Re: [Xen-devel] [RFC v1 7/8] xen: unwrap XEN_BACKEND from XEN_DOM0

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 11 Feb 2015, Luis R. Rodriguez wrote:
> From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>
> 
> This unwraps XEN_BACKEND from depending on XEN_DOM0, it
> instead makes it depend on the possible x86 backends and
> under what scenerios its allowed under ARM. This is as per
> the agreed upon Xen Kconfig changes [0].
> 
> [0] http://comments.gmane.org/gmane.comp.emulators.xen.devel/231579
> 
> Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxx>
> ---
>  arch/x86/xen/Kconfig | 2 ++
>  drivers/xen/Kconfig  | 3 ++-
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
> index 50e2fb4..9298eb3 100644
> --- a/arch/x86/xen/Kconfig
> +++ b/arch/x86/xen/Kconfig
> @@ -16,8 +16,10 @@ config XEN
>  
>  config XEN_DOM0
>       def_bool y
> +     select XEN_BACKEND
>       depends on XEN && PCI_XEN && SWIOTLB_XEN
>       depends on X86_LOCAL_APIC && X86_IO_APIC && ACPI && PCI
> +     depends on XEN_PV || XEN_PVH
>  
>  config XEN_PVHVM
>       def_bool y
> diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
> index 31391bc..d8bd3f6 100644
> --- a/drivers/xen/Kconfig
> +++ b/drivers/xen/Kconfig
> @@ -77,7 +77,8 @@ config XEN_DEV_EVTCHN
>  
>  config XEN_BACKEND
>       bool "Backend driver support"
> -     depends on XEN_DOM0
> +     depends on ARM || ARM64 || (X86 && (XEN_PV || XEN_PVH || XEN_PVHVM))
> +     select SWIOTLB_XEN if ARM || ARM64
>       default y
>       help
>         Support for backend device drivers that provide I/O services

If you do this people could enable XEN_BACKEND without XEN on ARM.
I think it needs to be:

depends on (XEN && (ARM || ARM64)) || (X86 && (XEN_PV || XEN_PVH || XEN_PVHVM))

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