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vfio/igd: Detect IGD device by OpRegion

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There is currently no straightforward way to distinguish if a Intel
graphics device is IGD or discrete GPU. However, only IGD devices have
OpRegion. Use the presence of VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION
to identify IGD devices. Still, OpRegion on hotplugged IGD device is
not supported.

Signed-off-by: Tomita Moeko <tomitamoeko@gmail.com>
Reviewed-by: Corvin Köhne <c.koehne@beckhoff.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Tested-by: Alex Williamson <alex.williamson@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250505170305.23622-4-tomitamoeko@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Tomita Moeko 2025-05-06 01:02:59 +08:00 • committed by Cédric Le Goater
parent 1d5f84f349
commit c0273e77f2
1 changed files with 16 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

30
hw/vfio/igd.c
View file

@ -185,9 +185,10 @@ static bool vfio_pci_igd_opregion_init(VFIOPCIDevice *vdev,
return true;
}
static bool vfio_pci_igd_setup_opregion(VFIOPCIDevice *vdev, Error **errp)
static bool vfio_pci_igd_opregion_detect(VFIOPCIDevice *vdev,
struct vfio_region_info **opregion,
Error **errp)
{
g_autofree struct vfio_region_info *opregion = NULL;
int ret;
/* Hotplugging is not supported for opregion access */
@ -198,17 +199,13 @@ static bool vfio_pci_igd_setup_opregion(VFIOPCIDevice *vdev, Error **errp)
ret = vfio_device_get_region_info_type(&vdev->vbasedev,
VFIO_REGION_TYPE_PCI_VENDOR_TYPE | PCI_VENDOR_ID_INTEL,
VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION, &opregion);
VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION, opregion);
if (ret) {
error_setg_errno(errp, -ret,
"Device does not supports IGD OpRegion feature");
return false;
}
if (!vfio_pci_igd_opregion_init(vdev, opregion, errp)) {
return false;
}
return true;
}
@ -480,6 +477,7 @@ void vfio_probe_igd_bar0_quirk(VFIOPCIDevice *vdev, int nr)
static bool vfio_pci_igd_config_quirk(VFIOPCIDevice *vdev, Error **errp)
{
g_autofree struct vfio_region_info *opregion = NULL;
int ret, gen;
uint64_t gms_size;
uint64_t *bdsm_size;
@ -487,16 +485,17 @@ static bool vfio_pci_igd_config_quirk(VFIOPCIDevice *vdev, Error **errp)
bool legacy_mode_enabled = false;
Error *err = NULL;
/*
* This must be an Intel VGA device at address 00:02.0 for us to even
* consider enabling legacy mode. The vBIOS has dependencies on the
* PCI bus address.
*/
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_INTEL, PCI_ANY_ID) ||
!vfio_is_vga(vdev)) {
return true;
}
/* IGD device always comes with OpRegion */
if (!vfio_pci_igd_opregion_detect(vdev, &opregion, errp)) {
return true;
}
info_report("OpRegion detected on Intel display %x.", vdev->device_id);
/*
* IGD is not a standard, they like to change their specs often. We
* only attempt to support back to SandBridge and we hope that newer
@ -572,7 +571,7 @@ static bool vfio_pci_igd_config_quirk(VFIOPCIDevice *vdev, Error **errp)
/* Setup OpRegion access */
if ((vdev->features & VFIO_FEATURE_ENABLE_IGD_OPREGION) &&
!vfio_pci_igd_setup_opregion(vdev, errp)) {
!vfio_pci_igd_opregion_init(vdev, opregion, errp)) {
goto error;
}
@ -672,8 +671,11 @@ error:
*/
static bool vfio_pci_kvmgt_config_quirk(VFIOPCIDevice *vdev, Error **errp)
{
g_autofree struct vfio_region_info *opregion = NULL;
if ((vdev->features & VFIO_FEATURE_ENABLE_IGD_OPREGION) &&
!vfio_pci_igd_setup_opregion(vdev, errp)) {
(!vfio_pci_igd_opregion_detect(vdev, &opregion, errp) ||
!vfio_pci_igd_opregion_init(vdev, opregion, errp))) {
return false;
}