Re: [Qemu-devel] [v3][PATCH 3/4] xen:hw:pci-host:piix: create host bridge to passthrough

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

On Thu, Jul 31, 2014 at 08:09:33PM +0800, Tiejun Chen wrote:
> Implement a pci host bridge specific to passthrough. Actually
> this just inherits the standard one.
> 
> This is based on http://patchwork.ozlabs.org/patch/363810/.
> 
> Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
> ---
>  hw/pci-host/piix.c   | 41 +++++++++++++++++++++++++++++++++++++++++
>  include/hw/i386/pc.h |  2 ++
>  2 files changed, 43 insertions(+)
> 
> v3:
> 
> * Rebase
> 
> v2:
> 
> * Just add prefix with XEN_IGD_PASSTHROUGH/xen_igd_passthrough
> 
> diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
> index 0cd82b8..26ba1e5 100644
> --- a/hw/pci-host/piix.c
> +++ b/hw/pci-host/piix.c
> @@ -93,6 +93,9 @@ typedef struct PIIX3State {
>  #define I440FX_PCI_DEVICE(obj) \
>      OBJECT_CHECK(PCII440FXState, (obj), TYPE_I440FX_PCI_DEVICE)
>  
> +#define XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE(obj) \
> +    OBJECT_CHECK(PCII440FXState, (obj), TYPE_XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE)
> +
>  struct PCII440FXState {
>      /*< private >*/
>      PCIDevice parent_obj;
> @@ -303,6 +306,16 @@ static int i440fx_initfn(PCIDevice *dev)
>      return 0;
>  }
>  
> +static int xen_igd_passthrough_i440fx_initfn(PCIDevice *dev)
> +{
> +    PCII440FXState *d = XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE(dev);
> +
> +    dev->config[I440FX_SMRAM] = 0x02;
> +
> +    cpu_smm_register(&i440fx_set_smm, d);
> +    return 0;
> +}
> +

This is exactly i440fx_initfn.
Don't copy and paste code like this, reuse existing functions.


>  PCIBus *i440fx_init(const char *host_type, const char *pci_type,
>                      PCII440FXState **pi440fx_state,
>                      int *piix3_devfn,
> @@ -703,6 +716,33 @@ static const TypeInfo i440fx_info = {
>      .class_init    = i440fx_class_init,
>  };
>  
> +static void xen_igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
> +
> +    k->init = xen_igd_passthrough_i440fx_initfn;
> +    k->vendor_id = PCI_VENDOR_ID_INTEL;
> +    k->device_id = PCI_DEVICE_ID_INTEL_82441;
> +    k->revision = 0x02;
> +    k->class_id = PCI_CLASS_BRIDGE_HOST;
> +    dc->desc = "IGD PT XEN Host bridge";
> +    dc->vmsd = &vmstate_i440fx;
> +    /*
> +     * PCI-facing part of the host bridge, not usable without the
> +     * host-facing part, which can't be device_add'ed, yet.
> +     */
> +    dc->cannot_instantiate_with_device_add_yet = true;
> +    dc->hotpluggable   = false;
> +}
> +
> +static const TypeInfo xen_igd_passthrough_i440fx_info = {
> +    .name          = TYPE_XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE,
> +    .parent        = TYPE_PCI_DEVICE,
> +    .instance_size = sizeof(PCII440FXState),
> +    .class_init    = xen_igd_passthrough_i440fx_class_init,
> +};
> +
>  static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
>                                                  PCIBus *rootbus)
>  {
> @@ -744,6 +784,7 @@ static const TypeInfo i440fx_pcihost_info = {
>  static void i440fx_register_types(void)
>  {
>      type_register_static(&i440fx_info);
> +    type_register_static(&xen_igd_passthrough_i440fx_info);
>      type_register_static(&piix3_info);
>      type_register_static(&piix3_xen_info);
>      type_register_static(&i440fx_pcihost_info);
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index 9778a71..98ae1a3 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -233,6 +233,8 @@ typedef struct PCII440FXState PCII440FXState;
>  #define TYPE_I440FX_PCI_HOST_BRIDGE "i440FX-pcihost"
>  #define TYPE_I440FX_PCI_DEVICE "i440FX"
>  
> +#define TYPE_XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE "xen-igd-passthrough-i440FX"
> +
>  PCIBus *i440fx_init(const char *host_type, const char *pci_type,
>                      PCII440FXState **pi440fx_state, int *piix_devfn,
>                      ISABus **isa_bus, qemu_irq *pic,
> -- 
> 1.9.1