On Mon, 2019-08-05 at 18:05 +0200, Paolo Bonzini wrote: > On 05/08/19 15:42, Anup Patel wrote: > > 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. > > > > Here's a brief TODO list which we will work upon after this series: > > 1. Handle trap from unpriv access in reading Guest instruction > > 2. Handle trap from unpriv access in SBI v0.1 emulation > > 3. Implement recursive stage2 page table programing > > 4. SBI v0.2 emulation in-kernel > > 5. SBI v0.2 hart hotplug emulation in-kernel > > 6. In-kernel PLIC emulation > > 7. ..... and more ..... > > > > This series is based upon KVM pre-patches sent by Atish earlier > > (https://lkml.org/lkml/2019/8/3/3) and it can be found in > > riscv_kvm_v3 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 > > > > Changes since v2: > > - Removed references of KVM_REQ_IRQ_PENDING from all patches > > - Use kvm->srcu within in-kernel KVM run loop > > - Added percpu vsip_shadow to track last value programmed in VSIP > > CSR > > - Added comments about irqs_pending and irqs_pending_mask > > - Used kvm_arch_vcpu_runnable() in-place-of > > kvm_riscv_vcpu_has_interrupt() > > in system_opcode_insn() > > - Removed unwanted smp_wmb() in kvm_riscv_stage2_vmid_update() > > - Use kvm_flush_remote_tlbs() in kvm_riscv_stage2_vmid_update() > > - Use READ_ONCE() in kvm_riscv_stage2_update_hgatp() for vmid > > > > Changes since v1: > > - Fixed compile errors in building KVM RISC-V as module > > - Removed unused kvm_riscv_halt_guest() and > > kvm_riscv_resume_guest() > > - Set KVM_CAP_SYNC_MMU capability only after MMU notifiers are > > implemented > > - Made vmid_version as unsigned long instead of atomic > > - Renamed KVM_REQ_UPDATE_PGTBL to KVM_REQ_UPDATE_HGATP > > - Renamed kvm_riscv_stage2_update_pgtbl() to > > kvm_riscv_stage2_update_hgatp() > > - Configure HIDELEG and HEDELEG in kvm_arch_hardware_enable() > > - Updated ONE_REG interface for CSR access to user-space > > - Removed irqs_pending_lock and use atomic bitops instead > > - Added separate patch for FP ONE_REG interface > > - Added separate patch for updating MAINTAINERS file > > Down to one comment, which can be addressed when applying (though I'd > prefer if you tested the one-token fix). > > Palmer, Albert, can you give your Acked-by, especially for patches > 2-3-18-19? > We also need following pre-equisite patches to be reviewed and kvm series should be merged on top of it. https://patchwork.kernel.org/project/linux-riscv/list/?series=154889 At least we need 1 & 2 from above series for kvm series to work. Regards, Atish > Thanks, > > Paolo > > > Anup Patel (14): > > 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 > > RISC-V: KVM: Add MAINTAINERS entry > > > > Atish Patra (5): > > RISC-V: Export few kernel symbols > > RISC-V: KVM: Add timer functionality > > RISC-V: KVM: FP lazy save/restore > > RISC-V: KVM: Implement ONE REG interface for FP registers > > RISC-V: KVM: Add SBI v0.1 support > > > > MAINTAINERS | 10 + > > arch/riscv/Kconfig | 2 + > > arch/riscv/Makefile | 2 + > > arch/riscv/configs/defconfig | 13 + > > arch/riscv/configs/rv32_defconfig | 13 + > > arch/riscv/include/asm/csr.h | 58 ++ > > arch/riscv/include/asm/kvm_host.h | 243 ++++++ > > arch/riscv/include/asm/kvm_vcpu_timer.h | 32 + > > arch/riscv/include/asm/pgtable-bits.h | 1 + > > arch/riscv/include/uapi/asm/kvm.h | 98 +++ > > arch/riscv/kernel/asm-offsets.c | 148 ++++ > > arch/riscv/kernel/smp.c | 2 +- > > arch/riscv/kernel/time.c | 1 + > > arch/riscv/kvm/Kconfig | 34 + > > arch/riscv/kvm/Makefile | 14 + > > arch/riscv/kvm/main.c | 86 +++ > > arch/riscv/kvm/mmu.c | 905 > > ++++++++++++++++++++++ > > arch/riscv/kvm/tlb.S | 43 ++ > > arch/riscv/kvm/vcpu.c | 969 > > ++++++++++++++++++++++++ > > arch/riscv/kvm/vcpu_exit.c | 556 ++++++++++++++ > > arch/riscv/kvm/vcpu_sbi.c | 119 +++ > > arch/riscv/kvm/vcpu_switch.S | 368 +++++++++ > > arch/riscv/kvm/vcpu_timer.c | 106 +++ > > arch/riscv/kvm/vm.c | 86 +++ > > arch/riscv/kvm/vmid.c | 111 +++ > > drivers/clocksource/timer-riscv.c | 8 + > > include/clocksource/timer-riscv.h | 16 + > > include/uapi/linux/kvm.h | 1 + > > 28 files changed, 4044 insertions(+), 1 deletion(-) > > 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 > >
