CODEWITHSUNDEEP
xv6
Kin Pu
Kin Pu

Reputation: 430

make qemu on xv6-riscv gets stucked at qemu-system-riscv64 ... command

On Ubuntu 20.04, I installed the xv6 project using the page Tools Used in 6.828

$ sudo apt-get install git build-essential gdb-multiarch qemu-system-misc gcc-riscv64-linux-gnu binutils-riscv64-linux-gnu

The file version that they checked on the web page are

$ riscv64-unknown-elf-gcc --version 
riscv64-unknown-elf-gcc () 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ qemu-system-riscv64 --version
QEMU emulator version 5.2.50 (v5.2.0-2349-g51db2d7cf2)
Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers

On xv6-riscv

$ make qemu
# ... lots of output ...
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

The program get stuck there. The vm is not booted and no prompt is shown.

Any ideas on how to fix this are welcomed.

Upvotes: 1

Views: 3929

Answers (2)

边凯泉
边凯泉

Reputation: 21

Code issue, pulling the 2020 version of XV6 code may cause this issue. My solution is to switch to a newer version of the code, such as the 2021 and 2022 versions,

git clone git://g.csail.mit.edu/xv6-labs-2021

Upvotes: 2

kamanphoebe
kamanphoebe

Reputation: 56

This has been mentioned in Tools Used in 6.S081

At this moment in time, it seems that the package qemu-system-misc has received an update that breaks its compatibility with our kernel. If you run make qemu and the script appears to hang after

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

you'll need to uninstall that package and install an older version:

$ sudo apt-get remove qemu-system-misc
$ sudo apt-get install qemu-system-misc=1:4.2-3ubuntu6

Upvotes: 2

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