Re: [Qemu-devel] [Bug 1187529] [PATCH] Update mappings after PCI bridge live migration or save-restore.

[Don Koch <dkoch@cloudswitch.com>]

On 07/03/2013 12:15 PM, Andreas Färber wrote:
> Am 03.07.2013 17:04, schrieb Don Koch:
>> From: Don Koch <dkoch@verizon.com>
>>
>> Update mappings for PCI bridge after live migration.
>>
>> Signed-off-by: Don Koch <dkoch@verizon.com>
>> ---
>> This fixes bug 1187529: devices on a PCI bridge stop working after migration.
> 
> Feel free to reference this as LP#1187529 in the commit message if this
> is from QEMU's Launchpad bug tracker.

OK, will do. (Wasn't aware of this convention.)

>>
>>  hw/pci-bridge/pci_bridge_dev.c | 9 +++++++++
>>  hw/pci/pci_bridge.c            | 2 +-
>>  include/hw/pci/pci_bridge.h    | 1 +
>>  3 files changed, 11 insertions(+), 1 deletion(-)
>>
>> diff --git a/hw/pci-bridge/pci_bridge_dev.c b/hw/pci-bridge/pci_bridge_dev.c
>> index 971b432..9e5062e 100644
>> --- a/hw/pci-bridge/pci_bridge_dev.c
>> +++ b/hw/pci-bridge/pci_bridge_dev.c
>> @@ -110,6 +110,14 @@ static void qdev_pci_bridge_dev_reset(DeviceState *qdev)
>>      shpc_reset(dev);
>>  }
>>  
>> +static int pci_bridge_dev_post_load(void *opaque, int ver) {
>> +    PCIDevice *d = opaque;
>> +    PCIBridge *s = container_of(d, PCIBridge, dev);
> 
> Casting should no longer be done that way. It seems there is no
> PCI_BRIDGE() cast macro in upstream yet, but it doesn't seem necessary
> either. You can just use:
> 
> PCIBridge *s = opaque;
> 
> for simplicity.

Might I suggest submitting the patch as is (possibly modulo Michael
Tsirkin's suggestions) and later submitting a PCI_BRIDGE macro patch to
"standardize" the casting?

> 
> Functional change looks sensible to me.
> 
> Regards,
> Andreas
> 
>> +
>> +    pci_bridge_update_mappings(s);
>> +    return 0;
>> +}
>> +
>>  static Property pci_bridge_dev_properties[] = {
>>                      /* Note: 0 is not a legal chassis number. */
>>      DEFINE_PROP_UINT8("chassis_nr", PCIBridgeDev, chassis_nr, 0),
>> @@ -119,6 +127,7 @@ static Property pci_bridge_dev_properties[] = {
>>  
>>  static const VMStateDescription pci_bridge_dev_vmstate = {
>>      .name = "pci_bridge",
>> +    .post_load = pci_bridge_dev_post_load,
>>      .fields = (VMStateField[]) {
>>          VMSTATE_PCI_DEVICE(bridge.dev, PCIBridgeDev),
>>          SHPC_VMSTATE(bridge.dev.shpc, PCIBridgeDev),
>> diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c
>> index 24be6c5..3897bd8 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);
>>
> 
>