GPIO proxy drivers ready for passthrough testing in VM using systemd #552
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… pin test in gpio-vm
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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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The guest's device tree is not set. That's why the guest kernel fails at startup of microvm@gpio-vm |
The vda device is removed from the gpio-vm because it will not work while we do not have the proper Device Tree in the VM.
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startup of VM fails because the DT does not provide the vda device
gpio-vm's device tree tegra234-p3701-0000-gpio-passthrough.dtb declares the vda device needed for passthrough. gpio-vm goes into emergency mode because it cannot open AMA0 as a console. Uarta passthrough is disabled because of conflicts with GPIO passthrough. We need to disable the QEMU console. Somewhere in the code console=ttyAMA0 is set for QEMU. It is not obvious where.
At the moment device tree overlays are not working when applied according to template from other VM's. Posible cause is big changes introduced in upstream. Will merge with tiiuae after this commit.
VM kernel params are -amend rootwait console=ttyS3 No qemu.extraArgs are set
Recent merge is partially retrenched. Newer files breaks this GPIO version because the host dtb overlay is broken by netvm-wlan-pci-passthrough. The changes in tiiuae git are realated to pci passthrough, optee kernel, "machine" option for microvm/qemu and a patch provided for netvm-wlan-pci-passthrough
GPIO guest driver in VM throws error at initialisation of shared qemu memory. ioremap fails: mem_iova = ioremap(gpio_vpa, MEM_SIZE);
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Guest proxy driver can passtrough low level readl and writel to host proxy. This might (meaning: still being tested) be necessary to allow guest to set up GPIO pins declared in guest's Device Tree.
…99608/72089e71a1f3d9f2d854711c6e16b703f1a426da
- New baseline for adding more passthrough functions - ./simple-chardev-test.sh works in /dev/gpio-host and /dev/gpio.guest - readl/writel execution blocked in host - Guest kernel is not aware of pins in host (gpioinfo gives false data) - use qemu: 8c5b0acccd3b4f47ba84d23b628ef294533e662a - kernel: e3a4e96cd08ab8d1a31498a10f8f7320ef53bd9d/2d96cc2e8e1c4ee4a3e973023b6c398a98dc0d93 - precompiled as nix generation 233
- return value written to char buffer in write() - return values from host seem reliable - return value is 64 bit written at offset 2 words, 2*8 bytes - full chain to guest does not work (qemu problem?) - platform to fix qemu problem - Guest kernel is not aware of pins in host (gpioinfo gives false data) - kernel: 5b7326f7ce046a8ae6c943e238a645356f237f7b/e625198f19ab6874ea89e0a7b1c5c4dfacb38710 - precompiled as nix generation 274
- gpio-virt commit 71192f60bd8b8f6be4d529c49b7c33529e21a1e2
- kernel 5.10 commit fb9220ac23c9892ec6433f0e839b8f919511a927
- qemu in ghaf is not yet updated
- use qemu 8.1.2 patch
in commit 95d5cdb19713369a9dceab53659628292d9ff884
- precompiled into generation 299 (on dev system)
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- added source patches:
- kernel adfe63ef006a696e7384b9cee340f05bf7f4f1b3
from git@github.com:KimGSandstrom/tegra_kernel-5.10.git
- gpio-virt patch d90bd5625957fd164e4eb50803bd724fda89ba68
from git@github.com:KimGSandstrom/gpio-virt.git
- qemu 9.0.2 GPIO passthrough patch b077b3cb519958d091cd753f7015ffafd3bfcaee
from git@github.com:KimGSandstrom/qemu-passthrough
- GPIO passthrough works with provided qemu
- microvm@gpio-vm.service does not start up correctly
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Kernel update for GPIO passthrough.
Starts gpio-vm VM for testing