions when necessary hw/arm/virt: Add virt-3.0 machine type supporting up to 512 vcpus hw/arm/virt-acpi-build.c | 9 ++++ hw/arm/virt.c | 88 ++++++++++++++++++++++++++++++++------ hw/intc/arm_gic_kvm.c | 4 +- hw/intc/arm_gicv3.c | 12 +++++- hw/intc/arm_gicv3_common.c | 38 +++++++++++++--- hw/intc/arm_gicv3_its_kvm.c | 2 +- hw/intc/arm_gicv3_kvm.c | 40 +++++++++++++++-- include/hw/arm/virt.h | 14 ++++++ include/hw/intc/arm_gicv3_common.h | 8 +++- linux-headers/asm-arm/kvm.h | 1 + linux-headers/asm-arm64/kvm.h | 1 + target/arm/kvm.c | 10 ++++- target/arm/kvm_arm.h | 3 +- 13 files changed, 200 insertions(+), 30 deletions(-) -- 2.5.5