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+<think>
+Alright, let's try to figure out what might be causing the issue with the QEMU command. The user provided a long and complex command that isn't working as expected, but when they tried a simpler version without any issues, it worked fine. So, I need to compare both commands to spot differences that could cause problems.
+
+First, looking at the working command: it's straightforward—just sets up a basic VM with 2GB RAM, an LA464 CPU, Virt machine type, two CPUs, uses the EDK2 BIOS, enables VNC on port 0, and adds a virtio-gpu-pci device. That works fine.
+
+Now, looking at the non-working command: it's much more detailed with numerous devices and configurations. Let me go through each part to see where things might be going wrong.
+
+The user included several PCIE root ports (pci.13 to pci.15) which might not be necessary if they're not being used elsewhere. Then there are various devices like the XHCI controller, SCSI, Virtio-Serial, USB tablet and keyboard, audio, GPU, sound, etc.
+
+I notice that the working command uses `-vnc` with port 0, but in the complex command, it's using both `-vnc` and `-spice`. Maybe there's a conflict between these two? QEMU might not handle both at the same time properly. Or perhaps the way they're configured is causing issues.
+
+Also, the complex command uses Virtio-GPU for display, which is good, but then adds Spice for graphical access. I should check if the Virtio-GPU and Spice can coexist without problems or if one requires exclusive use of certain devices.
+
+Another point is the inclusion of multiple buses and addresses. Maybe there's a bus collision or an address conflict causing some devices not to initialize correctly. For example, multiple devices might be trying to use the same bus or address space, leading to hardware errors during QEMU startup.
+
+The user also included Virtio-Serial for communication channels. If any of these serial ports aren't properly configured with matching endpoints in the guest OS, it could lead to problems. But that's more likely an issue within the VM rather than preventing QEMU from starting.
+
+Looking at the block device setup, they're using a file-based ISO image which should be fine as long as the path is correct. Maybe the path `/mnt/data/aosc-os_installer_20241122_loongarch64.iso` isn't accessible or the file is corrupted, but the user didn't mention that.
+
+The RNG and balloon devices seem standard, but if there's a misconfiguration there, it might not be the root cause. The security options like sandboxing are set to deny certain operations; maybe something in the VM requires those privileges, causing it to fail.
+
+I also notice network-related devices aren't mentioned, which is fine because they're using Virtio-GPU and other peripherals but no NIC. So that's probably not an issue here.
+
+Another angle: perhaps the order of device addition matters? In QEMU, adding devices in a certain sequence might be necessary for some hardware to function properly. Maybe the way they're being added in the complex command is causing conflicts.
+
+The user tried reproducing with a simple command and succeeded, which suggests that all dependencies are correctly set up on their system. So the problem must lie within the additional configurations in the longer command.
+
+To pinpoint, I could suggest removing some of the extra devices one by one to see where it breaks. For example, remove the spice-related commands first because they might be conflicting with VNC. If that works, then spice is part of the issue. Alternatively, check if both `-vnc` and `-spice` can coexist without conflict.
+
+Alternatively, maybe the way Virtio-GPU and Spice are being used together isn't compatible in this setup. Or perhaps the way the Virtio-Serial is configured with multiple channels is causing problems.
+
+I should also consider whether all the device IDs and bus addresses are unique. If any two devices share the same bus or address, that would cause hardware initialisation failures during QEMU startup.
+
+Another thought: Maybe the user didn't properly install or set up certain drivers in the guest OS for some of these devices, leading to issues after VM start, but since they're using Virtio devices which are usually well-supported, this might not be it unless the guest is misconfigured.
+
+In summary, the likely causes could be:
+
+1. **Conflict between VNC and Spice**: Using both graphical access methods might cause conflicts.
+2. **Device Address or Bus Conflicts**: Devices sharing the same bus or address space causing hardware initialisation errors.
+3. **Incorrect Configuration of Virtio-Serial or Other Devices**: Maybe some devices aren't properly configured, leading to failures during VM boot.
+
+To test these hypotheses:
+
+1. Remove Spice-related commands and only use VNC. If it works, then Spice might be the issue.
+2. Check all device IDs and bus addresses for uniqueness. Ensure no two devices share the same bus or address.
+3. Simplify the command by including fewer devices to isolate which one is causing the problem.
+
+By methodically reducing the command's complexity, the user can identify exactly where things go wrong, allowing them to fix the specific issue rather than guessing in the dark.
+</think>
+
+The issue with the QEMU command might be due to conflicts between different graphical access methods (VNC and Spice) or device configuration errors. Here's a step-by-step explanation:
+
+1. **Identify Potential Conflicts**:
+   - The complex command uses both `-vnc` and `-spice`, which may conflict as they both aim for graphical access.
+   - Ensure that only one graphical interface is used at a time.
+
+2. **Check Device Configuration**:
+   - Verify all device IDs (e.g., pci.13, pci.14) are unique to prevent address or bus conflicts.
+   - Remove any redundant devices like the PCIE root ports if they aren't needed.
+
+3. **Simplify the Command**:
+   - Use only the essential devices and gradually add others to isolate issues.
+
+**Step-by-Step Solution**:
+
+1. **Remove Spice Configuration**:
+   - Comment out or remove the `-vnc` and `-spice` lines and any related device configurations (e.g., Virtio-GPU) to use just one graphical method.
+
+2. **Verify Device Addresses**:
+   - Ensure each device has a unique bus and address. For example, devices like the XHCI controller should not share the same bus as others.
+
+3. **Test with Reduced Configuration**:
+   - Start the VM with only the necessary devices (BIOS, CPU, memory, Virtio-GPU) to see if it boots successfully.
+   - Gradually add other devices one by one to identify which one causes the failure.
+
+By systematically addressing these points, you can pinpoint the cause of the issue and adjust the command accordingly.
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