On Mon, Dec 08, 2014 at 10:38:09AM +0000, David Vrabel wrote: > On 05/12/14 17:22, Konrad Rzeszutek Wilk wrote: > > On Fri, Dec 05, 2014 at 10:30:01AM +0000, David Vrabel wrote: > >> 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. > > > > Could you enumerate the 'simple solution' then please? I am having > > a frustrating time figuring out what it is that you are proposing. > > I've posted it repeatedly. Are you referring to http://lists.xenproject.org/archives/html/xen-devel/2014-07/msg01270.html which is still waiting for your feedback? -- 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
