Error setting VM mapped volumes #67

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1. walteh commented on May 25, 2025

   

   walteh

   on May 25, 2025

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

   👍React with 👍2Reacted by Kholis Respati Agum Gumelar and Zachary Heller
2. stephen-fox commented on Jun 8, 2025

   

   stephen-fox

   on Jun 8, 2025

   Last edited by stephen-fox

   Contributor

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   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
   }