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

[Yuan Wang <yuan1.wang@intel.com>]

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;
     }
 
-- 
2.34.1