On Tue, 3 Nov 2020 02:01:20 +0800
Fred Gao <fred.gao@xxxxxxxxx> wrote:
> Bypass the IGD initialization when -ENODEV returns,
> that should be the case if opregion is not available for IGD
> or within discrete graphics device's option ROM,
> or host/lpc bridge is not found.
>
> Then use of -ENODEV here means no special device resources found
> which needs special care for VFIO, but we still allow other normal
> device resource access.
>
> Cc: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
> Cc: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
> Cc: Hang Yuan <hang.yuan@xxxxxxxxxxxxxxx>
> Cc: Stuart Summers <stuart.summers@xxxxxxxxx>
> Signed-off-by: Fred Gao <fred.gao@xxxxxxxxx>
> ---
> drivers/vfio/pci/vfio_pci.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Applied to vfio for-linus branch for v5.10. Thanks,
Alex
>
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index f634c81998bb..c88cf9937469 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -341,7 +341,7 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev)
> pdev->vendor == PCI_VENDOR_ID_INTEL &&
> IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
> ret = vfio_pci_igd_init(vdev);
> - if (ret) {
> + if (ret && ret != -ENODEV) {
> pci_warn(pdev, "Failed to setup Intel IGD regions\n");
> goto disable_exit;
> }
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