On 04/12/14 15:39, Alex Williamson wrote: > > I don't know what workaround you're talking about. As devices are > released from the user, vfio-pci attempts to reset them. If > pci_reset_function() returns success we mark the device clean, otherwise > it gets marked dirty. Each time a device is released, if there are > dirty devices we test whether we can try a bus/slot reset to clean them. > In the case of assigning a GPU this typically means that the GPU or > audio function come through first, there's no reset mechanism so it gets > marked dirty, the next device comes through and we manage to try a bus > reset. vfio-pci does not have any device specific resets, all > functionality is added to the PCI-core, thank-you-very-much. I even > posted a generic PCI quirk patch recently that marks AMD VGA PM reset as > bad so that pci_reset_function() won't claim that worked. All VGA > access quirks are done in QEMU, the kernel doesn't have any business in > remapping config space over MMIO regions or trapping other config space > backdoors. Thanks for the info Alex, I hadn't got around to actually looking and the vfio-pci code and was just going to what Sander said. We probably do need to have a more in depth look at now PCI devices and handled by both the toolstack and pciback but in the short term I would like a simple solution that does not extend the ABI. David -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
