[PATCH v4 14/16] libqos: make the virtio-pci BAR index configurable

[Stefan Hajnoczi <stefanha@redhat.com>]

The Legacy virtio-pci interface always uses BAR 0.  VIRTIO 1.0 may need
to use a different BAR index, so make it configurable.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
v3:
 * Change uint8_t bar_idx to int [Thomas]
---
 tests/libqos/virtio-pci.h | 2 ++
 tests/libqos/virtio-pci.c | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/tests/libqos/virtio-pci.h b/tests/libqos/virtio-pci.h
index 0e4a8b7b00..78a1c15c2a 100644
--- a/tests/libqos/virtio-pci.h
+++ b/tests/libqos/virtio-pci.h
@@ -25,6 +25,8 @@ typedef struct QVirtioPCIDevice {
     uint16_t config_msix_entry;
     uint64_t config_msix_addr;
     uint32_t config_msix_data;
+
+    int bar_idx;
 } QVirtioPCIDevice;
 
 struct QVirtioPCIMSIXOps {
diff --git a/tests/libqos/virtio-pci.c b/tests/libqos/virtio-pci.c
index c900742f96..e9595603f5 100644
--- a/tests/libqos/virtio-pci.c
+++ b/tests/libqos/virtio-pci.c
@@ -310,7 +310,7 @@ static const QVirtioPCIMSIXOps qvirtio_pci_msix_ops_legacy = {
 void qvirtio_pci_device_enable(QVirtioPCIDevice *d)
 {
     qpci_device_enable(d->pdev);
-    d->bar = qpci_iomap(d->pdev, 0, NULL);
+    d->bar = qpci_iomap(d->pdev, d->bar_idx, NULL);
 }
 
 void qvirtio_pci_device_disable(QVirtioPCIDevice *d)
@@ -400,6 +400,7 @@ static void qvirtio_pci_init_from_pcidev(QVirtioPCIDevice *dev, QPCIDevice *pci_
 {
     dev->pdev = pci_dev;
     dev->vdev.device_type = qpci_config_readw(pci_dev, PCI_SUBSYSTEM_ID);
+    dev->bar_idx = 0;
 
     dev->config_msix_entry = -1;
     dev->msix_ops = &qvirtio_pci_msix_ops_legacy;
-- 
2.21.0