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vfio/pci: Intel IGD host and LCP bridge config space access

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Provide read-only access to PCI config space of the PCI host bridge
and LPC bridge through device specific regions.  This may be used to
configure a VM with matching register contents to satisfy driver
requirements.  Providing this through the vfio file descriptor removes
an additional userspace requirement for access through pci-sysfs and
removes the CAP_SYS_ADMIN requirement that doesn't appear to apply to
the specific devices we're accessing.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson
2016-02-22 16:02:45 -07:00
parent 5846ff54e8
commit f572a960a1
4 changed files with 186 additions and 7 deletions
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15
drivers/vfio/pci/vfio_pci.c
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@@ -111,6 +111,7 @@ static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
}
static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
static void vfio_pci_disable(struct vfio_pci_device *vdev);
static int vfio_pci_enable(struct vfio_pci_device *vdev)
{
@@ -170,10 +171,16 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev)
vdev->has_vga = true;
if (vfio_pci_is_vga(pdev) && pdev->vendor == PCI_VENDOR_ID_INTEL) {
if (vfio_pci_igd_opregion_init(vdev) == 0)
dev_info(&pdev->dev,
"Intel IGD OpRegion support enabled\n");
if (vfio_pci_is_vga(pdev) &&
pdev->vendor == PCI_VENDOR_ID_INTEL &&
IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
ret = vfio_pci_igd_init(vdev);
if (ret) {
dev_warn(&vdev->pdev->dev,
"Failed to setup Intel IGD regions\n");
vfio_pci_disable(vdev);
return ret;
}
}
return 0;