Re: [Xen-devel] [PATCH 1/4] hw:i386:pc_piix: split pc_init1()

["Michael S. Tsirkin" <mst@xxxxxxxxxx>]

On Thu, Jul 24, 2014 at 07:30:26PM +0800, Tiejun Chen wrote:
> We'd like to split pc_init1 and then we can share something
> with other stuff.
> 
> Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>

Did you test this patch? It does not look like it can work.

> ---
>  hw/i386/pc_piix.c | 93 
> +++++++++++++++++++++++++++++++++++++++++--------------
>  1 file changed, 70 insertions(+), 23 deletions(-)
> 
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index 7081c08..2391fda 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -70,34 +70,21 @@ static bool smbios_legacy_mode;
>  static bool gigabyte_align = true;
>  static bool has_reserved_memory = true;
>  
> -/* PC hardware initialisation */
> -static void pc_init1(MachineState *machine,
> +static ram_addr_t below_4g_mem_size;
> +static ram_addr_t above_4g_mem_size;
> +static void pc_machine_base_init(MachineState *machine,
>                       int pci_enabled,
> -                     int kvmclock_enabled)
> +                     int kvmclock_enabled,
> +                     DeviceState *icc_bridge,
> +                     MemoryRegion *ram_memory,
> +                     MemoryRegion *pci_memory,
> +                     qemu_irq *gsi,
> +                     GSIState *gsi_state,
> +                     FWCfgState *fw_cfg)
>  {
>      PCMachineState *pc_machine = PC_MACHINE(machine);
>      MemoryRegion *system_memory = get_system_memory();
> -    MemoryRegion *system_io = get_system_io();
> -    int i;
> -    ram_addr_t below_4g_mem_size, above_4g_mem_size;
> -    PCIBus *pci_bus;
> -    ISABus *isa_bus;
> -    PCII440FXState *i440fx_state;
> -    int piix3_devfn = -1;
> -    qemu_irq *cpu_irq;
> -    qemu_irq *gsi;
> -    qemu_irq *i8259;
> -    qemu_irq *smi_irq;
> -    GSIState *gsi_state;
> -    DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
> -    BusState *idebus[MAX_IDE_BUS];
> -    ISADevice *rtc_state;
> -    ISADevice *floppy;
> -    MemoryRegion *ram_memory;
> -    MemoryRegion *pci_memory;
>      MemoryRegion *rom_memory;
> -    DeviceState *icc_bridge;
> -    FWCfgState *fw_cfg = NULL;
>      PcGuestInfo *guest_info;
>      ram_addr_t lowmem;
>  
> @@ -190,6 +177,20 @@ static void pc_init1(MachineState *machine,
>      } else {
>          gsi = qemu_allocate_irqs(gsi_handler, gsi_state, GSI_NUM_PINS);
>      }
> +}
> +
> +static void pc_machine_pci_bus_init(MachineState *machine,
> +                     int pci_enabled,
> +                     PCII440FXState *i440fx_state,
> +                     int piix3_devfn,
> +                     PCIBus *pci_bus,
> +                     ISABus *isa_bus,
> +                     qemu_irq *gsi,
> +                     MemoryRegion *pci_memory,
> +                     MemoryRegion *ram_memory)
> +{
> +    MemoryRegion *system_memory = get_system_memory();
> +    MemoryRegion *system_io = get_system_io();
>  
>      if (pci_enabled) {
>          pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, &isa_bus, gsi,
> @@ -203,6 +204,28 @@ static void pc_init1(MachineState *machine,
>          isa_bus = isa_bus_new(NULL, system_io);
>          no_hpet = 1;
>      }
> +}
> +
> +static void pc_machine_device_init(MachineState *machine,
> +                     int pci_enabled,
> +                     GSIState *gsi_state,
> +                     DeviceState *icc_bridge,
> +                     int piix3_devfn,
> +                     FWCfgState *fw_cfg,
> +                     PCIBus *pci_bus,
> +                     ISABus *isa_bus,
> +                     qemu_irq *gsi)
> +{
> +    int i;
> +    DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
> +    BusState *idebus[MAX_IDE_BUS];
> +    qemu_irq *smi_irq;
> +    PCMachineState *pc_machine = PC_MACHINE(machine);
> +    qemu_irq *cpu_irq;
> +    qemu_irq *i8259;
> +    ISADevice *rtc_state;
> +    ISADevice *floppy;
> +
>      isa_bus_irqs(isa_bus, gsi);
>  
>      if (kvm_irqchip_in_kernel()) {
> @@ -290,6 +313,30 @@ static void pc_init1(MachineState *machine,
>      }
>  }
>  
> +/* PC hardware initialisation */
> +static void pc_init1(MachineState *machine,
> +                     int pci_enabled,
> +                     int kvmclock_enabled)
> +{
> +    PCIBus *pci_bus = NULL;
> +    ISABus *isa_bus = NULL;
> +    PCII440FXState *i440fx_state = NULL;
> +    int piix3_devfn = -1;
> +    qemu_irq *gsi = NULL;
> +    GSIState *gsi_state = NULL;
> +    MemoryRegion *ram_memory = NULL;
> +    MemoryRegion *pci_memory = NULL;
> +    DeviceState *icc_bridge = NULL;
> +    FWCfgState *fw_cfg = NULL;

These are set to NULL here and never modified below.
Why does it make sense?


> +
> +    pc_machine_base_init(machine, pci_enabled, kvmclock_enabled, icc_bridge,
> +                    ram_memory, pci_memory, gsi, gsi_state, fw_cfg);
> +    pc_machine_pci_bus_init(machine, pci_enabled, i440fx_state, piix3_devfn,
> +                    pci_bus, isa_bus, gsi, pci_memory, ram_memory);
> +    pc_machine_device_init(machine, pci_enabled, gsi_state, icc_bridge,
> +                    piix3_devfn, fw_cfg, pci_bus, isa_bus, gsi);
> +}
> +
>  static void pc_init_pci(MachineState *machine)
>  {
>      pc_init1(machine, 1, 1);
> -- 
> 1.9.1

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