On 07/08/19 14:27, 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. Looks good to me! Still need an Acked-by from arch/riscv folks if I have to merge it, otherwise they can take care of the initial merge. Paolo > 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 can be found in riscv_kvm_v4 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 v3: > - Moved patch for ISA bitmap from KVM prep series to this series > - Make vsip_shadow as run-time percpu variable instead of compile-time > - Flush Guest TLBs on all Host CPUs whenever we run-out of VMIDs
