Re: [PATCH v2 7/7] tests/fw_cfg: Run the tests on big-endian targets

[Laszlo Ersek <lersek@redhat.com>]

On 10/08/19 17:04, Li Qiang wrote:
> Philippe Mathieu-Daudé <philmd@redhat.com> 于2019年10月7日周一 下午11:20写道：
> 
>> We have been restricting our fw_cfg tests to the PC machine,
>> which is a little-endian architecture.
>> The fw_cfg device is also used on the SPARC and PowerPC
>> architectures, which can run in big-endian configuration.
>>
>> Since we want to be sure our device does not regress
>> regardless the endianess used, enable this test one
>> these targets.
>>
>> The NUMA selector is X86 specific, restrict it to this arch.
>>
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>> ---
>> v2: test ppc32 too (lvivier)
>> ---
>>  tests/Makefile.include |  2 ++
>>  tests/fw_cfg-test.c    | 33 +++++++++++++++++++++++++++------
>>  2 files changed, 29 insertions(+), 6 deletions(-)
>>
>> diff --git a/tests/Makefile.include b/tests/Makefile.include
>> index 3543451ed3..4ae3d5140a 100644
>> --- a/tests/Makefile.include
>> +++ b/tests/Makefile.include
>> @@ -226,6 +226,7 @@ check-qtest-ppc-y += tests/prom-env-test$(EXESUF)
>>  check-qtest-ppc-y += tests/drive_del-test$(EXESUF)
>>  check-qtest-ppc-y += tests/boot-serial-test$(EXESUF)
>>  check-qtest-ppc-$(CONFIG_M48T59) += tests/m48t59-test$(EXESUF)
>> +check-qtest-ppc-y += tests/fw_cfg-test$(EXESUF)
>>
>>  check-qtest-ppc64-y += $(check-qtest-ppc-y)
>>  check-qtest-ppc64-$(CONFIG_PSERIES) += tests/device-plug-test$(EXESUF)
>> @@ -250,6 +251,7 @@ check-qtest-sh4eb-$(CONFIG_ISA_TESTDEV) =
>> tests/endianness-test$(EXESUF)
>>  check-qtest-sparc-y += tests/prom-env-test$(EXESUF)
>>  check-qtest-sparc-y += tests/m48t59-test$(EXESUF)
>>  check-qtest-sparc-y += tests/boot-serial-test$(EXESUF)
>> +check-qtest-sparc-y += tests/fw_cfg-test$(EXESUF)
>>
>>  check-qtest-sparc64-$(CONFIG_ISA_TESTDEV) = tests/endianness-test$(EXESUF)
>>  check-qtest-sparc64-y += tests/prom-env-test$(EXESUF)
>> diff --git a/tests/fw_cfg-test.c b/tests/fw_cfg-test.c
>> index 35af0de7e6..1250e87097 100644
>> --- a/tests/fw_cfg-test.c
>> +++ b/tests/fw_cfg-test.c
>> @@ -210,13 +210,30 @@ static void test_fw_cfg_splash_time(const void
>> *opaque)
>>
>>  int main(int argc, char **argv)
>>  {
>> -    QTestCtx ctx;
>> -    int ret;
>> +    const char *arch = qtest_get_arch();
>> +    bool has_numa = false;
>> +    QTestCtx ctx = {};
>> +    int ret = 0;
>>
>>      g_test_init(&argc, &argv, NULL);
>>
>> -    ctx.machine_name = "pc";
>> -    ctx.fw_cfg = pc_fw_cfg_init();
>> +    if (g_str_equal(arch, "i386") || g_str_equal(arch, "x86_64")) {
>> +        has_numa = true;
>> +        ctx.machine_name = "pc";
>> +        ctx.fw_cfg = pc_fw_cfg_init();
>> +    } else if (g_str_equal(arch, "sparc")) {
>> +        ctx.machine_name = "SS-5";
>> +        ctx.fw_cfg = mm_fw_cfg_init(0xd00000510ULL);
>> +    } else if (g_str_equal(arch, "ppc") || g_str_equal(arch, "ppc64")) {
>> +        /*
>> +         * The mac99 machine is different for 32/64-bit target:
>> +         *
>> +         * ppc(32): the G4 which can be either little or big endian,
>> +         * ppc64:   the G5 (970FX) is only big-endian.
>> +         */
>> +        ctx.machine_name = "mac99";
>> +        ctx.fw_cfg = mm_fw_cfg_init(0xf0000510);
>> +    }
>>
>>      qtest_add_data_func("fw_cfg/signature", &ctx, test_fw_cfg_signature);
>>      qtest_add_data_func("fw_cfg/id", &ctx, test_fw_cfg_id);
>> @@ -231,14 +248,18 @@ int main(int argc, char **argv)
>>      qtest_add_func("fw_cfg/boot_device", test_fw_cfg_boot_device);
>>  #endif
>>      qtest_add_data_func("fw_cfg/max_cpus", &ctx, test_fw_cfg_max_cpus);
>> -    qtest_add_data_func("fw_cfg/numa", &ctx, test_fw_cfg_numa);
>>      qtest_add_data_func("fw_cfg/boot_menu", &ctx, test_fw_cfg_boot_menu);
>>      qtest_add_data_func("fw_cfg/reboot_timeout", &ctx,
>>                          test_fw_cfg_reboot_timeout);
>>      qtest_add_data_func("fw_cfg/splash_time", &ctx,
>> test_fw_cfg_splash_time);
>>
>> -    ret = g_test_run();
>> +    if (has_numa) {
>> +        qtest_add_data_func("fw_cfg/numa", &ctx, test_fw_cfg_numa);
>> +    }
>>
>> +    if (ctx.machine_name) {
>> +        ret = g_test_run();
>> +    }
>>
> 
> I think we can omit this if statement. In which case the ctx.machine_name
> will be NULL?

When "arch" differs from all of i386, x86_64, sparc, ppc, ppc64.

In that case, the original initializer will remain in effect, from:

  QTestCtx ctx = {};

(Admittedly, this is an ugly GNU-ism; for standard C, it should be

  QTestCtx ctx = { 0 };

but the GNU-ism is used quite frequently in QEMU elsewhere, so meh :) )

Thanks
Laszlo