[Qemu-devel] [PATCH V2] hw/pci: disable pci-bridge's shpc by default

[Marcel Apfelbaum <marcel@redhat.com>]

The shpc component is optional while  ACPI hotplug is used
for hot-plugging PCI devices into a PCI-PCI bridge.
Disabling the shpc by default will make slot 0 usable at boot time
and not only for hot-plug, without loosing any functionality.
Older machines will have shpc enabled for compatibility reasons.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---
v1 -> v2:
 - Moved the compat property to HW_COMPAT_2_8

 hw/pci-bridge/pci_bridge_dev.c | 2 +-
 include/hw/compat.h            | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/pci-bridge/pci_bridge_dev.c b/hw/pci-bridge/pci_bridge_dev.c
index 5dbd933..647ad80 100644
--- a/hw/pci-bridge/pci_bridge_dev.c
+++ b/hw/pci-bridge/pci_bridge_dev.c
@@ -163,7 +163,7 @@ static Property pci_bridge_dev_properties[] = {
     DEFINE_PROP_ON_OFF_AUTO(PCI_BRIDGE_DEV_PROP_MSI, PCIBridgeDev, msi,
                             ON_OFF_AUTO_AUTO),
     DEFINE_PROP_BIT(PCI_BRIDGE_DEV_PROP_SHPC, PCIBridgeDev, flags,
-                    PCI_BRIDGE_DEV_F_SHPC_REQ, true),
+                    PCI_BRIDGE_DEV_F_SHPC_REQ, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/include/hw/compat.h b/include/hw/compat.h
index 4fe44d1..428c127 100644
--- a/include/hw/compat.h
+++ b/include/hw/compat.h
@@ -2,7 +2,11 @@
 #define HW_COMPAT_H
 
 #define HW_COMPAT_2_8 \
-    /* empty */
+    {\
+        .driver   = "pci-bridge",\
+        .property = "shpc",\
+        .value    = "on",\
+    },
 
 #define HW_COMPAT_2_7 \
     {\
-- 
2.5.5