QEMU PCIe TLP Emulation

Issue

Does QEMU emulate the PCIe Transaction Layer somehow?

When I have a virtual Switch like (https://blogs.oracle.com/linux/post/a-study-of-the-linux-kernel-pci-subsystem-with-qemu) am I able to intercept at least the TLP's going over it? Or is the abstraction so high the the hypervisor does not go down to that layer at all.

Solution

As expected QEMU does not implement the TLP layer at the moment. Instead whenever a memory access happens qemu jumps out of the KVM execution and handles MMIO.

Answered By - Benedict Schlüter