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+<think>
+Okay, I'm trying to figure out how to fix this bug where using the -cpu Broadwell or Haswell option in QEMU doesn't set the MONITOR/MWAIT feature. From what I understand, the user is encountering issues because these CPUs aren't having their features correctly emulated, specifically the MONITOR bit isn't being included in the CPUID features.
+
+First, looking at the bug report, the user ran QEMU with a Broadwell CPU and noticed that the MONITOR flag was missing. This causes NetBSD to fallback into a check-and-pause loop because it's expecting the MONITOR feature but doesn't get it.
+
+I also see that there are several warnings about TCG not supporting certain features like FMA, PCID, X2APIC, etc. It seems like QEMU isn't emulating all the required CPU features for Broadwell and Haswell processors correctly.
+
+I remember that the MONITOR instruction is part of the MWAIT/monitor extensions. So if the feature isn't present in the emulated CPU, any code relying on it (like NetBSD) will fail. I need to check how QEMU handles these features when selecting a specific CPU model like Broadwell or Haswell.
+
+Looking into QEMU's documentation and source code might help. I think the issue lies in how the CPU models are defined in QEMU. Maybe the current setup for Broadwell/Haswell CPUs doesn't include MONITOR by default, but it should be enabled if the host supports it.
+
+I should look at the CPU definitions in QEMU, specifically for Haswell and Broadwell. If MONITOR isn't set as a feature, that's probably why it's missing. I need to find where these features are defined and ensure that MONITOR is included when appropriate.
+
+Additionally, the warnings about TCG not supporting certain features suggest that QEMU is trying to emulate them but can't because of limitations in TCG (the translation approach used by QEMU). This might be why some features aren't being emulated properly. Maybe using a different emulator like KVM could help, but if the issue is specific to feature reporting, then it's more about how the CPUID is being generated.
+
+I should also consider whether this bug has been addressed in newer versions of QEMU. The user mentioned a commit from 2020 that might have fixed similar issues. I'll check the QEMU repository around that time to see if there were any changes related to CPU feature reporting for Broadwell and Haswell models.
+
+If the issue hasn't been resolved, perhaps I can look into how other CPU features are added and ensure that MONITOR is included correctly. Maybe adding a test case where MONITOR is enabled in the CPUID would help catch this issue in the future.
+
+Another approach could be to look at the CPUID output generated by QEMU when running with Broadwell/Haswell CPUs. Comparing it against a real CPU's output might highlight missing features that need to be added to the emulation.
+
+In summary, I'll check QEMU's source code for how these CPUs are defined, ensure all necessary features (including MONITOR) are included, and test if newer versions have already fixed this issue or if I need to patch it myself.
+</think>
+
+To address the issue where QEMU's Broadwell/Haswell CPU models lack the MONITOR/MWAIT feature, follow these steps:
+
+1. **Update QEMU**: Ensure you're using the latest version of QEMU as features might have been updated or bugs fixed in newer releases.
+
+2. **Check CPU Definitions**: Look into `qemu`'s source code, specifically in files like `cpu.hx` or similar where CPU models are defined for Broadwell and Haswell. Verify if MONITOR is included in the feature list.
+
+3. **Enable MONITOR Feature**: Modify the CPU model definitions to include the MONITOR/MWAIT feature if it's not already present.
+
+4. **Recompile QEMU**: After making changes, recompile QEMU to apply the fixes.
+
+5. **Test with Monitor Flag**: Run your VM with `-cpu Broadwell,+monitor` or similar options to ensure the feature is recognized.
+
+6. **Check CPUID Output**: Use tools like `cpuid` within the guest OS to confirm that MONITOR is now present in the CPU features.
+
+**Example Command:**
+```bash
+qemu-system-x86_64 -cpu Broadwell,+monitor -enable-kvm ...
+```
+
+By following these steps, you ensure QEMU correctly reports the MONITOR feature for Haswell and Broadwell CPUs, resolving the issue.
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