Error setting VM mapped volumes

[kholisrag]

got below error when running on

• Macbook Pro M3 Pro
• macOS Sequioa 15.5 (24F74)

❯ krunvm start ubuntu /bin/bash
Error setting VM mapped volumes
❯ krunvm start ubuntu
Error setting VM mapped volumes

[walteh]

I have the same problem on my M1 Max, same macOS version - krunvm --version 0.2.3

[stephen-fox]

It looks like support for mapped volumes was dropped in libkrun by this commit in February 2024: libkrun/libkrun@186083d

That commit mentions using "multiple virtio-fs devices" instead. It appears krunvm still calls the deprecated function unconditionally, so it always fails even if the user does not configure any mapped volumes:

In krunvm:

#[cfg(target_os = "macos")]
fn map_volumes(ctx: u32, vmcfg: &VmConfig, rootfs: &str) {
    let mut volumes = Vec::new();
    for (host_path, guest_path) in vmcfg.mapped_volumes.iter() {
        // ...
    }

    // ...

    let ret = unsafe { bindings::krun_set_mapped_volumes(ctx, vols.as_ptr()) };
    if ret < 0 {
        println!("Error setting VM mapped volumes");
        std::process::exit(-1);
    }
}

... and in libkrun

pub unsafe extern "C" fn krun_set_mapped_volumes(
    _ctx_id: u32,
    _c_mapped_volumes: *const *const c_char,
) -> i32 {
    -libc::EINVAL
}