Re: [Qemu-devel] [PATCH qom-next for-next v2 2/6] pci: Simplify VMSTATE_PCIE_DEVICE() macro

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Jul 29, 2013 at 02:26:57AM +0200, Andreas Färber wrote:
> Drop the arguments to avoid QOM refactorings causing more churn.
> 
> Signed-off-by: Andreas Färber <afaerber@suse.de>

We discussed and discarded something very similar.

This only works correctly if you put it in a struct which has the pci
device at offset 0, and there's no either runtime or compile-time check
to verify it's the correct type.

So please find some other way to do this.
Or go back to give fields sane names instead
of "parent_obj".


> ---
>  hw/pci-bridge/ioh3420.c            | 2 +-
>  hw/pci-bridge/xio3130_downstream.c | 2 +-
>  hw/pci-bridge/xio3130_upstream.c   | 2 +-
>  hw/usb/hcd-xhci.c                  | 2 +-
>  include/hw/pci/pcie.h              | 6 +++---
>  5 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/pci-bridge/ioh3420.c b/hw/pci-bridge/ioh3420.c
> index e07c7e8..0657354 100644
> --- a/hw/pci-bridge/ioh3420.c
> +++ b/hw/pci-bridge/ioh3420.c
> @@ -187,7 +187,7 @@ static const VMStateDescription vmstate_ioh3420 = {
>      .minimum_version_id_old = 1,
>      .post_load = pcie_cap_slot_post_load,
>      .fields = (VMStateField[]) {
> -        VMSTATE_PCIE_DEVICE(parent_obj.parent_obj.parent_obj, PCIESlot),
> +        VMSTATE_PCIE_DEVICE(),
>          VMSTATE_STRUCT(parent_obj.parent_obj.parent_obj.exp.aer_log,
>                         PCIESlot, 0, vmstate_pcie_aer_log, PCIEAERLog),
>          VMSTATE_END_OF_LIST()
> diff --git a/hw/pci-bridge/xio3130_downstream.c b/hw/pci-bridge/xio3130_downstream.c
> index 2c84b1a..9022949 100644
> --- a/hw/pci-bridge/xio3130_downstream.c
> +++ b/hw/pci-bridge/xio3130_downstream.c
> @@ -154,7 +154,7 @@ static const VMStateDescription vmstate_xio3130_downstream = {
>      .minimum_version_id_old = 1,
>      .post_load = pcie_cap_slot_post_load,
>      .fields = (VMStateField[]) {
> -        VMSTATE_PCIE_DEVICE(parent_obj.parent_obj.parent_obj, PCIESlot),
> +        VMSTATE_PCIE_DEVICE(),
>          VMSTATE_STRUCT(parent_obj.parent_obj.parent_obj.exp.aer_log,
>                         PCIESlot, 0, vmstate_pcie_aer_log, PCIEAERLog),
>          VMSTATE_END_OF_LIST()
> diff --git a/hw/pci-bridge/xio3130_upstream.c b/hw/pci-bridge/xio3130_upstream.c
> index 82add15..046b790 100644
> --- a/hw/pci-bridge/xio3130_upstream.c
> +++ b/hw/pci-bridge/xio3130_upstream.c
> @@ -133,7 +133,7 @@ static const VMStateDescription vmstate_xio3130_upstream = {
>      .minimum_version_id = 1,
>      .minimum_version_id_old = 1,
>      .fields = (VMStateField[]) {
> -        VMSTATE_PCIE_DEVICE(parent_obj.parent_obj, PCIEPort),
> +        VMSTATE_PCIE_DEVICE(),
>          VMSTATE_STRUCT(parent_obj.parent_obj.exp.aer_log, PCIEPort, 0,
>                         vmstate_pcie_aer_log, PCIEAERLog),
>          VMSTATE_END_OF_LIST()
> diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
> index 9ba3e3e..a22861f 100644
> --- a/hw/usb/hcd-xhci.c
> +++ b/hw/usb/hcd-xhci.c
> @@ -3544,7 +3544,7 @@ static const VMStateDescription vmstate_xhci = {
>      .version_id = 1,
>      .post_load = usb_xhci_post_load,
>      .fields = (VMStateField[]) {
> -        VMSTATE_PCIE_DEVICE(parent_obj, XHCIState),
> +        VMSTATE_PCIE_DEVICE(),
>          VMSTATE_MSIX(parent_obj, XHCIState),
>  
>          VMSTATE_STRUCT_VARRAY_UINT32(ports, XHCIState, numports, 1,
> diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
> index c010007..fc4ebd3 100644
> --- a/include/hw/pci/pcie.h
> +++ b/include/hw/pci/pcie.h
> @@ -132,12 +132,12 @@ void pcie_ari_init(PCIDevice *dev, uint16_t offset, uint16_t nextfn);
>  
>  extern const VMStateDescription vmstate_pcie_device;
>  
> -#define VMSTATE_PCIE_DEVICE(_field, _state) {                        \
> -    .name       = (stringify(_field)),                               \
> +#define VMSTATE_PCIE_DEVICE() {                                      \
> +    .name       = "parent_obj",                                      \
>      .size       = sizeof(PCIDevice),                                 \
>      .vmsd       = &vmstate_pcie_device,                              \
>      .flags      = VMS_STRUCT,                                        \
> -    .offset     = vmstate_offset_value(_state, _field, PCIDevice),   \
> +    .offset     = 0,                                                 \
>  }
>  
>  #endif /* QEMU_PCIE_H */
> -- 
> 1.8.1.4