From: Tomita Moeko <tomitamo...@gmail.com>
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 <tomitamo...@gmail.com>
Reviewed-by: Corvin Köhne <c.koe...@beckhoff.com>
Reviewed-by: Alex Williamson <alex.william...@redhat.com>
Tested-by: Alex Williamson <alex.william...@redhat.com>
Link:
https://lore.kernel.org/qemu-devel/20250505170305.23622-7-tomitamo...@gmail.com
Signed-off-by: Cédric Le Goater <c...@redhat.com>
---
docs/igd-assign.txt | 4 ++--
hw/vfio/pci.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/docs/igd-assign.txt b/docs/igd-assign.txt
index
95beb7681279ca97fc2b4b390045847dcd59eabd..fc444503ff310a317d5d6724b4656c29c4a7dc87
100644
--- a/docs/igd-assign.txt
+++ b/docs/igd-assign.txt
@@ -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
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index
6908bcc0d3145c98d2999841d00451bdc51b6a3e..e1fab21b47adb4df9b011b3efb6d7c15c84bc8c2
100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -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,
--
2.49.0
