libvirt_pcicontr: add func for pcie-root

[dzhengfy]

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[gemini-code-assist]

Summary of Changes

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This pull request introduces a new helper function designed to streamline the process of identifying the PCIe root controller in a virtual machine's Libvirt XML definition. This enhancement aims to simplify subsequent operations that require interaction with or information about the primary PCIe bus, improving the utility's robustness when dealing with PCI device management.

Highlights

• New Utility Function: Added a new function, get_pcie_root, to libvirt_pcicontr.py which is responsible for finding and returning the index of the pcie-root controller within a virtual machine's XML configuration. If not found, it logs a warning and returns -1.

Changelog

• virttest/utils_libvirt/libvirt_pcicontr.py
  • Added get_pcie_root function to locate the index of the pcie-root controller in VM XML.

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[gemini-code-assist]

Code Review

This pull request introduces a new utility function get_pcie_root to find the pcie-root controller in a VM's XML definition. The implementation has a potential bug where it returns the list index instead of the controller's XML index attribute. I've suggested a fix to correct this and to make the loop more Pythonic.