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vfio/igd: Enable OpRegion by default

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As the presence of OpRegion is used to detect IGD device now, and
guest driver usually depends on OpRegion to work. Enable OpRegion
on IGD devices by default for out-of-the-box passthrough experience
(except pre-boot display output), especially for libvirt users.

Example of IGD passthrough with libvirt:
<hostdev mode="subsystem" type="pci" managed="yes">
  <source>
    <address domain="0x0000" bus="0x00" slot="0x02" function="0x0"/>
  </source>
  <rom file="/path/to/igd/rom"/>
  <address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0"/>
 </hostdev>

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/20250505170305.23622-7-tomitamoeko@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Tomita Moeko 2025-05-06 01:03:02 +08:00 • committed by Cédric Le Goater
parent 106cdbcef4
commit 16cbb43302
2 changed files with 3 additions and 3 deletions
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4
docs/igd-assign.txt
View file

@ -102,7 +102,7 @@ digital formats work well.
Options
=======
* x-igd-opregion=[on|*off*]
* x-igd-opregion=[*on*|off]
Copy host IGD OpRegion and expose it to guest with fw_cfg
* x-igd-lpc=[on|*off*]
@ -124,7 +124,7 @@ Examples
* Adding IGD with OpRegion and LPC ID hack, but without VGA ranges
(For UEFI guests)
-device vfio-pci,host=00:02.0,id=hostdev0,addr=2.0,x-igd-legacy-mode=off,x-igd-opregion=on,x-igd-lpc=on,romfile=efi_oprom.rom
-device vfio-pci,host=00:02.0,id=hostdev0,addr=2.0,x-igd-legacy-mode=off,x-igd-lpc=on,romfile=efi_oprom.rom
Guest firmware

2
hw/vfio/pci.c
View file

@ -3385,7 +3385,7 @@ static const Property vfio_pci_dev_properties[] = {
DEFINE_PROP_BIT("x-req", VFIOPCIDevice, features,
VFIO_FEATURE_ENABLE_REQ_BIT, true),
DEFINE_PROP_BIT("x-igd-opregion", VFIOPCIDevice, features,
VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, false),
VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, true),
DEFINE_PROP_BIT("x-igd-lpc", VFIOPCIDevice, features,
VFIO_FEATURE_ENABLE_IGD_LPC_BIT, false),
DEFINE_PROP_ON_OFF_AUTO("x-igd-legacy-mode", VFIOPCIDevice,