Re: [PATCH RFE] conf: Add extraArgs option to passt backend

Add support for passing extra arguments to the passt binary through the domain XML configuration. This allows users to specify additional command-line arguments for passt that are not covered by existing structured fields. The new extraArgs attribute is added to the backend element: <backend type='passt' extraArgs='--debug --no-dhcp -v'/> The extraArgs string is parsed using g_shell_parse_argv() to split it into individual arguments before passing them to the passt command. This change includes: - New field in virDomainNetBackend structure - XML schema update to allow extraArgs attribute - Parsing and formatting support in domain_conf.c - Backend comparison function update - Memory cleanup for the new field - QEMU passt integration to use the extra arguments - Comprehensive tests for both user and vhostuser interfaces This is an RFE to gather feedback on the approach. I have a few questions for the community: 1. Is this general approach of adding extraArgs reasonable, or should we instead focus on adding specific structured fields for each passt option?

2. Should extraArgs be marked as unsupported/unstable in the documentation, with a clear indication that it's primarily intended for development and testing purposes?

3. Are there any security concerns with allowing arbitrary arguments to be passed to the passt binary via XML configuration?

4. Would it be better to validate the arguments against a known allowlist rather than allowing any argument string?