GPIO proxy drivers ready for passthrough testing in VM using systemd #552
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… pin test in gpio-vm
- The kernel contains two additional drivers TEGRA_GPIO_HOST_PROXYTEGRA_GPIO_HOST_PROXY and TEGRA_GPIO_GUEST_PROXY - microvm starts a qemu VM for GPIO passthrouh. - Host and VM -- i.e. Guest -- run the same patched Linux kernel - Guest starts a systemd service called gpiotest which runs a script with a very brief sanity test of GPIO passthrough. - kernel configuration for all virtualisation is set in the same file it is a todo to diversify it. Signed-off-by: Kim Sandström <kim.sandstrom@unikie.com>
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Failure
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After merging with newest tiiuae ghaf the virtual machine and its service (microvm@gpio-vm.service) do not start up anymore. No VM seem to be running. this is missing: |
- changes concern activation and deactivation of virtualised elements in passthough of uarta, bpmp, gpio. - code deactivates uarta and bpmp because bpmp kernel patches conflict with gpio patches. This could be fixed by remaking the bpmp patches.
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Failure
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The guest's device tree is not set. That's why the guest kernel fails at startup of microvm@gpio-vm |
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Failure
GPIO guest driver in VM throws error at initialisation of shared qemu memory. ioremap fails at: mem_iova = ioremap(gpio_vpa, MEM_SIZE);
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Kernel update for GPIO passthrough.
Starts gpio-vm VM for testing