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+<think>
+Okay, so I'm trying to figure out why my KVM/QEMU installation on POWER9 hardware isn't working properly. The error messages mention something about Transactional Memory (TM) and suggest that the host kernel doesn't support it for guests, which means I should disable HTM using cap-htm=off.
+
+First, I need to understand what's happening here. From the comments, it seems that when trying to start a virtual machine with Virt-manager, QEMU is throwing an error about KVM not supporting Transactional Memory on the host. This causes the installation or VM start to fail.
+
+Looking at the logs provided, Satheesh mentioned that they had a chat with Suraj, who explained that Power9 doesn't support HTM in guests right now. So any guest VM should be started with cap-htm=off. There's also a mention of a host kernel patch being worked on, which would fix this issue eventually.
+
+Another point is that libvirt isn't handling cap-htm yet; it doesn't set any defaults. So when starting the VM through libvirt, it might not pass the necessary flags to QEMU unless configured to do so.
+
+I see that some machine types like pseries-2.12 disable HTM by default, while others don't. If the current setup uses a different machine type (like pseries-bionic), it might require manually setting cap-htm=off or switching to a newer machine type that does this by default.
+
+So, what steps can I take to resolve this issue?
+
+1. **Check the Machine Type**: Determine which machine type my VM is using. If it's not pseries-2.12, maybe switching to that would help since HTM is off by default there.
+
+2. **Modify Libvirt Configuration**: Since libvirt doesn't handle cap-htm yet, I might need to modify the VM's configuration in libvirt XML files to include the cap-htm=off argument when starting QEMU.
+
+3. **Update Host Kernel**: If possible, apply the patch mentioned (https://www.spinics.net/lists/kvm-ppc/msg13378.html) to enable HTM support for guests on Power9. But this might be a future fix, not immediately available.
+
+4. **Pass cap-htm=off in CLI**: Alternatively, start the VM manually using the QEMU command line with cap-htm=off until libvirt is updated.
+
+I should also check if my current setup already uses pseries-2.12 or another machine type that supports disabling HTM by default. If not, changing the machine type might be necessary as an intermediate fix.
+
+Another thought: Perhaps Canonical needs to update their defaults for VMs so that by default, when using certain machine types on POWER9 hardware, cap-htm is set appropriately. Until then, manual configuration or applying patches might be required.
+
+In summary, the immediate fix seems to involve either changing the machine type to one where HTM is off by default (like pseries-2.12) or explicitly adding cap-htm=off to the QEMU command line when starting the VM through libvirt.
+</think>
+
+To address the issue of KVM/QEMU installation failure on POWER9 hardware due to unsupported Transactional Memory (TM), follow these steps:
+
+### Immediate Solutions:
+
+1. **Check and Modify Machine Type:**
+   - Ensure your virtual machine uses the `pseries-2.12` machine type, which disables HTM by default.
+   - If using another machine type like `pseries-bionic`, modify it to `pseries-2.12`.
+
+2. **Update Libvirt Configuration:**
+   - Edit the VM's XML configuration in libvirt to include `<qemu:commandline><qemu:arg value='-cap-htm=off'/></qemu:commandline>`.
+   - This ensures cap-htm is disabled when starting the VM.
+
+3. **Start VM with QEMU CLI:**
+   - Temporarily start the VM manually using the command line, including `cap-htm=off` until libvirt is updated:
+     ```bash
+     virsh --connect qemu:///system create --config /path/to/vm.xml \
+           --arg cap-htm=off
+     ```
+
+### Future Considerations:
+
+- **Host Kernel Update:** Once the host kernel patch enabling HTM support for guests is available, update your kernel and re-enable cap-htm if needed.
+- **Libvirt Update:** Monitor updates to libvirt that may automatically handle cap-htm settings based on hardware capabilities.
+
+By implementing these steps, you should resolve the installation failure due to unsupported TM and successfully run your VM on POWER9 hardware.
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