This series adds KVM LoongArch support. Loongson 3A5000 supports hardware assisted virtualization. With cpu virtualization, there are separate hw-supported user mode and kernel mode in guest mode. With memory virtualization, there are two-level hw mmu table for guest mode and host mode. Also there is separate hw cpu timer with consant frequency in guest mode, so that vm can migrate between hosts with different freq. Currently, we are able to boot LoongArch Linux Guests. Few key aspects of KVM LoongArch added by this series are: 1. Enable kvm hardware function when kvm module is loaded. 2. Implement VM and vcpu related ioctl interface such as vcpu create, vcpu run etc. GET_ONE_REG/SET_ONE_REG ioctl commands are use to get general registers one by one; KVM_GET_CSRS can be used to get system registers with batch mode similar with KVM_GET_MSRS in x86. 3. Hardware access about MMU, timer and csr are emulated in kernel. 4. Hardwares such as mmio and iocsr device are emulated in user space such as APIC, IPI, pci devices etc. The running environment of LoongArch virt machine: 1. Cross tools to build kernel and uefi: $ wget https://github.com/loongson/build-tools/releases/download/2022.09.06/loongarch64-clfs-6.3-cross-tools-gcc-glibc.tar.xz tar -vxf loongarch64-clfs-6.3-cross-tools-gcc-glibc.tar.xz -C /opt export PATH=/opt/cross-tools/bin:$PATH export LD_LIBRARY_PATH=/opt/cross-tools/lib:$LD_LIBRARY_PATH export LD_LIBRARY_PATH=/opt/cross-tools/loongarch64-unknown-linux-gnu/lib/:$LD_LIBRARY_PATH 2. This series is based on the linux source code: https://github.com/loongson/linux-loongarch-kvm Build command: git checkout kvm-loongarch make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- loongson3_defconfig make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- 3. QEMU hypervisor with LoongArch supported: https://github.com/loongson/qemu Build command: git checkout kvm-loongarch ./configure --target-list="loongarch64-softmmu" --enable-kvm make 4. Uefi bios of LoongArch virt machine: Reference: https://github.com/tianocore/edk2-platforms/tree/master/Platform/Loongson/LoongArchQemuPkg#readme 5. you can also access the binary files we have already build: https://github.com/yangxiaojuan-loongson/qemu-binary The command to boot loongarch virt machine: $ qemu-system-loongarch64 -machine virt -m 4G -cpu la464 \ -smp 1 -bios QEMU_EFI.fd -kernel vmlinuz.efi -initrd ramdisk \ -serial stdio -monitor telnet:localhost:4495,server,nowait \ -append "root=/dev/ram rdinit=/sbin/init console=ttyS0,115200" \ --nographic Tianrui Zhao (24): LoongArch: KVM: Implement kvm module related interface LoongArch: KVM: Implement VM related functions LoongArch: KVM: Implement vcpu create,run,destroy operations. LoongArch: KVM: Implement vcpu get, vcpu set registers LoongArch: KVM: Implement vcpu ENABLE_CAP, CHECK_EXTENSION ioctl interface LoongArch: KVM: Implement fpu related operations for vcpu LoongArch: KVM: Implement vcpu interrupt operations LoongArch: KVM: Implement misc vcpu related interfaces LoongArch: KVM: Implement vcpu load and vcpu put operations LoongArch: KVM: Implement vcpu status description LoongArch: KVM: Implement update VM id function LoongArch: KVM: Implement virtual machine tlb operations LoongArch: KVM: Implement vcpu timer operations LoongArch: KVM: Implement kvm mmu operations LoongArch: KVM: Implement handle csr excption LoongArch: KVM: Implement handle iocsr exception LoongArch: KVM: Implement handle idle exception LoongArch: KVM: Implement handle gspr exception LoongArch: KVM: Implement handle mmio exception LoongArch: KVM: Implement handle fpu exception LoongArch: KVM: Implement kvm exception vector LoongArch: KVM: Implement vcpu world switch LoongArch: KVM: Implement probe virtualization when loongarch cpu init LoongArch: KVM: Enable kvm config and add the makefile arch/loongarch/Kbuild | 1 + arch/loongarch/Kconfig | 2 + arch/loongarch/configs/loongson3_defconfig | 2 + arch/loongarch/include/asm/cpu-features.h | 22 + arch/loongarch/include/asm/cpu-info.h | 13 + arch/loongarch/include/asm/inst.h | 16 + arch/loongarch/include/asm/kvm_csr.h | 89 ++ arch/loongarch/include/asm/kvm_host.h | 257 +++++ arch/loongarch/include/asm/kvm_types.h | 11 + arch/loongarch/include/asm/kvm_vcpu.h | 112 ++ arch/loongarch/include/asm/loongarch.h | 195 +++- arch/loongarch/include/uapi/asm/kvm.h | 121 ++ arch/loongarch/kernel/asm-offsets.c | 32 + arch/loongarch/kernel/cpu-probe.c | 53 + arch/loongarch/kvm/Kconfig | 38 + arch/loongarch/kvm/Makefile | 21 + arch/loongarch/kvm/exit.c | 702 ++++++++++++ arch/loongarch/kvm/interrupt.c | 126 +++ arch/loongarch/kvm/main.c | 152 +++ arch/loongarch/kvm/mmu.c | 821 ++++++++++++++ arch/loongarch/kvm/switch.S | 327 ++++++ arch/loongarch/kvm/timer.c | 266 +++++ arch/loongarch/kvm/tlb.c | 31 + arch/loongarch/kvm/trace.h | 137 +++ arch/loongarch/kvm/vcpu.c | 1185 ++++++++++++++++++++ arch/loongarch/kvm/vm.c | 85 ++ arch/loongarch/kvm/vmid.c | 64 ++ include/uapi/linux/kvm.h | 15 + 28 files changed, 4890 insertions(+), 6 deletions(-) create mode 100644 arch/loongarch/include/asm/kvm_csr.h create mode 100644 arch/loongarch/include/asm/kvm_host.h create mode 100644 arch/loongarch/include/asm/kvm_types.h create mode 100644 arch/loongarch/include/asm/kvm_vcpu.h create mode 100644 arch/loongarch/include/uapi/asm/kvm.h create mode 100644 arch/loongarch/kvm/Kconfig create mode 100644 arch/loongarch/kvm/Makefile create mode 100644 arch/loongarch/kvm/exit.c create mode 100644 arch/loongarch/kvm/interrupt.c create mode 100644 arch/loongarch/kvm/main.c create mode 100644 arch/loongarch/kvm/mmu.c create mode 100644 arch/loongarch/kvm/switch.S create mode 100644 arch/loongarch/kvm/timer.c create mode 100644 arch/loongarch/kvm/tlb.c create mode 100644 arch/loongarch/kvm/trace.h create mode 100644 arch/loongarch/kvm/vcpu.c create mode 100644 arch/loongarch/kvm/vm.c create mode 100644 arch/loongarch/kvm/vmid.c -- 2.31.1
