Hi, I have an Intel network card inside a VM using PCI-Passthrough and I would like to write one register (the Physical Hardware Clock) but from inside the host, as writing it from inside the VM is complicated with all the unstable vTSC or other time sensitive tools which don't work best from inside a VM.
I know that I cannot write it from the host's network driver, as the driver will unbind the card when starting the VM, so let's say I write the register from another place (either hacking the network driver or from the VFIO driver). Do you think this would be possible? Also, should I worry about locking the access so that the host and VM don't write to the PCI config space at the same time? I watched Alex's VFIO presentations and I understand that through Memory Mapped IO the VM can directly write the PCI config space, so the host will not be able to intercept and, in my case, to do the locking. And my apologies if these questions were asked before. I did do a quick search but could not find anything relevant. Thank you. Cosmin.
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