Re: [PATCH v2] vfio/igd: Add device ID support for Meteor Lake and Arrow Lake

["Cédric Le Goater" <clg@redhat.com>]

On 8/25/26 11:04, Yuan Wang wrote:
> Currently, igd_gen() does not include the PCI device IDs for Meteor
> Lake and Arrow Lake platforms, causing it to return -1 for these GPUs.
> 
> As a result, QEMU calculates the stolen memory size as 0 and exposes a
> zero-sized 'etc/igd-bdsm-size' entry via fw_cfg. When OVMF boots,
> IgdAssignmentDxe fails validation on the zero BDSM size and aborts
> without programming the ASLS register. Consequently, the guest Intel
> GOP driver fails to locate and read the OpRegion (ASLS remains 0x0).
> 
> Add the device ID prefixes (0x7D00 and 0xB600) to igd_gen() as Gen 12
> so that stolen memory is correctly determined, allowing OVMF to properly
> initialize the OpRegion and BDSM for the Intel GOP driver.
> 
> Signed-off-by: Yuan Wang <yuan1.wang@intel.com>
> ---
> v2:
> - Resending because the v1 patch was sent with an incorrect future
>    system timestamp due to an unsynchronized local clock. No code
>    changes.
> ---
>   hw/vfio/igd.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/hw/vfio/igd.c b/hw/vfio/igd.c
> index 413a49aae9..a0b6b34d81 100644
> --- a/hw/vfio/igd.c
> +++ b/hw/vfio/igd.c
> @@ -96,6 +96,8 @@ static int igd_gen(VFIOPCIDevice *vdev)
>       case 0x4C00:    /* Rocket Lake */
>       case 0x4600:    /* Alder Lake */
>       case 0xA700:    /* Raptor Lake */
> +    case 0x7D00:    /* Meteor Lake / Arrow Lake */
> +    case 0xB600:    /* Arrow Lake */
>           return 12;
>       }
>   

Reviewed-by: Cédric Le Goater <clg@redhat.com>

Thanks,

C.