Re: [Xen-devel] [PATCH v3a 39/39] ARM: VGIC: wire new VGIC(-v2) files into Xen build system

[Stefano Stabellini <stefano@xxxxxxxxxxx>]

On Thu, 22 Mar 2018, Andre Przywara wrote:
> Now that we have both the old VGIC prepared to cope with a sibling and
> the code for the new VGIC in place, lets add a Kconfig option to enable
> the new code and wire it into the Xen build system.
> This will add a compile time option to use either the "old" or the "new"
> VGIC.
> In the moment this is restricted to a vGIC-v2. To make the build system
> happy, we provide a temporary dummy implementation of
> vgic_v3_setup_hw() to allow building for now.
> 
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx>

Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
> Changelog v3 ... v3a:
> - print panic when trying to run on GICv3 hardware
> 
> Changelog v2 ... v3:
> - fix indentation of Kconfig entry
> - select NEEDS_LIST_SORT
> - drop unconditional list_sort.o inclusion
> 
> Changelog v1 ... v2:
> - add Kconfig help text
> - use separate Makefile in vgic/ directory
> - protect compilation without GICV3 support
> - always include list_sort() in build
> 
>  xen/arch/arm/Kconfig       | 18 +++++++++++++++++-
>  xen/arch/arm/Makefile      |  5 ++++-
>  xen/arch/arm/vgic/Makefile |  5 +++++
>  xen/arch/arm/vgic/vgic.c   | 11 +++++++++++
>  4 files changed, 37 insertions(+), 2 deletions(-)
>  create mode 100644 xen/arch/arm/vgic/Makefile
> 
> diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
> index 2782ee6589..8174c0c635 100644
> --- a/xen/arch/arm/Kconfig
> +++ b/xen/arch/arm/Kconfig
> @@ -48,7 +48,23 @@ config HAS_GICV3
>  config HAS_ITS
>          bool
>          prompt "GICv3 ITS MSI controller support" if EXPERT = "y"
> -        depends on HAS_GICV3
> +        depends on HAS_GICV3 && !NEW_VGIC
> +
> +config NEW_VGIC
> +     bool
> +     prompt "Use new VGIC implementation"
> +     select NEEDS_LIST_SORT
> +     ---help---
> +
> +     This is an alternative implementation of the ARM GIC interrupt
> +     controller emulation, based on the Linux/KVM VGIC. It has a better
> +     design and fixes many shortcomings of the existing GIC emulation in
> +     Xen. It will eventually replace the existing/old VGIC.
> +     However at the moment it lacks support for Dom0 using the ITS for
> +     using MSIs.
> +     Say Y if you want to help testing this new code or if you experience
> +     problems with the standard emulation.
> +     At the moment this implementation is not security supported.
>  
>  config SBSA_VUART_CONSOLE
>       bool "Emulated SBSA UART console support"
> diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
> index 41d7366527..a9533b107e 100644
> --- a/xen/arch/arm/Makefile
> +++ b/xen/arch/arm/Makefile
> @@ -16,7 +16,6 @@ obj-y += domain_build.o
>  obj-y += domctl.o
>  obj-$(EARLY_PRINTK) += early_printk.o
>  obj-y += gic.o
> -obj-y += gic-vgic.o
>  obj-y += gic-v2.o
>  obj-$(CONFIG_HAS_GICV3) += gic-v3.o
>  obj-$(CONFIG_HAS_ITS) += gic-v3-its.o
> @@ -47,10 +46,14 @@ obj-y += sysctl.o
>  obj-y += time.o
>  obj-y += traps.o
>  obj-y += vcpreg.o
> +subdir-$(CONFIG_NEW_VGIC) += vgic
> +ifneq ($(CONFIG_NEW_VGIC),y)
> +obj-y += gic-vgic.o
>  obj-y += vgic.o
>  obj-y += vgic-v2.o
>  obj-$(CONFIG_HAS_GICV3) += vgic-v3.o
>  obj-$(CONFIG_HAS_ITS) += vgic-v3-its.o
> +endif
>  obj-y += vm_event.o
>  obj-y += vtimer.o
>  obj-$(CONFIG_SBSA_VUART_CONSOLE) += vpl011.o
> diff --git a/xen/arch/arm/vgic/Makefile b/xen/arch/arm/vgic/Makefile
> new file mode 100644
> index 0000000000..806826948e
> --- /dev/null
> +++ b/xen/arch/arm/vgic/Makefile
> @@ -0,0 +1,5 @@
> +obj-y += vgic.o
> +obj-y += vgic-v2.o
> +obj-y += vgic-mmio.o
> +obj-y += vgic-mmio-v2.o
> +obj-y += vgic-init.o
> diff --git a/xen/arch/arm/vgic/vgic.c b/xen/arch/arm/vgic/vgic.c
> index f9a5088285..ac18cab6f3 100644
> --- a/xen/arch/arm/vgic/vgic.c
> +++ b/xen/arch/arm/vgic/vgic.c
> @@ -981,6 +981,17 @@ unsigned int vgic_max_vcpus(const struct domain *d)
>      return min_t(unsigned int, MAX_VIRT_CPUS, vgic_vcpu_limit);
>  }
>  
> +#ifdef CONFIG_HAS_GICV3
> +/* Dummy implementation to allow building without actual vGICv3 support. */
> +void vgic_v3_setup_hw(paddr_t dbase,
> +                      unsigned int nr_rdist_regions,
> +                      const struct rdist_region *regions,
> +                      unsigned int intid_bits)
> +{
> +    panic("New VGIC implementation does not yet support GICv3.");
> +}
> +#endif
> +
>  /*
>   * Local variables:
>   * mode: C
> -- 
> 2.14.1
> 

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