static void vfio_vga_probe_ati_3c3_quirk(VFIOPCIDevice *vdev) { VFIOQuirk *quirk; /* * As long as the BAR is >= 256 bytes it will be aligned such that the * lower byte is always zero. Filter out anything else, if it exists. */ if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) || !vdev->bars[4].ioport || vdev->bars[4].region.size < 256) { return; } quirk = g_malloc0(sizeof(*quirk)); quirk->mem = g_malloc0(sizeof(MemoryRegion)); quirk->nr_mem = 1; memory_region_init_io(quirk->mem, OBJECT(vdev), &vfio_ati_3c3_quirk, vdev, "vfio-ati-3c3-quirk", 1); memory_region_add_subregion(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem, 3 /* offset 3 bytes from 0x3c0 */, quirk->mem); QLIST_INSERT_HEAD(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].quirks, quirk, next); trace_vfio_quirk_ati_3c3_probe(vdev->vbasedev.name); }