Hi, These two patches enable support for vhost-net on RISC-V architecture. They are developed based on the Linux source in this repo: https://github.com/avpatel/linux, the branch is riscv_kvm_v13. The accompanying QEMU is from the repo: https://github.com/alistair23/qemu, the branch is hyp-ext-v0.6.next. In order for the QEMU to work with KVM, the patch found here is necessary: https://patchwork.kernel.org/cover/11435965/ Several steps to use this: 1. create virbr0 on riscv64 emulation $ brctl addbr virbr0 $ brctl stp virbr0 on $ ifconfig virbr0 up $ ifconfig virbr0 <virbr0_ip> netmask <virbr0_netmask> 2. boot riscv64 guestOS on riscv64 emulation $ ./qemu-system-riscv64 -M virt,accel=kvm -m 1024M -cpu host -nographic \ -name guest=riscv-guest \ -smp 2 \ -kernel ./Image \ -drive file=./guest.img,format=raw,id=hd0 \ -device virtio-blk,drive=hd0 \ -netdev type=tap,vhost=on,script=./ifup.sh,downscript=./ifdown.sh,id=net0 \ -append "root=/dev/vda rw console=ttyS0 earlycon=sbi" $ cat ifup.sh #!/bin/sh brctl addif virbr0 $1 ifconfig $1 up $ cat ifdown.sh #!/bin/sh ifconfig $1 down brctl delif virbr0 $1 This brenchmark is vhost-net compare with virtio: $ ./netperf -H <virbr0_ip> -l 100 -t TCP_STREAM vhost-net: Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 100.07 457.55 virtio: Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 100.07 227.02 The next step is to support irqfd on RISC-V architecture. Yifei Jiang (2): RISC-V: KVM: enable ioeventfd capability and compile for risc-v RISC-V: KVM: read\write kernel mmio device support arch/riscv/kvm/Kconfig | 2 ++ arch/riscv/kvm/Makefile | 2 +- arch/riscv/kvm/vcpu_exit.c | 38 ++++++++++++++++++++++++++++++++------ arch/riscv/kvm/vm.c | 1 + 4 files changed, 36 insertions(+), 7 deletions(-) -- 2.19.1
