Set blob_alignment to the host page size so the guest kernel can align blob BAR offsets accordingly, avoiding alignment mismatches with the VMM's memory mapping API (e.g., hv_vm_map on macOS).
Guest-side kernel support (drm_mm alignment) is pending upstream Linux merge. Signed-off-by: Lucas Amaral <[email protected]> --- hw/display/virtio-gpu.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c index de7a86a7..44ae5034 100644 --- a/hw/display/virtio-gpu.c +++ b/hw/display/virtio-gpu.c @@ -1532,6 +1532,14 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp) #endif } + /* + * TODO: guest-side F_BLOB_ALIGNMENT support pending upstream Linux merge + * (Sergio Lopez's patches, Nov 2025). Until merged, the guest won't + * negotiate this feature. The host advertises it per OASIS virtio spec. + */ + g->parent_obj.virtio_config.blob_alignment = + cpu_to_le32(qemu_real_host_page_size()); + if (!virtio_gpu_base_device_realize(qdev, virtio_gpu_handle_ctrl_cb, virtio_gpu_handle_cursor_cb, -- 2.52.0
