This patch makes pci devices plugging more robust, by not confusing
guest with modern interface when the backend doesn't support
VIRTIO_F_VERSION_1.
Cc: Cornelia Huck <cornelia.h...@de.ibm.com>
Cc: Marcel Apfelbaum <mar...@redhat.com>
Cc: Michael S. Tsirkin <m...@redhat.com>
Cc: qemu-sta...@nongnu.org
Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
---
hw/virtio/virtio-pci.c | 15 +++++++++++++++
hw/virtio/virtio-pci.h | 5 +++++
2 files changed, 20 insertions(+)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 755f921..9e88d7b 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1581,6 +1581,21 @@ static void virtio_pci_device_plugged(DeviceState *d,
Error **errp)
uint32_t size;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+ /*
+ * Virtio capabilities present without
+ * VIRTIO_F_VERSION_1 confuses guests
+ */
+ if (!virtio_test_backend_virtio_1(vdev, errp)) {
+ virtio_pci_disable_modern(proxy);
+ }
+
+ legacy = virtio_pci_legacy(proxy);
+ modern = virtio_pci_modern(proxy);
+ if (!legacy && !modern) {
+ error_setg(errp, "PCI device is neither legacy nor modern.");
+ return;
+ }
+
config = proxy->pci_dev.config;
if (proxy->class_code) {
pci_config_set_class(config, proxy->class_code);
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index 25fbf8a..4e976b3 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -172,6 +172,11 @@ static inline void
virtio_pci_force_virtio_1(VirtIOPCIProxy *proxy)
proxy->disable_legacy = ON_OFF_AUTO_ON;
}
+static inline void virtio_pci_disable_modern(VirtIOPCIProxy *proxy)
+{
+ proxy->disable_modern = true;
+}
+
/*
* virtio-scsi-pci: This extends VirtioPCIProxy.
*/
--
2.7.4
