On Tue, Aug 28, 2018 at 5:57 PM, Peter Wu <peter@xxxxxxxxxxxxx> wrote: > Only non-bridge devices can be passed to a guest, but perhaps logging > access to the emulated bridge is already sufficient. The Prefetchable > Base Upper 32 Bits register is at offset 0x28. > > In a trace where the Nvidia device is disabled/enabled via Device > Manager, I see writes on the enable path: > > 2571@1535108904.593107:rp_write_config (ioh3420, @0x28, 0x0, len=0x4) Did you do anything special to get an emulated bridge included in this setup? Folllowing the instructions at https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF I can successfully pass through devices to windows running under virt-manager. In the nvidia GPU case I haven't got passed the driver installation failure, but I can pass through other devices OK and install their drivers. However I do not end up with any PCI-to-PCI bridges in this setup. The passed through device sits at address 00:08.0, parent is the PCI host bridge 00:00.0. (I'm trying to spy if Windows appears to restore or reset the PCI bridge prefetch registers upon resume) Thanks Daniel
