Hello,

I need to pass through the PCIe bus to Linux VM via io and uvmm servers.

First, I generated the corresponding dtb file from qemu for virt machine to get the exact pcie device node.

$ qemu-system-aarch64 -nographic -machine virt,virtualization=true,dumpdtb=conf/arm_virt-64-full.dtb
$ dtc -I dtb -O dts conf/arm_virt-64-full.dtb

Secondly, I copied the following nodes to my dts file (pcie@10000000, intc@8000000 and v2m@8020000) exactly as they are in the original dts file.

Finally, I modified the ned scripts as mentioned in the comments of the pcie_ecam.cc file.

The issue is that there is no IO driver for the device v2m@8020000 which is responsible for msi-controller.

This device is needed for the PCIe.

The error logs :

VMM[PCIe ctl]: PCIe host bridge pcie@10000000 refers to invalid MSI controller: MSI parent is not an MSI controller
VMM[HW PCI dev]: No MSI-X controller available for MSI-X device pci_bus[1] (devid=1)
VMM[HW PCI dev]: No MSI-X controller available for MSI-X device pci_bus[2] (devid=2).
VMM[ioproxy]: No corresponding IO resource for 'v2m@8020000'.reg[0] (0x8020000-0x8020fff).
VMM[vm]: Device creation for v2m@8020000 failed. Disabling device.

How can I pass through the PCIe device if there is no IO driver for the needed msi-controller ?

Thanks in advance,

Regards

Mohamed Dawod

Software Engineer, Cairo Egypt