Re: [RFC PATCH 3/4] hw/xen/Kconfig: Introduce XEN_PV config

[Paolo Bonzini <pbonzini@redhat.com>]

On 29/01/21 20:44, Philippe Mathieu-Daudé wrote:
> xenpv machine requires USB, IDE_PIIX and PCI:
> 
>    /usr/bin/ld:
>    libcommon.fa.p/hw_xen_xen-legacy-backend.c.o: in function `xen_be_register_common':
>    hw/xen/xen-legacy-backend.c:757: undefined reference to `xen_usb_ops'
>    libqemu-i386-softmmu.fa.p/hw_i386_xen_xen_platform.c.o: in function `unplug_disks':
>    hw/i386/xen/xen_platform.c:153: undefined reference to `pci_piix3_xen_ide_unplug'
>    libqemu-i386-softmmu.fa.p/hw_i386_xen_xen_platform.c.o: in function `pci_unplug_nics':
>    hw/i386/xen/xen_platform.c:137: undefined reference to `pci_for_each_device'
>    libqemu-i386-softmmu.fa.p/hw_i386_xen_xen_platform.c.o: in function `xen_platform_realize':
>    hw/i386/xen/xen_platform.c:483: undefined reference to `pci_register_bar'
> 
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>   hw/Kconfig     | 1 +
>   hw/xen/Kconfig | 6 ++++++
>   2 files changed, 7 insertions(+)
>   create mode 100644 hw/xen/Kconfig
> 
> diff --git a/hw/Kconfig b/hw/Kconfig
> index 5ad3c6b5a4b..f2a95591d94 100644
> --- a/hw/Kconfig
> +++ b/hw/Kconfig
> @@ -39,6 +39,7 @@ source usb/Kconfig
>   source virtio/Kconfig
>   source vfio/Kconfig
>   source watchdog/Kconfig
> +source xen/Kconfig
>   
>   # arch Kconfig
>   source arm/Kconfig
> diff --git a/hw/xen/Kconfig b/hw/xen/Kconfig
> new file mode 100644
> index 00000000000..15944144a17
> --- /dev/null
> +++ b/hw/xen/Kconfig
> @@ -0,0 +1,6 @@
> +config XEN_PV
> +    bool
> +    depends on XEN
> +    select PCI
> +    select USB
> +    select IDE_PIIX
> 

Since you're hacking around you can also "select ISA_BUS" here, but the 
right solution would be to have a "config XEN_FV" and leave 
hw/i386/xen/xen_platform.c out of XEN_PV.

Paolo