From patchwork Fri Jul 24 08:54:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yifei Jiang X-Patchwork-Id: 11682733 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 09C45913 for ; Fri, 24 Jul 2020 08:55:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE20A2065C for ; Fri, 24 Jul 2020 08:55:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726979AbgGXIzf (ORCPT ); Fri, 24 Jul 2020 04:55:35 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:54784 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726554AbgGXIzf (ORCPT ); Fri, 24 Jul 2020 04:55:35 -0400 Received: from DGGEMS401-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id D3DA38FE8846B0F92B8C; Fri, 24 Jul 2020 16:55:33 +0800 (CST) Received: from huawei.com (10.174.187.31) by DGGEMS401-HUB.china.huawei.com (10.3.19.201) with Microsoft SMTP Server id 14.3.487.0; Fri, 24 Jul 2020 16:55:27 +0800 From: Yifei Jiang To: , , , CC: , , , , , , , , , , , Yifei Jiang Subject: [RFC 0/2] Add risc-v vhost-net support Date: Fri, 24 Jul 2020 16:54:39 +0800 Message-ID: <20200724085441.1514-1-jiangyifei@huawei.com> X-Mailer: git-send-email 2.26.2.windows.1 MIME-Version: 1.0 X-Originating-IP: [10.174.187.31] X-CFilter-Loop: Reflected Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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 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 -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(-)