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SubjectRe: [RFC PATCH v2 00/19] KVM RISC-V Support
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On 02/08/19 09:46, 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/2019/7/31/1503) and it can be found in
> riscv_kvm_v2 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

LGTM apart from the comments I've sent about locking---which was the
focus of my review this time through---and the bug on reading VSIP).

Please try to have your GPG key signed by some other Linux maintainers
so that you can use signed pull requests for RISC-V KVM.

Paolo

> 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
>
> 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 | 23 +-
> arch/riscv/configs/rv32_defconfig | 13 +
> arch/riscv/include/asm/csr.h | 58 ++
> arch/riscv/include/asm/kvm_host.h | 228 ++++++
> 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 | 84 +++
> arch/riscv/kvm/mmu.c | 904 +++++++++++++++++++++++
> arch/riscv/kvm/tlb.S | 43 ++
> arch/riscv/kvm/vcpu.c | 936 ++++++++++++++++++++++++
> arch/riscv/kvm/vcpu_exit.c | 554 ++++++++++++++
> 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 | 124 ++++
> drivers/clocksource/timer-riscv.c | 8 +
> include/clocksource/timer-riscv.h | 16 +
> include/uapi/linux/kvm.h | 1 +
> 28 files changed, 4009 insertions(+), 6 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
>

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