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

[Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>]

Hello, Juergen!

On 03.09.21 13:26, Juergen Gross wrote:
> 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)?

Yes, you are right. I have to revert the logic, e.g. s/ifndef/ifdef

Other than that, are you ok with CONFIG_PCI_SUPP_LEGACY_IRQ name?

Thank you and sorry for the noise,

Oleksandr

>
>
> Juergen