我使用的环境是VMware虚拟机，系统为Ubuntu20.04
工具链
安装软件包
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| $ sudo apt-get install git build-essential gdb-multiarch qemu-system-misc gcc-riscv64-linux-gnu binutils-riscv64-linux-gnu
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这里有个需要注意的点是之后执行 make qemu 且脚本在
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| qemu-system-riscv64 -machine virt -bios none -kernel kernel/kernel -m 128M -smp 3 -nographic -drive file=fs.img，if=none，format=raw，id=x0 -device virtio-blk-device，drive=x0，bus=virtio-mmio-bus.0
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之后出现挂起，则需要卸载该软件包并安装旧版本：
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| $ sudo apt-get remove qemu-system-misc
$ sudo apt-get install qemu-system-misc=1:4.2-3ubuntu6
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这里我也遇到了此情况，但重装软件包后仍然挂起，后续检查发现是我的qemu版本太高，后面自己从官网下载了5.1.0版本后重新安装了qemu就能正常运行了
测试安装
若要测试安装，应能够检查以下内容：
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| $ riscv64-unknown-elf-gcc --version
riscv64-unknown-elf-gcc (GCC) 10.1.0
...
$ qemu-system-riscv64 --version
QEMU emulator version 5.1.0
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下载源码
我做的是2020年的lab
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| $ git clone git://g.csail.mit.edu/xv6-labs-2020
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下载后进入文件夹切换一个分支后，make qemu 后能正常运行即代表环境配置成功
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| $ cd xv6-labs-2020
$ git checkout util
$ make qemu
riscv64-unknown-elf-gcc -c -o kernel/entry.o kernel/entry.S
riscv64-unknown-elf-gcc -Wall -Werror -O -fno-omit-frame-pointer -ggdb -DSOL_UTIL -MD -mcmodel=medany -ffreestanding -fno-common -nostdlib -mno-relax -I. -fno-stack-protector -fno-pie -no-pie -c -o kernel/start.o kernel/start.c
...
riscv64-unknown-elf-ld -z max-page-size=4096 -N -e main -Ttext 0 -o user/_zombie user/zombie.o user/ulib.o user/usys.o user/printf.o user/umalloc.o
riscv64-unknown-elf-objdump -S user/_zombie > user/zombie.asm
riscv64-unknown-elf-objdump -t user/_zombie | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$/d' > user/zombie.sym
mkfs/mkfs fs.img README user/xargstest.sh user/_cat user/_echo user/_forktest user/_grep user/_init user/_kill user/_ln user/_ls user/_mkdir user/_rm user/_sh user/_stressfs user/_usertests user/_grind user/_wc user/_zombie
nmeta 46 (boot, super, log blocks 30 inode blocks 13, bitmap blocks 1) blocks 954 total 1000
balloc: first 591 blocks have been allocated
balloc: write bitmap block at sector 45
qemu-system-riscv64 -machine virt -bios none -kernel kernel/kernel -m 128M -smp 3 -nographic -drive file=fs.img,if=none,format=raw,id=x0 -device virtio-blk-device,drive=x0,bus=virtio-mmio-bus.0
xv6 kernel is booting
hart 2 starting
hart 1 starting
init: starting sh
$
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ctrl + A 松开后按 X 键退出 qemu
