id = 2486
title = "RISC-V Regression: QEMU_CPU=f=false,zfinx=true gives misleading error message"
state = "closed"
created_at = "2024-08-06T18:03:57.819Z"
closed_at = "2024-10-03T09:31:50.207Z"
labels = ["target: riscv"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2486"
host-os = "Ubuntu 22.04.4 LTS (Jammy)"
host-arch = "x86"
qemu-version = "v9.1.0-rc0"
guest-os = "QEMU user mode"
guest-arch = "RISC-V"
description = """The f extension looks like it should be toggle-able using qemu_cpu since it doesn't throw error messages when specified.
Disabling the extension using f=false does not actually disable it as shown by the zfinx error message.
Eg. Unsupported extension is explicitly rejected
```
> QEMU_CPU=rv64,j=false ./qemu-riscv64 test.out
qemu-riscv64: can't apply global rv64-riscv-cpu.j=false: Property 'rv64-riscv-cpu.j' not found
```"""
reproduce = """1. Compile any riscv binary like: `int main() {}`
2. Execute using `QEMU_CPU=rv64,zfinx=true,f=false ./qemu-riscv64 test.out`"""
additional = "n/a"