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Date: Mon, 29 Jul 2019 23:47:45 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: Anup Patel <Anup.Patel@....com>,
Palmer Dabbelt <palmer@...ive.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Radim K <rkrcmar@...hat.com>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Atish Patra <Atish.Patra@....com>,
Alistair Francis <Alistair.Francis@....com>,
Damien Le Moal <Damien.LeMoal@....com>,
Christoph Hellwig <hch@...radead.org>,
Anup Patel <anup@...infault.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 00/16] KVM RISC-V Support
On 29/07/19 13:56, 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.
>
> More feature additions and enhancments will follow after this series and
> eventually KVM RISC-V will be at-par with other architectures.
This looks clean and it shouldn't take long to have it merged. Please
sort out the MAINTAINERS additions. It would also be nice if
tools/testing/selftests/kvm/ worked with RISC-V from the beginning;
there have been recent ARM and s390 ports that you can take some
inspiration from.
Paolo
> 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
>
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