Re: [Xen-devel] [PATCH] Add a property to disable the floppy controller

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

On 14/05/2015 16:41, Stefano Stabellini wrote:
> Do not change default settings for any machines at the moment: this
> patch does not introduce any changes in behavior unless the user asks
> for no-fdc=on.

Can we avoid the double negative?

Paolo

> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> ---
>  hw/i386/pc.c         |   27 ++++++++++++++++++++++++---
>  include/hw/i386/pc.h |    2 ++
>  vl.c                 |    4 ++++
>  3 files changed, 30 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index f31d55e..501609b 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1450,10 +1450,14 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq 
> *gsi,
>      cpu_exit_irq = qemu_allocate_irqs(cpu_request_exit, NULL, 1);
>      DMA_init(0, cpu_exit_irq);
>  
> -    for(i = 0; i < MAX_FD; i++) {
> -        fd[i] = drive_get(IF_FLOPPY, 0, i);
> +    *floppy = NULL;
> +    if (!object_property_get_bool(qdev_get_machine(),
> +                PC_MACHINE_NO_FDC, &error_abort)) {
> +        for (i = 0; i < MAX_FD; i++) {
> +            fd[i] = drive_get(IF_FLOPPY, 0, i);
> +        }
> +        *floppy = fdctrl_init_isa(isa_bus, fd);
>      }
> -    *floppy = fdctrl_init_isa(isa_bus, fd);
>  }
>  
>  void pc_nic_init(ISABus *isa_bus, PCIBus *pci_bus)
> @@ -1797,6 +1801,20 @@ static bool pc_machine_get_aligned_dimm(Object *obj, 
> Error **errp)
>      return pcms->enforce_aligned_dimm;
>  }
>  
> +static bool pc_machine_get_no_fdc(Object *obj, Error **errp)
> +{
> +    PCMachineState *pcms = PC_MACHINE(obj);
> +
> +    return pcms->no_fdc;
> +}
> +
> +static void pc_machine_set_no_fdc(Object *obj, bool value, Error **errp)
> +{
> +    PCMachineState *pcms = PC_MACHINE(obj);
> +
> +    pcms->no_fdc = value;
> +}
> +
>  static void pc_machine_initfn(Object *obj)
>  {
>      PCMachineState *pcms = PC_MACHINE(obj);
> @@ -1820,6 +1838,9 @@ static void pc_machine_initfn(Object *obj)
>      object_property_add_bool(obj, PC_MACHINE_ENFORCE_ALIGNED_DIMM,
>                               pc_machine_get_aligned_dimm,
>                               NULL, NULL);
> +    object_property_add_bool(obj, PC_MACHINE_NO_FDC,
> +                             pc_machine_get_no_fdc, pc_machine_set_no_fdc,
> +                             NULL);
>  }
>  
>  static void pc_machine_class_init(ObjectClass *oc, void *data)
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index 69d9cf8..93b2442 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -41,6 +41,7 @@ struct PCMachineState {
>      uint64_t max_ram_below_4g;
>      OnOffAuto vmport;
>      bool enforce_aligned_dimm;
> +    bool no_fdc;
>  };
>  
>  #define PC_MACHINE_ACPI_DEVICE_PROP "acpi-device"
> @@ -48,6 +49,7 @@ struct PCMachineState {
>  #define PC_MACHINE_MAX_RAM_BELOW_4G "max-ram-below-4g"
>  #define PC_MACHINE_VMPORT           "vmport"
>  #define PC_MACHINE_ENFORCE_ALIGNED_DIMM "enforce-aligned-dimm"
> +#define PC_MACHINE_NO_FDC "no-fdc"
>  
>  /**
>   * PCMachineClass:
> diff --git a/vl.c b/vl.c
> index 91411c1..81d80ae 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -387,6 +387,10 @@ static QemuOptsList qemu_machine_opts = {
>              .name = "iommu",
>              .type = QEMU_OPT_BOOL,
>              .help = "Set on/off to enable/disable Intel IOMMU (VT-d)",
> +        },{
> +            .name = PC_MACHINE_NO_FDC,
> +            .type = QEMU_OPT_BOOL,
> +            .help = "do not emulate a floppy controller",
>          },
>          { /* End of list */ }
>      },
> 

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