via-ide: ensure that PCI_INTERRUPT_LINE is hard-wired to its default value

Some firmwares accidentally write to PCI_INTERRUPT_LINE on startup which has
no effect on real hardware since it is hard-wired to its default value, but
causes the guest OS to become confused trying to initialise IDE devices
when running under QEMU.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: 20200313082444.2439-5-mark.cave-ayland@ilande.co.uk
Signed-off-by: John Snow <jsnow@redhat.com>

diff --git a/hw/ide/via.c b/hw/ide/via.c
index 3153be8..8363bd4 100644 (file)
--- a/hw/ide/via.c
+++ b/hw/ide/via.c
@@ -169,7 +169,7 @@ static void via_ide_realize(PCIDevice *dev, Error **errp)
 
     pci_config_set_prog_interface(pci_conf, 0x8f); /* native PCI ATA mode */
     pci_set_long(pci_conf + PCI_CAPABILITY_LIST, 0x000000c0);
-    dev->wmask[PCI_INTERRUPT_LINE] = 0xf;
+    dev->wmask[PCI_INTERRUPT_LINE] = 0;
 
     memory_region_init_io(&d->data_bar[0], OBJECT(d), &pci_ide_data_le_ops,
                           &d->bus[0], "via-ide0-data", 8);