QEMU PCIe TLP Emulation

Question

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.

I already took a look at the QEMU source code and it seems the the answer is no. However, I might have overlooked something. — Benedict Schlüter, Apr 01 '22 at 12:09

score 1 · Accepted Answer · answered Apr 22 '22 at 19:31

1

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 Apr 22 '22 at 19:31

Benedict Schlüter

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QEMU PCIe TLP Emulation

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