vfio/pci-quirks: Exclude non-ioport BAR from ATI quirk

The ATI BAR4 quirk is targeting an ioport BAR. Older devices may
have a BAR4 which is not an ioport, causing a segfault here. Test
the BAR type to skip these devices.

Similar to
"8f419c5b: vfio/pci-quirks: Exclude non-ioport BAR from NVIDIA quirk"

Untested, as I don't have the card to test.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2856
Signed-off-by: Vasilis Liaskovitis <[email protected]>
Reviewed-by: Alex Williamson <[email protected]>
Link: https://lore.kernel.org/qemu-devel/[email protected]
Signed-off-by: Cédric Le Goater <[email protected]>

Author: vliaskov

hw/vfio/pci-quirks.c

@@ -403,7 +403,7 @@ static void vfio_probe_ati_bar4_quirk(VFIOPCIDevice *vdev, int nr)
 
     /* This windows doesn't seem to be used except by legacy VGA code */
     if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) ||
-        !vdev->vga || nr != 4) {
+        !vdev->vga || nr != 4 || !vdev->bars[4].ioport) {
         return;
     }