Both intel documentation [1][2] and i915 driver shows GGMS represents GTT stolen memory size in multiple of 1MB, not 2MB starting from gen 8.
[1] https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/3rd-gen-core-desktop-vol-2-datasheet.pdf [2] https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/4th-gen-core-family-desktop-vol-2-datasheet.pdf Signed-off-by: Tomita Moeko <tomitamo...@gmail.com> --- hw/vfio/igd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/vfio/igd.c b/hw/vfio/igd.c index 4047f4f071..e40e601026 100644 --- a/hw/vfio/igd.c +++ b/hw/vfio/igd.c @@ -268,7 +268,7 @@ static int vfio_igd_gtt_max(VFIOPCIDevice *vdev) gmch = vfio_pci_read_config(&vdev->pdev, IGD_GMCH, sizeof(gmch)); ggms = (gmch >> (gen < 8 ? 8 : 6)) & 0x3; - if (gen > 6) { + if (gen > 7) { ggms = 1 << ggms; } @@ -678,7 +678,7 @@ void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr) /* Determine the size of stolen memory needed for GTT */ ggms_mb = (gmch >> (gen < 8 ? 8 : 6)) & 0x3; - if (gen > 6) { + if (gen > 7) { ggms_mb = 1 << ggms_mb; } -- 2.45.2
