Fix a timeout problem in the block_check_memory_leak test on s390x

[huth]

Since valgrind is instrumenting the application (memory accesses are examined, and the binary code of the application is JIT recompiled), this can cause massive slowdowns of QEMU. On s390x, when the guest is configured with a virtio-gpu device and the guest is writing its boot messages to that device, too (i.e. when Plymouth in the guest writes all boot messages to the graphical console), these slowdowns are even so high that they can cause some timeouts in systemd of the guest, so that the boot process of the guest fails.

To still be able to run the block_check_memory_leak on s390x, too, let's disable the virtio-gpu device here to avoid the systemd timeouts. The test is about checking for memory leaks in the block layer, so disabling the graphical console should not change the target area of this test.

Buglink: https://issues.redhat.com/browse/RHEL-102982

ID: 5049

Summary by CodeRabbit

• Chores
  • Added configuration support for an additional system architecture with platform-specific display settings.

[coderabbitai]

Walkthrough

A new s390x-specific architecture configuration was added to the block_check_memory_leak.cfg file, setting vga = none for this architecture alongside existing arm64-pci and arm64-mmio leakage threshold configurations. The change consists of two additional lines with no modifications to logic, error handling, or existing configurations.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding s390x-specific VGA configuration to fix a timeout problem in block_check_memory_leak test.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[huth]

This is not working reliably, I need to reconsider, so I'm closing this PR again