This series adds initial KVM RISC-V support. Currently, we are able to boot RISC-V 64bit Linux Guests with multiple VCPUs. Few key aspects of KVM RISC-V added by this series are: 1. Minimal possible KVM world-switch which touches only GPRs and few CSRs. 2. Full Guest/VM switch is done via vcpu_get/vcpu_put infrastructure. 3. KVM ONE_REG interface for VCPU register access from user-space. 4. PLIC emulation is done in user-space. In-kernel PLIC emulation, will be added in future. 5. Timer and IPI emuation is done in-kernel. 6. MMU notifiers supported. 7. FP lazy save/restore supported. 8. SBI v0.1 emulation for KVM Guest available. More feature additions and enhancments will follow after this series and eventually KVM RISC-V will be at-par with other architectures. This series is based upon KVM pre-patches sent by Atish earlier (https://lkml.org/lkml/2019/7/26/1271) and it can be found in riscv_kvm_v1 branch at: https//github.com/avpatel/linux.git Our work-in-progress KVMTOOL RISC-V port can be found in riscv_v1 branch at: https//github.com/avpatel/kvmtool.git We need OpenSBI with RISC-V hypervisor extension support which can be found in hyp_ext_changes_v1 branch at: https://github.com/riscv/opensbi.git The QEMU RISC-V hypervisor emulation is done by Alistair and is available in riscv-hyp-work.next branch at: https://github.com/alistair23/qemu.git To play around with KVM RISC-V, here are few reference commands: 1) To cross-compile KVMTOOL: $ make lkvm-static 2) To launch RISC-V Host Linux: $ qemu-system-riscv64 -monitor null -cpu rv64,h=true -M virt \ -m 512M -display none -serial mon:stdio \ -kernel opensbi/build/platform/qemu/virt/firmware/fw_jump.elf \ -device loader,file=build-riscv64/arch/riscv/boot/Image,addr=0x80200000 \ -initrd ./rootfs_kvm_riscv64.img \ -append "root=/dev/ram rw console=ttyS0 earlycon=sbi" 3) To launch RISC-V Guest Linux with 9P rootfs: $ ./apps/lkvm-static run -m 128 -c2 --console serial \ -p "console=ttyS0 earlycon=uart8250,mmio,0x3f8" -k ./apps/Image --debug 4) To launch RISC-V Guest Linux with initrd: $ ./apps/lkvm-static run -m 128 -c2 --console serial \ -p "console=ttyS0 earlycon=uart8250,mmio,0x3f8" -k ./apps/Image \ -i ./apps/rootfs.img --debug Anup Patel (13): KVM: RISC-V: Add KVM_REG_RISCV for ONE_REG interface RISC-V: Add hypervisor extension related CSR defines RISC-V: Add initial skeletal KVM support RISC-V: KVM: Implement VCPU create, init and destroy functions RISC-V: KVM: Implement VCPU interrupts and requests handling RISC-V: KVM: Implement KVM_GET_ONE_REG/KVM_SET_ONE_REG ioctls RISC-V: KVM: Implement VCPU world-switch RISC-V: KVM: Handle MMIO exits for VCPU RISC-V: KVM: Handle WFI exits for VCPU RISC-V: KVM: Implement VMID allocator RISC-V: KVM: Implement stage2 page table programming RISC-V: KVM: Implement MMU notifiers RISC-V: Enable VIRTIO drivers in RV64 and RV32 defconfig Atish Patra (3): RISC-V: KVM: Add timer functionality RISC-V: KVM: FP lazy save/restore RISC-V: KVM: Add SBI v0.1 support arch/riscv/Kconfig | 2 + arch/riscv/Makefile | 2 + arch/riscv/configs/defconfig | 23 +- arch/riscv/configs/rv32_defconfig | 13 + arch/riscv/include/asm/csr.h | 58 ++ arch/riscv/include/asm/kvm_host.h | 232 ++++++ arch/riscv/include/asm/kvm_vcpu_timer.h | 32 + arch/riscv/include/asm/pgtable-bits.h | 1 + arch/riscv/include/uapi/asm/kvm.h | 74 ++ arch/riscv/kernel/asm-offsets.c | 148 ++++ arch/riscv/kvm/Kconfig | 34 + arch/riscv/kvm/Makefile | 14 + arch/riscv/kvm/main.c | 64 ++ arch/riscv/kvm/mmu.c | 904 ++++++++++++++++++++++++ arch/riscv/kvm/tlb.S | 42 ++ arch/riscv/kvm/vcpu.c | 817 +++++++++++++++++++++ arch/riscv/kvm/vcpu_exit.c | 553 +++++++++++++++ arch/riscv/kvm/vcpu_sbi.c | 118 ++++ arch/riscv/kvm/vcpu_switch.S | 367 ++++++++++ arch/riscv/kvm/vcpu_timer.c | 106 +++ arch/riscv/kvm/vm.c | 107 +++ arch/riscv/kvm/vmid.c | 130 ++++ drivers/clocksource/timer-riscv.c | 6 + include/clocksource/timer-riscv.h | 14 + include/uapi/linux/kvm.h | 1 + 25 files changed, 3857 insertions(+), 5 deletions(-) create mode 100644 arch/riscv/include/asm/kvm_host.h create mode 100644 arch/riscv/include/asm/kvm_vcpu_timer.h create mode 100644 arch/riscv/include/uapi/asm/kvm.h create mode 100644 arch/riscv/kvm/Kconfig create mode 100644 arch/riscv/kvm/Makefile create mode 100644 arch/riscv/kvm/main.c create mode 100644 arch/riscv/kvm/mmu.c create mode 100644 arch/riscv/kvm/tlb.S create mode 100644 arch/riscv/kvm/vcpu.c create mode 100644 arch/riscv/kvm/vcpu_exit.c create mode 100644 arch/riscv/kvm/vcpu_sbi.c create mode 100644 arch/riscv/kvm/vcpu_switch.S create mode 100644 arch/riscv/kvm/vcpu_timer.c create mode 100644 arch/riscv/kvm/vm.c create mode 100644 arch/riscv/kvm/vmid.c create mode 100644 include/clocksource/timer-riscv.h -- 2.17.1
