From: Greg Kurz <gk...@linux.vnet.ibm.com>
Without presuming if we got there because of a user mistake or some
more subtle bug in the tooling, it really does not make sense to
implement a non-functional device.
Signed-off-by: Greg Kurz <gk...@linux.vnet.ibm.com>
Signed-off-by: Greg Kurz <gr...@kaod.org>
---
v2: - error out at realize time as suggested by Connie
- updated title and changelog
---
hw/virtio/virtio-pci.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index f0677b73d860..8d707aac0c21 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1838,6 +1838,12 @@ static void virtio_pci_dc_realize(DeviceState *qdev,
Error **errp)
VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
PCIDevice *pci_dev = &proxy->pci_dev;
+ if (proxy->flags & VIRTIO_PCI_FLAG_DISABLE_LEGACY &&
+ proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN) {
+ error_setg(errp, "device is unserviceable when both legacy and modern
modes are disabled. At least one of the disable-modern or disable-legacy
properties should be set to false.");
+ return;
+ }
+
if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) &&
!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN)) {
pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
