Commit e4eccb85 authored Nov 03, 2020 by Fred Gao Committed by Alex Williamson Nov 03, 2020

vfio/pci: Bypass IGD init in case of -ENODEV



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@linux.intel.com>
Cc: Xiong Zhang <xiong.y.zhang@intel.com>
Cc: Hang Yuan <hang.yuan@linux.intel.com>
Cc: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Fred Gao <fred.gao@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

parent bb742ad0

drivers/vfio/pci/vfio_pci.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -385,7 +385,7 @@ 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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