[Qemu-devel] [PATCH] virtio-pci: Add subsystem-vendor-id property

[Ben Warren via Qemu-devel]

From: Ben Warren <b...@skyportsystems.com>

Now that virtio-win guest drivers provided by non-Redhat vendors need to
use a different Subsystem Vendor ID value, a way is needed to set this
parameter on the host.  This works with all of the PCI-based devices,
such as NetKVM, viostor, vioscsi, vioserial and balloon.

Signed-off-by: Ben Warren <b...@skyportsystems.com>
---
 hw/virtio/virtio-pci.c | 5 +++++
 hw/virtio/virtio-pci.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index e92837c..b5c86e3 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1757,6 +1757,9 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error 
**errp)
     if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
         proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
     }
+    /* Set the PCI Subsystem Vendor ID */
+    k->parent_class.subsystem_vendor_id = proxy->subsystem_vendor_id;
+    pci_set_word(pci_dev->config + PCI_SUBSYSTEM_VENDOR_ID, 
proxy->subsystem_vendor_id);
 
     if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) {
         error_setg(errp, "device cannot work as neither modern nor legacy mode"
@@ -1876,6 +1879,8 @@ static Property virtio_pci_properties[] = {
                     VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true),
     DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags,
                     VIRTIO_PCI_FLAG_INIT_PM_BIT, true),
+    DEFINE_PROP_UINT16("subsystem-vendor-id", VirtIOPCIProxy,
+                       subsystem_vendor_id, PCI_VENDOR_ID_REDHAT_QUMRANET),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index 12d3a90..8a897ea 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -186,6 +186,7 @@ struct VirtIOPCIProxy {
     VirtIOIRQFD *vector_irqfd;
     int nvqs_with_notifiers;
     VirtioBusState bus;
+    uint16_t subsystem_vendor_id;
 };
 
 static inline bool virtio_pci_modern(VirtIOPCIProxy *proxy)
-- 
2.7.4