Hi, On 04/27/2018 04:06 PM, Eric Auger wrote: > At the moment the KVM VGICv3 only supports a single redistributor > region (whose base address is set through the GICv3 kvm device > KVM_DEV_ARM_VGIC_GRP_ADDR/KVM_VGIC_V3_ADDR_TYPE_REDIST). There, > all the redistributors are laid out contiguously. The size of this > single redistributor region is not set explicitly but instead > induced at a late stage by the number of online vcpus. > > The GIC specification does not mandate all redistributors to be > contiguous. Moreover DT and ACPI were specified so that multiple > redistributors regions can be defined. > > The current interface brings a limitation on QEMU where ARM > virt machine available GPA holes only allowed to assign a > redistributor region fitting a max of 123 vcpus. Overcoming this > limitation would force either to create a new machine or relocate > the single rdist region or allow the allocation of multiple rdist > regions. > > This series enables this last alternative. A new GICv3 KVM device > KVM_DEV_ARM_VGIC_GRP_ADDR/KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION allows > to register individual redistributor regions whose size is defined > explicitly. Those rdist regions then are filled by vcpu rdist frames > according to the need. The vgic init and related base address checks > are impacted. For some unknown reason I got a timeout on the git send-email command, hence this isolated cover letter. The series was fully resent. Sorry for the inconvenience. Thanks Eric > > Best Regards > > Eric > > Git: complete series available at > https://github.com/eauger/linux/tree/v4.17-rc2-rdist-regions-v4 > Previous version: > https://github.com/eauger/linux/tree/v4.16-rdist-regions-v3 > > History: > > v3 -> v4: > - Collected Christoffer's R-b > - reworked vgic_v3_rdist_overlap and introduced vgic_dist_overlap > - vgic_v3_insert_redist_region cleanup > - inverse order for patches 6 and 7 > > v2 -> v3: > - Add details to the user API documentation > - early exit if vgic_v3_rdist_region_from_index() fails > - return -EINVAL if legacy and new redist region API are mixed > > v1 -> v2: > - Rework the uapi. Only bits [51:16] of the redist region are > exposed. Also a new flags field was introduced > - Do not store the last bit in the vgic_cpu struct anymore > - remove dist->spis check in 1st patch > - add last patch to bump VGIC_V3_MAX_CPUS to 512 > - advertise the new attribute > > Eric Auger (12): > KVM: arm/arm64: Set dist->spis to NULL after kfree > KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION > KVM: arm/arm64: Replace the single rdist region by a list > KVM: arm/arm64: Helper to locate free rdist index > KVM: arm/arm64: Revisit Redistributor TYPER last bit computation > KVM: arm/arm64: Adapt vgic_v3_check_base to multiple rdist regions > KVM: arm/arm64: Helper to register a new redistributor region > KVM: arm/arm64: Check vcpu redist base before registering an iodev > KVM: arm/arm64: Check all vcpu redistributors are set on map_resources > KVM: arm/arm64: Add KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION > KVM: arm/arm64: Implement KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION > KVM: arm/arm64: Bump VGIC_V3_MAX_CPUS to 512 > > Documentation/virtual/kvm/devices/arm-vgic-v3.txt | 25 ++++- > arch/arm/include/uapi/asm/kvm.h | 1 + > arch/arm64/include/uapi/asm/kvm.h | 1 + > include/kvm/arm_vgic.h | 16 ++- > virt/kvm/arm/vgic/vgic-init.c | 20 +++- > virt/kvm/arm/vgic/vgic-kvm-device.c | 55 ++++++++++- > virt/kvm/arm/vgic/vgic-mmio-v3.c | 114 +++++++++++++++++++--- > virt/kvm/arm/vgic/vgic-v3.c | 101 +++++++++++++++---- > virt/kvm/arm/vgic/vgic.h | 42 +++++++- > 9 files changed, 330 insertions(+), 45 deletions(-) >
