id = 1633
title = "[8.0.0] Broken icount support on RISC-V"
state = "closed"
created_at = "2023-04-29T23:43:28.353Z"
closed_at = "2023-05-03T02:23:00.885Z"
labels = ["target: riscv"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1633"
host-os = "macOS 13.3.1"
host-arch = "x86_64"
qemu-version = "8.0.0"
guest-os = "Ubuntu"
guest-arch = "RISC-V 64-bit"
description = """After https://gitlab.com/qemu-project/qemu/-/commit/5a4ae64cac49564354cd6f17598840e4af70e4f5 was merged, RISC-V VMs no longer run with -icount 1 specified in the QEMU arguments. Reverting this commit resolves the issue."""
reproduce = """1. Download preinstalled Ubuntu 22.04.2 image from [here](https://cdimage.ubuntu.com/releases/22.04.2/release/ubuntu-22.04.2-preinstalled-server-riscv64+unmatched.img.xz)
2. Download uboot from [here](http://security.ubuntu.com/ubuntu/pool/main/u/u-boot/u-boot-qemu_2022.01+dfsg-2ubuntu2.3_all.deb)
3. Extract both.
4. Run with the command-line specified above."""
additional = """Reading Ubuntu wiki describing how to run RISC-V VMs can help: https://wiki.ubuntu.com/RISC-V/QEMU

Full output:

```
% qemu-system-riscv64 \\                     
-machine virt -nographic -m 2048 -smp 4 \\
-kernel u-boot/qemu-riscv64_smode/uboot.elf \\
-device virtio-net-device,netdev=eth0 -netdev user,id=eth0 \\
-drive file=ubuntu-22.04.2-preinstalled-server-riscv64+unmatched.img,format=raw,if=virtio -icount 1

OpenSBI v1.2
   ____                    _____ ____ _____
  / __ \\                  / ____|  _ \\_   _|
 | |  | |_ __   ___ _ __ | (___ | |_) || |
 | |  | | '_ \\ / _ \\ '_ \\ \\___ \\|  _ < | |
 | |__| | |_) |  __/ | | |____) | |_) || |_
  \\____/| .__/ \\___|_| |_|_____/|____/_____|
        | |
        |_|

Platform Name             : riscv-virtio,qemu
Platform Features         : medeleg
Platform HART Count       : 4
Platform IPI Device       : aclint-mswi
Platform Timer Device     : aclint-mtimer @ 10000000Hz
Platform Console Device   : uart8250
Platform HSM Device       : ---
Platform PMU Device       : ---
Platform Reboot Device    : sifive_test
Platform Shutdown Device  : sifive_test
Firmware Base             : 0x80000000
Firmware Size             : 236 KB
Runtime SBI Version       : 1.0

Domain0 Name              : root
Domain0 Boot HART         : 0
Domain0 HARTs             : 0*,1*,2*,3*
Domain0 Region00          : 0x0000000002000000-0x000000000200ffff (I)
Domain0 Region01          : 0x0000000080000000-0x000000008003ffff ()
Domain0 Region02          : 0x0000000000000000-0xffffffffffffffff (R,W,X)
Domain0 Next Address      : 0x0000000080200000
Domain0 Next Arg1         : 0x00000000bfe00000
Domain0 Next Mode         : S-mode
Domain0 SysReset          : yes

Boot HART ID              : 0
Boot HART Domain          : root
Boot HART Priv Version    : v1.12
Boot HART Base ISA        : rv64imafdch
Boot HART ISA Extensions  : time,sstc
Boot HART PMP Count       : 16
Boot HART PMP Granularity : 4
Boot HART PMP Address Bits: 54
Boot HART MHPM Count      : 16
Boot HART MIDELEG         : 0x0000000000001666
Boot HART MEDELEG         : 0x0000000000f0b509
qemu-system-riscv64: Bad icount read
```"""