Re: [Xen-devel] [PATCH-for-5.0 v3 6/6] hw/pci-host: Add Kconfig entry to select the IGD Passthrough Host Bridge

["Durrant, Paul" <pdurrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of
> Philippe Mathieu-Daudé
> Sent: 09 December 2019 09:50
> To: qemu-devel@xxxxxxxxxx
> Cc: Thomas Huth <thuth@xxxxxxxxxx>; Stefano Stabellini
> <sstabellini@xxxxxxxxxx>; Michael S. Tsirkin <mst@xxxxxxxxxx>; Paul
> Durrant <paul@xxxxxxx>; Markus Armbruster <armbru@xxxxxxxxxx>; Alex
> Williamson <alex.williamson@xxxxxxxxxx>; Marcel Apfelbaum
> <marcel.apfelbaum@xxxxxxxxx>; Paolo Bonzini <pbonzini@xxxxxxxxxx>; Anthony
> Perard <anthony.perard@xxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx;
> Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
> Subject: [Xen-devel] [PATCH-for-5.0 v3 6/6] hw/pci-host: Add Kconfig entry
> to select the IGD Passthrough Host Bridge
> 
> Add the XEN_IGD_PASSTHROUGH Kconfig option.
> 
> Xen build has that option selected by default. Non-Xen builds now
> have to select this feature manually.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
> ---
> v3: Only default with Xen (Alex Williamson)
> 
> I did not used 'depends on XEN' as suggested by Alex but
> 'default y if XEN', so one can build XEN without this feature
> (for example, on other ARCH than X86).

Allowing it to be compiled out for Xen builds is quite reasonable IMO. I don't 
believe it is widely used.

Acked-by: Paul Durrant <paul@xxxxxxx>

> ---
>  hw/pci-host/Kconfig       | 5 +++++
>  hw/pci-host/Makefile.objs | 2 +-
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/pci-host/Kconfig b/hw/pci-host/Kconfig
> index b0aa8351c4..24ba8ea046 100644
> --- a/hw/pci-host/Kconfig
> +++ b/hw/pci-host/Kconfig
> @@ -1,6 +1,11 @@
>  config PAM
>      bool
> 
> +config XEN_IGD_PASSTHROUGH
> +    bool
> +    default y if XEN
> +    select PCI_I440FX
> +
>  config PREP_PCI
>      bool
>      select PCI
> diff --git a/hw/pci-host/Makefile.objs b/hw/pci-host/Makefile.objs
> index fa6d1556c0..9c466fab01 100644
> --- a/hw/pci-host/Makefile.objs
> +++ b/hw/pci-host/Makefile.objs
> @@ -14,7 +14,7 @@ common-obj-$(CONFIG_VERSATILE_PCI) += versatile.o
>  common-obj-$(CONFIG_PCI_SABRE) += sabre.o
>  common-obj-$(CONFIG_FULONG) += bonito.o
>  common-obj-$(CONFIG_PCI_I440FX) += i440fx.o
> -common-obj-$(CONFIG_PCI_I440FX) += xen_igd_pt.o
> +common-obj-$(CONFIG_XEN_IGD_PASSTHROUGH) += xen_igd_pt.o
>  common-obj-$(CONFIG_PCI_EXPRESS_Q35) += q35.o
>  common-obj-$(CONFIG_PCI_EXPRESS_GENERIC_BRIDGE) += gpex.o
>  common-obj-$(CONFIG_PCI_EXPRESS_XILINX) += xilinx-pcie.o
> --
> 2.21.0
> 
> 
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