Re: [Xen-devel] [PATCH 4/6] arm: add a small kconfig for Renesas RCar H3

[Andrii Anisov <andrii_anisov@xxxxxxxx>]

Hello Stefano,


If we stick with platform specific configuration file:


On 19.04.18 01:15, Stefano Stabellini wrote:
> This is a reference tiny kconfig for Renesas RCar.  In terms of
> schedulers, it selects credit and NULL only.  It enables all the ARM64
> errata.
>
> Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: artem_mygaiev@xxxxxxxx
> CC: volodymyr_babchuk@xxxxxxxx
>
> ---
>
> This patch is untested on Renesas RCar, please test!
I will test it once we are aligned with it.

> Also, I am not sure whether some of the errata workarounds can be
> disabled on the RCar.
> ---
>   xen/arch/arm/configs/renesas.config | 80 +++++++++++++++++++++++++++++++++++++
>   1 file changed, 80 insertions(+)
>   create mode 100644 xen/arch/arm/configs/renesas.config
>
> diff --git a/xen/arch/arm/configs/renesas.config 
> b/xen/arch/arm/configs/renesas.config
Better name it rcar3.config. XEN still supports Renesas R-Car Gen2 which 
is quite different (at least 32-bit).
> new file mode 100644
> index 0000000..7ad3f1c
> --- /dev/null
> +++ b/xen/arch/arm/configs/renesas.config
> @@ -0,0 +1,80 @@
> +#
> +# Automatically generated file; DO NOT EDIT.
> +# Xen/arm 4.11-unstable Configuration
> +#
> +CONFIG_64BIT=y
> +CONFIG_ARM_64=y
> +CONFIG_ARM=y
> +CONFIG_ARCH_DEFCONFIG="arch/arm/configs/arm64_defconfig"
> +
> +#
> +# Architecture Features
> +#
> +CONFIG_NR_CPUS=8
> +# CONFIG_ACPI is not set
> +# CONFIG_HAS_GICV3 is not set
> +# CONFIG_HAS_MEM_ACCESS is not set
> +# CONFIG_NEW_VGIC is not set
> +# CONFIG_SBSA_VUART_CONSOLE is not set
> +
> +#
> +# ARM errata workaround via the alternative framework
> +#
> +CONFIG_ARM64_ERRATUM_827319=y
> +CONFIG_ARM64_ERRATUM_824069=y
> +CONFIG_ARM64_ERRATUM_819472=y
> +CONFIG_ARM64_ERRATUM_832075=y
> +CONFIG_ARM64_ERRATUM_834220=y
> +CONFIG_HARDEN_BRANCH_PREDICTOR=y
> +CONFIG_ARM64_HARDEN_BRANCH_PREDICTOR=y
> +
> +#
> +# Common Features
> +#
> +CONFIG_HAS_ALTERNATIVE=y
> +CONFIG_HAS_DEVICE_TREE=y
> +CONFIG_HAS_PDX=y
> +# CONFIG_TMEM is not set
> +# CONFIG_XSM is not set
> +
> +#
> +# Schedulers
> +#
> +CONFIG_SCHED_CREDIT=y
> +# CONFIG_SCHED_CREDIT2 is not set
> +# CONFIG_SCHED_RTDS is not set
> +# CONFIG_SCHED_ARINC653 is not set
> +CONFIG_SCHED_NULL=y
> +# CONFIG_SCHED_CREDIT_DEFAULT is not set
> +CONFIG_SCHED_NULL_DEFAULT=y
> +CONFIG_SCHED_DEFAULT="null"
> +# CONFIG_LIVEPATCH is not set
> +# CONFIG_SUPPRESS_DUPLICATE_SYMBOL_WARNINGS is not set
> +CONFIG_CMDLINE=""
> +
> +#
> +# Device Drivers
> +#
> +# CONFIG_HAS_NS16550 is not set
> +# CONFIG_HAS_CADENCE_UART is not set
> +# CONFIG_HAS_MVEBU is not set
> +# CONFIG_HAS_PL011 is not set
> +CONFIG_HAS_SCIF=y
> +# CONFIG_HAS_EHCI is not set
> +CONFIG_HAS_PASSTHROUGH=y
IMHO, no passthrough support until IPMMU driver upstreamed.

> +CONFIG_HAS_SMMUv2=y
> +# CONFIG_VIDEO is not set
> +# CONFIG_HAS_ARM_HDLCD is not set
> +CONFIG_DEFCONFIG_LIST="$ARCH_DEFCONFIG"
> +
> +#
> +# Debugging Options
> +#
> +# CONFIG_DEBUG is not set
> +# CONFIG_FRAME_POINTER is not set
> +# CONFIG_COVERAGE is not set
> +# CONFIG_LOCK_PROFILE is not set
> +# CONFIG_PERF_COUNTERS is not set
> +# CONFIG_VERBOSE_DEBUG is not set
> +# CONFIG_DEVICE_TREE_DEBUG is not set
> +# CONFIG_SCRUB_DEBUG is not set
But I would rather embed platform support into Kconfigs. Specifying in a 
configuration file something like CONFIG_RCAR3 and software entities 
like schedulers, livepatching, debug, etc.
--

*Andrii Anisov*



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