On Tue, 2025-04-29 at 00:10 +0800, Tomita Moeko wrote:
> CAUTION: External Email!!
> The Intel GVT-g backend `kvmgt` always emulates OpRegion for vGPU,
> make sure the OpRegion is present for enabling access to it
> automatically later.
>
> Also, hotplugging GVT-g vGPU is now always disallowed regardless of
> OpRegion to prevent potential issues. Intel has never claimed support
> for GVT-g hotplugging.
>
> Signed-off-by: Tomita Moeko <tomitamo...@gmail.com>
> ---
> hw/vfio/igd.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/hw/vfio/igd.c b/hw/vfio/igd.c
> index c6ecbefb35..496d3df598 100644
> --- a/hw/vfio/igd.c
> +++ b/hw/vfio/igd.c
> @@ -684,9 +684,13 @@ static bool vfio_pci_kvmgt_config_quirk(VFIOPCIDevice
> *vdev, Error **errp)
> return true;
> }
>
> + if (!vfio_pci_igd_opregion_detect(vdev, &opregion, errp)) {
> + /* Should never reach here, KVMGT always emulates OpRegion */
> + return false;
> + }
> +
> if ((vdev->features & VFIO_FEATURE_ENABLE_IGD_OPREGION) &&
> - (!vfio_pci_igd_opregion_detect(vdev, &opregion, errp) ||
> - !vfio_pci_igd_opregion_init(vdev, opregion, errp))) {
> + !vfio_pci_igd_opregion_init(vdev, opregion, errp)) {
> return false;
> }
> Reviewed-by: Corvin Köhne <c.koe...@beckhoff.com> -- Kind regards, Corvin
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