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

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Hi Li,

On 10/8/19 5:04 PM, Li Qiang wrote:
> Philippe Mathieu-Daudé <philmd@redhat.com <mailto: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
>     <mailto: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?

Here I thought about the PPC64 tests inheriting the PPC32 ones, and 
maybe someone update the tests/Makefile.include and this test will run 
on unexpected architectures. So if the machine is NULL (another arch) we 
don't crash and return successfully, so the testsuite continue.

I might add a comment such:

   if (ctx.machine_name) {
       /* Only run whitelisted architecture. */
       ret = g_test_run();
   }

But maybe it is simpler to do at the beginning of main():

   if (g_str_equal(arch, "i386") || g_str_equal(arch, "x86_64")) {
   ...
       ctx.fw_cfg = mm_fw_cfg_init(0xf0000510);
   } else {
       return 0;
   }

What do you think?

Thanks for reviewing the whole series :)

> Thanks,
> Li Qiang
> 
>           g_free(ctx.fw_cfg);
> 
>           return ret;
>     -- 
>     2.21.0
>