Re: [PATCH 08/11] libxl: Only map legacy PCI IRQs if they are supported

[Juergen Gross <jgross@xxxxxxxx>]

On 03.09.21 10:33, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
>
> Arm's PCI passthrough implementation doesn't support legacy interrupts,
> but MSI/MSI-X. This can be the case for other platforms too.
> For that reason introduce a new CONFIG_PCI_SUPP_LEGACY_IRQ and add
> it to the CFLAGS and compile the relevant code in the toolstack only if
> applicable.
>
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> Cc: Ian Jackson <iwj@xxxxxxxxxxxxxx>
> Cc: Juergen Gross <jgross@xxxxxxxx>
> ---
>   tools/libs/light/Makefile    |  4 ++++
>   tools/libs/light/libxl_pci.c | 13 +++++++++++++
>   2 files changed, 17 insertions(+)
>
> diff --git a/tools/libs/light/Makefile b/tools/libs/light/Makefile
> index 7d8c51d49242..bd3f6be2a183 100644
> --- a/tools/libs/light/Makefile
> +++ b/tools/libs/light/Makefile
> @@ -46,6 +46,10 @@ CFLAGS += -Wno-format-zero-length -Wmissing-declarations \
>         -Wno-declaration-after-statement -Wformat-nonliteral
>   CFLAGS += -I.
>   
> +ifeq ($(CONFIG_X86),y)
> +CFLAGS += -DCONFIG_PCI_SUPP_LEGACY_IRQ
> +endif
> +
>   SRCS-$(CONFIG_X86) += libxl_cpuid.c
>   SRCS-$(CONFIG_X86) += libxl_x86.c
>   SRCS-$(CONFIG_X86) += libxl_psr.c
> diff --git a/tools/libs/light/libxl_pci.c b/tools/libs/light/libxl_pci.c
> index 59f3686fc85e..cd4fea46c3f7 100644
> --- a/tools/libs/light/libxl_pci.c
> +++ b/tools/libs/light/libxl_pci.c
> @@ -1434,6 +1434,7 @@ static void pci_add_dm_done(libxl__egc *egc,
>           }
>       }
>       fclose(f);
> +#ifndef CONFIG_PCI_SUPP_LEGACY_IRQ
Why #ifndef? Shouldn't this be #ifdef (same below multiple times)?


Juergen

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