feat(itf): add dual-QEMU ivshmem integration-test environment#617
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Add a `dual_qemu` ITF/pytest plugin that boots two QNX VMs sharing one QEMU ivshmem-plain region, extending the upstream single-VM `qemu` plugin. - plugin: config.py, ivshmem_qemu.py, dual_qemu_process.py, __init__.py (target_a/target_b fixtures; sequential boot to avoid KVM race), BUILD, example config, README, example/run_example_manually.sh. - integration_testing.bzl: dual_qemu_integration_test macro (QNX-only, flaky). - example: offset_list.h + simple_ivshmem.cpp map the ivshmem BAR via pci-server and exchange a self-relative offset-pointer list, proving cross-VM pointer resolution; simple_ivshmem_test.py verifies both VMs.
note: Cross-VM shared memory forces the region onto the ivshmem PCI BAR (device/SHMCTL_PHYS memory), but the production lib-memory ControlBlock puts a process-shared pthread_mutex there and locks it during init. QNX refuses to operate a process-shared mutex on device-mapped BAR memory (returns EINVAL even with write-back caching), so the producer aborts — making the umbrella score::memory::shared unusable over ivshmem, unlike the mutex-free demo.
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Add a
dual_qemuITF/pytest plugin that boots two QNX VMs sharing one QEMU ivshmem-plain region, extending the upstream single-VMqemuplugin.