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vfio/igd: Check vendor and device ID on GVT-g mdev

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Check the vendor and device ID on GVT-g mdev to ensure it is a supported
device [1]. This extra check is required for automatically enabling
OpRegion access later.

Note that Cherryview and Gemini Lake are marked as supported here since
current code cannot distinguish them with other Gen8 and Gen9 devices.
Since mdev cannot be created on these devices, this has no functional
impact.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/i915/intel_gvt.c?h=v6.14#n52

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/20250505170305.23622-5-tomitamoeko@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Tomita Moeko 2025-05-06 01:03:00 +08:00 • committed by Cédric Le Goater
parent c0273e77f2
commit 2bd33abcf1
1 changed files with 12 additions and 0 deletions
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12
hw/vfio/igd.c
View file

@ -672,6 +672,18 @@ error:
static bool vfio_pci_kvmgt_config_quirk(VFIOPCIDevice *vdev, Error **errp)
{
g_autofree struct vfio_region_info *opregion = NULL;
int gen;
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_INTEL, PCI_ANY_ID) ||
!vfio_is_vga(vdev)) {
return true;
}
/* FIXME: Cherryview is Gen8, but don't support GVT-g */
gen = igd_gen(vdev);
if (gen != 8 && gen != 9) {
return true;
}
if ((vdev->features & VFIO_FEATURE_ENABLE_IGD_OPREGION) &&
(!vfio_pci_igd_opregion_detect(vdev, &opregion, errp) ||