[Qemu-devel] [PATCH v2] [Bug 1187529] Update bridge mappings for migration/restore

[dkoch@verizon.com]

From: Don Koch <dkoch@verizon.com>

Fix for LP#1187529: Devices on PCI bridge stop working when
live-migrated. Update bridge mappings for all PCI bridge
devices in get_pci_config_device().

Signed-off-by: Don Koch <dkoch@verizon.com>
---
Still using old cast method for PCIBridge since there currently is
no macro for it; this way it will be easier to find and change when
the macro is implemented.

 hw/pci/pci.c                | 5 +++++
 hw/pci/pci_bridge.c         | 2 +-
 include/hw/pci/pci_bridge.h | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index dcc85ef..68aebf9 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -378,6 +378,8 @@ int pci_bus_num(PCIBus *s)
 static int get_pci_config_device(QEMUFile *f, void *pv, size_t size)
 {
     PCIDevice *s = container_of(pv, PCIDevice, config);
+    PCIBridge *b = container_of(s, PCIBridge, dev);
+    PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(s);
     uint8_t *config;
     int i;
 
@@ -395,6 +397,9 @@ static int get_pci_config_device(QEMUFile *f, void *pv, size_t size)
     memcpy(s->config, config, size);
 
     pci_update_mappings(s);
+    if (pc->is_bridge) {
+        pci_bridge_update_mappings(b);
+    }
 
     memory_region_set_enabled(&s->bus_master_enable_region,
                               pci_get_word(s->config + PCI_COMMAND)
diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c
index ecdeab0..02a396b 100644
--- a/hw/pci/pci_bridge.c
+++ b/hw/pci/pci_bridge.c
@@ -224,7 +224,7 @@ static void pci_bridge_region_cleanup(PCIBridge *br, PCIBridgeWindows *w)
     g_free(w);
 }
 
-static void pci_bridge_update_mappings(PCIBridge *br)
+void pci_bridge_update_mappings(PCIBridge *br)
 {
     PCIBridgeWindows *w = br->windows;
 
diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h
index 1868f7a..1d8f997 100644
--- a/include/hw/pci/pci_bridge.h
+++ b/include/hw/pci/pci_bridge.h
@@ -37,6 +37,7 @@ PCIBus *pci_bridge_get_sec_bus(PCIBridge *br);
 pcibus_t pci_bridge_get_base(const PCIDevice *bridge, uint8_t type);
 pcibus_t pci_bridge_get_limit(const PCIDevice *bridge, uint8_t type);
 
+void pci_bridge_update_mappings(PCIBridge *br);
 void pci_bridge_write_config(PCIDevice *d,
                              uint32_t address, uint32_t val, int len);
 void pci_bridge_disable_base_limit(PCIDevice *dev);
-- 
1.7.11.7